Tektronix TDS 420A Service Manual Download Page 250

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Troubleshooting

6- 98

TDS 420A, TDS 430A & TDS 460A Service Manual

Figure 6- 49: Backplane Troubleshooting Procedure

Replace the

A01 Backplane

module.

Perform the A25 Low

Voltage Power Supply

troubleshooting procedure.

Yes

Use this procedure to

troubleshoot the A01 Backplane

board.

Press the

ON/STBY

button.

Does the

oscilloscope

power up?

Does the

oscilloscope power

up?

Disconnect P2 (between the

A07 Auxiliary Power and A25 Low

Voltage Power Supply modules).

Press the

ON/STBY

button.

Replace the A25 Low

Voltage Power Supply

board.

Reconnect P2. Press
the

ON/STBY

button.

Does the

oscilloscope power

up?

Yes

Replace either the A06 Front Panel,

A01 Backplane, or A07 Auxiliary

Power boards.

Are the

voltages at U1--U4 ok

(see Table 6--17 and

Figure
6--50)?

Replace the

A01 Backplane

module.

Are the

voltages at J7

ok (see Table 6--18 and

Figure 6--50)?

Yes

There is not a problem

with the

A01 Backplane.

Are the

voltages at J8 ok

(see Table 6--19)?

Does

one of the

plug-in boards not

work, but the other

boards

do?

Does the

bad board

work in another

A01 Backplane slot?

Replace the A01 Backplane

module.

Replace the bad

board.

Are there

intermittent

problems?

Replace the A01 Backplane

module.

Are

there still

problems?

Replace the

A01 Backplane

module.

Yes

Summary of Contents for TDS 420A

Page 1: ...0000 and above 070 9703 06 Revsion A Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service www tektronix com ...

Page 2: ... and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX and TEK are registered trademarks of Tektronix Inc ...

Page 3: ...cations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or conn...

Page 4: ... select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 1 503 627 2400 6 00 a m 5 00 p m Pacific time This phone number is toll free in North America After office hours please leave a voice mail message Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list ...

Page 5: ...racteristics 1 23 Operating Information Installation 2 1 Supplying Operating Power 2 1 Operating Environment 2 3 Applying and Interrupting Power 2 4 Repackaging Instructions 2 5 Installed Options 2 5 Operating Information 2 7 Screen Layout 2 7 Basic Procedures 2 7 Theory of Operation Theory of Operation 3 1 Logic Conventions 3 1 Module Overview 3 1 Performance Verification Performance Verification...

Page 6: ... Required 5 5 Adjustment Instructions 5 7 Probe Adjustment 5 10 Monitor Assembly Adjustment 5 21 Maintenance Maintenance 6 1 Related Maintenance Procedures 6 1 Preparation 6 2 Inspection and Cleaning 6 4 Removal and Installation Procedures 6 9 Preparation Please Read 6 9 Access Procedure 6 13 Procedures for Module Removal and Installation 6 23 Disassembly for Cleaning 6 71 Troubleshooting 6 75 Dia...

Page 7: ...e 4 37 Figure 4 12 Initial Test Hookup 4 38 Figure 4 13 Initial Test Hookup 4 41 Figure 4 14 Measurement of Trigger Sensitivity 4 43 Figure 4 15 Initial Test Hookup 4 45 Figure 4 16 Confirming Auxiliary Triggering at Maximum Triggering Frequency 4 46 Figure 4 18 Initial Test Hookup 4 49 Figure 4 19 Adjusting Sync Pulse Amplitude 4 51 Figure 4 20 Measurement of Video Sensitivity 4 52 Figure 4 21 In...

Page 8: ...net handle and feet removal 6 28 Figure 6 9 Trim ring menu elastomer and menu buttons removal 6 31 Figure 6 10 EMI gasket removal and installation 6 33 Figure 6 11 Disk drive removal 6 34 Figure 6 12 A06 Front Panel assembly ESD shield and menu flex and probe code flex circuits removal 6 36 Figure 6 13 Disassembly of the front panel assembly 6 37 Figure 6 14 A05 Attenuator removal 6 40 Figure 6 15...

Page 9: ...nd Blanking Levels 6 89 Figure 6 40 A26 Monitor Connector J440 6 90 Figure 6 41 A07 Auxiliary Power Connectors J4 and J7 6 90 Figure 6 42 A02 Display Connector J2 6 91 Figure 6 43 Processor Front Panel Troubleshooting Procedure 6 92 Figure 6 44 A06 Front Panel Board Power Connectors J101 and J106 6 93 Figure 6 45 Attenuator Acquisition Troubleshooting Procedure 6 94 Figure 6 46 A08 Jumper and A05 ...

Page 10: ...up Cont 9 7 Figure 9 6 TDS 400A Block Diagram B080000 up 9 8 Figure 9 6 TDS 400A Block Diagram B080000 up Cont 9 9 Figure 10 1 External and front panel modules 10 7 Figure 10 2 Internal modules B010100 B079999 10 9 Figure 10 3 Internal modules B080000 Up 10 11 Figure 10 4 Cables and routing B010100 B079999 10 13 Figure 10 5 Cables and routing B080000 Up 10 15 ...

Page 11: ...Table 1 13 Warranted Characteristics Probe Compensator Output 1 18 Table 1 14 Warranted Characteristics Power Requirements 1 18 Table 1 15 Warranted Characteristics Environmental Safety and Reliability 1 19 Table 1 16 Certifications and compliances 1 20 Table 1 17 Typical Characteristics Signal Acquisition System 1 23 Table 1 18 Typical Characteristics Time Base System 1 24 Table 1 19 Typical Char...

Page 12: ... Troubleshooting Test Equipment Fixtures and Supplies 6 77 Table 6 9 Connections for a 9 to 25 Pin Null Modem Cable 6 78 Table 6 10 Diagnostic Failure Priority Lists 6 83 Table 6 11 Normal Output Voltage 6 85 Table 6 12 Power Supply Maximum Current 6 87 Table 6 13 Front Panel Connector Voltages 6 93 Table 6 14 Channel and P1 Signal Locations 6 95 Table 6 15 A05 Attenuator Board Power 6 96 Table 6 ...

Page 13: ...the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Do Not Operate Without Covers To avoid electric shock or fire hazard do not operate this product with covers or panels removed Use Proper Fuse To avoid fire hazard use only the fuse type and rating specified for this produc...

Page 14: ...These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product Protective Ground Earth Terminal ATTENTION Refer to Manual DANG...

Page 15: ...retain hazardous voltages for long periods of time after power is turned off Before attempting any servicing discharge the CRT by shorting the anode to chassis ground When discharging the CRT connect the discharge path to ground and then the anode Rough handling may cause the CRT to implode Do not nick or scratch the glass or subject it to undue pressure when removing or installing it When handlin...

Page 16: ...Service Safety Summary xii TDS 420A TDS 430A TDS 460A Service Manual ...

Page 17: ...stics and descriptions that apply to it H Operating Information is this chapter It includes a description of how this manual is structured as well as general information and operating instruc tions at the level needed to safely power on and service this oscilloscope A statement of the service strategy that this manual supports and instructions for shipment of the digitizing oscilloscope are found ...

Page 18: ...oscilloscope is referred to generically as a module In general a module is an assembly like a circuit board rather than a component like a resistor or an integrated circuit Sometimes a single component is a module for example the chassis of the oscilloscope is a module Symbols and terms related to safety appear in the General Safety Summary and Service Safety Summary found at the beginning of this...

Page 19: ... 420A and TDS 460A Digitizing Oscilloscopes H The Reference gives you a quick overview of how to operate your oscillo scope H The User Manual provides instructions on how to operate your oscilloscope H The Programmer Manual provides complete information on programming and remote control of the oscilloscope through the GPIB ...

Page 20: ...P If servicing a TDS 430A follow the procedures for the TDS 420A but ignore all references to CH 3 and CH 4 Strategy for Servicing STOP Throughout this manual any field replaceable component assembly or part of this oscilloscope is referred to generically as a module This manual contains all the information needed for periodic maintenance of your oscilloscope Examples of such information are proce...

Page 21: ...rovide warranty service at most Tektronix service locations worldwide Your Tektronix product catalog lists all service locations worldwide The following services may be purchased to tailor repair and or calibration of your digitizing oscilloscope to fit your requirements Option 95 With this option Tektronix ships a test data report for the oscilloscope At Depot Service Tektronix offers several sta...

Page 22: ... for remanufactured ones Tektronix ships you an updated and tested exchange module from the Beaverton Oregon service center typically within 24 hours Each module comes with a 90 day service warranty For More Information Contact your local Tektronix service center or sales engineer for more information on any of the repair or adjustment services just described ...

Page 23: ...200 MHz TDS 430A 400 MHz Channels TDS 460A Four each with 8 bit resolution TDS 420A Four each with 8 bit resolution TDS 430A Two each with 8 bit resolution Record lengths maximum 30 000 samples 120 000 with option 1M Acquisition modes Sample envelope average high resolution and peak detect Trigger modes Edge With Option 05 video trigger modes include NTSC SECAM PAL and Custom Display Modes Infinit...

Page 24: ...ing at the right side of the screen Use the buttons to the right of the menu to select a setting such as DC Several on screen readouts help you keep track of the settings for various functions such as vertical and horizontal scale and trigger level There are also readouts to display the results of measurements made using cursors or using the automatic parameter extraction feature called measure an...

Page 25: ...or display A math waveform results when you specify operations such as add or invert a reference waveform results when you save a live waveform in a reference memory Horizontal System There are three horizontal display modes main only main intensified and delayed only You can select among various horizontal record length settings see Table 1 2 Table 1 2 Record Length vs Divisions per Record Record...

