Tektronix 2445 Instruction Manual Download Page 167

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Maintenance— 2445 Service

13.

Slide the crt forward slightly by gently pushing on the

rear of the crt neck until the front of the crt can be grasped.

14.

Slide the crt out of the instrument while feeding the

anode lead and Y-Axis Alignment coil leads through their

respective holes.

N O T E

O nce the c rt is rem oved, it should b e sto red in such a

m anner as to p ro te c t it from im p a c t If sto red face

dow n, it should b e p laced on a soft, nonabrasive sur

face to p reven t the c rt face p la te from being

scratched. To reinstall the crt, perform the reverse o f

the preceding instructions.

Summary of Contents for 2445

Page 1: ...Tektronix 2445 OSCILLOSCOPE SERVICE INSTRUCTION MANUAL ...

Page 2: ...D IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO REFER TO OPERATORS SAFETY SUMMARY AND SERVICE SAFETY SUMMARY PRIOR TO PERFORMING ANY SERVICE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL 2445 OSCILLOSCOPE SERVICE INSTRUCTION MANUAL Tektronix Inc P O Box 500 Beaverton Oregon 97077 SerialNumber_____________________ 070 3829 00 Product Group 38 First Printing JAN 1983 ...

Page 3: ...sion of Tektronix Inc Products of Tektronix Inc and its subsidiaries are covered by U S and foreign patents and or pending patents TEKTRONIX TEK SCOPE MOBILE and are registered trademarks of Tektronix Inc TELEQUIPMENT is a registered trademark of Tektronix U K Limited Printed in U S A Specification and price change privileges are reserved ...

Page 4: ...G 2 2 START UP 2 2 REPACKAGING FOR SHIPMENT 2 2 CONTROLS CONNECTORS AND INDICATORS 2 4 POWER AND DISPLAY 2 4 VE R TICA L 2 5 HORIZONTAL AND DELTA MEASUREMENT 2 7 TRIGGER 2 10 REAR PAN EL 2 12 READOUT D ISP LA Y 2 13 OPERATING CONSIDERATIONS 2 15 GRATICULE 2 15 TIME AND VOLTAGE MEASUREMENTS 2 15 GROUNDING 2 15 SIGNAL CONNECTIONS 2 16 INPUT COUPLING CAPACITOR PRECHARGING 2 16 EXTERNALTRIGGERING 2 16...

Page 5: ...RIZO NTAL 5 9 CAL 02 VER TIC AL 5 12 CAL 03 TRIGGERING 5 14 CAL 04 CH 2 DELAY ENABLE DiSABLE 5 15 Page DYNAMIC CENTERING CRT TERMINATION VERTICAL GAIN VERTICAL CENTERING TRANSIENT RESPONSE HF ADJ READOUT JITTER DC BALANCE AND X Y PHASE DIFFERENTIAL ADJUSTMENTS 5 16 SECTION 6 MAINTENANCE STATIC SENSITIVE COMPONENTS 6 1 PREVENTIVE MAINTENANCE 6 2 INTRODUCTION 6 2 GENERAL CARE 6 2 INSPECTION AND CLEA...

Page 6: ...SECTION 7 OPTIONS INTRODUCTION OPTION 2 2 OPTION 1R POWER CORD OPTIONS FUTURE OPTIONS Page SECTION 8 REPLACEABLE ELECTRICAL PARTS SECTION 9 DIAGRAMS 7 1 71 SECTION 10 REPLACEABLE MECHANICAL PARTS 71 ACCESSORIES 7 1 7 2 CHANGE INFORMATION ...

Page 7: ...llumination c irc u it 3 17 3 6 Sweep generator 3 22 3 7 Developing the readout d isp lay 3 28 3 8 Readout display priorities 3 32 3 9 Timing of Refresh Prioritizer 3 33 3 10 Dc Restorer c irc u it 3 38 3 11 Timing relationships of the Inverter Drive signals 3 41 3 12 Simplified schematic of control netw ork 3 42 6 1 Multipin connector orientation 6 6 6 2 Rear panel removal 6 23 6 3 Ribbon cable r...

Page 8: ...tings for A and B Timing Accuracy Checks and A Cursor Accuracy Lim its 4 20 4 7 Horizontal Timing Accuracy Checked Against the G raticule 4 21 4 8 Delta Time Display Accuracy 4 22 4 9 Delayed Sweep Delta Time Accuracy 4 23 5 1 Power Supply Voltage and Ripple Tolerances 5 3 5 2 Horizontal Timing 5 11 5 3 Horizontal Timing 5 12 5 4 Vertical Calibration Signals 5 13 5 5 Vertical Calibration Signals 5...

Page 9: ... all acces sible conductive parts including knobs and controls that may appear to be insulating can render an electric shock Symbols in This Manual This symbol indicates where applicable A cautionary or other information is to be found For maximum input voltage see Table 1 1 Symbols as Marked on Equipment DANGER High voltage Protective ground earth terminal ATTENTION Refer to manual Power Source T...

Page 10: ...gerous voltages exist at several points in this product To avoid personal injury do not touch exposed connec tions or components while power is on Disconnect power before removing protective panels soldering or replacing components Power Source This product is intended to operate from a power source that does not apply more than 250 volts rms between the supply conductors or between either supply ...

Page 11: ...2445 Service 3829 01 The 2445 Oscilloscope ...

Page 12: ...hipped with the following standard accessories 2 Probe packages 1 Snap lock accessories pouch 1 Zip lock accessories pouch 1 Operators manual 1 Service manual 1 Power cord instaiied 1 2 A 250 V fuse 1 Clear plastic crt filter 1 Blue plastic crt filter installed 1 Front panel cover 1 Operators pocket reference guide For part numbers and further information about both standard and optional accessori...

Page 13: ...y variable between VOLTS DIV switch settings Extends deflection factor of the 5 V per division setting to at least 12 5 V per division Frequency Response 3 dB bandwidth Six division reference signal from a terminated 50 2 system with VAR VOLTS DIV control in calibrated detent VOLTS DIV setting With standard accessory probe or internal 50 S2 termination With 50 2 external termination on 1 M 2 input...

Page 14: ... Input R and C 1 MH Resistance 1 M 2 0 5 a Capacitance 15 pF 2 pF a Maximum Input Voltage 400 V dc peak ac 800 V p p ac at 10 kHz or less 3 Input R 50 2 Resistance 50 f2 1 a VSWR DC to 150 MHz 1 3 1 or less 3 Maximum Input Voltage 5 V rms 0 5 W seconds during any 1 s interval for instantaneous voltage from 5 V to 50 V Cascaded Operation CH 2 SIGNAL OUT into Channel 1 input DC coupled using a 50 2 ...

Page 15: ...through the selected channels at the chop switching rate If the B SEC DIV switch is set to sweep speeds outside the range of 20 ts per division to 2 jus per division the switching rate is 1 MHz 0 2 dual channel cycle rate of 500 kHz If the B SEC DIV switch is set within the range of 20 is I per division to 2 is per division the switching rate is 2 5 MHz 0 2 dual channel cycle rate of 1 25 MHz At a...

Page 16: ...e 9 times the VOLTS DIV switch setting 3 LEVEL Control Readout Accuracy for triggering signals with transition times greater than 20 ns Channel 1 or Channel 2 Source DC Coupled 15 C to 35 C Within 3 of setting 3 of p p signal 0 2 division 0 5 mV x probe attenuation factor 15 C to 55 C excluding 15 Cto 35 C Add 1 5 mV x probe attenuation factor to the specification listed for 15 C to 35 C a NOISE R...

Page 17: ... Extends slowest A Sweep speed to 1 5 s per division Operates in conjunction with the A SEC DIV switch when A and B are locked together operates in conjunction with the B SEC DIV switch when A and B are not locked together Timing Accuracy 15 Cto 35 C SEC DIV switch set to 0 1 s per division or less A and B Sweep Accuracy Time Intervals Measured at Vertical Center with SEC DIV VAR Control in Detent...

Page 18: ... 100 ps Delay Time Position Range 0 to 9 95 times the A SEC DIV switch setting Main sweep triggering event is observable on delayed sweep with zero delay setting 3 X Y Operation X Axis Deflection Factor Range Same as Channel 1 8 Accuracy Same as Channel 1 Variable Range Same as Channel I 8 X Axis Bandwidth Dc to 3 MHz Input R and C Same as Channel I 8 Phase Difference Between X and Y with Normal B...

Page 19: ...ition Period Two times the A SEC DIV switch setting within the range of 200 ns to 200 ms Accuracy 0 1 during sweep time Symmetry Duration of high portion of output cycle is 50 of output period lesser of 500 ns or 25 of period 3 Jitter of Pulse Period or Pulse Width 10 ns or less 3 CH 2 SIGNAL OUT Output Voltage 20 mV per division 10 into 1 M 2 10 mV per division 10 into 50 2 Offset 5 mV into 50 2 ...

Page 20: ...rce Frequency 48 Hz to 440 Hz a Fuse Rating 2 A 250 V AGC 3AG Fast blow or 1 6 A 250 V 5 x 20 mm Quick acting F a Power Consumption Typical 70 W 140 VA a Maximum 120 W 180 VA a Primary Circuit Dielectric Voltage Withstand Test 1500 V rms 60 Hz for 10 s without breakdown 3 Primary Grounding Type test to 0 1 2 maximum Routine test to check grounding continuity between chassis ground and protective e...

Page 21: ... Hz 75 minutes total test time Shock operating and nonoperating 50 g half sine 11 ms duration three shocks on each face for a total of 18 shocks Transit Drop not in shipping package 12 inch drop on each corner and each face MIL T 28800C paragraph 3 9 5 2 and 4 5 5 4 2 Bench Handling with and without cabinet installed MIL STD 810C Method 512 2 Procedure V MIL T 28800C paragraph 4 5 5 4 3 EMI electr...

Page 22: ...g 28 2 lb Height With Feet and Accessories Pouch 190 mm 7 5 in Without Accessories Pouch 160 mm 6 3 in Width with handle 330 mm 13 0 in Depth With Front Panel Cover 434 mm 17 1 in With Handle Extended 505 mm 19 9 in Cooling Forced air circulation Finish Tektronix Blue vinyl clad material on aluminum cabinet Construction Aluminum alloy chassis sheet metal Plastic laminate front panel Glass laminate...

Page 23: ...the correct nominal ac source voltage setting see Table 2 1 The detachable power cord may have to be changed to match the particular power source output LINE FUSE To verify that the instrument power input fuse is of proper value for the nominal ac source voltage selected perform the following procedure 1 Press in the fuse holder cap and release it with a slight counterclockwise rotation 2 Pull the...

Page 24: ... of the failed test If a failure of any power up test occurs the instrument may still be usable for some applications To put the instrument into the operating mode after a power up test failure press the A B TRIG button If the instrument then functions for your particular measurement requirement it may be used but refer it to a qualified service technician for repair of the problem at the earliest...

Page 25: ...ce Standards1 3 U S Domestic Standard U S 120V 15A 115V 90V to 132V 2A 250V AGC 3AG Fast blow UL 198 6 AG C 3AG ANSI C73 11 NEMA 5 1 5 P IEC 83 UL 198 6 Option A1 EURO 240V 10 16A 230V 180V to 250V 1 6A 250V 5x20 mm Quick Acting F IEC 127 5x20 mm CEE 7 II IV VII IEC 83 IEC 127 Option A2 UKa 240V 6A 230V 180V to 250V 1 6A 250V 5x20 mm Quick Acting F IEC 127 5 2 0 mm BS 1363 IEC 83 IEC 127 Option A3...

Page 26: ...y to minimum Clockwise rotation from midrange increases the readout intensity and enables the scale factor display counterclockwise rotation from midrange also increases the intensity but disables the scale factor display Delta Volts and Delta Time readouts and control messages will continue to be enabled even when the scale factor display is disabled ASTIG Control Operator adjusted screwdriver co...

Page 27: ...nput coupling capacitor to prevent a sudden shift of the trace if AC input coupling is selected later 1 M12 DC All frequency components of the input signal are coupled to the vertical attenuator Input resistance is 1 M12 to ground 1 M12 GND In this position the switch operates exactly the same as previously described 50 12 DC All frequency components of the input signal are coupled to the vertical...

Page 28: ...MHz depending on the SEC DIV switch setting At all sweep speeds the chop switching rate is desynchronized with the sweep frequency to minimize waveform breaks when viewing repetitive signals OUT ALT released out When more than one channel is selected the vertical display switches sequentially through the selected channels Alter nate switching occurs during sweep retrace times If both A and B Sweep...

Page 29: ...g equipment under test and the oscilloscope Hookup is made via a banana tip connector HORIZONTAL AND DELTA MEASUREMENT Refer to Figure 2 5 for location of items 23 through 33 23 A SEC DIV Switch Selects 25 calibrated A Sweep speeds from 1 s per division to 10 ns per division or delay ranges from 10 s to 200 ns in a 1 2 5 sequence Extreme counterclockwise switch rotation selects the X Y display mod...

Page 30: ...clock wise rotation detent position produces the sweep speed indicated by the position of the SEC DIV switches The crt readout displays the actual time per division scale factor for all settings of the VAR control This control produces fine resolution over a portion of its range after which it changes to coarse reso lution It reenters the fine resolution range upon reversing the direction of rotat...

Page 31: ... button cancels the function When the A and B SEC DIV knobs are locked together A trace only two vertical cursors are superimposed on the crt display while the Delta Time function is active In any of the delay time Horizontal Display modes PULL INTEN TURN ALT or PUSH B two separate delay times are established by the Delta Time function One cursor position or delay time is set by the A REF OR DLY P...

Page 32: ...ected Horizontal Display Mode and as directed by the A B TRIG switch A Trigger Modes AUTO LVL Automatically establishes the trigger level on a triggering signal and free runs the sweep in the absence of a triggering signal The LEVEL control covers a range between the positive and negative peaks of repetitive triggering signals If the triggering signal amplitude changes the trigger level does not c...

Page 33: ...oth the Trigger MODE in use and position of the CHOP ALT button affect the trigger source selection When ALT VERTICAL MODE is selected each displayed channel in turn provides the triggering signal and the respective LED indicator for each displayed channel is illuminated except in the case of AUTO LVL MODE triggering For AUTO LVL triggering or CHOP VERTICAL MODE the lowest numbered channel or ADD ...

Page 34: ...ODE is set to TRIG AFT DLY How ever if the B TRIGGER MODE is set to RUN AFT DLY when the B SEC DIV knob is unlocked from the A SEC DIV knob the trigger controls remain directed to the A Trigger until the B Trigger is reselected by the A B TRIG switch 38 LEVEL Control Sets the amplitude point on the triggering signal at which either A or B Sweep trig gering occurs This control produces fine resolut...

Page 35: ...the most abrupt intensity changes External Z axis signals must be time related to the displayed signal frequency to obtain a stable intensity modulation pattern on the crt 46 Fuse Holder Contains the ac power source fuse 4 7 Detachable Power Cord Receptacle Provides the connection point for the ac power source to the instrument 48 LINE VOLTAGE SELECTOR Switch Selects the nominal instrument operati...

Page 36: ...tip of encoded probes that will initiate the sweep The readout appears only if the following con ditions exist a single vertical channel is selected as the trigger source the vertical input coupling is not AC the VOLTS DIV VAR control of the source channel is in the calibrated detent and trigger coupling is either DC or NOISE REJ A question mark may appear in a DLY delay time a At delta time or a ...

Page 37: ...e least accurate measurement values This method should be used only for measuring very low repetition rate signals or for single shot measurements which require a photograph for viewing The At and AV cursors provide for better accuracy and easier operation than using the graticule and they should be used in most measurement situations Use of the cursors avoids vertical and horizontal gain errors a...

Page 38: ...ables Cables may also be used to connect signals to the input connectors but they may have considerable effect on the accuracy of a displayed waveform To maintain the original quality low loss coaxial cables should be used Coaxial cables should be terminated at both ends in their char acteristic impedance If this is not possible use suitable impedance matching devices INPUT COUPLING CAPACITOR PREC...

Page 39: ...3 Adjust the INTENSITY and READOUT INTENSITY controls for desired display and readout brightness and best trace definition 4 Adjust the Vertical and Horizontal POSITION controls to position the trace within the graticule area INITIAL SETUP 1 Press in the POWER switch button ON and allow the instrument to warm up 20 minutes is recommended for maximum accuracy TRACE ROTATION ADJUSTMENT 1 Preset inst...

Page 40: ... small bladed screwdriver to adjust the ASTIG control see Figure 2 2 NOTE If a circuit defect prevents accurate dc balance the routine halts and LIMIT is displayed Push the Trigger COUPLING switch up to continue balancing the remainder o f the circuitry If power to the instrument is interrupted before the balancing cycle is completed an error will be detected by the next power on self test Press A...

Page 41: ...ch the apparent delay present in any of the other three channels This adjustment is most com monly used to eliminate delay differences between Chan nel 1 and Channel 2 that may be introduced by the probes and has no effect on common mode rejection when ADD VERTICAL MODE is selected Matching Channel 1 and Channel 2 delay is accomplished as follows 1 Preset the instrument controls and obtain a basel...

Page 42: ...k of the basic operation and adjustment of the oscilloscope timing Use the following procedure 1 Preset instrument controls and obtain a baseline trace as described in Initial Setup 2 Connect a 10X probe to the CH 1 OR X input con nector and connect the probe tip to the CALIBRATOR output 3 Adjust the Channel 1 POSITION control to center the display on the screen 4 Adjust triggering controls to obt...

Page 43: ... is referred to as LO The specific voltages which constitute a HI or a LO vary between individual devices For specific device character istics refer to the manufacturer s data book Hybrids Some of the circuits in this instrument are implemented in hybrid devices The hybrids are specialized electronic devices combining thick film and semiconductor tech nologies Passive thick film components and act...

Page 44: ...Theory of Operation 2445 Service 3831 10A Figure 3 1 Block diagram ...

Page 45: ...Theory of Operation 2445 Service 3831 10B Figure 3 1 Block diagram cont 3 3 ...

Page 46: ...ated circuit which responds by setting up the various signals that control the stages handling the real time display signals The controlled stages are stepped through a predefined sequence that is determined by the control data Typically as the sequence is being executed the Display Sequencer will be changing vertical signal sources Z Axis intensity levels triggering sources and horizontal sweep s...

Page 47: ...gh Voltage circuit board The resulting display may be of waveforms alphanumeric readout or a combina tion of both DETAILED CIRCUIT DESCRIPTION INTRODUCTION The following discussion provides detailed information concerning the electrical operation and circuit relation ships of the 2445 Oscilloscope Circuitry unique to the 2445 is described in detail while circuits common in the electronics industry...