Page 26: ...illoscopes ordered with Option 5 also have the video trigger mode This trigger mode allows triggering on NTSC standard PAL standard SECAM stan dard and custom video waveforms You can configure the triggering for interlaced or non interlaced scanning different scan rates field selection line selection and for delay by line or time You can choose where the trigger point is located within the acquire...

Page 27: ... Voltage can be measured between the positions of H Bar horizontal cursors and time can be measured between V Bar vertical cursors These are delta measurements that is measurements based on the difference between two cursors You can use both V Bar and H Bar cursors to make absolute measurements measurements relative to a defined level or event In the case of the H Bars either cursor can be selecte...

Page 28: ...obtain hard copies You can start a hardcopy from the oscilloscope front panel you are not required to connect into a system controller environment The hard copies obtained are WYSIWYG What You See Is What You Get based on what is displayed at the time hardcopy is invoked H Output of display hard copies of oscilloscope control setups and of waveforms to a floppy disk in the oscilloscope file system...

Page 29: ...olution Hi Res Mode Clock Internal Clock External ResolutionHiRes 8 Ꮑ8 0 5 Log2Ꮛ time div 500 10 9 ᏐᏆ 15 bits ResolutionHiRes 8 Ꮑ8 0 5 Log2Ꮛ 100 000 000 ClockExternalMenu ᏐᏆ 11 8 bits Bandwidth Hi Res Mode Clock Internal Clock External For 1 s div and slower BWHiRes 0 44 Ꮛ 50 time div Ꮠ Hz BWHiRes 44 ᏋClockExternalMenu 100 Ꮠ Hz Input Channels Number of TDS 430A Two both identical called CH 1 and C...

Page 30: ... voltage level change resolved by the 8 bit A D Converter with the input scaled to the volts division setting of the channel used Expressed as a voltage a DL is equal to 1 25 of a division times the volts division setting 2 GND input coupling disconnects the input connector from the attenuator and connects a ground reference to the input of the attenuator 3 The sensitivity ranges from 1 mV div to ...

Page 31: ...mory to produce a record of time sequential samples 2 The range of waveform rates for equivalent time or interpolated waveform records 3 The Waveform Rate WR is the equivalent sample rate of a waveform record For a waveform record acquired by real time sampling of a single acquisition the waveform rate is the same as the real time sample rate for a waveform created byinterpolation ofreal time samp...

Page 32: ...onofluoride Both are type BR2 3A UL listed Both are rated at 3 0 volt 1 2 amp hour 1 Batteries are not accessible from the outside of the instrument therefore a service technician must replace them Table 1 8 Nominal Traits GPIB Interface Video Output and Power Fuse Name Description Interface GPIB GPIB interface complies with IEEE Std 488 1 1987 and IEEE Std 488 2 1987 Interface RS 232 Option 13 on...

Page 33: ...on aluminum cabinet Weight Standard digitizing oscilloscope 9 8 kg 21 6 lbs oscilloscope only 11 4 kg 25 1 lbs with front cover accessories and accessories pouch installed 15 7 kg 34 6 lbs when packaged for domestic shipment 225 grams 0 5 lbs Floppy Disk Drive only Rackmount digitizing oscilloscope 9 4 kg 20 6 lbs plus the weight of rackmount parts for the rackmounted digitizing oscilloscope Optio...

Page 34: ...es pouch are installed 165 mm 6 5 in without the accessories pouch installed Width 381 mm 15 in with handle Depth 471 mm 18 55 in oscilloscope only 490 mm 19 28 in with optional front cover installed 569 mm 22 4 in with handle fully extended Rackmount digitizing oscilloscope Height 178 mm 7 0 in Width 483 mm 19 0 in Depth 472 mm 18 6 in without front panel handles 517 mm 20 35 in with front panel ...

Page 35: ...Nominal Traits TDS 420A TDS 430A TDS 460A Service Manual 1 13 327 2 mm 12 88 in 471 mm 18 55 in 381 mm 15 in 165 mm 6 5 in 308 1 mm 12 13 in 569 mm 22 4 in Figure 1 1 TDS 400A Dimensional Drawing ...

Page 36: ...Nominal Traits 1 14 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 37: ...e is adjusted at an ambient temperature between 20_ C and 30_ C has had a warm up period of at least 20 minutes and is operating at an ambient temperature between 0_ C and 50_ C unless otherwise noted Table 1 10 Warranted Characteristics Signal Acquisition System Name Description Accuracy DC Voltage Mea Measurement Type DC Accuracy y g surement Averaged Average of 16 waveforms 1 5 reading Net Offs...

Page 38: ...Channels Full Bandwidth Equivalent Time 200 ps between CH 1 and CH 2 and between CH 3 and CH 4 when both channels have equal volts division and coupling settings 450 ps for any other combination of two channels with equal volts division and coupling settings Input Impedance DC 1 MΩ Coupled 1 MΩ 0 5 in parallel with 15 pF 2 0 pF Matched between channels to within 1 for resistance and 1 0 pF for cap...

Page 39: ...escription Accuracy Long Term Sample Rate and Delay Time 150 ppm over any 1 ms interval Accuracy Absolute Time and Delay Time Measurements1 2 For single shot acquisitions using sample or high resolution acquisition modes and a bandwidth limit setting of 100 MHz 1 WI 150 ppm of Reading 450 ps For single shot acquisitions using sample or high resolution acquisition modes and a bandwidth limit settin...

Page 40: ...uency External Clock DC to 10 MHz High and low levels must be stable for 50 ns 1 Net Offset Offset Position Volts Div Net Offset is the voltage level at the center of the A D converter dynamic range Offset Accuracy is the accuracy of this voltage level 2 The minimum sensitivity for obtaining a stable trigger A stable trigger results in a uniform regular display triggered on the selected slope The ...

Page 41: ...ation limited to 4_ C minimum Nonoperating 22_ C to 60_ C Relative humidity Operating without disk to 80 at or below 29_ C to 20 at or below 50_ C Operating with disk 20 4_ C to 50_ C to 80 4_ C to 29_ C Nonoperating 20 4_ C to 60_ C to 90 22_ C to 40_ C Altitude Operating to 15 000 ft 4570 m Nonoperating to 40 000 ft 12190 m 1 Maximum operating temperature is decreased 1_ C per 1000 feet 305 mete...

Page 42: ...ruptions immunity Performance criterion B EN 61000 3 2 AC power line harmonic emissions Australia New Zealand Declaration of Conformity Complies with EMC provision of Radiocommunications Act per the following standard s Declaration of Conformity EMC AS NZS 2064 1 2 Industrial Scientific and Medical Equipment 1992 FCC Compliance Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpa...

Page 43: ...ry use Installation Overvoltage Category Terminals on this product may have different installation overvoltage category designations The installation categories are CAT III Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT II Local level mains wall sockets Equipment at this level includes appliances portable tools and sim...

Page 44: ...Warranted Characteristics 1 22 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 45: ...e Description Accuracy DC Voltage Measurement Measurement Type DC Accuracy y g Not Averaged Any Sample 1 5 reading Net Offset1 Offset Accuracy 0 13 div 0 6 mV Delta Volts between any two sam ples2 1 5 reading 0 26 div 1 2 mV Frequency Limit Upper 100 MHz Band width Limited 100 MHz Frequency Limit Upper 20 MHz Band width Limited 20 MHz Nonlinearity 1 DL differential 1 DL integral independently base...

Page 46: ...alue one second after the mid level crossing of the step expressed as a percentage of the step amplitude Table 1 18 Typical Characteristics Time Base System Name Description Aperture Uncertainty For real time or interpolated records having duration 1 minute 50 ps 0 03 ppm Record Duration RMS For equivalent time records 50 ps 0 06 ppm WI1 RMS Fixed Error in Sample Time 50 ps External Clock sampling...

Page 47: ...e Reject Three and one half times the DC coupled limits4 High Frequency Reject One and one half times the DC coupled limits4 from DC to 30 kHz Attenuates signals above 30 kHz Low Frequency Reject One and one half times the DC coupled limits4 for frequencies above 80 kHz Attenuates signals below 80 kHz Video Mode Option 05 Equipped Instru ments Only Line Rate Class Four classes are provided as foll...

Page 48: ...ED stays constantly lighted when the SEC DIV setting is 2 ms or faster but may flash when the SEC DIV setting is 10 ms or slower 4 See the characteristic Sensitivity Edge Type Trigger DC Coupled in Table 1 12 which begins on page 1 18 5 The maximum frequency for a delaying events input 6 The minimum pulse width and rearm width required for recognizing a delaying event Table 1 20 Typical Characteri...

Page 49: ...illo scope has a suitable two pole three terminal grounding type plug GROUNDING This instrument is safety Class 1 equipment IEC designation All accessible conductive parts are directly connected through the grounding conductor of the power cord to the grounded earthing contact of the power plug The power input plug must be inserted only in a mating receptacle with a grounding contact where earth g...

Page 50: ...able 2 2 Power Cord Identification Plug Configuration Normal Usage Option Number North America 125 V Standard Europe 230 V A1 United Kingdom 230 V A2 Australia 230 V A3 North America 230 V A4 Switzerland 230 V A5 The line voltage ranges and their associated line frequency ranges over which this oscilloscope operates are listed in Chapter 1 Specification See Source Voltage and Frequency on page NO ...

Page 51: ...n may indicate that you need to replace the batteries Operating Environment The following environmental requirements are provided to ensure proper operation and long oscilloscope life Operate the oscilloscope where the ambient air temperature is between 0_ C and 50_ C and store the oscilloscope at an ambient temperature from 40_ C to 75_ C After storage at temperatures outside the operating limits...

Page 52: ... so might result in the loss of internally stored adjustment constants In general do not power off the oscilloscope when doing operations that affect the data types listed in Table 2 3 Wait for the oscilloscope to finish the operation when doing adjustments saving waveforms or saving setups After operations complete wait at least four more seconds before turning the power off Improper power down o...

Page 53: ...wner s address the name and phone number of a contact person the type and serial number of the oscilloscope the reason for returning to oscilloscope and a complete description of the service required Seal the shipping carton with an industrial stapler or strapping tape Mark the address of the Tektronix Service Center and also your own return address on the shipping carton in two prominent location...

Page 54: ...Installation 2 6 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 55: ...ng how the oscilloscope functions Screen Layout The screen layout is illustrated in Figure 2 1 on page 2 8 Note that the figure illustrates a full graticule you may also select a grid crosshair or frame graticule from the display menu Basic Procedures Push the principal power switch found on the rear panel of the digitizing oscilloscope then push the ON STBY standby switch to toggle the digitizing...

Page 56: ...Map of Display Functions Push the HELP front panel button to enter help mode Front panel knobs and buttons now display information about their function when turned or pushed Push HELP again to exit help mode To get help information on a menu item display the menu desired if you are in help mode exit help first Push HELP Now the menu buttons display information about their function when pushed Push...

Page 57: ...nel button to use a main menu and then a side menu to set the function The following steps illustrate both procedures 1 Locate the block that contains the function to be set Special Controls Block Accesses all functions except those in the remaining three control blocks Vertical Controls and Inputs Block Horizontal Controls Block Trigger Controls Block Setting Functions ...

Page 58: ...figure that precedes the step 1 2 5 6 4 8 7 3 a Input waveforms into these channels 7 Example CH 1 b Push any channel button 8 to display its waveform The last channel selected determines which waveform is positioned and scaled The indicator above the channel last selected is lighted Example Push CH 1 then CH 2 c Vertically 1 and horizontally 2 scale and position the waveform s selected Example Se...

Page 59: ...mple Push CH 2 b Push SHIFT 4 if the function to be set is highlighted in blue else skip to step c 9 11 12 13 10 14 c Push the front panel button that corresponds to the menu containing the function A main menu 14 for selecting among related functions appears Example Push VERTICAL MENU Note the two labels the top label is a function to choose from the bottom label tells you the current setting for...

Page 60: ...w both schemes 1 Set up a function using pop up menus 18 17 15 16 a For some selections pushing a main menu button pops up a menu 18 of subfunctions Example Push SHIFT then push UTILITY Now push System 17 Note the pop up menu for System is set to I O input output All the main menu buttons to the right of the pop up menu are labeled with subfunctions of I O b Pushing the button that popped up the m...

Page 61: ...the substeps that follow assume you have pushed TRIGGER MENU 20 19 21 a Pushing some main menu buttons displays a side menu with labels containing readouts that you can vary Example Push Level 21 b Pushing the side menu button assigns the knob to control the readout appearing in the button label It also copies the readout to the general purpose knob readout area in the right corner of the screen E...

Page 62: ...icon label settings that show up in side menu labels H The general purpose knob has a readout area at the upper right corner of the screen See Figure 2 1 This readout always reflects the name and value of the function that the general purpose knob is currently controlling H The general purpose knob is affected by the SHIFT button Pressing shift toggles the knob between its fine and coarse modes Fi...

Page 63: ...traverse the file system and to enter characters when naming files Display and Utility Menus Using the techniques described for using menus you can access and change functions in the display menu and utilities menu In the Display menu you can set the following functions H Intensity waveforms readouts and graticule H Style of waveform display s vectors or dots intensified or non intensified samples...

Page 64: ...Operating Information 2 16 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 65: ...l is the low 0 state Signal states may also be described as true meaning their active state or false meaning their non active state The specific voltages that constitute a high or low state vary among the electronic devices Active low signals are indicated by a tilde prefixed to the signal name RE SET Signal names are either active high active low or have both active high and active low states Mod...

Page 66: ...Star This happens after a waveform acquisition is complete if the digital signal processor DSP requests the waveform Processor System The processor system consists of a 68020 microprocessor that controls the entire instrument It includes the firmware program for the oscillo scope The firmware can be reprogrammed by using the GPIB and an external software package The processor system also includes ...

Page 67: ...J The Front Panel Processor also processes the probe coding interface signals The ON STBY switch is not read by the Front Panel Processor The signal passes through the A06 Front Panel board to the A03 CPU board There it s converted to a control signal for the low voltage power supply The GPIB connector provides access to stored waveforms and allows external control of the oscilloscope Other connec...

Page 68: ...he rear panel controls all power to the oscilloscope including the low voltage power supply The ON STBY switch located on the front panel controls all of the power to the oscilloscope except for part of the circuitry in the low voltage power supply The fan provides forced air cooling for the oscilloscope It connects to 12 V on the A01 Backplane through the A07 Auxiliary Power board The battery pro...

Page 69: ...4 7 Advantages These procedures require minimal additional time to perform require no additional equipment other than a standard accessory probe and more completely test the internal hardware of this oscilloscope Use these procedures to quickly determine if the oscilloscope is suitable for putting into service such as when it is first received H If more extensive confirmation of performance is des...

Page 70: ...on Initialize the oscilloscope Press save recall SETUP Now press the main menu button Recall Factory Setup then the side menu button OK Confirm Factory Init H Where instructed to use a front panel button or knob or select from a main or side menu or verify a readout or status message the name of the button or knob appears in boldface type press SHIFT then ACQUIRE MENU press the main menu button Co...

Page 71: ...Waveform Reference Symbols Ground Levels and Waveform Sources Graticule and Waveforms Side menu area Readouts for measurements move here when CLEAR MENU is pressed Main menu display area Readouts in lower graticule area move here when CLEAR MENU is pressed Vertical Scale Horizontal Scale and Trigger Level Readouts Brief Status Information Figure 4 1 Map of Display Functions ...

Page 72: ...Performance Verification Procedures 4 4 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 73: ...r on the digitizing oscilloscope and allow a 20 minute warm up before doing this procedure 1 Verify that internal diagnostics pass Do the following substeps to verify that the internal diagnostics passed a Display the system diagnostics menu H Press SHIFT then press UTILITY H Repeatedly press the main menu button System until Diag Err is highlighted in the menu that pops up H Repeatedly press the ...

Page 74: ... Frequency Response Low Frequency Response and Trigger Skew See Figure 4 2 Verify Pass status for the adjustment sections Run a signal path compensation and verify status is Pass Display the CAL menu 1 2 3 Figure 4 2 Verifying Adjustments and Signal Path Compensation This oscilloscope lets you compensate the internal signal path used to acquire the waveforms you acquire and measure By executing th...

Page 75: ...t in the oscilloscope not meeting warranted performance levels g Wait signal path compensation runs in one to three minutes While it progresses a clock icon shown at left displays on screen When compensation completes the status message updates to Pass or Fail in the main menu see step h h Confirm signal path compensation returns passed status Verify the word Pass appears under Signal Path in the ...

Page 76: ... in the procedures Each verification procedure requires you to set the oscilloscope to certain default settings before verifying functions If you make changes to these settings other than those called out in the procedure you may obtain invalid results In this case just redo the procedure from step 1 When you are instructed to press a menu button the button may already be selected its label will b...

Page 77: ...ay in the selected channel H Set the vertical SCALE to 100 mV Use the vertical POSITION knob to center the waveform vertically on screen H Set the horizontal SCALE to 200 s H Press TRIGGER MENU H Press the main menu button Coupling then press the side menu button HF Rej c Verify that the channel is operational Confirm that the following statements are true H The vertical scale readout for the chan...

Page 78: ...isplays an actively acquiring waveform on screen with the noise displayed H Average mode displays an actively acquiring waveform on screen with the noise reduced like in Hi Res mode e Test all channels Repeat substeps a through d until all input channels are verified 3 Remove the test hookup Disconnect the probe from the channel input and the probe adjust terminal Equipment Required One P6138A pro...

Page 79: ...period to about five divisions c The horizontal POSITION knob positions the signal left and right on screen when rotated 3 Remove the test hookup Disconnect the probe from the channel input and the probe adjust terminal Equipment Required One P6138A probe Prerequisites None 1 Install the test hookup and preset the oscilloscope controls a Hook up the signal source Install the probe on CH 1 Connect ...

Page 80: ...EL TO 50 triggers the signal that you just left untriggered Leave the signal triggered 3 Verify that the delayed trigger system operates a Select the delayed time base H Press HORIZONTAL MENU H Press the main menu button Time Base H Press the side menu button Delayed Triggerable then press the side menu button Delayed Only H Set the horizontal SCALE for the D delayed time base to 200 s b Select th...

Page 81: ...ing oscilloscope controls a Insert the disk in the disk drive b Press save recall SETUP Press the main menu button Recall Factory Setup then press the side menu button Ok Confirm Factory Init c Set the horizontal SCALE to 200 s one click clockwise Notice the horizontal readout now displays 200 s at the bottom of the screen 2 Verify the file system works a Press save recall SETUP Press the main men...

Page 82: ...select the file to recall For example if you followed the instructions above and used a blank disk you had the digitizing oscilloscope assign the name TEK00000 SET to your file g Press the side menu button Recall From Selected File h Verify that the digitizing oscilloscope retrieved the saved setup from the disk Do this by noting that the horizontal SCALE again reads 200 s and the channel 1 baseli...

Page 83: ...an use the form at the end of this section as a test record Read Performance Verification Procedures that start on page NO TAG Also if you are not familiar with operating this digitizing oscilloscope read Operating Information in Chapter 2 of the service manual or read the user manual before doing any of these procedures STOP These procedures extend the confidence level provided by the basic proce...

Page 84: ...male BNC input male BNC output Tektronix part number 011 0102 01 Used to test Video Option 05 equipped oscilloscopes only 5 Cable Precision Coaxial three required 50 Ω 36 in male to male BNC connectors Tektronix part number 012 0482 00 Signal Interconnection 6 Cable Coaxial 75 Ω 36 in male to male BNC connectors Tektronix part number 012 1338 00 Used to test Video Option 05 equipped oscilloscopes ...