Page 48: ...through R2652 The time required for C2661 to charge to the comparator switching threshold is approximately 100 ms When the voltage across C2661 reaches the 3 7 V reference level the comparator switches states and pin 8 of U2435C goes LO The RESET signal to the processor then goes HI to enable normal execution to begin and the pro cessor is directed to the starting address of the power up routine w...

Page 49: ...bits are decoded by U2480 This device initially separates the total addressable memory space 64k bytes into eight 8k byte blocks Addresses in the top 32k bytes address bit A15 Hi select one of four read only memories ROM U2162 U2178 U2362 or U2378 When the VMA Valid Memory Address and E Enable outputs from the Microprocessor go HI the HEX DECODED BY ADDRESS U2480 AND U2770 HEX DECODED BY ADDRESS U...

Page 50: ...re used to control processor and thus oscilloscope operation Addresses from the Microprocessor that fall within the top 32k bytes of addressable space cause one of the four read only memory integrated circuits to be enabled See Address Decode description Instructions are read out of the enabled ROM or PROM 1C from the address location present on its 13 address input pins AO through A12 The eight b...

Page 51: ... front panel potentiometers Every tenth interrupt cycle scanning the front panel switches and checking the 50 12 DC inputs for overloads is added to the previously mentioned tasks If all the tasks are not completed at the end of one inter rupt cycle the real time interrupt request restarts the analog updates but as soon as those are accomplished the Microprocessor will pick up with its additional ...

Page 52: ...eferences in the instrument and is used to determine the settings of the front panel potentiometer The 12 bit digital values to be converted are written to octal registers U2034 and U2134 for application to the DAC input pins The DAC then outputs two complementary analog currents that are proportional to the digital input data Complementary in this case means that the sum of the two output current...

Page 53: ...vice MNOS and requires a TTL to MNOS level shift of the input control and data signals A MNOS to TTL level shift of the output data is also required Inputs to U2008 are shifted to MNOS levels by U2118B through U2118F and the associated components while output data is shifted back to TTL levels by Q2025 U2118G and the associated components The EAROM data address and mode control bits are written by...

Page 54: ...med into the read only memory ROM These routines are explained in the Maintenance section of this manual Front Panel Switches The Front Panel Switches are arranged in a ten row by five column matrix with each switch assigned a unique location within the matrix see Figure 3 4 A closed switch connects a row and a column together through an isolating diode To detect a switch closure the switch matrix...

Page 55: ...t from last set value into a corre sponding control voltage When producing the actual analog control levels the processor can manipulate the digital values read for the various pots before sending the output data to the DAC This allows many of the oscilloscope parameters to vary in an enhanced fashion The pot data is manipulated by the processor in a manner that produces such features as variable ...

Page 56: ...cts that a front panel control has changed and a different status display is required a new status word is generated and applied to pin 1 of U3300 As each of the bits is clocked into the QA position of U3300 the preceding bit is shifted to the next register position After 32 bits have been clocked into and 24 bits through U3300 all four LED Status registers are full and contain the LED illuminatio...

Page 57: ...n until opposing data is clocked into the Auxiliary Control Register and strobed into the relay All coil leads for the remaining relays are set HI and only the selected relay will be set To set the seven remaining Attenuator and coupling relays the sequence just described is repeated seven more times Whenever the Microprocessor determines that the attenuation factor or input coupling has changed t...

Page 58: ... 15 Cl 16 L115 R115 and variable cap acitor Cl 18 is matched to the 78 ns delay of the vertical delay line DL100 diagram 6 Channel 2 Preamplifier Operation of Channel 2 Preamplifier U200 is nearly identical to that of the Channel 1 Preamplifier just described The exceptions are that the output polarity of the Channel 2 signal may be either normal or inverted and that the signal obtained from the B...

Page 59: ...of the SCALE ILLUM control During SGL SEQ display mode the graticule is illumi nated only once during the sequence for photographic purposes In this mode a HI is initially written to Auxiliary Control Register U150 bit QH This turns on U130Cand shunts the base drive current of U130D and U130E to ground A t the point in the sequence when the graticule should be illuminated the processor writes a LO...

Page 60: ...e end of an A Sweep SGA goes HI or in response to a readout request ROR from the Readout circuitry diagram 7 While in the readout mode the BLANK control signal is driven by the readout blank ROB input signal on pin 5 also from the Readout circuitry The readout active line ROA pin 6 when set LO tells the Readout circuitry that readout dots may be displayed if necessary The ROA signal is always set ...

Page 61: ... through U850B and U850C to the two sweep hybrids The selected reference level is compared against the changing sweep ramp voltages to generate the delay gates that control each sweep s functions After an A Sweep has been initiated by a trigger a delay gate circuit within U700 compares the A Sweep ramp voltage to the selected delay reference When the sweep ramp reaches the delay reference level th...

Page 62: ...ROB signal from the Readout circuitry and the readout intensity ROI signal pin 23 controls the BRIGHT output level During holdoff the Display Sequencer always sets the readout active ROA line LO As previously described setting the ROA signal LO allows the Readout circuitry to display readout dots In some settings of the SEC DIV switch with adequate trigger rates holdoff time is provided for the Re...

Page 63: ...er When the proper triggering criteria to initiate a sweep are detected a trigger ing gate signal is produced to start the selected sweep Control data from the processor defining trigger mode coupling and slope parameters for each trigger is clocked into two storage registers internal to U500 by the A TRIG CLK signal on pin 23 CCA and the B TRIG CLK signal on pin 47 CCB The Display Sequencer selec...

Page 64: ...e settings allow the processor to precisely calculate the characteristics of the current mirror circuits at their various multiplication factors and the charging characteristics of the timing capacitors These values are stored as calibration constants in nonvolatile memory EAROM U2008 diagram 2 Once the calibration constants are set any setting of the SEC DIV switch causes the Microprocessor to re...

Page 65: ...ound potential through R558 setting the lower limit of the CALIBRATOR output signal As the CAL signal goes from LO to HI the emitter of U550D is pulled HI to reverse bias U550C Bias current for Q550 is established and the transistor is turned on The voltage at the emitter of Q550 rises to a level of 2 4 volts determined by the voltage regulator composed of U165B U550A U550B and associated componen...

Page 66: ...onents inverts the readout vertical signal for application to the CH5 input The amplifier is an inverting unity gain configuration with transistors U475A and U475B connected as an emitter coupled pair The base of U475A is referenced to ground through R482 The base of U475B is pulled to the same level by the negative feed back from emitter follower U475D through R478 The noninverted signal applied ...

Page 67: ...m find input pin BF pin 15 of U600 wiii be pulled HI While BF is HI the dynamic range of Vertical Output Amplifier U600 is reduced and all deflected traces will be held to within the vertical limits of the crt graticule OUTPUT PROTECTION CIRCUIT A current limit circuit composed of transistors Q623 and Q624 protects the Vertical Output Amplifier from a short circuited output or a bias loss conditio...

Page 68: ...DC Restorer circuitry and sets the crt beam intensity The BLANK input signal applied to U950 pin 5 also from the Display Sequencer blanks the trace during sweep retrace chop switching and readout blanking by reducing the VZOUT signal to a blanked level Sweep gate z axis signals SGAZ and SGBZ from the A Sweep and B Sweep hybrids U700 and U900 respectively diagram 5 are applied to the Z Axis Amplifi...

Page 69: ...position shifts due to display intensity variations are minimized READOUT The Readout circuitry diagram 7 is responsible for displaying the alphanumeric readout characters on the crt An eight bit character code specifying each character or cursor segment to be displayed is written from the Micro processor to a corresponding location in the Character RAM U2920 a 128 x 8 bit random access memory int...

Page 70: ...al ROS1 strobe clocks the eighth bit of character data from U2960 to U2860 on the negative edge and the positive edge of the strobe clocks the eighth character address bit an unused bit into U2960 With control bit Q4 from U2865 LO the outputs of U2860 are enabled and the eight bits of character data CDO through CD7 are written in parallel into the Char acter RAM at the location selected by the sev...

Page 71: ...ich the individual dots that make up the character are positioned on the crt and turned on The EOCH end of character signal applied to U2885A prevents the counter from incrementing until all dots of the character have been displayed As the last dot of a character is addressed the EOCH bit at pin 2 of U2855A goes LO The next GETDOT pulse increments U2940B and the next RAM location is addressed to s...

Page 72: ...ough DD2 horizontally position the dots within the eight by sixteen character matrix see Figure 3 7 The eight bits of position data are written to the perma nently enabled DAC each time a new dot is requested by the Dot Cycle Generator The GETDOT signal applied to pin 11 Chip Select enables the DAC to be written into and the falling edge of the 5 MHz clock applied to pin 12 Write writes the data a...

Page 73: ...tages for one segment of the cursor are routed from Horizontal DAC through analog switch U2805 and buffer U2820B to horizontally position each of the dots making up the cursor segment DLY REF 1 is then used to vertically position the second cursor and the Horizontal DAC positions each of the dots for that cursor segment The cycle is repeated until all segments of both cursors are displayed Delta t...

Page 74: ...request at U2850B pin 12 to the Q output pin 9 where it is applied to the SI input pin 10 of prioritizer U2985 The LO on the SI input of the prioritizer will remain until another ROSFRAME request from the Timing Logic occurs and the encoded priority at the output pins of U2985 will remain as it is presently set Finally the least desirable dot display time is during a waveform trace display This di...

Page 75: ...me is completed Either a negative or positive transition on pin 2 of U2990A will cause the output at pin 3 to go HI since the Q output of U2950A is still at the opposite level The HI from U2990A indicates that the end of the present subframe has occurred and it sets up the prioritizer to decrement with the next REFRESH clock At the same time that the prioritizer decrements the changed level of the...

Page 76: ...ontrol to the Readout Board and will then set the ROA readout active line LO The LO will be clocked into U2880B and the Dot Cycle Generator will generate a GETDOT signal resetting the readout request from flip flop U2950B Only one dot is displayed for each readout request A similar readout display request will be generated when priority two or higher displays are required when sweep gates are not ...

Page 77: ... Dot Timer The Dot Timer composed of U2890A and U2830A and B generates three time related signals used to synchronize the display and maintain the proper sequencing of the individual character dots The two least significant bits of the Dot Timer from U2830B pins 11 and 10 are reset at the beginning of a dot cycle by a LO STARTDOT signal applied to the reset input of the counter via U2890A As the d...

Page 78: ...956A and voltage follower U19568 Varying base drive to Q1981 holds the secondary voltages in regulation If the Cathode Supply voltage level tends too positive a slightly positive voltage will develop across C1932 This voltage causes the outputs of integrator U1956A and voltage follower U1956B to move negative The negative shift charges capacitor C l951 to a different level around which the induced...

Page 79: ...nsity signal driving the crt control grid and increases the strength of the lenses more at higher crt beam currents A higher beam current requires a stronger lens to cause an equal convergence of the beam DC Restorer The DC Restorer provides crt control grid bias and couples both the dc and the low frequency components of the Z Axis drive signal to the crt control grid This circuit allows the Z Ax...

Page 80: ...92 causes the Grid Bias voltage to gradually lower about ten volts from its power on level The charge on C l990 dissipates slowly therefore if instrument power is turned off and then immediately back on again the output of U1890A will still be near the 15 V lim it rather than starting at zero volts as when the crt was cold Z AXIS DRIVE LEVEL The variable level Z Axis signal VZOUT establishes the l...

Page 81: ...ced the amplitude of the square wave Z Axis signal increases accordingly This increased signal amplitude decreases the difference between the upper and lower clamped levels of the ac waveform and less charge is added to capacitor D The decreased voltage across capacitor D decreases the potential difference between the control grid and the cathode and more crt beam current is allowed to flow Increa...

Page 82: ...on As current flow warms the thermistors their resistances decrease and have little effect on circuit operation Spark gap electrodes E l001 and E l002 are surge voltage pro tectors If excessive source voltage is applied to the instrument the spark gaps conduct and the extra current flow quickly exceeds the rating of F90 The fuse then opens to protect the instrument s power supply The EMI electroma...

Page 83: ...rt Inverter action before the 8 V level is reached and current is drawn through T1050 via Q1Q50 This induces a current in the secondary winding of T1050 and charges C1025 positive via diode CR1022 The turns ratio of T1050 sets the secondary voltage at approximately 15 V and as long as the supply is being properly regulated C1025 will be charged up to that level and held there PREREGULATOR START UP...

Page 84: ...inal operating levels The slow buildup prevents a turn on current surge that would cause the current limit circuitry to shut down the supply During the startup capacitor Cl 072 acts as a substantia load and a relatively large current will flow in the windings of T1050 for the first few cycles of Preregulator switching These strong current pulses ensure that storage capacitor C l066 becomes charged...

Page 85: ...reference level to error amplifier U2 This increases the voltage applied to the primary winding of the output transformer since U2 sensing depends on a balanced condition Higher currents are induced in the secondary windings and the secondary voltages begin to return to their nominal values As the 5 Vd line returns to its nominal level base drive to the shunt transistor will be reduced and the vol...

Page 86: ... is done by conventional LC networks The 87 V unregulated supply is produced by a voltage doubSer circuit The positive plate of Cl 130 at the anode of CR1132 is referenced at approximately 45 V through diode CR1131 to the 42 V unregulated supply As the positive half cycle from the 42 V secondary winding actually about 45 V peak is applied to the negative plate of Cl 130 the positive plate is eleva...

Page 87: ...l go negative and the base emitter junction of Theory of Operation 2445 Service Q1222 will be biased into the active region As Q1222 turns on base drive for the Darlington pair Q1221 and pass transistor Q1220 is reduced The output will be held at the level required for voltage at the two inputs of amplifier U1281A to be in balance 87 V Current limiting is a foldback design and is performed by Q122...

Page 88: ...pply Finally the sensing divider formed by R1331 and R1332 is referenced to the 10 V reference instead of ground to enable sensing of negative voltage 8 V Regulator Operation of the 8 V Regulator is similar to that of the 87 V and 42 V Regulators Due to the lower operating voltages of the 8 V Regulator the common base transistor present in both the 87 V and the 42 V Regulators is not required Curr...

Page 89: ...indings The fan s speed is determined by the amount of drive current supplied by Q1698 and varies with ambient temperature As the ambient temperature in the cabinet increases the resistance of RT1696 decreases and additional base drive is provided to Q1698 The transistor conducts harder and the fan s motor speed is increased to provide more cooling capacity The back EMF produced by the motor field...

Page 90: ...he beginning of that section The item numbers in parenthesis next to each piece of equipment refer to the numbered equipment list of Table 4 1 Items 18 through 22 are used only for instrument calibration see the Adjustment Procedure in Section 5 Before performing this procedure ensure that the LINE VOLTAGE SELECTOR switch is set for the ac power source being used see Preparation for Use in Section...

Page 91: ...nection TEKTRONIX Part Number 103 0030 00 8 Precision BNC Cable Impedance 50 fi Connectors BNC Length 36 in Signal interconnection TEKTRONIX Part Number 012 0482 00 9 BNC Cable 2 required Impedance 50 fi Connectors BNC Length 24 in Signal interconnection TEKTRONIX Part Number 012 0017 00 10 Dual Input Coupler 2 required Connectors BNC female to dual BNC male Signal interconnection TEKTRONIX Part N...

Page 92: ... 2 in Adjust variable resistors and capacitors TEKTRONIX Part Number 003 0675 00 20 IX Probe Attenuation IX Bandpass 20 MHz Check power supply ripple TEKTRONIX P6101 01 21 Normalizer Input resistance 1 Mft Input capacitance 15 pf Check input capacitance TEKTRONIX Part Number 067 0681 01 22 Tunnel Diode Pulser Rise time 125 ps or less Check transient response TEKTRONIX Part Number 067 0681 01 4 3 ...

Page 93: ...and B SEC DIV VAR In detent X I0 MAG Off button out At and AV Off press and release until associated readout is off tr a c k in g Off button out TRACE SEP Fully CW TRIGGER HOLDOFF Fully CCW LEVEL Midrange SLOPE plus A B TRIG SELECT A MODE AUTO LVL SOURCE VERT COUPLING DC 1 Verify CH 1 and CH 2 50 ft OVERLOAD Protection a Connect the Power Supply to the CH 1 OR X input connector via a 50 ft BNC cab...

Page 94: ...pensation in Section 2 of this manual b Connect the CALIBRATOR output signal to the CH 1 OR X input connector using a 10X probe c Position the ground reference trace 2 divisions below the center horizontal graticule line d Set the CH 1 Input Coupling switch to 1 M S DC e CHECK Displayed signal is vertically centered and has an amplitude of 3 88 to 4 12 divisions f Set the CH 1 Input Coupling to th...

Page 95: ...gger Level readings are with in the limits given in the Peak column of Table 4 2 d Connect the Calibration Generator to the CH 1 OR X input connector via a 50 Q BNC cable Do not use a termination 13 Set the TRIGGER LEVEL for a stable display 14 Pull the SEC DIV knob out and set the B TRIGGER MODE to TRIG AFT DLY e CHECK CH 1 and CH 2 VOLTS DIV AV and TRIG GER LEVEL readout accuracies as follows 1 ...

Page 96: ...1 V 4 90 to 5 10 97 5 mV to 102 56 mV 89 mV to 111 mV 7 5 mV to 7 5 mV 50 mV 0 2 V 3 92 to 4 08 194 mV to 206 mV 177 mV to 223 mV 17 mV to 17 mV 147 mV to 253 mV 47 mV to 4 7 mV 0 1 V 0 5 V 4 90 to 5 10 486 mV to 514 mV 0 449 V to 0 551 V 0 036 V to 0 036 V 0 2 V 1 0 V 4 90 to 5 10 0 975 V to 1 025 V 0 90 V to 1 10 V 0 07 V to 0 07 V 0 5 V 2 0 V 3 92 to 4 08 1 94 V to 2 06 V 1 78 V to 2 22 V 0 14 ...

Page 97: ...ion Generator to the CH 1 OR X and CH 2 input connectors via a 50 BNC cable and a Dual Input Coupler y CHECK Vertical deflection amplitude is 4 9 to 5 1 divisions z CHECK Signal amplitude reduces to 0 2 division or less when CH 2 INVERT is on button in aa Set VERTICAL MODE CH 3 On button in CH 1 CH 2 CH 4 ADD and INVERT Off buttons out bb Move the Dual Input Coupler to the CH 3 and CH 4 input conn...