Page 85: ...le BNC Tektronix 103 0045 00 Checking Analog Bandwidth 16 Adapter Female N to male BNC Tektronix 103 0058 00 Checking Analog Bandwidth 17 Probe 10X included with this oscilloscope A P6138A probe Tektronix P6138A Signal Interconnection 18 Generator Video Signal Provides NTSC compatible outputs Tektronix TSG 1001 Checking Video Trigger Sensitivity 1 If available items 11 12 13 and 15 can be replaced...

Page 86: ...__ __________ __________ __________ 1 005 V 10 065 V 100 5495 V CH4 Offset 1 V TDS 420A 10 V TDS 460A 99 9 V 995 mV 9 935 V 99 2505 V __________ __________ __________ __________ __________ __________ 1 005 V 10 065 V 100 5495 V DC Voltage Measurement Accuracy Averaged CH1 100 mV 20 8 mV __________ __________ 20 8 mV CH2 100 mV 20 8 mV __________ __________ 20 8 mV CH3 100 mV TDS 420A and TDS 460A ...

Page 87: ...stem DC Coupled Threshold Main Trigger Main Trigger Falling 18 mV 18 mV __________ __________ __________ __________ 18 mV 18 mV Main Trigger Delayed Trigger Falling 18 mV 18 mV __________ __________ __________ __________ 18 mV 18 mV Auxiliary Trigger __________ __________ 10 MHz External Clock __________ __________ 10 MHz Probe Compensator Output Signal Frequency 950 Hz __________ __________ 1050 ...

Page 88: ...kup and preset the instrument controls a Hook up the test signal source H Set the output of a DC calibration generator to 0 volts H Connect the output of a DC calibration generator through a dual banana connector followed by a 50 Ω precision coaxial cable to one side of a BNC T connector see Figure 4 4 H Connect the Sense output of the generator through a second dual banana connector followed by a...

Page 89: ...ll have to press MORE several times to access the Mean measurement H Press CLEAR MENU 2 Confirm input channels are within limits for offset accuracy Do the following substeps test CH 1 first skipping substep a since CH 1 is already set up to be checked from step 1 WARNING High voltages are used in this procedure Before doing this or any other procedure in this manual read the Safety Summary found ...

Page 90: ...tated by Table 4 2 Start with the first setting listed e Check against limits Do the following subparts in the order listed H Subtract the measured mean from the generator setting The result is the offset accuracy H CHECK that the offset accuracy is within the limits listed for the current vertical scale setting H Repeat substeps b through e until all vertical scale settings listed in Table 4 2 ar...

Page 91: ...ector followed by a 50 Ω precision coaxial cable to the other side of the BNC T connector Now connect the BNC T connector to CH 1 Digitizing Oscilloscope DC Calibrator 50 Ω Coaxial Cables Dual Banana to BNC Adapters BNC T Connector Output Sense Figure 4 5 Initial Test Hookup b Initialize the oscilloscope H Press save recall SETUP H Press the main menu button Recall Factory Setup H Press the side m...

Page 92: ... the generator output to 0 V H Press WAVEFORM OFF to remove the channel just confirmed from the display H Press the front panel button that corresponds to the next channel you are to confirm H Press MEASURE H Press the main menu button Select Measurement for CHx then press the side menu button Mean You will have to press MORE several times to access the Mean measurement H Move the test hook up to ...

Page 93: ... the input connector of the channel last tested Equipment Required One sine wave generator Item 11 One level meter and power sensor Item 12 One power splitter Item 13 One Female N to Male BNC Adapter Item 16 Four Male N to Female BNC Adapters Item 15 Two 50 Ω precision cables Item 5 Two 10X attenuators Item 1 Prerequisites See page 4 15 1 Install the test hookup and preset the instrument controls ...

Page 94: ...nnect the sine wave output of a sine wave generator to CH 1 see Figure 4 6 Set the output of the generator to a reference frequency of 10 MHz or less H Set the horizontal SCALE to 50 ns If using a reference other than 10 MHz adjust the horizontal SCALE to display 4 to 6 cycles of the waveform 2 Confirm the input channels are within limits for analog bandwidth Do the following substeps test CH 1 fi...

Page 95: ...DS 430A and TDS 460A not yet checked Start with the 100 mV setting Table 4 3 Analog Bandwidth TDS 420A Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits 100 mV 600 mV 6 divisions 5 ns 200 MHz 424 mV 1 V4 2 V 2 divisions 5 ns 200 MHz 1 414 V 500 mV 2 V 4 divisions 5 ns 200 MHz 1 414 V 200 mV 1 2 V 6 divisions 5 ns 200 MHz 848 mV 50 mV 300 mV 6 divisions 5 ns 200 MHz 212 mV 2...

Page 96: ...o first display the reference signal and then the test signal H Press MEASURE then press the main menu button Select Measurement for CHx H Now press the side menu button more until the menu label Pk Pk appears in the side menu its icon is shown at the left Press the side menu button Pk Pk H Press CLEAR MENU H Set the sine wave generator output if necessary use 10X attenua tors so the CHx Pk Pk rea...

Page 97: ...d in Table 4 3 TDS 420A or Table 4 4 TDS 430A and TDS 460A for the current vertical scale setting H When finished checking set the horizontal SCALE back to the 50 ns setting the setting you used in step 1b STOP Checking the bandwidth of each channel at all vertical scale settings is time consuming and unnecessary You may skip checking the remaining vertical scale settings in Table 4 3 TDS 420A or ...

Page 98: ...Pk measurement until you check a new channel H Install remove 10X attenuators between the generator leveled output and the channel input as is needed to obtain the six division reference signals listed in the tables i Test all channels Repeat substeps a through g for all channels 3 Disconnect the hookup Disconnect the test hook up from the input connector of the channel last tested Equipment Requi...

Page 99: ...ut coupler See Figure 4 8 H Connect the coupler to both CH 1 and CH 2 Ensure that the coupler cables are of equal length Digitizing Oscilloscope Sine Wave Generator Dual Input Coupler 50 Ω Terminator Output Figure 4 8 Initial Test Hookup 2 Confirm all channels are within limits for channel delay a Set up the generator Set the generator frequency to 250 MHz and the amplitude for about five division...

Page 100: ... the rising edge of the left most waveform where it crosses the center horizontal graticule line This is the time reference point for this waveform Note the corresponding time reference point for the right most waveform See Figure 4 9 H Press CURSOR then press the side menu button V Bars H Press CLEAR MENU H Rotate the General Purpose knob to align one cursor to the time reference point of the lef...

Page 101: ... WAVEFORM OFF four times to remove all waveforms H Press CH 1 H Press MORE then press the main menu button Ref 2 H Measure the delay between CH 1 and Ref 2 using the method described in substep f above H CHECK that the cursor readout on screen is 200 ps H If you are testing a TDS 430A skip to step 3 H Press WAVEFORM OFF twice to turn off CH 1 and Ref 2 then press CH 4 to turn on CH 4 H Press MORE ...

Page 102: ...ors 10X and 5X Items 1 and 2 One precision coaxial cable Item 5 Prerequisites See page 4 15 1 Install the test hookup and preset the oscilloscope controls a Hook up the test signal source Connect through a 50 Ω precision coaxial cable the output of a time standard to CH 1 see Figure 4 10 Set the output of the standard to 100 MHz or a period of 10 ns Time Standard Digitizing Oscilloscope 50 Ω Coaxi...

Page 103: ...ress SET LEVEL TO 50 H Press SHIFT then ACQUIRE MENU Now press the main menu button Mode then press the side menu button Average H Use the General Purpose knob to set the number of averages to 8 H Press MEASURE H Press the main menu button High Low Setup then press the side menu button Min Max H Press the main menu button Select Measurement for Ch1 H Press the side menu button more until PERIOD ap...

Page 104: ...ntal SCALE knob to set the D delayed time base to 100 ns H Press the side menu button Delayed Runs After Main then use the General Purpose knob to set Delayed Runs After Main to 10 0 s H CHECK that the rising edge of the waveform crosses the center horizontal graticule line at a point within 0 5 divisions of the center graticule see Figure 4 11 H Use the horizontal SCALE knob to set the D delayed ...

Page 105: ...cy Long Term and Delay Time H Set the horizontal SCALE of the D delayed time base to 500 s The scale of the Main time base will also change H Use the General Purpose knob to set Delayed Runs After Main to 1 00 ms H Use the horizontal SCALE knob to set the D delayed time base to 100 ns H CHECK that the rising edge of the waveform crosses the center horizontal graticule line at a point within 1 5 di...

Page 106: ... source H Set the output of a DC calibration generator to 0 volts H Connect the output of a DC calibration generator through a dual banana connector followed by a 50 Ω precision coaxial cable to one side of a BNC T connector H Connect the Sense output of the generator through a second dual banana connector followed by a 50 Ω precision coaxial cable to the other side of the BNC T connector Now conn...

Page 107: ...ainst limits H Subtract the trigger level readout from the DC calibration generator setting The result is the trigger level accuracy H CHECK that the trigger level is accurate to within ᐔ18 mV H Press TRIGGER MENU Press the main menu button Slope then press the side menu button for negative slope See icon at left Repeat substep b H Subtract the trigger level readout from the DC calibration generat...

Page 108: ...s the side menu button for negative slope See icon at left H Subtract the trigger level readout from the DC calibration generator setting The result is the trigger level accuracy H CHECK that the trigger level is accurate to within ᐔ18 mV 4 Disconnect the hookup a First set the output of the DC calibration generator to 0 volts b Then disconnect the cable from the generator output at the input conn...

Page 109: ...u button Mode Holdoff Now press the side menu button Normal H Press VERTICAL MENU then press the main menu button Coupling Now press the side menu button Ω to select the 50 Ω setting H Press SHIFT then press ACQUIRE MENU Now press the main menu button Mode then press the side menu button Average 16 c Hook up the test signal source Connect through a 50 Ω precision coaxial cable the signal output of...

Page 110: ... CH 1 through a 10X attenuator b Check for Main trigger system for stable triggering at limits H Read the following definition A stable trigger is one that is consistent that is one that results in a uniform regular display triggered on the selected slope positive or negative This display should not have its trigger point switching between opposite slopes nor should it roll across the screen At ho...

Page 111: ...T TO 50 CHECK that a stable trigger is obtained for the test waveform for both the positive and negative slopes of the waveform Use the General Purpose knob to stabilize the trigger if required Press the main menu button Slope then use the side menu to switch between trigger slopes H Leave the delayed trigger system triggered on the positive slope of the waveform before continuing to the next step...

Page 112: ...s b and c only 4 Confirm that the Main and Delayed trigger systems couple trigger signals from all channels Doing the procedure Check Analog Bandwidth which begins on page 4 25 checks coupling If you have not done that procedure do so after finishing this procedure See the following note NOTE Steps 1 through 3 confirmed trigger sensitivity for the Main and Delayed triggering systems using the CH 1...

Page 113: ...then press the side menu button more until Auxiliary appears in the side menu Press the side menu button Auxiliary H Press the Coupling main menu button then press the AC side menu button c Hook up the test signal source H Connect a BNC T connector to the output of the sine wave generator see Figure 4 15 H Connect one 50 Ω cable to one side of the BNC T connector connect a second 50 Ω cable to the...

Page 114: ...able trigger is one that is consistent that is one that results in a uniform regular display triggered on the selected slope positive or negative This display should not have its trigger point switching between opposite slopes nor should it roll across the screen see Figure 4 16 Set a signal with a four division amplitude and a 10 MHz frequency Check for a stable trigger at both the positive and n...

Page 115: ...ry Setup H Press the side menu button OK Confirm Factory Init b Hook up the test signal source H Set the Vertical SCALE to 1 Volt per division H Connect the output of a function generator through a 50 Ω precision coaxial cable and a 50 Ω terminator to the CH 1 input H Set the output of the function generator for a 5 MHz 0 to 4 Volt 4 division square wave at the oscilloscope input H Move the setup ...

Page 116: ...ivision sine wave c Modify the default settings H Press HORIZONTAL MENU then press the Clock main menu button H Press the side menu button External H Set the Max Ext Clock Rate to 10 0 MHz H Press CLEAR MENU d Check external clock H CHECK that the displayed sine wave has a one division period H Slowly adjust the frequency of the function generator to 10 MHz while watching the display H CHECK that ...

Page 117: ...ide menu button OK Confirm Factory Init b Modify the default setup H Set the vertical SCALE to 500 mV H Set the horizontal SCALE to 20 s H Press HORIZONTAL MENU H Press the main menu button Record Length H Press the side menu button 5000 points in 100 divs c Hook up the test signal source Connect through a 75 Ω precision coaxial cable followed by a 75 Ω terminator the output of a NTSC format video...

Page 118: ...GGER MENU H Press the main menu button Mode Holdoff Then press the side menu button Normal b Fine adjust the sync pulse amplitude The amplitude of the TV waveform should now be about 2 divisions pk pk Do the following subparts to fine adjust the vertical gain until the sync pulses measure exactly 0 6 divisions peak to peak using the graticule H Press VERTICAL MENU H Press the main menu button Fine...

Page 119: ... settings appropriate for viewing video waveforms the TRIG D light remains constantly lit H Press TRIGGER MENU Press the main menu button Type twice first to pop up its menu and then to toggle it to Video H Press the main menu button Class to pop up its menu Press it again as needed to toggle it to NTSC H Press the main menu button Scan to pop up its menu H Press the side menu button Odd Center th...

Page 120: ... full lines start the display R2 waveform Note that 1 lines start the display R3 and R4 waveforms Note that with non interlaced both fields scan mode CH 1 switches between the R3 and R4 displays Figure 4 20 Measurement of Video Sensitivity H Rotate the horizontal POSITION control clockwise to move the ends of both fields to the center of the display H CHECK that a stable trigger is obtained while ...

Page 121: ...nter of the display 3 Disconnect the hookup Disconnect the cable from the generator output at the input connector of CH 1 Output Signal Check The procedure that follows checks the characteristics of the probe compensation signal that are listed as checked under Warranted Characteristics in Chapter 1 Specification Equipment Required One standard accessory 10X probe Item 17 Prerequisites See page 4 ...

Page 122: ...NU H Press the main menu button Mode then press the side menu button Hi Res 2 Confirm that the Probe Compensator signal is within limits for amplitude and frequency a Measure the amplitude and frequency of the probe compensation signal H Press MEASURE then press the main menu button Select Measurement for Ch1 H Now repeatedly press the side menu button more until Amplitude appears in the side menu...

Page 123: ...within 950 Hz to 1 050 kHz inclusive and that the readout for Ch1 Ampl is within 475 mV to 525 mV inclusive c Disconnect the test hookup Remove the test probe as desired Sine Wave Generator Leveling Procedure Some procedures in this manual require a sine wave generator to produce the necessary test signals If you do not have a leveled sine wave generator use one of the following procedures to leve...

Page 124: ...f necessary Input Output Figure 4 23 Sine Wave Generator Leveling Equipment Setup 1 Install the test hookup Connect the equipment as shown in Figure 4 23 2 Set the Generator H Set the sine wave generator to a reference frequency of 10 MHz H Adjust the sine wave generator amplitude to the required number of divisions as measured by the digitizing oscilloscope 3 Record the reference level Note the r...

Page 125: ... Item 5 Prerequisites See page 4 15 1 Install the test hookup Connect the equipment as shown in Figure 4 24 start with the sine wave generator connected to the digitizing oscilloscope Digitizing Oscilloscope Level Meter Power Sensor Sine Wave Generator Output Input Connect the sine wave generator to the oscilloscope and the power sensor as directed in the text Figure 4 24 Equipment Setup for maxim...

Page 126: ...r to the new frequency and reference level H Change the sine wave generator to the desired new frequency H Input the correction factor for the new frequency into the level meter H Adjust the sine wave generator amplitude until the level meter again reads the value noted in step 3 The signal amplitude is now correctly set for the new frequency H Disconnect the sine wave generator from the power sen...

Page 127: ...ize the performance of the oscilloscope This procedure is not required to verify the oscilloscope conforms with its warranted characteristics performance verification procedures are found in the Performance Verification starting on page NO TAG As a general rule these adjustments should be done every 2 000 hours of operation or once a year if used infrequently Requirements for Performance Before yo...

Page 128: ...ipment list on page 5 5 lists all test equipment required to adjust this oscilloscope Usage The following topics cover what is required of you when adjusting the oscillo scope and what is done by the software Also the performance of individual adjustments is discussed When using the adjustment software you are not required to manually adjust any circuits The software adjusts the circuits using ext...

Page 129: ...thout removal of the oscilloscope cabinet The adjustment software allows you to make individual adjustments However usually all adjustments are made unless you are adjusting circuits in the course of troubleshooting the oscilloscope Read the information under Complete Adjustment page 5 2 Adjustment After Repair page 5 3 and Adjustment Dependencies page 5 4 before doing an individual adjustment Aft...

Page 130: ...eference Adjustment must pass before any other adjustments can be successfully completed Table 5 2 lists the adjustments and their dependencies Table 5 2 Adjustments and Dependencies Class of Adjustment Prior Completion Requirements Voltage Reference Adjustment None Low Frequency Response Adjustment Voltage Reference High Frequency Response Adjustment TDS 430A and TDS 460A only Voltage Reference T...

Page 131: ... impedance 50 Ω connectors female BNC input male BNC output Tektronix part number 011 0069 02 Software based adjustments 7 Cable GPIB IEEE Std 488 1 1987 IEEE Std 488 2 1987 Tektronix part number 002 0991 01 Software based adjustments 8 Cable Precision Coaxial 50 Ω 36 in male to male BNC connectors Tektronix part number 012 0482 00 Software based adjustments 9 Coupler Dual Input BNC female to dual...

Page 132: ...veled Sine Wave Generator with its leveling head or a TEKTRONIX SG 50302 Programmable Leveled Sine Wave Generator with its level ing head Software based adjustments 15 Generator Pulse High amplitude pulse with variable amplitude of 60 V to 100 V Wavetek 9100 with options 100 and 250 or optionally TEK TRONIX PG 506A Calibration Generator1 Software based adjustments and probe adjustment 16 Head Puls...

Page 133: ... PCII IIA can be configured as either a GPIB PCII or a GPIB PCIIA c If you have more than one GPIB card installed this adjustment software assumes the first card referenced 0 See your GPIB card manual for information on how to determine which card is your 0 card NOTE ALWAYS use this installation procedure when installing this software on a new computer This installation program uses parameters you...

Page 134: ... that are listed for Software based adjustments under Purpose in Table 5 3 starting on page 5 5 1 Hook up the oscilloscope a Connect the GPIB cable Item 7 to the GPIB port at the computer rear panel When multiple GPIB cards are installed connect to the GPIB0 card b Connect the GPIB cable Item 7 to the GPIB port at the oscilloscope rear panel c Power on the oscilloscope 2 Set up the oscilloscope a ...

Page 135: ...ambient temperature Enter the exact ambient temperature within 1_ C Failure to enter the temperature as just specified results in an adjustment of the oscilloscope that can degrade oscilloscope performance across the specified operating temperature range 5 When adjustment is completed a To do a complete adjustment as defined on page 5 2 do the procedure Probe Adjustment on page 5 10 ...