Page 98: ...on Generator to the CH 1 OR X and the CH 2 input connectors via a 50 QBNC cable a 5X atten uator and a Dual Input Coupler c Set the output level of the Calibration Generator for an approximate 5 division vertically centered display for both channels d Use either the CH 1 or CH 2 VAR control to match signal amplitude between both channels e Set A and B SEC DIV 10 ns knobs locked X I0 MAG On button ...

Page 99: ...tput for a 4 division display at the reference frequency then change the generator frequency to 80 MHz v CHECK Signal display amplitude is 2 82 divisions or greater while sweeping the generator frequency from 80 MHz to 150 MHz w Move the signal to CH 4 and set the VERTICAL MODE switches to display CH 4 only x CHECK Repeat parts p through v for CH 4 y Disconnect the test setup I CHECK Signal displa...

Page 100: ... discount trace width e Move the signal to the CH 2 input connector and change the TRIGGER SOURCE switch to CH 2 f CHECK Amplitude of each trace other than CH 2 is 0 08 division or less discount trace width g Add a 50 Q BNC termination to the BNC cable and move the signal to CH 3 h Set the TRIGGER SOURCE switch to CH 3 and ad just the generator output for a signal display amplitude of 8 divisions ...

Page 101: ...isplay returns to normal c VERIFY There is less than 0 2 division vertical trace shift between adjacent settings of the CH 1 and CH 2 VOLTS DIV switches as they are rotated through each of their positions d VERIFY There is less than 1 0 division vertical trace shift as the CH 1 and CH 2 VOLTS DIV VAR controls are rotated fully CCW e VERIFY There is less than 0 5 division vertical trace shift when ...

Page 102: ...rt t below t Disconnect the test setup 1 Check BW LIMIT Operation a Set VERTICAL MODE CH 1 Off button out CH 2 On button in BW LIMIT On button in A and B SEC DIV 50 ns knobs locked VOLTS DIV CH 2 10 mV b Connect the Leveled Sine Wave Generator output to the CH 1 OR X input connector via a precision 50 Q BNC cable c Set the generator frequency to 50 kHz and adjust the output level for a 6 division ...

Page 103: ...us AUTO LVL VERT DC 1 Check A and B Triggers NOTE The Trigger Level Readout Accuracies are checked in the Vertical Performance Checks a Refer to Table 4 4 to determine what the A Trigger requirements are and at what frequencies various checks are made b Using a 50 Q BNC cable connect one of the following test generators to the CH 1 input connector Select the gen erator that produces the proper fre...

Page 104: ... 50 ps 0 05 division at 10 ns div with X I0 MAG I If trigger sensitivity is close to the specified limits given in steps c through k above test all of the frequency coupling combinations given in Table 4 4 for CH 2 m Move the test signal to CH 3 and CH 4 in turn and repeat parts c through f using Table 4 5 Table 4 4 CH 1 or CH 2 Triggering Conditions Test Fre quency Minimum Vertical Display Levels...

Page 105: ... SEC DIV and X I0 MAG switches as required to maintain a well defined display g Pull the B SEC DIV knob out rotate it to 5 ms and push it back in h Press the A B TRIG button and set the B TRIGGER MODE to TRIG AFT DLY i Rotate the AREF OR DLY POS control CCW until the delay readout indicates DLY 0 00 ms t Disconnect the test setup j CHECK Display will trigger as the TRIGGER LEVEL control is rotated...

Page 106: ...to CH 2 CH 3 and CH 4 in turn selecting each channel as the display source Repeat parts f through k for each channel 4 Check Slope Selection and Verify Line Trigger a Set A and B SEC DIV 2 ms knobs locked X I0 MAG Off button out TRIGGER MODE AUTO SOURCE LINE COUPLING AC VOLTS DIV CH 1 5 V Input Coupling CH 1 1 MQ DC In the next part DO NOT connect the probe ground lead to the ac power source b Att...

Page 107: ...GGER HOLDOFF B ENDS A LEVEL Midrange SLOPE plus MODE AUTO LVL SOURCE VERT COUPLING DC c Pull the B SEC DIV knob out and set the B TRIGGER MODE to RUN AFT DLY d Set the AREF OR DLY control for a DLY readout of approx 1000 ns e VERIFY An intensified zone appears on the dis played signal near graticule center f Rotate the AREF OR DLY POS control to center the intensified zone on one of the time marke...

Page 108: ...s are within 0 0 6 division of the 2nd and 10th vertical graticule lines for unmagnified sweeps and within 0 1 division for magnified sweeps the sweep timing accuracy is con servatively within limits When the timing accuracy is checked at each sweep speed note any SEC DiV set ting at which the timing error exceeds the 0 6 division limit Check these sweep speeds against the major division time inte...

Page 109: ...5 ns to 4055 ns 10 M S 10 ms 79 30 ms to 80 70 ms 1 ms 7 890 ms to 8 110 ms 20 ms 20 ms 158 60 ms to 161 40 ms 2 mS 15 780 ms to 16 220 ms 50 ms 50 ms 396 5 ms to 403 5 ms 5 ms 39 45 ms to 40 55 ms 0 1 ms 0 1 ms 793 0 m s to 807 0 fis 10 ms 78 90 ms to 81 10 ms 0 2 ms 0 2 ms 1586 0 ms to 1614 0 ms 20 ms 157 80 ms to 162 20 ms 0 5 ms 0 5 ms 3965 ms to 4035 ms 50 ms 394 5 ms to 405 5 ms 1 ms 1 ms 7 ...

Page 110: ...eadout indicates a difference of 0 30 ns or less h CHECK AREF cursor aligns with the 1st graticule line within 0 2 division i Rotate the A control CW until the cursor stops moving j CHECK A cursor aligns with the 11th graticule line within 0 2 division p Set B SEC DIV B TRIGGER MODE X I0 MAG At AREF OR DLY POS 10 ns knob in RUN AFT DLY Off button out Off DLY Set for zero delay k Set the A and B SE...

Page 111: ...th 398 3 ns to 401 70 ns a10 ns with X10 MAG on button in f CHECK At readout is within the limits listed in Table 4 8 for the 1st 20 ns time marker then check that the 2nd through 10th time markers are within the given limits as the A control is rotated CW to superimpose each successive time marker on the reference time marker k CHECK At readout is within the limits listed in Table 4 8 for the 1st...

Page 112: ...ut b Select 1 ms time markers from the Time Mark Generator c Aiign the intensified zones with the 10th time marker using the AREF OR DLY POS and A controls Superimpose the zones to obtain a At readout display of 0 000 ms d Push in the B SEC DIV knob and adjust TRACE SEP to separate the traces e CHECK For 0 8 division or less of horizontal jitter on the rising edge of both time markers Table 4 9 De...

Page 113: ...0 Q DC b Connect a 50 kHz signal from the Leveled Sine Wave Generator to the CH 1 OR X input connector via a precision 50 Q BNC cable i Set A SEC DIV B SEC DIV SEC DIV VAR At AREF OR DLY POS B TRIGGER MODE 50 ms 10 ms knob in CW in detent Off DLY readout Zero delay RUN AFT DLY j Repeat parts b through h for the B Sweep c Set the generator output for a 6 division horizontal display d Change the gen...

Page 114: ...veled Sine Wave Generator and the CH 1 POSITION control for a 50 kHz 2 division horizontal display centered on the graticule b Use the CH 1 POSITION control to align the left edge of the signal with the left side vertical graticule line c CHECK Signal display is 1 8 to 2 2 divisions mea sured horizontally d Use the CH 1 POSITION control to position the right edge of the signal on the right side ve...

Page 115: ...RATOR Repetition Rate NOTE Refer to the Adjustment Procedure to check the accu racy of the CALIBRATOR output levels a Connect a 10X probe from the CALIBRATOR termi nal to the CH 1 OR X input connector b Connect 1 ms time markers from the Time Mark Gen erator to the CH 2 input connector via a 50 ft BNC cable c Adjust the CH 2 VOLTS DIV switch for several divi sions of marker display d CHECK Horizon...

Page 116: ...scilloscope to the A GATE OUT con nector located on the 2445 rear panel via a 50 Q BNC cable c CHECK Test oscilloscope displays a signal with a high level between 2 4 V and 5 V and a low level between 0 V and 0 4 V f VERIFY Duration of the low level increases to at least 10 times the time measured in part e when the 2445 HOLDOFF control is rotated to the maximum CW position but not in the detent g...

Page 117: ... CHOP and ADD Modes and TRACE SEP a VERIFY CH 1 trace is visible with no VERTICAL MODE buttons selected all out b Press the CH 2 VERTICAL MODE button in c VERIFY CH 1 trace is not displayed and the CH 2 trace is displayed d Press the CH 1 VERTICAL MODE button in NOTE Separate the traces by approximately 1 division using the VERTICAL POSITION controls Do not position either trace precisely at grati...

Page 118: ...R SOURCE A SEC DIV B SEC DIV CHOP ALT TRACE SEP appear to be displayed CH 4 20 ms 10 ms knob out and rotated ALT button out CCW until traces are separated NOTE Refer to Figure 2 8 Readout Display Locations for the positioning of the readout display information a Set VOLTS DIV CH 1 CH 2 CH 3 and CH 4 0 1 V b Connect the standard accessory 10X probe encoded to the CH 1 input connector v VERIFY An al...

Page 119: ...sent ed and in their entirety to ensure that control settings will be correct for the following steps The adjustments in CAL 01 02 03 and 04 should be performed in numerical sequence i e CAL 01 should be done before CAL 02 CAL 02 should be done before CAL 03 etc Performing partial procedures when setting the automatic calibration constants i e only one or two of the CAL steps is not recommended an...

Page 120: ...Control Settings Controls settings not listed will not affect the procedure VERTICAL VOLTS DIV CH 2 0 1 V CH 3 and CH 4 0 1 V buttons out CH 1 and CH 2 VAR In detent Input Coupling CH 1 and CH 2 1 Mfi DC VERTICAL MODE CH 1 On button in CH 2 CH 3 and CH 4 Off buttons out ADD INVERT and BW LIMIT Off buttons out ALT CHOP ALT button out VERTICAL POSITION Midrange A and B SEC DIV X Y knobs locked A and...

Page 121: ...V J119 1 14 775 to 15 225 10 mV 2 mV d Repeat parts a and b for the other test points listed in g Using a 1X probe connect the test oscilloscope probe Table 5 1 ground lead to chassis ground Connect the probe tip to the first test point listed in Table 5 1 e Disconnect the DMM f Set the test oscilloscope Sweep Speed Input Coupling CH 1 Vertical controls Trigger controls Volts Division BW Limit as ...

Page 122: ... VERTICAL POSITION Midrange A and B SEC DIV X Y knobs locked A and B SEC DIV VAR In detent Horizontal POSITION Midrange TRIGGER MODE AUTO LVL SOURCE VERT COUPLING DC SLOPE plus LEVEL Midrange HOLDOFF In detent AV and At Off press and release until readout display disappears TRACKING INDEP INDEP button out INTENSITY Visible display READOUT INTENSITY Scale factors off CCW from MIN SCALE ILLUM Fully ...

Page 123: ...tment Procedure 2445 Service b Connect 10 ms time markers from the Time Mark Generator to the CH 2 input connector via a 50 Q BNC cable c Use the Horizontal POSITION control to align the time markers with the vertical graticule lines Use the CH 2 POSI TION control to align the base of the signal with the bottom graticule line d Set the CH 2 VOLTS DIV switch for at least a 6 divi sion vertical disp...

Page 124: ...er c ADJUST Z Axis Transient Response R1834 for the most uniform intensity across the first division of display 6 Adjust High Drive Focus R1842 NOTE if the previous step was not performed first setup the Initial Control Settings at the beginning of the CRT adjustments then proceed as follows a Set AV On AV readout READOUT INTENSITY Fully CW b Use the Horizontal POSITION control to place the beginn...

Page 125: ...E plus LEVEL Midrange HOLDOFF In detent At On At readout TRACKING INDEP INDEP button out INTENSITY Left of center READOUT INTENSITY As required for a visible display SCALE ILLUM Fully CCW FOCUS Best focused display 1 Adjust DAC Ref R2127 NOTE The objective of this step is to make the total range of the DAC output voltage sum of the CCW and CW readings equal to 2 5 V a Connect the digital multimete...

Page 126: ...switching between positions reestablish the refer ence display amplitude at each position and observe the square wave front corner to make the comparison f Move the input signal to CH 2 and change the VERTI CAL MODE to display CH 2 only Adjust the generator amplitude for a 6 division signal amplitude g Set the normalizer for a square front corner over approximately the first 40 ns 0 4 division of ...

Page 127: ...ator Item 5 5X Attenuator Item 16 50 BNC Cable Item 9 Digital Multimeter DMM Item 18 Alignment Tool Item 19 See ADJUSTMENT LOCATIONS 4 a t the rear o f this m anual for test point and adjustm ent locations Initial Control Settings CAL NO CAL jumper CAL position between pins 1 and 2 prior to turn ing on power N O TE When perform ing the autom atic CAL steps initial set ting o f the front panel cont...

Page 128: ...ew both A and B Sweeps Position start of trace at the left graticule line NO TE Som e sequential pairs o f steps are iterative i e the earlier step is recalled if an adjustm ent is made in the later step Occasionally on the earlier o f some o f these pairs the readout m ay indicate L IM IT before the correct control setting is reach ed if this occurs proceed to the next AUTOCAL step A fter the adj...

Page 129: ...y the 2nd time marker and ADJUST A control to intensify the 10th time marker Superimpose the delayed B Sweep time markers within 0 2 division z Press up and release TRIGGER COUPLING switch Set the Time Mark Generator for 1 ns time markers aa For each step in Table 5 2 do the following 1 Adjust the AREF OR DLY POS and A controls as necessary to intensify the indicated time marks on the A Sweep and ...

Page 130: ...TE The readout prom pts the operator by showing the controls to be m oved upper left com er and upper center the autocal step num ber upper right corner the amplitude o f signal to be applied to either the CH 1 or CH 2 connectors lower left corner and any other scope function that is enabled An exam ple from step d above is CHI VAR CH2 POS 111 500 mV BWL e Connect a 0 5 V standard amplitude signal...

Page 131: ...0 mV and BWL r With the Calibration Generator set for a 500 mV standard amplitude signal press up and release the TRIG GER COUPLING switch s ADJUST CH 2 VERTICAL POSITION control until the CH 1 Input Coupling 1 Mfl DC indicator remains illumi nated then press up and release the TRIGGER COUPLING switch t CHECK First step number listed in Table 5 5 appears in the readout u Apply the corresponding st...

Page 132: ...TRIGGER COUPLING switch c CHECK Procedure automatically steps from 201 through 214 and stops at 215 d CHECK Readout indicates CH 1 500 mV and step 215 The readout prompts the operator by showing which connector the input signal should be applied to upper left corner the amplitude of that signal upper center and the autocal step number upper right corner An example from step d above is CHI 500 mV 2...

Page 133: ...H 1 and CH 2 POSITION controls to vertically overlay the traces near the center of the grati cule area h Set the Horizontal POSITION control to set the rising edge of the signal near the center vertical graticule line i Press the X I0 MAG button in to obtain a magnified display j Pull out the B SEC DIV knob k CHECK Readout indicates CH 2 DLY ADJUST A and that the A control will move the leading ed...

Page 134: ...nd BW LIMIT Off buttons out ALT CHOP ALT button out VERTICAL POSITION Midrange A and B SEC DIV 20 ns knobs locked A and B SEC DIV VAR In detent Horizontal POSITION Midrange TRIGGER MODE AUTO LVL SOURCE VERT COUPLING DC SLOPE plus LEVEL Midrange HOLDOFF In detent AV On RATIO readout AREF OR DLY POS and A INTENSITY READOUT INTENSITY SCALE ILLUM FOCUS Cursors near the 3rd line above and 3rd line belo...

Page 135: ...sors should now be on or near the dotted graticule lines marked 0 and 100 e Set the CH 1 VOLTS DIV VAR to the detent position NOTE Care must be taken not to disturb the position of the controls adjusted in parts b through e during the bal ance of this procedure If they are accidentally moved repeat the procedure from the beginning k ADJUST Vertical Gain R638 and Vertical Center ing R639 to vertica...

Page 136: ...tical trace shift when the CH 1 VOLTS DIV switch is rotated through all of its settings aa Set the generator output level for an 8 division display e Set the VERTICAL MODE switches to disable CH 1 and display CH 2 bb Use the CH 1 Vertical and the Horizontal POSITION controls to center the CH 1 display on the graticule f CHECK For less than 0 2 division vertical trace shift when the CH 2 VOLTS DIV ...

Page 137: ...ECK Horizontal opening in the elipse is 0 3 divi sion or less measured at the center horizontal graticule line e ADJUST X Y Phasing Cl 18 for no opening in the elipse h Disconnect the test setup f Set the generator frequency to 2 MHz and adjust the amplitude for a 6 division vertical signal display i Turn POWER Off 5 19 ...

Page 138: ... static voltage from your body by wear ing a grounded antistatic wrist strap while handling these components Servicing static sensitive components or as semblies should be performed only at a static free work sta tion by qualified service personnel 4 Nothing capable of generating or holding a static charge snouid be aiiowea on the work station surface 5 Keep the component leads shorted together wh...

Page 139: ...result in instrument fail ure especially under high humidity conditions Avoid the use o f chemical cleaning agents which might damage the plastics used in this instrument Use a nonresidue type cleaner preferably isopropyl alcohol or a solution o f 1 mild detergent with 99 water Before using any other type o f cleaner consult your Tektronix Service Center or representative Exterior INSPECTION Inspe...

Page 140: ...nt is replaced conduct a Perfor mance Check for the affected circuit and for other closely related circuits see Section 4 If repair or replacement work is done on any of the power supplies conduct a complete Performance Check and if so indicated an instrument read justment see Sections 4 and 5 Table 6 3 Internal Inspection Check List Item Inspect For Repair Action Circuit Boards Loose broken or co...

Page 141: ...o the following procedure are the Attenu ator assemblies and the Front Panel module Clean these assemblies only with isopropyl alcohol as de scribed in step 4 Periodic checks of the transistors and other semiconduc tors in the oscilloscope are not recommended The best check of semiconductor performance is actual operation in the instrument 1 Gain access to the parts to be cleaned by removing easil...

Page 142: ...or the reference designators and symbols used to identify com ponents Important voltages and waveform reference num bers enclosed in hexagonal shaped boxes are also shown on each diagram Waveform illustrations are located adja cent to their respective schematic diagram Circuit Board Illustrations Circuit board illustrations showing the physical location of each component are provided for use in co...

Page 143: ...ad and the voltage rating Since these capacitors are easily destroyed by reversed or excessive voltage be careful to observe the polarity and voltage rating when replacing them DIODE COLOR CODE The cathode end of each glass encased diode is indicated by either a stripe a series of stripes or a dot For most diodes marked with a series of stripes the color combination of the stripes identifies three...

Page 144: ...try into the Diagnostic Monitor and its uses are explained in the Diagnostic Routines discussion later in this section 3 Check Control Settings Incorrect control settings can give a false indication of instrument malfunction If there is any question about the correct function or operation of any control refer to either the Operating Information in Section 2 of this manual or to the 2445 Operators ...

Page 145: ...sensitivity precautions located at the beginning of this section TRANSISTORS A good check of a transistor is actual performance under operating conditions A transistor can most effectively be checked by substituting a known good component However be sure that circuit conditions are not such that a replacement transistor might also be damaged If substitute transistors are not available use a dynami...

Page 146: ...ther reverse biased or defective depending on polarity RESISTORS Check resistors with an ohmmeter Refer to the Replaceable Electrical Parts list for the tolerances of resistors used in this instrument A resistor normally does not require replacement unless its measured value varies widely from its specified value and tolerance INDUCTORS Check for open inductors by checking con tinuity with an ohmm...

Page 147: ...try into the moni tor from the normal mode begins at ALL TESTS while entry from power up starts at the first failed test Since in a failure mode the crt readout may not be able to display the select ed menu item the VERT TRIGGER SOURCE indicator illu minates as a reference when ALL TESTS is selected With the VERT TRIGGER SOURCE indicator illuminated the user may scroll to the desired test or exerc...

Page 148: ...er MODE down 68 Trigger MODE up 70b A B TRIG select Test 03 Readout Board 01 Shift register failure 02 Readout RAM failure Test 04 EAROM XI Parity error on read bit 0 set X8 Bad read after write bit 3 set IX Bad checksum bit 4 set Test 05 Main Board 01 AUTO LVL failed to trigger X2 Negative level not negative enough X4 Negative level too negative 2X Positive level not positive enough 4X Positive l...

Page 149: ... diagnostic information re fers to see Options manual for details For the basic instru ment the OD location is blank TYPE refers to routine type All Tests ALL Test TEST Exerciser EXER or Calibration CAL X indicates which bit of the Option Select Register is set to turn on the option called out by OD see Options manual for description of Options Select Register This bit is zero for the basic instru...

Page 150: ... write to ensure only one bit at a time changes Each of the succeeding address locations is read then written to in the same way until the RAM is filled with ones After the RAM is filled a 0 is walked through each bit location in a similar manner Test checks RAM address decoding RAM address lines RAM data lines and Data Bus Buffers ROM TEST The ROM test performs three checks on each of the system ...

Page 151: ...ested in the same manner Test checks Readout RAM addressing Readout RAM data lines and RAM read write capability EAROM Test 04 Three checks are performed on the EAROM to verify its contents and the interface circuitry Daarl IW ito T he f n n to n tc r f n na hratinn ar a I 1V U V I V I II V I V 0 I I I IV W W I IIVI II V V I V I IV I V V U I I V I I W l v read modified and then reread to verify fu...

Page 152: ...umber Potentiometer 01 HOLDOFF 02 Trigger LEVEL 03 SEC DIV VAR 04 Horizontal POSITION 05 A A section 06 A B section 07 A REF OR DLY POS A section 08 A REF OR DLY POS B section 09 CH 1 VOLTS DIV VAR 0A CH 2 VOLTS DIV VAR Table 6 9 DAC Multiplexer D Codes L is the column code for the previously activated switch NOTE For all momentary switches except A B TRIG only the closed position will be shown in...

Page 153: ...ine the contents of any or all EAROM loca tions The EAROM has 100 decimal locations 63 hexadec imal Addresses above 63 hex are not defined When entered the Exerciser displays the contents of EAROM lo cation 00 hex on the top line of the crt display Calibration constants reside between addresses 01 hex and 4C hex and each should have odd parity as explained below The remaining locations may be of e...

Page 154: ... SS is the suffix of the ROM part number version number AAAA is the starting address of the ROM address where the ROM should be installed Pressing the COUPLING switch up increments the rou tine to the next ROM Header pressing it down exits the routine CONTROLLER LATCHES EXERCISER This routine is not user selectable but it runs automatically when the Diag nostic Monitor is waiting for a key activat...

Page 155: ...ical Parts list for the proper value rating tolerance and description NO TE Physical size and shape o f a component m ay affect instrum ent perform ance particularly a t high frequen cies Always use direct replacem ent components un less it is known that a substitute will not degrade instrum ent performance Special Parts In addition to the standard electronic components some special parts are used...

Page 156: ...older Extractor No static charge retention Unsoldering static sensitive devices and components on multilayer boards Pace Model PC 10 10 Spray Cleaner No Noise Switch and Pot cleaning Tektronix Part Number 006 0442 02 11 Pin replacement Kit Replace circuit board connector pins Tektronix Part Number 040 0542 00 12 IC Removal Tool Removing DIP 1C packages Augat T il4 1 13 Isopropyl Alcohol Reagent gr...

Page 157: ...me If the device must be removed intact for possible reinstallation do not heat adja cent conductors consecutively Apply heat to pins at alter nate sides and ends of the 1C as soider is removed Aiiow a moment for the circuit board to cool before proceeding to the next pin Hybrid circuits and heatsinks are removed as a unit by removing the mounting nuts at the four corners of the heatsink housing A...

Page 158: ...ue to a bend placed in the component leads during machine insertion To m ake rem oval o f machine inserted components easier straighten the component leads on the reverse side o f the circuit board 2 When removing a multipin component especially an 1C do not heat adjacent pins consecutively Apply heat to the pins at alternate sides and ends of the 1C as solder is removed Allow a moment for the cir...

Page 159: ... cabinet removed do not touch exposed connections or com ponents Som e transistors m ay have elevated case voltages Disconnect the ac pow er source from the instrum ent and verify that the line rectifier filter capac itors have discharged before cleaning the instrum ent or replacing parts see label on the prim ary pow er shield 8 Slide the cabinet off of the instrument To reinstall the wrap around...

Page 160: ...at procedure 2 Set the instrument bottom down on a flat surface 3 Remove the two securing screws from the top edge of the rear panel chassis 4 Remove the securing screw from the left side of the chassis 5 Remove the two top securing screws at the front edge of the cover plate 6 Remove the top securing nut at the rear of the cover plate 7 Lift the Top Cover Plate up and away from the instrument 6 2...

Page 161: ... in that procedure 2 Place the instrument on its left side on a flat surface 3 Disconnect the three ribbon cable connectors from the Control board P251 P651 and P652 see Figure 6 3 4 Disconnect the two ribbon cable connectors from the Main board P511 and P512 5 Remove the five mounting screws securing the board to the chassis one at each corner of the board and one at the center 6 Lift the Control...

Page 162: ...f the Probe Power option is installed disconnect the Probe Power connectors from the Power Supply assembly P201 and P202 12 Lift the Power Supply assembly from the instrument To reinstall the Power Supply assembly perform the re verse of the preceding instructions The following procedures describe the further disassem bly of the Power Supply circuit boards once the assembly is removed from the ins...

Page 163: ...nd one sin gle conductor connector from the front of the High Voltage board P902 P903 and P904 Note orientation for reinstallation 13 Tiit the top of the board out to dear the ieft side frame and pull the board up to disengage the High Voltage board pin connectors from the Main board 14 Lift the board from the chassis while carefully feeding the crt socket cabling and high voltage lead through the...

Page 164: ...the three securing screws and two securing studs from the rear of Front Panel board ASSEMBLY SEPARATION Separation of the Variable board from the Front Panel board is accomplished by the following steps 8 Partially separate the board from the front panel cover plate to expose the B SEC DIV knob microswitch and multipin connector 1 Using a 1 16 inch Allen wrench loosen the set screws in the CH 1 VO...

Page 165: ...glass seal of ihe crt neck pins 7 Dibuunnect the rear panel BNC connector leads from the rear of the Main Board PI 06 PI 07 and PI 08 8 Disconnect the CH 2 OUT connector from near the center of the Main board PI 05 9 Disconnect the six multipin connectors for the controls beneath the crt P111 P112 P113 P114 P115 and P116 10 Disconnect the two conductor connector for the Scale Illumination board fr...

Page 166: ... 3 Loosen the two screws on the left side of the crt sock et cover and remove the one on the right side Remove the cover 4 Unplug the crt socket by gently prying the socket evenly on both sides until the pins can be disengaged Do not apply excessive side pressure on the socket as it is being removed WARMING I The crt anode lead and the output term inal o f the High Voltage Multiplier can retain a ...

Page 167: ...nt while feeding the anode lead and Y Axis Alignment coil leads through their respective holes NOTE Once the crt is removed it should be stored in such a manner as to protect it from im pact If stored face down it should be placed on a soft nonabrasive sur face to prevent the crt face plate from being scratched To reinstall the crt perform the reverse o f the preceding instructions ...

Page 168: ...1 6 A 250 V 5 x 20 mm Quick acting Fuse cap 161 0104 06 159 0098 00 200 2265 00 An optional rear support kit is also available for use when rackmounting the 2445 Using this optional rear support kit enables the rackmounted instrument to meet or exceed the requirements of MIL T 28800C with respect to Type III Class 5 Style C electronic equipment for vibration and shock Other electrical and environm...

Page 169: ... 1 6 A 250 V 5 x 20 mm Quick acting Fuse cap FUTURE OPTIONS 161 0154 00 159 0098 00 200 2265 00 Technical documentation for options not available at the time of publication of this manual will be supplied in separate Operators and Service manuals for each option 7 2 ...

Page 170: ...mbly number Circuit number Read Resistor 1234 of Assembly 23 Example b A23A2R1234 component number A23 A2 R1234 Assembly number Subassembly number Circuit number Read Resistor 1234 of Subassembly 2 of Assembly 23 Only the circuit number will appear on the diagrams and circuit board illustrations Each diagram and circuit board illustration is clearly marked with the assembly number Assembly numbers...

Page 171: ...LEXINGTON PLANT 7625 BUSH LAKE R D P O BOX 35263 M ARQUARDT 67 ALBANY ST 170 WILBUR PLACE 1208 E ARQUES AVE N EW YURAKUCHO BLDG O RANG E STREET P 0 BO X 3608 1201 2ND STREET SOUTH P 0 BO X 5012 13500 N CENTRAL EXPRESSW AY 1102 SILVER LAKE RD ROUTE 202 ELECTRONICS PARK P 0 BOX 867 19TH AVE SOUTH 5005 E M CDOW ELL RD PO BOX 20923 464 ELLIS STREET RICHARDS AVENUE LO W ER WASHINGTON STREET 580 PLEASAN...

Page 172: ...1UF 100 0 500V 59660 0831610Y5P0102D A1C105 281 0064 00 CAP VAR PLSTC 0 25 1 5PF 600V 74970 273 0001 101 A1C106 283 0024 00 CAP FXD CER DI 0 1UF 80 20 50V 72982 8121N083Z5U0104Z A1C107 290 0943 00 CAP FXD ELCTLT 47UF 50 10 25V 55680 25ULB47V0T A1C108 283 0423 00 CAP FXD CER D1 0 22UF 80 20 50V 04222 DG015E224Z A1C113 283 0423 00 CAP FXD CER D I 0 22UF 80 20 50V 04222 DG015E224Z A1C114 290 0943 00 ...

Page 173: ...2982 8035D9AADC0G270M A1C415 283 0421 00 CAP FXD CER DIrO lUF 80 20 50V 04222 DG015E104Z A1C450 283 0421 00 CAP FXD CER DIrO lUF 80 20 50V 04222 DG015E104Z A1C434 283 0421 00 CAP FXD CER DIrO lUF 80 20 50V 04222 DG015E104Z A1C458 283 0421 00 CAP FXD CER DIrO lUF 80 20 50V 04222 DG015E104Z A1C460 283 0421 00 CAP FXD CER DIrO lUF 80 20 50V 04222 DG015E104Z A1C464 281 0763 00 CAP FXD CER DI 47PF 10 1...

Page 174: ... CAP FXD CER D I 0 1UF 20 50V 59660 SA205E104MAA A 1C 9 3 3 283 0421 00 CAP FXD CER D l 0 1UF 80 20 50V 04222 DG015E104Z A1C938 283 0421 00 CAP FXD CER DI 0 1UF 80 20 50V 04222 DG015E104Z A1C940 283 0421 00 CAP FXD CER DlrO lUF 80 20 50V 04222 DG015E104Z A1C943 283 0421 00 CAP FXD CER DlrO lUF 80 20 50V 04222 DG015E104Z A1C956 281 0773 00 CAP FXD CER Dl 0 01UF 10 100V 04222 SA201C103KAA A1C957 290...

Page 175: ...EMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A1CR652 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A1CR653 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A1CR707 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A1CR741 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A1CR746 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A1CR747 152 0...

Page 176: ...TOR SILICON NPN 07263 S032677 A1Q624 151 1042 01 SEMICOND DVC SE FET SI TO 92 04713 O BD A1Q645 151 0188 00 TRANSISTOR SILICON PNP 04713 SPS6868K A1Q700 151 0190 00 TRANSISTOR SILICON NPN 07263 S032677 A1Q709 151 0736 00 TRANSISTOR SILICON NPN 04713 SPS8317 A1Q741 151 0188 00 TRANSISTOR SILICON PNP 04713 SPS6868K A1R100 315 0474 00 RES FXD CMPSN 470K OHM 5 0 25W 01121 CB4745 IN C O M B O W C100 Al...

Page 177: ...5 A1R217 321 0268 00 RES FXD F1LM 6 04K OHM 1 0 125W 91637 MFF1816G60400F A1R218 321 0210 00 RES FXD FILM 1 5K OHM 1 0 125W 91637 MFF1816G15000F A1R219 321 0354 00 RES FXD FILM 47 5K OHM 1 0 125W 91637 MFF1816G47501F A1R220 315 0100 00 RES FXD CMPSN 10 OHM 5 0 25W 01121 CB1005 A1R223 315 0622 00 RES FXD CMPSN 6 2K OHM 5 0 25W 01121 CB6225 A1R225 301 0361 00 RES FXD CMPSN 360 OHM 5 0 50W 01121 EB36...

Page 178: ...M 40 2K OHM 1 0 125W 91637 MFF1816G40201F A1R482 315 0471 00 RES FXD CMPSN 470 OHM 5 0 25W 01121 CB4715 A1R483 321 0347 00 RES FXD FILM 40 2K 0HM 1 0 125W 91637 MFF1816G40201F A1R484 315 0202 00 RES FXD CMPSN 2K OHM 5 0 25W 01121 CB2025 A1R485 315 0202 00 RES FXD CMPSN 2K OHM 5 0 25W 01121 CB2025 A1R486 321 0347 00 RES FXD FILM 40 2K OHM 1 0 125W 91637 MFF1816G40201F A1R487 321 0130 03 RES FXD FIL...

Page 179: ... FXD CMPSN 10 OHM 5 0 25W 01121 CB1005 A1R638 311 1137 00 RES VAR NONWIR 5K OHM 20Z 0 50W 73138 72PX 67 0 502M A1R639 311 2099 00 RES VAR NONWIR TRMR 500 OHM 10Z 0 5W 73138 72 266 0 IN SERIES W W639 A1R642 315 0432 00 RES FXD CMPSN 4 3K OHM 5 0 25W 01121 CB4325 A1R643 315 0750 00 RES FXD CMPSN 75 OHM 5 0 25W 01121 CB7505 A1R644 315 0472 00 RES FXD CMPSN 4 7K OHM 5Z 0 25W 01121 CB4725 A1R645 321 06...

Page 180: ...RES FXD CMPSN 270 OHM 5 0 25W 01121 CB2715 A1R823 321 0193 00 RES FXD FILM IK OHM 1 0 125W 91637 MFF1816G10000F A1R839 321 0147 00 RES FXD FILM 332 OHM 1 0 125W 91637 MFF1816G332R0F A1R850 311 1137 00 RES VAR NONWIR 5K OHM 20 0 50W 73138 72PX 67 0 502M A1R852 315 0240 00 RES FXD CMPSN 24 OHM 5 0 25W 01121 CB2405 A1R853 315 0240 00 RES FXD CMPSN 24 OHM 5 0 25W 01121 CB2405 A1R855 315 0103 00 RES FX...

Page 181: ...ER 80009 155 0241 01 A1U850 156 0515 02 MICROCIRCUIT DI TRIPLE 3 CHANMUX SEL 80009 156 0515 02 A1U860 156 0515 02 MICROCIRCUIT DI TRIPLE 3 CHANMUX SEL 80009 156 0515 02 A1U910 156 1191 01 MICROCIRCUIT LI DUAL Bl FET OP AMP 8 DIP 01295 TL072ACP3 A1U975 156 0382 02 MICROCIRCUIT DI QUAD 2 INP NAND GATE 01295 SN74LS00 A1U980 156 0479 02 MICROCIRCUIT DI QUAD 2 INP ORGATE 01295 SN74LS32NP3 A1VR125 152 0...

Page 182: ... A2CR1011 152 0750 00 SEMICOND DEVICE RECT BRIDGE 600V 3A 80009 152 0750 00 A2CR1220 152 0066 00 SEMICOND DEVICE SILICON 400V 750MA 14433 LG4016 A2CR1221 152 0066 00 SEMICOND DEVICE SILICON 400V 750MA 14433 LG4016 A2CR1241 152 0066 00 SEMICOND DEVICE SILICON 400V 750MA 14433 LG4016 A2CR1242 152 0066 00 SEMICOND DEVICE SILICON 400V 750MA 14433 LG4016 A2CR1243 152 0066 00 SEMICOND DEVICE SILICON 400...

Page 183: ...21 CB4745 A2R1018 301 0300 00 RES FXD CMPSN 30 OHM 5 0 50W 01121 EB3005 A2R1204 315 0103 00 RES FXD CMPSN 10K OHM 5 0 25W 01121 CB1035 A2R1208 315 0471 00 RES FXD CMPSN 470 OHM 5 0 25W 01121 CB4715 A2R1212 315 0393 00 RES FXD CMPSN 39K OHM 5 0 25w 01121 CB3935 A2R1220 304 0822 00 RES FXD CMPSN 8 2K OHM 10 1W 01121 GB8221 A2R1221 315 0100 00 RES FXD CMPSN 10 OHM 5Z 0 25W 01121 CB1005 A2R1222 315 01...