Page 136: ... accessory 1 Install the test hookup and preset the oscilloscope controls Digitizing Oscilloscope Figure 5 1 Hookup for Probe Compensation a Hook up test signal source Install the standard accessory probe to CH 1 Connect the probe tip to PROBE ADJ on the front panel leave the probe ground unconnected b Initialize the oscilloscope H Press save recall SETUP H Press the main menu button Recall Factor...

Page 137: ...press ACQUIRE MENU H Press the main menu button Mode Then press the side menu button Hi Res 2 Compensate the Probe a Locate the probe compensation hole in the side of the probe body see Figure 5 2 b Using the probe compensation tool adjust the probe for best square wave compensation flat as possible across the top of the waveform See Figure 5 3 Figure 5 2 Performing Probe Compensation ...

Page 138: ...d TDS 460A one leveled sine wave generator Item 14 One BNC female to BNC female adapter Item 2 One 50 Ω BNC to probe tip adapter Item 3 One P6138A 10X probe Item 12 1 Install the test hookup and preset the oscilloscope controls a Expose the Inner Probe Tip Follow the instructions in Figure 5 4 NOTE Refer to the Sine Wave Generator Leveling Procedure on page 4 55 if your sine wave generator does no...

Page 139: ...er and pull forward to remove Pull forward to remove the ground lead assembly 3 2 1 Figure 5 4 Exposing the Inner Probe Tip Leveled Sign Wave Generator Digitizing Oscilloscope BNC Female to BNC Female Adapter BNC to Probe Tip Adapter Output Figure 5 5 Initial Test Hookup c Initialize the oscilloscope H Press save recall SETUP H Press the main menu button Recall Factory Setup H Press the side menu ...

Page 140: ... the side menu Press the side menu button Pk Pk H Press CLEAR MENU 2 Confirm probe bandwidth a Display and measure the test signal H Monitor the CH 1 Pk Pk readout while you set the output of the generator for a 600 mV 6 division 10 MHz or less reference signal H TDS 420A Only Set the horizontal SCALE to 2 ns and set the frequency of the generator to 200 MHz H TDS 430A and TDS 460A Only Set the ho...

Page 141: ...t is complete Equipment Required One pulse generator Item 15 One pulse generator head Item 16 One 50 Ω precision cable Item 8 One BNC female to BNC female adapter Item 2 One 50 Ω BNC to probe adapter Item 3 One P6138A 10X probe Item 12 One 10X attenuator Item 5 One probe adjustment tool included with the P6138A probe accessories 1 Install the test hookup and preset the oscilloscope controls a Acce...

Page 142: ... the high amplitude output of a pulse generator through a 50 Ω precision cable to the input of the pulse generator head see Figure 5 7 H Connect the output of the pulse generator head through a 10X attenuator to CH 1 H Set the triggering level of the pulse generator head to minimum Pulse Generator Digitizing Oscilloscope Pulse Generator Head 10X Attenuator Precision Cable Output Figure 5 7 Initial...

Page 143: ...side menu button Hi Res H Press CLEAR MENU 2 Adjust the Probe a Display and store the reference signal H Set the high amplitude output of the generator for 60 to 100 V at the input to the pulse generator head see Figure 5 8 H Advance the triggering level of the pulse generator head until a five to six division square wave appears on screen H Push SET LEVEL TO 50 as required to trigger the signal H...

Page 144: ... H Install the probe on CH 1 H Plug the probe tip from the probe into the BNC to probe tip adapter H Press the main menu button Coupling Then press the side menu button Ω to toggle to 1 MΩ coupling H Press HORIZONTAL MENU H Press the main menu button Trigger Position press the side menu button 10 c Make the adjustments H Locate the various adjustments in Figure 5 9 H Manually adjust the front corn...

Page 145: ... Probe Bandwidth H Redo the procedure Measure the Probe Bandwidth to check if the probe now meets its bandwidth requirement H If bandwidth is met adjustment is complete Skip to step 3 H If bandwidth is not met redo this procedure increasing front corner overshoot slightly relative to the stored waveform H Repeat this step d until bandwidth is met ...

Page 146: ...etween front corners 3 Repeat the first two steps as needed due to interaction between adjustments 5 ns C1 20 ns R1 10 ns R2 Positive Pulse Negative Pulse Figure 5 10 Adjustments vs Front Corner Response 3 Disconnect the hookup Unplug the probe from the BNC to probe tip adapter Reverse the instructions in Figure 5 4 page 5 13 to reinstall the retractable probe tip ...

Page 147: ... on page 5 2 CAUTION Static electricity can damage this circuitry When standing the CRT on its front panel place it on a clean padded surface The equipment required to do this procedure is listed in Table 5 3 Equipment Required One J17 Photometer with a J1803 Luminance Probe Item 17 One monitor adjustment tool Item 4 1 Access the inside of the oscilloscope See the Removal and Installation Procedur...

Page 148: ... H Allow 15 to 20 minutes for the oscilloscope to warm up H Press SHIFT and UTILITY H Repeatedly press the main menu button System until Diag Err is highlighted in the pop up menu H Repeatedly press the main menu button Area until Display is highlighted in the pop up menu H Repeatedly press the side menu button more until Circle appears in the side menu Push Circle H Press the main menu button EXE...

Page 149: ...IN L400 H SIZE L310 FOCUS R411 Figure 5 11 Monitor Adjustment Locations 4 Adjust the display contrast a Display the White Box test pattern H Press the center main menu button to display the main menu H Press the main menu button Tests H Repeatedly press the side menu button more until White Box appears in the side menu Push White Box H Press the main menu button EXECUTE Then press the side menu bu...

Page 150: ...inance probe H Adjust R483 VID GAIN for a reading of 100 foot lamberts 343 candelas H If R483 needed a large adjustment perform the brightness adjust ment again 5 Adjust the display focus a Display the Composite test pattern H Press the center main menu button to display the main menu H Press the main menu button Tests H Repeatedly press the side menu button more until Composite appears in the sid...

Page 151: ...Adjust R411 for best overall focusing at all four corners and at the center of the screen see Figure 5 13 Center Corner Corner Corner Corner Figure 5 13 Composite Pattern for Focusing 6 Restore the oscilloscope to normal operation a Restore the dip switch to the settings that follow Switch No 1 2 3 4 5 6 7 8 Open Closed X X X X X X X X ...

Page 152: ...rocedures 5 26 TDS 420A TDS 430A TDS 460A Service Manual b Power off the oscilloscope c See the Removal and Installation Procedures starting on page 6 9 to reinstall the cabinet and other modules removed in step 1 ...

Page 153: ...tic routines to speed fault isolation to a module Service personnel must be prepared to safely service the oscilloscope This manual is for qualified service personnel only Read the General Safety Summary and the Service Safety Summary at the front of this manual If you are unfamiliar with the operation of this oscilloscope read Operating Information Chapter 2 before servicing the oscilloscope To p...

Page 154: ...avoid damaging internal modules and their components due to electrostatic discharge ESD 1 Minimize handling of static sensitive modules 2 Transport and store static sensitive modules in their static protected containers Label any package that contains static sensitive modules 3 Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Do ...

Page 155: ...ity Levels1 MOS or CMOS microcircuits or discrete circuits or linear microcircuits with MOS inputs most sensitive 1 ECL 2 Schottky signal diodes 3 Schottky TTL 4 High frequency bipolar transistors 5 JFET 6 Linear microcircuits 7 Low power Schottky TTL 8 TTL least sensitive 9 1 Voltage equivalent for levels voltage discharged from a 100 pF capacitor through resistance of 100 ohms 1 100 to 500 V 6 6...

Page 156: ...loscope as often as operating conditions require The collection of dirt on components inside can cause them to overheat and break down Dirt acts as an insulating blanket preventing efficient heat dissipation Dirt also provides an electrical conduction path that could cause an oscilloscope failure especially under high humidity conditions CAUTION Avoid the use of chemical cleaning agents which migh...

Page 157: ...ting moisture inside the oscilloscope during external cleaning use only enough liquid to dampen the cloth or applicator 1 Remove loose dust on the outside of the oscilloscope with a lint free cloth 2 Remove remaining dirt with a lint free cloth dampened in a general purpose detergent and water solution Do not use abrasive cleaners 3 Clean the monitor screen with a lint free cloth dampened with eit...

Page 158: ... pins Firmly seat loose semiconduc tors Remove devices that have distorted pins Carefully straight en pins as required to fit the socket using long nose pliers and reinsert firmly Ensure that straightening action does not crack pins causing them to break off Wiring and cables Loose plugs or connectors Burned broken or frayed wiring Firmly seat connectors Repair or replace modules with defective wi...

Page 159: ...d panels see Removal and Installation Procedures on page 6 9 5 Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the majority of the alcohol to evaporate 6 Use 49_ to 60_ C 120_ to 140_ F deionized water to thoroughly rinse the parts 7 Dry all parts with low pressure deionized air 8 Dry all components and assemblies in an oven or drying compartment using 52_ to 65_ C 125_ t...

Page 160: ...Maintenance 6 8 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 161: ...tains the following information H This preparatory information that you need to properly do the procedures that follow H A list of equipment required to remove all modules H Procedures for removal and reinstallation of the electrical and mechanical modules H A disassembly procedure for removal of all the major modules from the oscilloscope at one time and for reassembly of those modules into the o...

Page 162: ... by doing the procedure Access Procedure page 6 13 By following the instructions in that procedure you remove the module to be serviced while removing the minimum number of additional modules The procedures are described in the order in which they appear in this section In addition you can look up any procedure for removal and reinstallation of any module in the Table of Contents of this manual H ...