Page 184: ...1 CB1035 A2R1351 315 0202 00 RES FXD CMPSN 2K OHM 5 0 25W 0 1 1 2 1 CB2025 A2R1352 301 0150 00 RES FXD CMPSN 15 OHM 5Z 0 50W 0 1 1 2 1 EB1505 A2R1353 301 0150 00 RES FXD CMPSN 15 OHM 5 0 50W 0 1 1 2 1 EB1505 A2R1354 315 0222 00 RES FXD CMPSN 2 2K OHM 5 0 25W 0 1 1 2 1 CB2225 A2R1355 315 0682 00 RES FXD CMPSN 6 8K OHM 5Z 0 25W 0 1 1 2 1 CB6825 A2R1356 315 0512 00 XB010185 RES FXD CMPSN 5 IK OHM 5 0...

Page 185: ...250UF 100 10 20V 56289 672D257H0200M5C A3C1112 290 0782 00 CAP FXD ELCTLT 4 7UF 75 10 35V 55680 35ULA4R7V T A3C1113 290 0798 00 CAP FXD ELCTLT 180UF 100 10 40V 56289 672D187H040DM5C A3C1114 290 0800 00 CAP FXD ELCTLT 250UF 100 10 20V 56289 672D257H0200M5C A3C1115 290 0800 00 CAP FXD ELCTLT 250UF 100 10 20V 56289 672D257H0200M5C A3C1116 290 0798 00 CAP FXD ELCTLT 180UF 100 10 40V 56289 672D187H040D...

Page 186: ... RES FXD CMPSN 10K OHM 5Z 0 25W 01121 CB1035 A3R1018 315 0394 00 RES FXD CMPSN 390K OHM 5 0 25W 01121 CB3945 A3R1019 315 0394 00 RES FXD CMPSN 390K 0HM 5Z 0 25W 01121 CB3945 A3R1020 301 0274 00 RES FXD CMPSN 270K OHM 5 0 50W 01121 EB2745 A3R1021 315 0103 00 RES FXD CMPSN 10K OHM 5Z 0 25W 01121 CB1035 A3R1022 315 0104 00 RES FXD CMPSN 100K OHM 5X 0 25W 01121 CB1045 A3R1023 315 0122 00 RES FXD CMPSN...

Page 187: ...R1129 315 0474 00 RES FXD CMPSN 470K OHM 5 0 25W 01121 CB4745 A3RL1060 108 0329 00 COIL RF 2 5UH 80009 108 0329 00 A3T1020 120 1449 00 XFMR COM MODE 02113 P104 A3T1050 120 1417 00 XFMR RF POWER HIGH FREQUENCY 80009 120 1417 00 A3T1060 120 1437 00 XFMR PW R STPDN 80009 120 1417 00 A3U1029 156 0885 00 MICROCIRCUIT L1 OPTOELECTRONIC ISOLATOR 04713 S0C123A A3U1030 156 1627 00 MICROCIRCUIT LI POWER WID...

Page 188: ...5W 91637 MFF1816D12001C A4R2905 321 0816 03 RES FXD FILM 5K OHM 0 25 0 125W 91637 MFF1816D50000C A4R2910 321 0685 00 RES FXD FILM 30K OHM 0 5Z 0 125W 91637 MFF1816D30001D A4R2911 321 0685 00 RES FXD FILM 30K OHM 0 5Z 0 125W 91637 MFF1816D30001D A4R2912 315 0102 00 RES FXD CMPSN IK OHM 5 0 25W 01121 CB1025 A4R2913 321 0198 00 RES FXD FILM 1 13K OHM 1 0 125W 91637 MFF1816G11300F A4R2914 321 0306 00 ...

Page 189: ... 160 1631 00 MICROCIRCUIT DI 4096 X 8 EPROM 80009 160 1631 00 A4U2935 156 0956 02 MICROCIRCUIT DI OCTAL BFR W 3STATE OUT 01295 SN74LS244NP3 A4U2940 156 1172 01 MICROCIRCUIT DI DUAL 4 BIT CNTR BURN IN 01295 SN74LS393 A4U2950 156 0388 03 MICROCIRCUIT DI DUAL D FLIP FLOP 07263 74LS74A A4U2960 156 0796 01 MICROCIRCUIT DI 8 STG SHF STORE BUS RGTR 80009 156 0796 01 A4U2965 156 0382 02 MICROCIRCUIT DI QU...

Page 190: ...104MAA A5C2527 281 0775 00 CAP FXD CER D I 0 1UF 20 50V 59660 SA205E104MAA A5C2530 283 0423 00 CAP FXD CER DI 0 22UF 80 20 50V 04222 DG015E224Z A5C2536 281 0775 00 CAP FXD CER D I 0 1UF 20 50V 59660 SA205E104MAA A5C2540 283 0423 00 CAP FXD CER DI 0 22UF 80 20 50V 04222 DG015E224Z A5C2542 283 0423 00 CAP FXD CER DI 0 22UF 80 20 50V 04222 DG015E224Z A5C2550 281 0775 00 CAP FXD CER D I 0 1UF 20 50V 5...

Page 191: ...5 0103 00 RES FXD CMPSN 10K OHM 5 0 25W 01121 CB1035 A5R2227 321 0289 02 RES FXD FILM 10K OHM 0 5Z 0 125W 91637 CMF55 116D10001D A5R2228 321 0289 02 RES FXD FILM 10K OHM 0 5Z 0 125W 91637 CMF55 116D10001D A5R2229 321 0431 00 RES FXD FILM 301K OHM 1Z 0 125W 91637 MFF1816G30102F A5R2230 315 0103 00 RES FXD CMPSN 1OK OHM 5Z 0 25W 01121 CB1035 A5R2241 315 0101 00 RES FXD CMPSN 100 OHM 5Z 0 25W 01121 C...

Page 192: ... 00 RES FXD CMPSN 10K OHM 5Z 0 25W 01121 CB1035 A5R2516 315 0103 00 RES FXD CMPSN 10K OHM 5Z 0 25W 01121 CB1035 A5R2517 315 0103 00 RES FXD CMPSN 10K OHM 5X 0 25W 01121 CB1035 A5R2518 315 0103 00 RES FXD CMPSN 10K OHM 5Z 0 25W 01121 CB1035 A5R2519 315 0103 00 RES FXD CMPSN 10K OHM 5 0 25W 01121 CB1035 A5R2520 315 0103 00 RES FXD CMPSN 10K OHM 5 0 25W 01121 CB1035 A5R2521 315 0103 00 RES FXD CMPSN ...

Page 193: ...5 PH BRZ G O LD 22526 47357 A5TP510 131 0608 00 TERMINAL PIN 0 365 L X 0 025 PH BRZ G O LD 22526 47357 A5TP511 131 0608 00 TERMINAL PIN 0 365 L X 0 025 PH BRZ G O LD 22526 47357 A5U2008 156 1566 00 MICROCIRCUIT DI EPROM 100 X 14 80009 156 1566 00 A5U2034 156 0865 02 MICROCIRCUIT DI OCTAL D TYPE FF W CLEAR 01295 SN74LS273NP3 A5U2092 156 1342 01 MICROCIRCUIT DI MPU 8 BIT W CLK 07263 F68A08 P O R D A...

Page 194: ...CNTR BURN IN 04713 A5U2770 156 0469 02 MICROCIRCUIT DI 3 8 LINE DCDR 01295 A5VR2003 152 0127 00 SEMICOND DEVICE ZENER 0 4W 7 5V 5 04713 A5VR2526 152 0278 00 SEMICOND DEVICE ZENER 0 4W 3V 5 04713 A5W2143 131 0566 00 BU S CONDUCTOR DUMMY RES 2 375 22 A W G 57668 A5W2526 131 0566 00 BU S CONDUCTOR DUMMY RES 2 375 22 A W G 57668 A5Y2568 158 0248 00 XTAL UNIT QTZ 10MHZ 0 01 SERIES 80009 Mfr Part Number...

Page 195: ...4152R A6CR3175 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A6CR3176 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A6CR3177 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A6CR3178 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A6CR3179 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A6CR3180 152 0141 02 SEMICOND DEVICE SILICON 30V ...

Page 196: ...0 0 5W 32997 91Z2D Z45 EA0021 A6R3210 311 2180 00 RES VAR NONWW LINEAR 2K OHM 30 0 5W 32997 91Z1A Z45 EA0019 A6R3300 315 0151 00 RES FXD CMPSN 150 OHM 5 0 25W 01121 CB1515 A6R3310 315 0151 00 RES FXD CMPSN 150 OHM 5 0 25W 01121 CB1515 A6R3325 315 0151 00 RES FXD CMPSN 150 OHM 5 0 25W 01121 CB1515 A6R3326 315 0151 00 RES FXD CMPSN 150 OHM 5 0 25W 01121 CB1515 A6R3327 315 0151 00 RES FXD CMPSN 150 O...

Page 197: ...36 EA0024 A7R3475 311 2183 00 RES VAR NONWW LINEAR 5R OHM 30 0 5W 32997 91ZID Z36 EA0024 A8 670 7280 00 CRT BO ARD ASSY SCALE ILLUMINATION 80009 670 7280 00 A8DS90 150 0030 00 LAMP GLOW NEON T 2 60 TO 90 VOLTS SUBPART OF HV M ODULE 152 0805 00 74276 NE2V T A8DS91 150 0030 00 LAMP GLOW NEON T 2 60 TO 90 VOLTS SUBPART OF HV M ODULE 152 0805 00 74276 NE2V T A8DS100 150 0057 01 LAMP INCAND 5V 0 115A W...

Page 198: ...SEMICOND DEVICE SILICON 175V 100MA 07263 FDH2161 A9CR1951 152 0787 00 SEMICOND DEVICE RECT S I 12KV 3MA A LZV OOOJF ESJA25 12 A9CR1953 152 0061 00 SEMICOND DEVICE SILICON 175V 100MA 07263 FDH2161 A9CR1990 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 01295 1N4152R A9L1974 108 0318 00 COIL RF CMPSN 100 OHM 5 0 25W 32159 81000M A9Q1851 151 0443 00 TRANSISTOR SILICON PNP 04713 SPS7950 A9Q1852 151 044...

Page 199: ...163 00 RES FXD CMPSN 16K OHM 5Z 0 25W 01121 CB1635 A9R1945 321 0385 07 RES FXD FILM 100K OHM 0 1Z 0 125W 91637 MFF1816C10002B A9R1950 315 0103 00 RES FXD CMPSN 10K OHM 5Z 0 25W 01121 CB1035 A9R1951 315 0220 00 RES FXD CMPSN 22 OHM 5Z 0 25W 01121 CB2205 A9R1952 315 0202 00 RES FXD CMPSN 2K 0HM 5Z 0 25W 01121 CB2025 A9R1953 315 0393 00 RES FXD CMPSN 39K 0HM 5Z 0 25W 01121 CB 3935 A9R1971 315 0202 00...

Page 200: ...EVICE SILICON 30V 150MA 01295 1N4152R A10CR1699 152 0141 02 SEMICOND DEVICE SILICON 30V 1SO M A 01295 1N4152R A10Q1698 151 0301 00 TRANSISTOR SILICON PNP 27014 2N2907A A10R1691 303 0150 00 RES FXD CMPSN 15 0HM 5 1W 01121 GB1505 A10R1692 321 0062 00 RES FXD FILM 43 2 OHM 1 0 125W 91637 CMF55 116G43R20F A10R1693 323 0155 00 RES FXD FILM 402 OHM 1 0 50W 75042 CECT0 4020F A10R1694 323 0155 00 RES FXD ...

Page 201: ... 0 125W 91637 MFF1816G88700F A14R3405 315 0750 00 RES FXD CMPSN 75 OHM 5 0 25W 01121 CB7505 A14R3406 315 0123 00 RES FXD CMPSN 12K OHM 5 0 25W 01121 CB1235 A14R3407 311 1137 00 RES VAR NONWIR 5K OHM 20 0 50W 73138 72PX 67 0 502M A14R3408 321 0284 00 RES FXD FILM 8 87K OHM 1 0 125W 91637 MFF1816G88700F A14R3409 315 0222 00 RES FXD CMPSN 2 2K OHM 5 0 25W 01121 CB2225 A14R3410 315 0103 00 RES FXD CMP...

Page 202: ...0 5W LINEAR 12697 CM43515 R351 311 1428 00 RES VAR NONWIR 20K 0HM 1W 01121 10M959 R352 311 1428 00 RES VAR NONWIR 20K OHM lW 01121 10M959 R975 311 2174 00 RES VAR NONWIR 5 OHM 20Z 0 5W LINEAR 12697 CM43515 R976 311 2174 00 RES VAR NONWIR 5 OHM 20 0 5W LINEAR 12697 CM43515 R977 311 2174 00 RES VAR NONWIR 5 OHM 20Z 0 5W LINEAR 12697 CM43515 S90 260 1967 00 SWITCH SLIDE DPDT 5A 250V SUBPART OF 672 10...

Page 203: ...e circuit board outline on the diagram inthe title for the circuit board component location illustration and in the lookup table for the schematic diagram and corresponding component locator illustration The Replaceable Electrical Parts list isarranged by assemblies in numerical sequence the components are listed by component number see following illustration for constructing a component number Th...

Page 204: ...der 10 pF BLACK 0 1 1 20 2 pF 4 VDC BROWN 1 10 1 10 1 0 1 pF 6 VDC RED 2 102 or 100 2 102 or 100 2 10 VDC ORANGE 3 103 or 1 K 3 103 or 1000 3 15 VDC YELLOW 4 104 or 10 K 14 104 or 10 000 100 9 20 VDC GREEN 5 10S or 100 K A 10s or 100 000 5 0 5 pF 25 VDC BLUE 6 106 or 1 M V4 106 or 1 000 000 35 VDC VIOLET 7 1 10 50 VDC GRAY 8 10 2 or 0 01 80 20 0 25 pF WHITE 9 10 1 or 0 1 10 1 pF 3 VDC GOLD 1 0 1 o...

Page 205: ...r Filtered Voltage Refer to Diagram N um ber Schem atic Name and Num ber COLOR CODE Q a n d multiplier 1st 2nd and 3rd significant figures tolerance CERAMIC CAPACITORS Td temperature coefficient polarity and voltage rating and or color code may not be present on some capacitors COLOR SIGNIFICANT FIGURES RESISTORS CAPACITORS DIPPED TANTALUM VOLTAGE RATING MULTIPLIER TOLERANCE MULTIPLIER TOLERANCE o...

Page 206: ...RANSISTORS SHORT LEADS LARGE ARE CATHODES FLAT PACK ____________ j 1 ___ LED_____ TRANSISTORS BARS INTEGRATED CIRCUITS 3 TERMINAL REGULATORS POWER FETS LEAD CONFIGURATIONS AND CASE STYLES INSTRUMENT MODIFICATIONS Figure 9 2 Semiconductor lead configurations ...

Page 207: ...ation In the circuit board location illustration determine the location of the circuit board in the instrument Find the circuit board in the instrument and compare it with its illustration in the manual to locate the desired component on the board C670 Q670 R677 C671 Q672 R679 C673 Q673 R680 C680 C681 R671 U61 7 P603 R673 U618 P607 R674 U619 Q669 R675 CRT CIRCUIT DIAGRAM MANUAL BINDER ASSEMBLY NUM...

Page 208: ...on and Component diagram determine the Assembly t board on which the component is ation is boxed and located in a corner t distinguishes the board outline it Location Table for the Assembly led andfindthe Circuit Number of the LOCATION column read the grid esired component A6 ASSEMBLY CIRCUIT SCHEM BOARD CIRCUIT SCHEM BOARD NUMBER LOCATION LOCATION NUMBER LOCATION LOCATION C602 r 3C Q656 2F 2B C60...

Page 209: ...er the SCHEM LOCATION column read the grid coordinates for the desired component d Using the Circuit Number and grid coordinates locate the component on the schematic diagram b Scan the Component Location Table adjacent to the schematic diagram and find the Circuit Number of the desired component PULL OUT PAGE TABS FOR SCHEMATIC DIAGRAMS SCHEMATIC DIAGRAM NAME AND NUMBER To identify any component ...

Page 210: ...3829 58 Figure 9 4 2445 block diagram ...

Page 211: ...ed Chass amounted components have no Assembly N u ber ij or x 50p g n r j n R e p f a r j e a r s L s L LABELED ON SOME BOARDS AS P VICE J COMPONENTS WITHIN PARENTHESES MAY NOT BE LOCATED PRECISELY AS SHOWN BUT ARE NEAR THEIR INDICATED POSITION t INDICATES COMPONENTS THAT WERE MANUALLY ADDED TO THE BOARD AS A RESULT OF MODIFICATION ...

Page 212: ...er if used Schematic Circuit Number Chassis mounted components have no Assembly Number prefix see end of Replaceable Electrical Parts List LABELED ON SOME BOARDS AS P VICE J COMPONENTS WITHIN PARENTHESES MAY NOT BE LOCATED PRECISELY AS SHOWN BUT ARE NEAR THEIR INDICATED POSITION t INDICATES COMPONENTS THAT WERE MANUALLY ADDED TO THE BOARD AS A RESULT OF MODIFICATION ...

Page 213: ... waveforms below were obtained at the test points indicated on the accompanying schematic diagram and board dolly The waveforms are representative of signals that may be expected at the associated points whenever the instrument is running 3829 50 ...

Page 214: ......

Page 215: ...R2113 2 R2509 2 TP510 1 U2556 1 C2540 2 R2123 2 R2510 2 TP511 1 U2556 1 C2542 2 R2127 2 R2511 2 U2008 2 U2556 1 C2550 1 R2140 2 R2512 2 U2008 2 U2556 1 C2565 1 R2141 2 R2513 2 U2034 2 U2556 1 C2566 1 R2142 2 R2514 2 U2034 12 U2556 1 C2572 1 R2143 2 R2515 2 U2092 1 U2556 12 C2575 12 R2144 2 R2516 2 U2092 12 U2580 1 C2586 12 R2145 2 R2517 2 U2108 2 U2580 12 C2637 12 R2162 1 R2518 2 U2108 12 U2596 1 ...

Page 216: ... reference voltages Test point locations and setup information are called out on the illustration _ i u u to LU LU _ l _ i 0 O _ l cz _ l tz O O Ll u 0 L i 00 00 2 SC M O 5 0 Q l C M t H 1 t CZ I O O X X X X 00 00 X X u 0 0 u S r ji_n_iuu s S s s _ I I Ll a l l Ll Ll Ll Ll Ll Q LU LU UJ UJ LU LU UJ U l LU to O cr oz O a Q1 a in CM U CM U V V V X O 1 i J 1 1 _J j 1 a O 0 a a Q O a a 1 L_n_Ji_rL_n_n...

Page 217: ......

Page 218: ... 9B 3H U2092 5D 1G R2288 8B 3H U2118A 7B 3E W512 7P 4H R2297 9B 3H U2162 6H 2K R2298 8A 3H U2178 6F 1J Y2568 4B 4H Partial A5 also shown on diagrams 2 and 12 ACRONYM DICTIONARY The following listing explains some of the less obvious acronyms and signal labels used on this schematic Acronyms and labels not shown in this listing may be included in the circuit descriptions Section 3 and should be obv...

Page 219: ...2445 382 72 ...

Page 220: ...D LOCATION 2H 2H 2E 3H 3H 3J 2J 3E 4J 4J 4K 3K 3J 3J 3J 3J 3J 3J 4J 3K 4G 4G 4G 4G 4G 3J 4H 4H me i 1 address 0900 hex 2 address 0940 hex ed atus strobe ex ex hex 09CF hex 2445 PROCESSOR AND DIGITAL CONTROL ...

Page 221: ...B 2A R2312 2F 3D R2539 8N 4E U2427D 5N 3C R2313 4F 3D R2540 7L 4D U2435A 9M 3E P501 7G 3B R2314 2J 3C R2541 7L 4D U2435B 9L 3E P511 4A 4C R2315 2J 3C R2542 9L 4E U2435D 8N 3E P511 6S 4C R2316 2J 3C R2543 9L 4E U2456 5J 3B P511 9A 4C R2317 4J 3D R2545 5G 2A U2634A 7M 4D P512 10S 4H R2319 4J 2D R2546 5H 2A U2634B 8L 4D P512 1A 4H R2320 5J 2D R2547 5H 2B P512 4S 4H R2324 6K 3C R2609 3D 4B VR2003 IK 4...

Page 222: ...2445 ...

Page 223: ... 3E 1L 3E 8D IB 2D 2E 5K 2D 7J 2B 3H 2F 8K 3D 4F 3A 5F 3B 6M 3C 3 6L 3C 7N 3C 5N 3C V 9M 3E i 9L 3E 8N 3E 5J 3B V 7M 4D t 8L 40 1 IK 4F 1 6N 4A 10B 4C 5B 4C 9P 4C 10P 4H IB 4H 5P 4H olexer 0 inhibit exer 1 address bit 0 exer 1 address bit 1 exer 1 address bit 2 xer input oit ck it output 3 code bit 1 co d e bit 2 3 code bit 3 ihibit 3819 73 ANALOG CONTROL ...

Page 224: ...ervice COMPONENTS WITHIN PARENTHESES MAY NOT BE LOCATED PRECISELY AS SHOWN BUT ARE NEAR THEIR INDICATED POSITION ALL COMPONENTS MOUNTED ON A7 FRONT PANEL VARIABLE CIRCUIT BOARD ARE SHOWN ON SCHEMATIC DIAGRAM ...

Page 225: ... 3 CR3025 3 DS3311 3 R3075 3 S3110 3 CR3030 3 DS3312 3 R3100 3 S3110 3 CR3031 3 DS3313 3 R3125 3 S3175 3 CR3032 3 DS3314 3 R3150 3 S3175 3 CR3033 3 DS3325 3 R3190 3 S3200 3 CR3035 3 DS3326 3 R3200 3 S3210 3 CR3050 3 DS3327 3 R3210 3 S3220 3 CR3075 3 DS3329 3 R3300 3 S3250 3 CR3105 3 DS3330 3 R3310 3 S3260 3 CR3110 3 DS3331 3 R3325 3 S3270 3 CR3115 3 DS3350 3 R3326 3 U3300 3 CR3120 3 DS3351 3 R3327...

Page 226: ...R3025 3 DS3311 3 R3075 3 S3110 3 CR3030 3 DS3312 3 R3100 3 S3110 3 CR3031 3 DS3313 3 R3125 3 S3175 3 CR3032 3 DS3314 3 R3150 3 S3175 3 CR3033 3 DS3325 3 R3190 3 S3200 3 CR3035 3 DS3326 3 R3200 3 S3210 3 CR3050 3 DS3327 3 R3210 3 S3220 3 CR3075 3 DS3329 3 R3300 3 S3250 3 CR3105 3 DS3330 3 R3310 3 S3260 3 CR3110 3 DS3331 3 R3325 3 S3270 3 CR3115 3 DS3350 3 R3326 3 U3300 3 CR3120 3 DS3351 3 R3327 3 U...

Page 227: ...l o o a c O CHOP MV M O 19 P601A 1 1 2 C 3 4 S32B0 i CPU S A S MO0E_ Z f t I n ul s m m m 6 mAmm r B S30WT A n POS CH 4 CH 3 AP871 T u T 21 9 m 1 8 2 CK mm CM A 3829 61 Figure 9 7 Circuit view of A6 Front Panel Static Sensitive Devices See Maintenance Section COMPONENT NUMBER EXAMPLE Component Number Assembly Number A23 A2 R1234 I I Schematic 1 Circuit Subassembly Number Number if used Chassis mou...

Page 228: ...ENTS MOUNTED ON A8 SCALE ILLUMINATION CIRCUIT BOARD ARE SHOWN ON SCHEMATIC DIAGRAM 4 COMPONENTS W ITHIN PARENTHESES MAY NOT BE LOCATED PRECISELY AS SHOWN BUT ARE NEAR THEIR INDICATED POSITION t INDICATES COMPONENTS THAT WERE MANUALLY ADDED TO THE BOARD AS A RESULT OF M ODIFICATION LABELED ON SOME BOARDS AS P VICE J COMPONENT ON BACK OF BOARD USED FOR FUTURE TV OPTION Static Sensitive Devices See M...

Page 229: ... 4 C l 84 4 C938 1 1 J1 14 8 Q700 1 1 R453 4 C185 4 C940 1 1 J115 8 Q709 5 R454 4 C200 4 C943 1 1 J 116 5 Q741 5 R455 4 C202 4 C956 6 J117 4 R100 4 R456 4 C203 4 C957 6 J118 5 R101 4 R457 4 C205 4 C958 1 1 J 119 1 1 R102 4 R458 4 C206 4 C966 1 1 J 181 4 R114 4 R459 4 C207 1 1 C972 6 J 191 6 R115 4 R460 4 C217 4 C973 1 1 J191 1 1 R 117 4 R461 4 C218 1 1 C975 8 J191 1 1 R118 4 R462 4 C219 1 1 C988 1...

Page 230: ...D DS3350 8J 2E R3325 8L 2F S3260 5J 3E CR3175 2F 3D DS3351 8K 2E R3326 9N 3E S3270 1A 3E CR3176 2F 2C DS3352 8K 2E R3327 9P 3E CR3177 2F 2C DS3353 8L 2E R3350A 9N 2E U3300 8B 4B CR3178 2G 3C DS3354 8L 3E R3350B 9M 2E U3325 9E 3C CR3179 2G 3C DS3375 9M 2E R3350C 8M 2E U3350 9H 2F CR3180 5F 3C DS3376 9M 2E R3350D 7J 2E U3375 10L 3D CR3181 6F 4D DS3377 9N 2E R3350E 10P 2E CR3182 6F 4B DS3378 9N 2E R3...

Page 231: ...A 1 t C t t F t G t H t ...

Page 232: ...B 3N 2B 3L 2A 3D 2B 3K 2B 3L 2B 3D 3A 18 4A 4D 3B 2C 4B 2B 4D 2A 4E 4J ID 4M 2C 4L 2C 4K 2D 3H 3C 5H 3C 3J ID 4N 2E 5L 2D 5K 3D 5J 3E 1A 3E 8B 4B 9E 3C 9H 2F 10L 3D 8S 3F 10A 2A 3S 2A SCHEM BOARD LOCATION LOCATION SCHEM BOARD LOCATION LOCATION ...

Page 233: ......

Page 234: ...800 6 U450 11 R801 6 U475 6 R802 6 U475 6 R803 6 U475 6 R804 6 U475 6 R805 6 U475 6 R806 6 U485 6 R809 6 U485 6 R811 1 1 U485 6 R817 6 U485 6 R820 6 U485 6 R821 6 U500 5 R822 6 U500 11 R823 6 U550 5 R850 6 U550 5 R852 5 U550 5 R853 5 U550 5 R855 6 U550 5 R856 6 U600 6 R858 6 U600 11 R860 6 U650 5 R904 5 U650 11 The following listing explains some of the less obvious acronyms and signal labels used...

Page 235: ... MODE AUTO via a BNC T connector a 50 ohm BNC cable and a dual SOURCE VERT input coupler COUPLING DC Set VERTICAL MODE Input Coupling CH 1 and CH 2 VOLTS DIV CH 1 and CH 2 A and B SEC DIV CH 1 1 M ft DC 50 mV 0 5 ms knobs locked 0 O 0 0 0 0 All other control settings are irrelevant TEST OSCILLOSCOPE SETUP Connect the 200 mV 1 kHz squarewave from the BNC T connector to the External Trigger input of...

Page 236: ......

Page 237: ...8P 3E R198 9M 3F U130G 6B 6C C464 8S 3E LR180 2N 4E R199 9M 3F U140 5D 7B LR280 7N 3E R200 8H 3C U150 6D 7C CR100 1J 5C R201 8H 3B U160A 2L 2D CR101 1J 5C P100A 2T 4F R202 8H 3B U160B 6L 2D CR130 6C 7B P100D 7T 4F R216 7L 3D U160C 7K 2D CR131 6C 7B P I 03 8L 4C R217 7K 3D U160D IK 2D CR140 4G 6B R218 7K 3E U165A 8M 2F CR141 4F 6B Q130 6C 7B R219 7L 3D U170 4J 2E CR142 4F 6B Q131 6C 7B R223 3C 2H U...

Page 238: ...2445 392 1 75 ...

Page 239: ...3E 8S 3E 8P 3F 3B 1G 2M 5D 4E 6B 6E 6C 5G 6C 5G 6C 5K 6C 5M 6C 5M 6C 4M 6C 66 6C 5D 7B 6D 7C 2L 2D 6L 2D 7K 2D IK 2D 8M 2F 4J 2E 7M 4D 10M 2B 7P 3F 2P 3F 7L 2D 1L 2D 3J 2E SC HEM BO A RD LO C A T IO N LO C A TIO N 5S IP SC HEM BO A R D LO C A TIO N LO C A TIO N SC HEM BO A RD LO C A TIO N LO CA TIO N 5N C H A S S IS ATTENUATORS PREAMPS ...

Page 240: ...ect a 200 mV 1 kHz squarewave to the CH 1 input of the 2445 using a BNC cable Set VERTICAL MODE Input Coupling CH 1 and CH 2 VOLTS DIV CH 1 and CH 2 CH 1 and CH 2 VAR A and B SEC DIV A and B SEC DIV VAR TRIGGER MODE SOURCE COUPLING HOLDOFF SLOPE LEVEL CH 1 1 M ft DC 50 mV In detent 0 2 ms knobs locked In detent AUTO VERT NOISE REJ In detent plus Stably triggered display At A REF OR DLY POS INTENSI...

Page 241: ... EF SETTING B S W E E P 100ps IH O LD 0V I i A S W E E P 20t IH O LD 3ms 3 08 H O LD H O LD 5V B S W E E P O N LY TRIG G ERED 4V HOLDOFF H K 4V 3V n TRIG G ERED O N S W E E P h POSITIVE GOING RUNNING S Q U A R E W A V E n H O LD O FF 4V 3V TRIG D B S W E E P O N LY B TRIG G ERED 0V 3 m 8 H HOLDC A S W E E P 200 ...

Page 242: ...LD O FF 5V 0V 2 4ms 3ms 4 5V 0V 0 2 V h H VARIES W A S W E E P 200ps A REF SETTING B S W E E P 100ms 2 6V 0 2V 3ffl8 4V m 2 4m 8 HOLDOFF H K 4V 3V 1 n TRIG G ERED O N U SWEEP POSITIVE GOING RUNNING1 S Q U A R E W A V E 3m s 4V 3V 3ms H H O LD O FF i n TRIC D B S W E E P O N LY B TRIG G ERED ...

Page 243: ...D O FF S W E E P H O LD O FF S W E E P HO LD O FF SW EEP B S W E E P ONLY TRIG G ERED AFTER 0ps DELAY O N SLOPE 3ms H H O LD O FFIS W E E P l A S W E E P 200ms B S W E E P 100ms 0 4m8 U m 0 4ms 0 4ms j H B 2M8 H AAAAA 5 V I V V V 3829 53 ...

Page 244: ......

Page 245: ...g current ITF timing current feedback ITR timing current reference ITREF timing current reference ITRR timing current reference return IZD inhibit zero delay RDA reset delay adjust ROA readout acknowledge ROB readout blank ROI readout intensity RO ON readout on ROR readout request SDO sweep delay offset SG sweep gate SGA sweep gate A SGAZ sweep gate A to Z axis SGB sweep gate B SGBZ sweep gate B t...

Page 246: ... 7B 1J U550C 8P IF C907 6M 7J R 52 3C 2F R669 5C 2J U550D 8N IF C908 5M 8J R153 3C 2F R670 2B 1J U550E 9P IF C912 5K 9E R154 4C 2E R671 2D 2H U650 6D 3J R155 3D 2F R672 2B 2H U700 3L 7D CR355 IP 7B R156 4C 2E R678 2B 2H U850B 6J 8F CR356 IP 7B R165 2H 2E R707 2N 8C U850C 3J 8F CR358 5B 7B R334 6B 9B R708 2N 8C U860A 3M 6F CR359 6B 8B R353 6B 2H R709 IN 8C U860B 2J 6F CR652 6E 4J R355 IP 7B R710 IK...

Page 247: ...A 1 C _____ D E F G H J 2445 3811 74 ...

Page 248: ...1 2 3 4 5 6 7 8 9 i o 2445 DISPLAY SEQUENCER TRIG GERING A4B SWEEPS ...

Page 249: ...ssembly Number A23A2R1234 Subassembly Number if used Schematic Circuit Number Chassis mounted components have no Assembly Number prefix see end of Replaceable Electrical Parts List Figure 9 9 A14 Dynamic Centering board ALL COMPONENTS MOUNTED ON A14 DYNAMIC CENTERING BOARD ARE SHOWN ON SCHEMATIC DIAGRAM 6 ...

Page 250: ...nd CH 2 1 M S I DC VOLTS DIV CH 1 and CH 2 50 mV CH 1 and CH 2 VAR In detent A and B SEC DIV 0 2 ms knobs locked A and B SEC DIV VAR In detent TRIGGER MODE AUTO SOURCE VERT COUPLING NOISE REJ HOLDOFF In detent SLOPE plus LEVEL Stably triggered display 3V Q t J W R EAD O U T ON SIGNAL CO NSTANTLY C H A N G E S 8V r u 8V _ J At A REF OR DLY POS INTENSITY DLY readout 1000 0 jus readout Midrange READO...

Page 251: ...e to the CH 1 input of the 2445 using a BNC cable At A REF OR DLY POS DLY readout 1000 0 jls readout Set VERTICAL MODE CH 1 Input Coupling CH 1 and CH 2 i ma d c VOLTS DIV CH 1 and CH 2 CH 1 and CH 2 VAR 50 mV In detent A and B SEC DIV 0 2 ms knobs locked A and B SEC DIV VAR In detent TRIGGER MODE SOURCE COUPLING HOLDOFF SLOPE LEVEL AUTO VERT NOISE REJ In detent plus Stably triggered display 3V pi...

Page 252: ...m V 100m V _ o 0V 1 50mV 30V 27V 22V 3 1 V 27V 2 4 V 4V m i a i i w 1 r r H r 1 25V f V 8 5 V 3m s cAMPLITUDE VA RIES W IN T E N S IT Y SETTING AMPLITUDE VA RIES W IN T E N S IT Y SETTING 0V B SWEEP MUST BE SELECTED 3829 54 ...

Page 253: ......

Page 254: ...A A compensation COMP B B compensation GA gain GADJ gain adjust HSA horizontal select A HSB horizontal select B I BIAS current reference ISRC current source MKL RC mean cathode loading RC MR EG mag registration Q GAIN quadrapole gain RO DO readout data out ROSFRAME readout subframe R A NDLYD read write delayed RO readout R0S1 readout strobe 1 ROS2 readout strobe 2 SGA sweep gate A SGAZ sweep gate ...

Page 255: ...484 3D 4K R804 6S 7F U975C 7H 6K DL100 2H 5K R485 4C 4K R805 6P 7F U980B 8H 6K R486 2C 4K R806 7S 7F U980C 7H 6K J191 8S 8K R487 2B 3K R809 5S 7F J411 10S IK R488 2B 3K R817 2B 6F W106 9B 7K J411 2B IK R489 2B 3K R820 6L 6E W141 7F 9K J511 4B ID R490 1C 3J R821 6L 6E W141 9C 9K J512 10B 1H R491 ID 3J R822 5B 6E W916 2S 7H J512 9S 1H R492 2E 3J R823 6M 8E W917 3S 7H R493 2D 3J R850 6L 8F W918 5S 7G...

Page 256: ...1 I i 2 3 4 5 6 7 8 9 10 C 1 0M H W ff ROSFRAMEfe M W D L Y D 1 OM I w U L IU T jBsnp uM Al MAIN BCAR E 2445 3 S Z 9 7 7 ...

Page 257: ... 8P 4D 7H 8H 7H 9B 7F 9C 2S 3S 5S 6S BOARD LOCATION 7K 7J 9K 9K 7K 5E 4J 4J 4J 4J 4J 3K 3K 3K 3K 3K 6H 7E 7E 7E 7E 7E 7F 8F 6F 8K 6K 6K 6K 6K 7K 9K 9K 7H 7H 7G 7G SCHEM LO C A TIO N BO A RD LO CA TIO N SCHEM LO C A TIO N BO A RD LO CA TIO N 7E 2B 5D 2A SCHEM LO C A TIO N BO A RD LO CA TIO N ...

Page 258: ...ED PRECISELY AS SHOWN BUT ARE NEAR THEIR INDICATED POSITION Component Number A23 A2 R1234 Assembly Number Subassembly Number it used Schematic Circuit Number Chassis mounted components have no Assembly Number prefix see end of Replaceable Electrical Parts list ...

Page 259: ... 7 U2880 7 U2970 7 C2970 12 R2975 7 U2880 12 U2970 7 C2980 12 R2985 7 U2885 7 U2970 7 C2990 12 U2800 7 U2885 7 U2970 12 J401 7 U2800 12 U2885 7 U2980 7 J402 7 U2805 7 U2885 12 U2980 7 P411 7 U2805 12 U2890 7 U2980 7 P411 7 U2810 7 U2890 7 U2980 7 P411 7 U2810 7 U2890 7 U2980 12 P411 12 U2810 7 U2890 7 U2985 7 R2805 12 U2810 7 U2890 12 U2985 12 R2830 7 U2810 12 U2900 7 U2990 7 R2841 7 U2820 7 U2900...