Page 163: ...Removal and Installation Procedures TDS 420A TDS 430A TDS 460A Service Manual 6 11 NOTE Read the cleaning procedure before disassembling the oscilloscope for cleaning Figure 6 1 Oscilloscope orientation ...

Page 164: ...4 Torque wrench 8 inch lbs torque accepts TorxR driver bits 5 Flat bladed screwdriver Screwdriver for removing standard headed screws 6 Pozidriv screwdriver Used for removing disk drive 7 Needle Nose Pliers Standard tool Used for removing EMI gaskets 8 Duck bill pliers 4 inch Used for removing the low voltage power supply 9 Nutdriver 5 16 inch Used for removing earth ground cables 10 Angle Tip Twe...

Page 165: ...includes the name of the module noted in step1 H Perform the access instructions listed for the procedure found to access and remove the module H Skip to the end of this procedure step 3 for reinstallation instructions b If you have found the module to be removed in either Figure 6 3 or Figure 6 4 cabinet removal is required H First do Line Fuse and Line Cord on page 6 26 removing only the line co...

Page 166: ... includes the name of the cable noted in step 1 H Perform the instructions listed in the table for that procedure to access and remove the cable H Follow the instructions listed in the table for the reinstallation of the cable Then exit this procedure 3 Reinstall all modules removed Read the instructions found at the end of the procedure that removes the module to be serviced they guide you in rei...

Page 167: ... and Front EMI Gaskets 6 31 1 Do Line Fuse and Line Cord removing only the line cord 2 Do Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet removing only the rear cover and cabinet 3 Do the procedure listed at left removing all modules including the module s you want to service 5 Disk Drive 6 34 1 Do Line Fuse and Line Cord removing only the line cord 2 Do the Front Cover ...

Page 168: ...asket Line Cord Rear Cover Front Cover optional ESD Shield Trim Ring Menu Flex Circuit A06 Front Panel Assembly Front Panel Knobs Front EMI Gaskets 4 Probe Code Flex Assembly Cabinet Menu Button Mounting Screw Front Panel Shafts Fuse Cap Line Fuse Menu Elastomer Disk Drive Figure 6 2 Cabinet and front panel mounted modules ...

Page 169: ...remove the module 5 A02 Display Assembly 6 47 1 Do A08 Jumper Board Assembly D1 Bus and Board Supports Do not remove the A08 jumper board assembly 2 Do the procedure listed at left to remove the module 6 A09 DSP Assembly 6 48 1 Do A08 Jumper Board Assembly D1 Bus and Board Supports Do not remove the A08 jumper board assembly 2 Do the procedure listed at left to remove the module 7 A01 Backplane As...

Page 170: ...t Procedure Including Module to be Removed Access Instructions Page No 12 Back Up Batteries 6 53 1 Do the procedure listed at left to remove the module 13 A04 Acquisition Assembly 6 69 1 Do A08 Jumper Board Assembly D1 Bus and Board Supports see page 6 44 Do not remove the board supports 2 Do the procedure listed at left to remove the module ...

Page 171: ...Mounting Screws A09 DSP Assembly Board Support 3 A04 Acquisition Assembly Mounting Screw A08 Jumper Assembly A05 Attenuator Assembly Mounting Screw Mounting Screw BNC Connector Mounting Screws Battery 2 Battery Clamp 2 Cable Retainer Mounting Screw Mount Backplane and LV Power Supply Attenuator Shield D1 Bus A03 CPU Assembly A25 Low Voltage Power Supply Assembly Fan Mounting Screw Power Factor Cor...

Page 172: ...cedure A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits in Table 6 6 2 Follow the access instructions found there to access and remove the front panel assembly The cables plugged into that assembly are removed in the process 3 Unplug the cable to be replaced from the backplane assembly See Figure 6 4 for jack location 4 Reverse these instructions to install the replac...

Page 173: ...ving the line filter to ground lug cable unplug it from the line filter lug See Figure 6 4 3 Using a 5 16 inch nut driver Item 9 remove the nut s that secure the cable to be removed from the lug and remove it 4 Reverse these instructions to install the replacement cable 7 Monitor 1 Find the procedure A02 Display Assembly in Table 6 6 2 Follow the access instructions found there to access and remov...

Page 174: ... to Aux Power Supply Aux Supply to Line Filter Line Filter to Ground Lug Aux Supply to Low Voltage Power Supply to Ground Lug D1 Bus Backplane to Attenuator Soldered at Backplane CPU to Front Panel Backplane to Acquisition Soldered at Backplane Backplane to Front Panel Disk Drive to Display Figure 6 4 Cables and cable routing B010100 B079999 ...

Page 175: ...red at Backplane Backplane to Front Panel Disk Drive Display CRT Power Line Trigger Figure 6 5 Cables and cable routing B080000 up Procedures for Module Removal and Installation Do the Access Procedure page 6 13 before doing any procedure in this section 1 Assemble equipment and locate modules to be removed Have handy a pair of angled tip tweezers Item 10 Find the knob s to be removed on the front...

Page 176: ... clearance between the base of the knob and the front panel b Insert the tweezers between the knob and front panel and use them to remove the knob and its shaft 4 Disassemble the knob and shaft Pull the shaft out of the knob 5 Reinstallation a To reinstall align the inside of the knob to the end of the shaft and push it in until it snaps b Insert the shaft of the assembled knob into its hole in th...

Page 177: ...allation Procedures TDS 420A TDS 430A TDS 460A Service Manual 6 25 When reinstalling the knobs note there are two sizes Be sure to reinstall the proper size knob in the proper location Figure 6 6 Knob and shaft removal ...

Page 178: ...fuse and line cord in the locator diagram Cabinet and Front Panel Mounted Modules Figure 6 2 on page 6 16 2 Orient the oscilloscope Set the oscilloscope so its bottom is down on the work surface and its rear is facing you If you are servicing the line cord do the next step if you are servicing the line fuse skip to step 5 3 Remove line cord a Find the line cord on the rear cover See Figure 6 7 Unp...

Page 179: ...t is not install it by snapping its edges over the trim ring c Locate the rear cover and cabinet in the locator diagram Cabinet and Front Panel Mounted Modules Figure 6 2 on page 6 16 2 Orient the oscilloscope a Pull out on both of the hubs on the cabinet handle to unlock it for positioning While holding the hubs unlocked rotate the handle towards the bottom of the oscilloscope b Set the oscillosc...

Page 180: ...I Gasket Access from the front of the cabinet Front Foot Rotate and remove Handle Assembly Remove the internal screws and pull out handle hubs to remove Mounting Screws 4 Label Label Mounting Screw Figure 6 8 Front cover rear cover cabinet emi gasket and cabinet handle and feet removal ...

Page 181: ...f the cabinet grasp the two handle hubs and pull them outward from the cabinet until they are out of the cabinet c While holding the handle hubs pulled out lift the handle away to remove STOP DO NOT do step 7 to remove the EMI gasket from the rear of the cabinet unless it must be replaced due to damage If you are not replacing that gasket skip to step 8 When reinstalling the EMI gasket and the osc...

Page 182: ... or snag the cabinet on internal cabling redress cables an necessary H When sliding the cabinet onto the oscilloscope be sure that the ridge around the rear of the main chassis slides into the groove containing the EMI gasket on the rear of the cabinet H Install the four screws at the rear panel and tighten to 8 inch lbs torque before installing the single screw at the left side of the cabinet Tig...

Page 183: ...scope When reinstall ing align and snap the cover back on STOP DO NOT touch the carbon contact points on the menu elastomer installed in the trim ring Also do not touch the contacts on the menu button flex circuit exposed when you remove the trim ring You should wear clean cloth gloves that are free of lint when handling the menu elastomer or when touching the menu button flex circuit mounted on t...

Page 184: ...n the trim ring b If the menu elastomer was removed align it over the menu button holes in the trim ring and press it in to install Avoid touching the carbon contact points on the elastomer c Without installing the EMI gaskets align the trim ring to the front of the chassis and push it on to seat Be sure that both pairs of flex locks one pair each at the inside top and bottom of the trim ring snap...

Page 185: ...re 6 9 on page 6 31 and press firmly to install f See the following procedures to install those modules removed by the access procedure H Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover H Line Fuse and Line Cord page 6 26 to reinstall the line cord which completes the oscilloscope reassembly Spudger EMI Gaskets 4 Figure 6...

Page 186: ... you Remove T 15 Torx drive screw see text J1 Remove securing screw see text Figure 6 11 Disk drive removal 3 To remove the disk drive perform the following steps using Figure 6 11 as a guide a Lift up on the two locking tabs on J1 of the disk drive b Remove the cable from the drive c If present remove the T 15 Torx drive screw that clamps the drive in the chassis When replacing the drive do not r...

Page 187: ... screwdriver Item into the slot at the front right of the chassis Push inwards to release the snap lock at the right side see Figure 6 12 b Lift the front panel assembly out of the front of the main chassis until you can reach the interconnect cables connecting it to various other modules c Unplug the following cables from their jacks on the front panel assembly H The menu flex circuit at J103 H T...

Page 188: ...is STOP Perform step 7 only if disassembling for cleaning and lubrication Components removed in step 7 are not field replaceable Otherwise skip to step 8 to continue this procedure 7 Further disassembly of front panel assembly If the front panel or the front panel buttons are to be serviced do the following substeps a Remove the front panel control knobs from the front panel assembly using the met...

Page 189: ...nobs and Shafts Flex the latches 3 downward to release board Then rotate the board and pull it down Figure 6 13 Disassembly of the front panel assembly STOP Perform step 8 only if replacing a failed or damaged menu flex circuit with a fresh unit from the factory Removal of the circuit is likely to destroy it If such is not the case skip to step 9 to continue this procedure 8 Remove the menu flex c...