Page 260: ...12 R2975 7 U2880 12 U2970 7 C2980 12 R2985 7 U2885 7 U2970 7 C2990 12 U2800 7 U2885 7 U2970 12 J401 7 U2800 12 U2885 7 U2980 7 J402 7 U2805 7 U2885 12 U2980 7 P411 7 U2805 12 U2890 7 U2980 7 P411 7 U2810 7 U2890 7 U2980 7 P411 7 U2810 7 U2890 7 U2980 12 P411 12 U2810 7 U2890 7 U2985 7 R2805 12 U2810 7 U2890 12 U2985 12 R2830 7 U2810 12 U2900 7 U2990 7 R2841 7 U2820 7 U2900 7 U2990 7 R2842 7 U2820 ...

Page 261: ...indicated on the accompanying schematic diagram and board dolly The waveforms are representative of signals that may be expected at the associated points when the indicated setup conditions are observed W READOUT O N SIGN AL CONSTANTLY CHANGES 3V W READOUT O N SIGN AL CONSTANTLY CHANGES 3829 55 ...

Page 262: ...U2860 5F 2D U2980D 5E 2E R2920 4M 3B U2865 6D 2E U2985 8F 3E R2921 5M 3B U2870A 6F 2E U2990A 8E 3E R2922 5M 3B U2870B 5F 2E U2990B 9H 3E R2923 4M 3B U2880A 8J IE U2990C 9M 3E R2924 4M 3B U2880B 8P IE U2990D 8M 3E R2925 4M 3B U2885A 10H 2F U2995 9M 4E R2926 5M 4C U2885B 8J 2F R2927 2H 3C U2885C 8S 2F VR2925 4M 3C R2928 4L 4B U2890A 8B 2E R2929 4L 4B U2890B 9K 2E W411 10S 1A R2930 4M 4B U2890C 8L 2E...

Page 263: ... 0 2445 J8 i S ...

Page 264: ...1 2 3 4 5 6 7 i 8 I i 9 10 2445 READOUT ...

Page 265: ...y Number Number if used Chassis mounted components have no Assembly Number pre x see e d o Replaceable Electnca parts Lis ACRONYM DICTIONARY The following listing explains some of the less obvious acronyms and signal labels used on this schematic Acronyms and labels not shown in this listing may be included in the circuit descriptions Section 3 and should be obvious if a little thought is given to...

Page 266: ...820 6 R1945 8 C l 951 8 R1834 6 R1950 8 C l 971 8 R1842 6 R1951 8 C l 972 8 R1848 8 R1952 8 C l 973 8 R1853 8 R1953 8 C1980 8 R1854 8 R1971 8 C1990 8 R1855 8 R1972 8 C1991 8 R1856 8 R1973 8 CR1894 8 R1857 8 R1990 8 CR1895 8 R1858 8 R1991 8 CR1930 8 R1864 8 R1992 8 CR1950 8 R1870 8 R1994 8 CR1951 8 R1871 8 T1970 8 CR1953 8 R1872 8 U1830 8 CR1990 8 R1873 8 U1890 8 DS90 8 R1878 8 U1890 8 DS91 8 R1880...

Page 267: ...932 8 R1813 8 R1944 8 C l 950 8 R1820 6 R1945 8 C l 951 8 R1834 6 R1950 8 C l 971 8 R1842 6 R1951 8 C l 972 8 R1848 8 R1952 8 C l 973 8 R1853 8 R1953 8 C1980 8 R1854 8 R1971 8 C1990 8 R1855 8 R1972 8 C l 991 8 R1856 8 R1973 8 CR1894 8 R1857 8 R1990 8 CR1895 8 R1858 8 R1991 8 CR1930 8 R1864 8 R1992 8 CR1950 8 R1870 8 R1994 8 CR1951 8 R1871 8 T1970 8 CR1953 8 R1872 8 U1830 8 CR1990 8 R1873 8 U1890 8...

Page 268: ...est points indicated on the accompanying schematic diagram and board dolly The waveforms are representative of signals that may be expected at the associated points whenever the instrument is running 60V h 2 5 8 10V L AMPLITUDE WILL V AR Y B E TW E E N INSTRUM ENTS 2 w 78V 8 5V n n n ...

Page 269: ... R1892 3G 2E T1970 10B 3D C l 990 8D 3E Q1851 4F 1C R1893 3G 2E C1991 7E 4E Q1852 5F ID R1895 5S 1A U1830 8G 2B Q1890 3H IE R1896 5S 3A U1890A 8D 2E CR1894 8C IE Q1980 8E 3E R1897 3H IB U1890B 3G 2E CR1895 8B 2E Q1981 8B 3E R1898 4N IE U1956A 6C 4C CR1930 7E 4B R1910 6P 4A U1956B 6B 4C CR1950 7E 4C R1812 4F 2A R1911 6P 4A CR1951 7E 4C R1813 5F 1A R1920 7E 4B VR1891 5S 1A CR1953 7C 4C R1848 4N 1C R...

Page 270: ...I 1 2 3 I 4 5 6 7 8 9 10 A_ _ _ _j____B_ _ _ ____0_ _ _y ____D _ _ _j_ _ _E____ ____F_ _ _j____G _ _ _ ____H _ _ _y 2445 38Z 11 ...

Page 271: ...6C 6C 3G 8D 8E 8E 10B 8G 8D 3G 6C 6B 4B 4C 4C 4C 4C 4D 4D 4C 4D 4D 4D 3E 2E 3E 4E 3D 2B 2E 2E 4C 4C SCHEM LO C A TIO N BO A RD LO C A TIO N SCHEM LO C A TIO N 5B 6J 7J 7M 3J 4M 5P BO A RD LO C A TIO N C H A S S IS QLJ C H A S S IS C H A S S IS C H A S S IS C H A S S IS C H A S S IS C H A S S IS IN NOT SHOWN ...

Page 272: ... ARE SHOWN ON SCHEMATIC DIAGRAM A3 INVERTER l Cl025 TUO P jpx J ftlQ33 1037 g 1 li0 3 d H R Jflair 1033 _ _ _ 1033 dl03a TR102if g 2 i 1030 cm 035 CR 1023 I J K r Static Sensitive Devices r See Maintenance Section COMPONENT NUMBER EXAMPLE 3829 66 Component Number A23 A2 R1234 I Schematic Assemty i U circuit Number Subassembly Humber Number if used The numbered waveforms board dolly The waveforms i...

Page 273: ...POSITION ALL COMPONENTS MOUNTED ON A3 INVERTER BOARD ARE SHOWN ON SCHEMATIC D IA G R A M 021 T1020 io2s _g Co3 ecn so zm 3829 66 A3 INVERTER Static Sensitive Devices See Maintenance Section COMPONENT NUMBER EXAMPLE Component Number A23 A2 R1234 Schematic AssemU l _ Circuit Number Subassembly Number Number if used Chassis mounted components have no Assembly Number prefix see end of Replaceable Elec...

Page 274: ...orms below were obtained at the test points indicated on the accompanying schematic diagram and board dolly The waveforms are representative of signals that may be expected at the associated points whenever the instrument is running H 48pa H 4V 3829 57 ...

Page 275: ......

Page 276: ... R1261 10 TP201 10 CR1011 9 L1012 9 R1262 10 U1260 10 CR1220 10 L I 402 10 R1264 10 U1270 10 CR1221 10 P251 10 R1270 10 U1270 10 CR1241 10 Q1220 10 R1273 10 U1270 10 CR1242 10 Q1221 10 R1274 10 U1270 10 CR1243 10 Q1222 10 R1280 10 U1270 10 CR1244 10 Q1223 10 R1281 10 U1281 10 CR1260 10 Q1240 10 R1282 10 U1281 10 CR1261 10 Q1241 10 R1283 10 U1281 10 CR1262 10 Q1243 10 R1284 10 U1290 10 CR1263 10 Q1...

Page 277: ...0 2E 8J 0 0 6 2 9F 7F CR1113 8N 7B R1021 6E 6J LR1060 9K 6E 0 0 6 5 5L 6E CR1114 8N 7B R1022 2F 7H 0 0 6 6 7F 7H CR1115 7N 7A R1023 3G 8H T1020 6D 6J 0 0 6 7 9E 7E CR1116 7N 7B R1024 2H 8H T 1050 6F 6G 0071 6H 7F CR1121 6P 7D R1025 2G 8H T1060 5M 6C 0 0 7 2 7H 7F CR1122 5P 7D R1027 2N 8J 0 0 7 5 8J 6E CR1123 5P 7D R1028 3N 8E U1029 3P 8E C1101 10M 6B CR1124 5P 8D R1029 2P 8F U1030 3K 8G 0 1 0 2 10...

Page 278: ......

Page 279: ... 6E 6P 5B 5 6P 5B 3P 8D 9K 6E 6D 6J 6F 6G 5M 6C 6 3P 8E 3K 8G 8G 7E 4N 8E 8H 7E 9H 7E 9F 7E 9F 7E 7 8H 7E 9G 7E 9H 7E 8J 7E 8J 7E 9J 7E 3G 8H 7G 7G 8 7D 7J 6D 7H 6Q 6F 6L 6D 9 SCHEM LO CA TIO N BO A RD LO CA TIO N 5D C H A S SIS io in s r a M 5Vp TO I rcuoz 5 A r i t i t a N D J 2 i 2 A r h T IOOp F f G N D 5 BflB 1 S t T s sy 2445 38M 80 LOW VOLTAGE POWER SUPPLY ...

Page 280: ...234 XTX Subassembly Number it used Schematic Circuit Number Chassis mounted components have no Assembly Number prefix see end of Replaceable Electrical Parts List LABELED ON SOME BOARDS AS P VICE J ALL COMPONENTS MOUNTED ON A10 FAN MOTOR BOARD ARE SHOWN ON SCHEMATIC DIAGRAM be obvious if a little thought is given to the intended circuit function FB feedback 5VD 5 V digital ...

Page 281: ......

Page 282: ...290 5E 2J CR1243 3N 2E Q1240 2K 4E R1286 5L 2G U1300A 5L 2H CR1244 2G 3D Q1241 2J 4E R1291 5F 2H U1300B 6L 2H CR1260 3J 4F Q1243 2H 3E R1292 5F 2H U1300C 5F 2H CR1261 4N 2E Q1245 3H 3E R1293 6F 2H U1300D 5J 2H CR1262 3J 3F Q1280 5M 4G R1300 7M 3G U1300 5D 2H CR1263 4J 3F 01281 5L 4G R1301 7M 3G U1330 10F 4J CR1264 4K 3F Q1300 7M 4H R1302 7L 3H U1371A 3J 3F CR1281 5K 2G Q1301 7L 4H R1304 7L 3H U137...

Page 283: ... 8VJNR EG 3S 5 fROM P232 5 10 A 15VUNREG 8S F R O Mn i 2445 3 0 2 S 8 I ...

Page 284: ...4D 3H 7D 4H 5F 2H 3J 4F 6L 3J 7L 3J 9F 3J 8H 3J 5D 3J 2F 3D 3H 3D 5C 3D 5E 2J 5L 2H 6L 2H 5F 2H 5J 2H 5D 2H 10F 4J 3J 3F 4K 3F 7C 3F 7J 3F 6D 3F 5G 2H 8S 1H SC HEM BO A R D LO C A T IO N LO C A T IO N 3E 1A 2D 1A 2B 1A 2C 1A 2C 1A S C m EM BO A RD LO CA TIO N LO C A TIO N 2445 LOW VOLTAGE REGULATORS AND FAN ...

Page 285: ... 3S IK R225 4B 3C VR125 4A 6D C458 2M 4F J511 10A ID R700 1G 9C VR225 4B 3C C480 2M 2J J511 6S ID R701 IF 9C C521 7M 2H J512 6S 1H R702 2F 9D W101 3A 9B C675 3M 3H R811 2K 7G W102 3A 4K C710 1G 9D L101 8A 6D R951 10P 9J W103 3A 7G C722 3H 6D L107 7B 6D W104 3A 3K C723 3H 6D L113 3B 6D U100 5B 5D W105 4A 5F C731 IOC 8E L219 7B 3D U110 2B 6B W109 4A 9L C733 2H 7E L307 7D 3B U120 2B 6C W121 10A 4J C7...

Page 286: ...2445 3823 82 ...

Page 287: ...ALSO 4 138l 30140 C740 47uF 5V4 TO U735 2 I3 7 K C738 47pF H S JP Ic q fe fc p i 87V TO CRPSfa C R H b fa X v CRP72 S C 88 ceio CPS3 C440 CR807SZ 7 1 0 1 II U 8Q 0 H0R1Z OUTPUT SEE ALSO w m T t o i r R I42 R143 R I44 ELIQ C RWfe u q 5 0 Z AXIS SEE ALSO 24 30l38l LP38I 2 7pH n a U 140 74LSIS4 U I50 74LS Ib4 U475 74LS00 U480 74LS32 T U I4 5 LM 324 Ifel U 170 4 0 5 I U 3 5 0 L M 3 5 8 4 l UB50 4053 H...

Page 288: ...is schematic Acronyms and labels not shown in this listing may be included in the circuit descriptions Section 3 and should be obvious if a little thought is given to the intended circuit function GND C virtual ground C GND R virtual ground R GND S virtual ground S 5VD 5 V digital 15V2 1 5 V decoupled 2 87V1 87 V decoupled 1 ...

Page 289: ... 8G 3J C2188 8C 1H C2642 10C 4D U2162 8F 2J U2556 8J 3J C2217 9B 2E C2734 9C 4F U2178 8F 1J U2580 8H 4J C2218 9B 3D U2214 9E 2D U2596 9F 3J C2221 10C 2C J251 7B 2D U2234 8D 2B U2634 7D 4D C2223 10B 2C U2308 9F 2F U2656 8H 4G C2240 8C 1A P511 6B 4C U2335 8E 3D U2668 9H 4G C2328 10C 4E P512 6B 4H U2362 8F 3J U2770 9H 3J C2346 8C 3D U2378 8F 2J C2354 8B 1C R2608 6L 3A U2408 8E 3A W511 6B 4C C2440 10C...

Page 290: ...B H le w o q 87V T S o I R v n i U1 R1873 PARTIAL A9 HIGH VOLTAGE BOARD 2445 ...

Page 291: ...3E 5H 4E 4C 2B 5B 1A 4B ID 5B 4B SC HEM BO A RD LO C A TIO N LO C A TIO N 8G 3J 8J 3J 8H 4J 9F 3J 7D 4D 8H 4G 9H 4G 9H 3J 6B 4C 7B 4H 7L 1A 6L 4A SC HEM BO A RD 1 LO C A T IO N LO C A TIO N 10M 2A 1 SC HEM LO C A TIO N BO A RD LO CA TIO N 2445 3 8 2 1 8 3 POWER DISTRIBUTIO N B ...

Page 292: ...0 11 J P191 A1 to A9 Pin Line Name Schem 1 1 5 V unreg 8 11 2 10VREF 11 12 3 15V 11 12 4 FOCUS 8 5 ASTIG 8 6 GND 11 12 7 VZOUT 6 8 8 VQOUT 6 8 9 15V2 11 12 10 TRACE ROT 8 11 42V 11 12 12 TRZ 6 13 QGAIN 6 14 87V 11 12 J P W251 A2 to A5 1Pin 1 Line Name J Schem 1 1 5 V 10 12 2 1 5 V 10 12 3 5 V 10 12 4 5 V 10 12 5 GND 10 12 6 GND 10 12 7 5V 10 12 8 5V 10 12 9 GND 10 12 10 GND 10 12 11 5 V d 10 12 12...

Page 293: ...17 DLY REF 1 2 5 18 GND S 11 12 19 A TIM REF 2 5 20 B TIM REF 2 5 21 GND 11 12 22 HORIZ POS 2 6 23 SI 2 4 24 GND 11 12 25 A TRIG LVL 2 5 26 B TRIG LVL 2 5 J P W512 A5 to A1 Pin Line Name Schem 1 CONT DATA 2 4 2 ATTN STRB 2 4 3 ATTN CLK 1 4 4 CH2 PA CLK 1 4 5 CHI PA CLK 1 4 6 A TRIG CLK 1 5 7 B TRIG CLK 1 5 8 A SWP CLK 1 5 9 B SWP CLK 1 5 10 DISP SEQ CLK 1 5 11 RO ON 2 5 12 RO DO 2 6 13 ROS 2 1 6 1...

Page 294: ...A2 1 16 A8 1 17 A1 1 18 A0 1 19 R W 1 20 BD7 1 21 GND C 1 22 BD6 1 23 BD3 1 24 BD5 1 25 BD2 1 26 GND C 1 27 BD1 1 28 BD4 1 29 BDO 1 30 E 1 31 GND C 1 32 10MHZ 1 33 VMA 1 34 RESET 1 J P W511 A5 to A1 Pin Line Name Schem 1 CHI PRB 2 4 2 CH2 OVL 2 4 3 CH4PRB 2 4 4 CH3PRB 2 4 5 CHI OVL 2 4 6 CH2 PRB 2 4 7 CH4POS 2 4 8 CH3POS 2 4 9 CH2 POS 2 4 10 CHI POS 2 4 11 GND 11 12 12 DAC MUX1 IN 2 4 13 GND 11 12...

Page 295: ...IZ VAR 3 4 1 25V 3 5 1 36V 3 W900 A9 to CRT Pin Line Name Schem 1 HEATER 8 2 CATHODE 8 3 GRID 8 4 SLOT 8 5 Q1 8 6 Q2 8 7 Q3 8 8 PLATE AVERAGE 8 9 FIRST ANODE 8 10 VARIABLE OCTOPOLE 8 11 Q3 8 12 Q1 8 13 Q2 8 14 HEATER 8 J P901 A9 to CRT Pin Line Name Schem 1 Q3 8 2 Keyb 8 3 Q1 8 4 Q2 8 5 Keyb 8 6 FIRST ANODE 8 7 Q3 8 8 VARIABLE OCTOPOLE 8 9 PLATE AVERAGE 8 10 Q2 8 11 Q1 8 a No pins exist in J121 2 ...

Page 296: ...IST JloO C 0 L 4 4S ROW 3 2 1 FRONT PANEL BOARD Plcll 5 P I N s Pfc5l 1 0 2fe RIBBON Pb51 IE RIB W5I2 I k RIBBON BON JIOS CH20UT GND WI01 WI08 31 COAX 1 PlOfe C H T o u f PICT e x t 2 AXIS PI08 1 J 1 b g a te 1 J8 A GATE A 7 FRONT PANEL M v a r ia b l e board J25I UST Jfcll SEE LIST 34 PINsJ _ A PI2IIT PInITI PI2 1l 8 PINS JZ32A P232 J232B J23 BIP23IIJ23IA OpT ONS A m H 501 NOCAL J 5 p ll D wsJ T ...

Page 297: ...4B R996 8 3K L90 8 2L S90 9 6A LR1313 8 5M S I 020 9 5D LR1314 8 5M S3185 3 5D P i l l 4 4N V900 8 2L P112 8 3C P113 5 5A W ill 4 5N P114 8 2C W112 8 4B P115 8 4C W113 5 6A P116 5 6A W114 8 3B P204 9 5A W115 8 5B P205 9 6A W116 5 6A P206 9 6A W121 10 2S P207 9 7A W122 10 3S P231 9 5D W122 9 IS P232 9 9S W301 10 1A P233 9 3S W671 3 8N P234 9 7S W900 8 3M P601 3 5D W900 8 6J P671 3 7N W900 8 7J P901...

Page 298: ...A13 CRT TERMINATION A14 DYNAMIC CENTERING ADJUSTMENT LOCATIONS 1 HIGH DRIVE FOCUS EDGE FOCUS GRID BIAS R1842 R1864 R1878 A9 HIGH VOLTAGE ADJUSTMENT LOCATIONS 2 ...

Page 299: ...2445 Service DAC REF A5 CONTROL ADJUSTMENT LOCATIONS 3 ...

Page 300: ......

Page 301: ...J119 O A A Z fio rv ic A J118 VERT READOUT JITTER R618 i x n n t o i n R801 X10 GAIN R850 3829 71 ...

Page 302: ...E LED CODED FAULT SEE TABLES 6 5 T H R O U G H 6 7 REFER T O E R R O R M E S S A G E DIAGNOSTIC P R O C E D U R E N O 2445 Service PRELIMINARY TROUBLESHOOTING Y E S R E TU R N T O V 1 R E TU R N T O V 1 v REFER T O N O P KERN EL DIAGNOSTIC P R O C E D U R E 3829 86 ...

Page 303: ...uses of Trigger Error Messages Test 05 Fail Probable Causes of Failure 01 a Line Signal b U500 Trigger c U650 Trigger Status Data to Processor 02 or 22 a Line Signal b U500 Trigger 04 or 44 a U2634A U2235 or U500 b Line Signal ...

Page 304: ...2 R E TU R N T O 1 ...

Page 305: ...ERROR MESSAGE DIAGNOSTICS ...

Page 306: ...ERROR MESSAGE DIAGNOSTICS ...

Page 307: ...O A A C t rnra g i tiw c t 3829 89 ...

Page 308: ...RETURN TO ...

Page 309: ...FRONT PANEL TROUBLESHOOTING ...

Page 310: ...FRONT PANEL TROUBLESHOOTING ...

Page 311: ...2445 Service 3829 90 ...

Page 312: ... usually do this 1 Check that the horizontal positioning input pin 22 of U800 of the Horizontal Output 1C varies approxi mately from 1 25 volts to 1 25 volts as the Hori zontal POSITION control is rotated through its range If it does not repair the position circuit 2 Check that the A Sweep Ramp at pin 18 of U800 is ramping from 1 25 volts to 1 25 volts If it is not check the buffer amplifier made ...

Page 313: ...f AT INPUT C H 4 J C O N N E C TO R S CHOP ALT IN CHO P EXT Z AXIS IN N O SIGNAL A T C O N N E C TO R A A N D B SEC DIV 1ms LO C K E D POSITION C O N TR O LS ALL AT M ID R AN G E H O LD O FF FULLY C C W A TRIG G ER M O D E A U TO INTENSITY FULLY C W R O INTENSITY FULLY C W BAND W IDTH LIMIT SW ITCH O U T P R ESS A t TH E N P R ESS AV RO TATE A R E F 6 TU R N S C C W TH EN 2 TU R N S C W R E TU R N...

Page 314: ...A TRIG G ER M O D E A U TO INTENSITY FULLY C W R O INTENSITY FULLY C W BAND W IDTH LIMIT SW ITCH O U T PR ESS A t TH E N PRESS AV RO TATE A R EF 6 TU R N S CCW TH EN 2 TU R N S C W CONTROL DATA OCK LINES t nper P503 on the scope This forces the processor ddress Decode circuitry the DAC MSB CLK at trol Board Use NORM TRIGGER LEVEL to locks appear at 104 ms to juts of U2850 has similar U2596 diagram...

Page 315: ...TH E SCHEM ATIC DIAG RAM A N D TH E O R Y O F O PERATIO N SECTIONS R EFER T O TH E S W E E P DIAGNOSTIC P R O C E D U R E R EFER T O TH E VERTICAL TRO UBLESHO O TING HINTS AT LEFT refer to the R E AD O U T DIAGNOSTIC P R O C E D U R E S O To returnX go t o 1 5 J T O J v 6 J 3829 87 ...

Page 316: ...R E TU R N T O v 1 y ...

Page 317: ...SWEEP TROUBLESHOOTING PROCEDURE ...

Page 318: ...2445 Service NOTE 3 56V IS M E A S U R E D A S 1 44V W ITH R ESPEC T TO TH E 5V SUPPLY 3829 95 ...

Page 319: ...IVE C H E C K U2865 1 P U LS E S U2860 12 HI U2865 3 U2860 3 I P U LS E S U2960 3 LO U2920 16 U2865 2 N 5 6 7 11 A N D 12 U2860 1 2 U2960 5 ACTIVE 6 7 9 1 0 1 1 12 13 14 A N D 15 U2935 1 19l U2920 11 P U LS E S HI B U T IS LO A T S A M E TIM E A S U2920 16 T R O U B LE S H O O T IND IC ATED FA U LT ...

Page 320: ... 10M H z LINE Y E S Y E S Y E S P R O B L E M IS O N M A IN B O A R D B A D C O M P O N E N T IN A R E A O F U 2890C O R U 2970C C H E C K G R ID BIAS A D JU S T M E N T Y E S C H E C K P A TH U2985 12 U2990 5 6 U2880 2 A N D U2880 6 C H E C K IN G U2880 3 F O R ACTIVITY A N D U2880 1 F O R A HI ...

Page 321: ...30 13V N 0 B A D C O N N E C T IO N O N 10M H z LINE V ACTIVE A C T IV E C H E C K F O R P O W E R U P E R R O R C O D E O N LE D S A N D R E F E R T O A P P R O P R IA TE T R O U B LE S H O O T IN G P R O C E D U R E IO B L E M W ITH D L Y R E F0 D L Y R E F 1 U2800 O R U2805 Y E S ...

Page 322: ...E S C H E C K U2830A A N D U2830B F O R PARTIAL FAILURE P R O B L E M IN A R E A O F U2800 U2820 U2805 U2810 O R U2900 CALIBRATIO N O F AV C U R S O R S IS W R O N G P R O B L A R E U2800 3 E M IN O F 1 2 1 5 3829 88 ...

Page 323: ......

Page 324: ...2445 Service 3829 85 ...

Page 325: ......

Page 326: ... KERNEL NOP DIAGNOSTIC PROCEDURE ...

Page 327: ...10 POWER SUPPLY TROUBLESHOOTING PROCEDURE 3829 94 ...

Page 328: ... PRIMARY TEST LOAD 1 5 2 0 0 6 6 0 0 4 EA 4 5 k f l 20V 3 0 8 0 0 3 3 0 0 5 V D Test Load Some load is required for the Inverter to run When the Power Supply module is removed from the instrument or when the Regulator Board is disconnected from the Inverter Board s output the test load described below may be used to check operation of the Inverter NOTE E ac h of th e R eg u lato rs req u ires aloa...

Page 329: ...M A Y B E C H E C K E D W ITH O U T USING TH E LINE P O W E R O R LINE ISOLATION TR AN SFO R M ER REPAIR INDICATED FAULT R E TU R N TO NO P R O B LE M IS O N INVERTER B O A R D I U N SO LD ER A N D LIFT TH E E N D O F W 1060 N EAR EST PIN 7 O F T1060 C O N N E C T TH E PRIM ARY TEST LO AD DESCRIBED AT LEFT B E TW E E N TH E LIFTED E N D O F W 1060 A N D TH E S O U R C E S O F Q1060 A N D Q1070 382...

Page 330: ......

Page 331: ...N D TH E C A TH O D E O F CR1050 TU R N TH E PS503 O N A N D S LO W LY RAISE ITS O U TP U T TO 28V YES R E D U C E O U TP U T LEVEL O F D C P O W E R SUPPLY UNTIL DRIVE F R O M U1030 STO PS C H E C K ZEN ER DIODE VR1020 R E D U C E PS503 O U TPU T LEVEL TO 16V D O E S C A TH O D E O F CR1023 G O HIGH B E TW E E N 20V 25V N O C H E C K Q 1021 Q1022 VR1020 Q1040 A N D ASSOCIATED CIRCUITRY YES N O DI...

Page 332: ...oltage sense com b The operation of the supply Regulators is inter dependent If a supply is out of regulation verify that the supply of next greater magnitude is operating properly Repair faulty Regulators in the following order 87 V 42 V 15 V 5 V 15 V 8 V and then 5 V c Verify that the current limit circuit is not activated d Check drive to series pass device and verify that the device is not ope...

Page 333: ... THR O U G H VI371C AN D U1040 EXERCISE THE CIRCUIT BY VARYING R1292 VOLT REF ADJ AN D VERIFY THAT 5Vq VARIES USING THE REG ULATO R REPAIR NOTES AT LEFT AND THE THEO RY O F OPERATION CHECK AN D REPAIR THE REG ULATO RS IN THE FOLLOW ING O RDER 15V U N R EG FUSE 1330 87V 42V 15V 5V 15V 8V AN D 5V CHECK FUSE F1102 RECTIFIER CR1110 Cl 110 Cl 111 L 1 1 1 0 AND 5V OUTPUT W IN D IN G S OF T 1 0 6 0 YES s...

Page 334: ...2445 Service REGULATOR TROUBLESHOOTING PROCEDURE 3829 93 ...

Page 335: ... referenced by figure and index numbers to the illustrations ITEM NAME In the Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further Item Name identification the U S Federal Cataloging Handbook H6 1 can be utilized where possible ABBREVIATIONS INCH NUMBER SIZE ACTR ACTUATOR ADPTR ADAPTER ALIGN AL...

Page 336: ... DIV 95987 WECKESSER CO INC 2015 SECOND ST 4350 WEST 78TH 105 SE TAYLOR 6520 N BASIN AVE 647 INDUSTRY DRIVE 4288 S E INTERNATIONAL WAY 3195 BLUFF ST 2041 ROSENCRANS AVE SUITE 365 1723 1ST AVE SO P 0 BOX 3608 1818 CHRISTINA ST 415 E WASHINGTON BLVD 5825 N TRIPP AVE RICHARDS AVENUE 9301 ALLEN DRIVE P 0 BOX 1331 77 DRAGON COURT 10200 AVIATION BLVD YOUK EXPRESSWAY 2620 ENDRESS PLACE 509 HINDRY AVE 30 ...

Page 337: ...4 3374 00 9 337 2926 00 1 SHLD IMPLOSION 4 33 X 3 56 XO 06 CLEAR 80009 337 2926 00 378 0199 00 1 FILTER LT CRT BLUE 4 1 X 3 32 X 0 03 80009 378 0199 00 10 211 0720 00 3 SCR ASSEM WSHR 6 32 X 0 50 PNH TORX 01536 O B D 11 343 0003 00 1 CLAMP LOOP 0 25 ID PLASTIC 95987 1 4 6B 12 161 0104 00 1 CABLE ASSY PW R 3 WIRE 98 0 LO NG 16428 KH8352 13 334 4378 00 1 MARKER IDENT MKD PRO BE PO W ER 80009 334 437...

Page 338: ......

Page 339: ... 40 X 0 312 PNH 01536 O BD 22 131 0608 00 5 TERMINAL PIN 0 365 L X 0 025 PH BRZ GOLD 22526 47357 23 129 0941 00 2 SPACER POST 1 86 L W 4 40INT THD 80009 129 0941 00 24 175 4597 00 1 CA ASSY SP ELEC 5 26 AWG 4 0 L RIBBON 80009 175 4597 00 25 1 CKT BOARD ASSY FRONT PANEL SEE A6 REPL REPLACEABLE ONLY AS 672 1038 XX ATTACHING PARTS 26 211 0304 00 5 SCREW MACHINE 4 40 X 0 312 PNH 01536 O BD 27 377 0550...

Page 340: ... 4 0 L 8 01 80009 195 3984 00 195 3986 00 1 LEAD ELECTRICAL 18 AWG 4 0 L 8 0 80009 195 3986 00 59 119 1536 00 1 FILTER RFI 3A 250VAC 50 60 HZ O O O KX ZUB2203 000 ATTACHING PARTS 60 211 0332 00 2 SCR ASSEM WSHR 4 40 X 0 5 PNH TORX DRIVE 01536 O BD 61 210 0586 00 2 NUT PL ASSEM WA 4 40 X 0 25 STL 83385 O BD 62 195 3989 00 1 LEAD ELECTRICAL 18 AWG 4 0 L 8 9 80009 195 3989 00 63 195 3990 00 I LEAD EL...

Page 341: ...IDED 1 65 L 80009 195 6851 00 ATTACHING PARTS 95 211 0324 00 1 SCR ASSEM WSHR 4 40 X 0 188 L PNH TORX MCH 01536 O BD 96 210 0551 00 1 NUT PLAIN HEX 4 40 X 0 25 INCH STL 000BK O B D 195 8410 00 1 LEAD ELECTRICAL 22 AWG 1 65 L 80009 195 8410 00 ATTACHING PARTS 97 211 0324 00 1 SCR ASSEM WSHR 4 40 X 0 188 L PNH TORX MCH 01536 O BD 98 210 0551 00 1 NUT PLAIN HEX 4 40 X 0 25 INCH STL 000BK O BD 99 210 ...

Page 342: ... 00 1 SHIELD ELEC LOW VOLTAGE PO W ER SUPPLY ATTACHING PARTS 80009 337 2978 00 19 211 0711 00 2 SCR ASSEM WSHR 6 32 X 0 25 L PNH TORX 01536 O BD 20 211 0304 00 2 SCREW MACHINE 4 40 X 0 312 PNH 01536 O B D 21 407 2830 00 1 BRKT CM PNT MTG CAP MOTOR LEFT PLASTIC ATTACHING PARTS 80009 407 2830 00 22 211 0332 00 2 SCR ASSEM WSHR 4 40 X 0 5 PNH TORX DRIVE 01536 O BD 23 407 2829 00 1 BRKT CMPNT MTG CAP ...

Page 343: ...1 0608 00 22 TERMINAL PIN 0 365 L X 0 025 PH BRZ G O LD 22526 47357 62 136 0263 04 18 SOCKET PIN TERM FOR 0 025 INCH SQ UARE PIN 22526 75377 001 63 4 TERM QIK DISC CKT BD MNT 0 11 X 0 02 SEE A2P204 P205 P206 P207 REPL 64 129 0976 00 1 SPACER POST 0 86 L X 6 32 POLY 0 3 80009 129 0976 00 65 361 1132 00 6 SPACER CKT BD A 80009 361 1132 00 66 337 3059 00 1 SHIELD ELEC LVPS 80009 337 3059 00 67 1 CKT ...

Page 344: ...W ASHER LOCK EXT 0 123 ID X 0 245 0D STL 78189 1104 00 00 0541C 97 210 0586 00 4 NUT PL ASSEM WA 4 40 X 0 25 STL 83385 O B D 214 2270 00 1 SPRING GROUND CRT TO SHIELD 80009 214 2270 00 ATTACHING PARTS 211 0324 00 1 SCR ASSEM WSHR 4 40 X 0 188 L PNH TORX MCH 01536 O B D 129 0985 00 1 SPACER POST 0 350 L W 4 40 THD THRU 000KU O B D 98 214 0973 00 1 HEAT SINK ELEC 0 28 X 0 18 OVAL X 0 187 H 80009 214...

Page 345: ... 1 PLATE MOUNTING ACCY POUCH ALUM 80009 386 4849 00 070 3829 00 1 MANUAL TECH SERVICE 2445 OSCILLOSCOPE 80009 070 3829 00 070 3830 00 1 MANUAL TECH OPERATORS 2445 OSCILLOSCOPE 80009 070 3830 00 070 4180 00 1 CARD INFO REF 80009 070 4180 00 4 1 010 6131 01 OPTIONAL ACCESSORIES PROBE VOLTAGE P6131 10X W ACCESSORIES 80009 010 6131 01 016 0720 00 COVER PROT NYLON 80009 016 0720 00 346 0058 00 FASTENER...

Page 346: ...12 2445 SERVICE ...

Page 347: ...2445 SERVICE ...

Page 348: ...2445 SERVICE ...

Page 349: ...to printing and shipping requirements we can t get these changes immediately into printed manuals Hence your manual may contain new change information on following pages A single change may affect several sections Since the change information sheets are carried in the manual until all changes are permanently entered some duplication may occur If no such change pages appear following this page your...

Page 350: ...imits 1 25 03 div 9 81 mV to 10 20 mV 19 6 mV to 20 4 mV 49 0 mV to 50 9 mV 98 1 mV to 102 0 mV 196 mV to 204 mV 490 mV to 509 mV 0 981 V to 1 020 V 1 96 V to 2 04 V 4 90 V to 5 09 V 9 81 V to 10 2 V 19 6 V to 20 4 V Page 5 8 Step 2 second NOTE CHANGE the third line to read as follows V0LTS DIV switches to the 0 1 V per division Page 5 12 CAL 02 Vertical Step 2 part h CHANGE to read as follows h C...

Page 351: ...2 00 281 0774 00 B010100 B010100 CKT BOARD ASSY READOUT RES FXD CMPSN 4 3K OHM 5 0 25W CAP FXD CER DI 0 022 MFD 20 100V 112 105 ADD A9R1830 307 0110 00 B010100 RES FXD CMPSN 3 0HM 5 0 25W 116 REMOVE A9CR1951 152 0787 00 B010478 SEMICOND DEVICE RECT SI 12KV 3MA A LZV 156 DIAGRAM CHANGES EFF SN EFF ALL SERIAL NUMBERS except for removing CR1951 which is B010478 DIAGRAM HIGH VOLTAGE SUPPLY AND CRT ADD...

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