Page 190: ...heres to the chassis H Clean the surface of the menu flex circuit just installed using isopropyl alcohol and a clean lint free cloth b See step 6 to install the probe code flex circuit if it was removed c See step 5 to install the ESD shield if it was removed d If the front panel assembly was disassembled for cleaning in step 7 apply a thin coating of bearing grease Dow Corning 1292 to the two swi...

Page 191: ...uator assembly to the front of the chassis c Lift the attenuator assembly away from the oscilloscope to complete its removal 5 Reinstallation a Perform in reverse order substeps 4a and 4c reversing the removal instructions in each substep to reinstall the assembly b See the following procedures in the order listed to replace modules removed by the access procedure H A06 Front Panel Assembly ESD Sh...

Page 192: ...Removal and Installation Procedures 6 40 TDS 420A TDS 430A TDS 460A Service Manual Mounting Screws 4 Attenuator Shield A05 Attenuator Assembly Figure 6 14 A05 Attenuator removal ...

Page 193: ...ly injuring you Wear protective clothing including safety glasses preferably a full face shield Avoid striking the display tube with or against any object Monitor storage Store the monitor with its display tube face down in a protected location placing it on a soft nonabrasive surface to prevent scratch ing the face plate 4 Remove the monitor a Take the precautions outlined in the WARNING above Re...

Page 194: ...e it face down on a soft nonabra sive surface to prevent scratching the face plate 5 Reinstallation a Perform in reverse order 4a 4f reversing the removal instructions in each step and substep to reinstall the assembly If the EMI clips on the monitor are replaced be sure to center them in the notched area of the top and bottom of the chassis b See the following procedures in the order listed to re...

Page 195: ...Removal and Installation Procedures TDS 420A TDS 430A TDS 460A Service Manual 6 43 A26 Monitor Assembly Mounting Screws 6 Monitor Frame EMI Clip Figure 6 15 A26 Monitor assembly removal ...

Page 196: ...or the second and third board supports See Figure 6 16 4 Remove the D1 Bus Grasp the D1 bus by its cable pull tab and pull to unplug it from J1 of the Display assembly Then grasp the cable and pull to unplug it from J3 of the acquisition assembly and J2 of the DSP assembly See Figure 6 16 5 Remove the jumper board assembly Grasp the jumper board assembly by opposite edges and pull out to unplug it...

Page 197: ...nel cable from the CPU assembly at J101 b Lift up on the two locking tabs on J500 of the CPU assembly c Remove the cable from the drive d Remove the single T 15 TorxR screw from the bracket covering the unused rear panel slot at the inside rear corner of the main chassis or the two screws from the bracket that secures the option assembly at the inside rear corner of the main chassis e Remove the s...

Page 198: ... CPU assembly and route directly through the chassis opening to the front pa nel cavity b See the following procedures in the order listed to replace modules removed by the access procedure H A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 board supports H Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover H...

Page 199: ...assis c Remove the single T 15 TorxR screw from the bracket that secures the display assembly at the inside rear corner of the main chassis d Working from the rear of the oscilloscope remove the single T 15 TorxR screw from the bracket that secures the display assembly to the rear of the main chassis e Grasp the board by its edge and pull outward to unplug it from J4 of the backplane assembly to c...

Page 200: ...r with a size T 15 TorxR tip Items 1 and 2 b Locate the modules to be removed in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its left side is down with its front facing to the left of you 4 Remove the DSP Assembly Use Figure 6 19 as a guide perform the following substeps a Unplug the battery backup cable at J5...

Page 201: ... and pull outward to unplug it from J5 of the backplane assembly to complete the removal 5 Reinstallation a Perform in reverse order substeps 4a 4e reversing the removal instruc tions in each substep to reinstall the assembly b See the following procedures in the order listed to replace modules removed by the access procedure H A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 board...

Page 202: ...bsteps a There may be board brackets mounted on the rear panel that correspond to unused board slots or options in the backplane assembly For any bracket do the following subparts to remove it H Remove the T 15 TorxR screw s that secure s the bracket at the inside rear corner of the main chassis H Working from the rear of the oscilloscope remove the T 15 TorxR screw s from the bracket s that secur...

Page 203: ... the chassis h Turn the digitizing oscilloscope so its bottom is facing down on the work surface Leave its front facing to the left i Find the flex lock nearest the front of the digitizing oscilloscope Using a flat bladed screwdriver push the flex lock so it flexes enough to clear the board j While holding the flex lock slightly pull up on the front corner of the board nearest that retainer until ...

Page 204: ...p to reinstall the assembly Observe the following precautions as you do the substeps H Be sure to guide the backplane to attenuator and backplane to acquisition cables up through their slots in the bottom of the chassis when doing step 4l H Be sure to align the board to the retainer slot when doing step 4k H Seat the board until the four retainers snap over the edge of the backplane assembly when ...

Page 205: ...and saved waveforms Adjustment constants stored internally when the oscilloscope is adjusted are not lost 1 Assemble equipment and locate modules to be removed Locate the back up battery to be removed in the locator diagram Internal Modules Figure 6 3 page 6 19 2 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its top is down on the work surface with its right side facing you...

Page 206: ...instructions to reinstall the each battery clip b Do steps 3 and 4 reversing the removal instructions to reinstall the each battery c See the following procedures in the order listed to replace modules removed by the access procedure H Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover H Line Fuse and Line Cord page 6 26 to ...

Page 207: ...ting on the work surface and the rear panel facing you 4 Remove the Power Factor Correction Module a Remove the four screws that secure the module bracket to the rear subpanel b Remove the two screws that attach the new air baffle shield Locate the screws in Figure 6 22 One screw is down in the chassis at the inner edge of the PFC module and the other is up on the edge of the chassis c Remove the ...

Page 208: ...r Flex cable two connector line trigger Figure 6 22 Power factor correction module removal B080000 up e Disconnect P3 connector located on the low voltage power supply board f Disconnect the remaining two conductor black and red connector located on low voltage power supply board g Lift the Power Factor Module assembly up and at the same time disconnect the two conductor flex cable line trigger fr...

Page 209: ... the low voltage power supply and if it is to be removed the power supply mount in the locator diagram Internal Modules Fig ure 6 3 on page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is down on the work surface and its front is facing to the right CAUTION When releasing the low voltage power supply from its mount take care not to push on the board compo...

Page 210: ...ening created when the fan was removed Access Procedure remove the T 15 TorxR screw at the center of the power supply board h Using a pair of duck bill pliers squeeze to release each of the four flex locks at the top edge of the low voltage power supply assembly i Once released tilt the board out away from the flex locks j Lift the low voltage power supply assembly out of the chassis to complete i...

Page 211: ...able Figure 6 23 A24 Low voltage power supply removal B080000 up 5 Reinstallation a Perform in reverse order substeps 4a 4j reversing the removal instruc tions in each substep to reinstall the assembly Be sure to seat the board until all of the four flex locks are locked b See the following procedures to replace the modules removed by the access procedure H Front Cover Rear Cover Cabinet Rear EMI ...

Page 212: ...AUTION When releasing the low voltage power supply from its mount take care not to push on the board components Rather push on the board edge when performing the following step and its substeps 4 Remove the low voltage power supply a Unplug the cable coming from the backplane assembly at J2 b Unplug the cable coming from the AUX power supply at J1 c Working through the opening created when the fan...

Page 213: ... 24 A25 Low voltage power supply removal B010100 B079999 STOP DO NOT do step 5 unless servicing a broken power supply mount or removing that mount for cleaning 5 Remove the power supply mount a Place the digitizing oscilloscope so its left side is down with its top facing you b Depress the two retainer locks and slide the power supply mount towards the top of the digitizing oscilloscope to unlock ...

Page 214: ...ssembly H See A09 DSP Assembly on page 6 48 to reinstall that assembly H See A03 CPU Assembly on page 6 45 to reinstall that assembly H See A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 to reinstall the board supports and D1 bus only b Perform in reverse order substeps 4a 4j reversing the removal instruc tions in each substep to reinstall the assembly Be sure to seat the board u...

Page 215: ... two flex locks securing the top of the fan to the fan mount then lift the fan out from the top of the chassis c When reinstalling the fan be sure the two locks snap into place to secure the fan STOP DO NOT do step 5 unless servicing a broken fan mount or removing that mount for cleaning 5 Remove the fan mount a Rotate the digitizing oscilloscope so the side that houses the fan mount is facing upw...

Page 216: ...n mount was removed perform in reverse order substeps 5a 5d reversing the removal instructions in each substep to reinstall the fan mount Be sure to seat the fan mount so its two flex locks snap to secure it on the chassis b Do in reverse order substeps 4a 4c to reinstall the fan c See the following procedures to replace the modules removed by the access procedure H Front Cover Rear Cover Cabinet ...

Page 217: ...driver with a size T 15 TorxR tip Items 1 and 2 Locate the line filter in the locator diagram Internal Modules Figure 6 3 page 6 19 3 Orient the digitizing oscilloscope Set the digitizing oscilloscope so its bottom is down on the work surface and its rear is facing you 4 Remove the line filter Refer to Figure 6 26 when doing the following substeps a Unplug the three connectors at the line filter b...

Page 218: ...er you have done so be sure to install the earth lead and its nut from the line filter before installing the earth lead and its nut from the low voltage power supply a Do in reverse order substeps 4a 4b reversing the removal instructions in each substep to reinstall the assembly b See the following procedures to replace the modules removed by the access procedure H Front Cover Rear Cover Cabinet R...

Page 219: ...cable from the backplane assembly at J7 and the cable from the low voltage power supply assembly at J1 of the low voltage power supply assembly b Using a 5 16 inch nut driver remove the nut s that secure the cable from the lug and remove it When replacing the cables on the ground lug install the cable from the line filter last c Now release and disconnect the remote power cable where it joins the ...

Page 220: ... 6 27 Auxiliary power supply removal B010100 B079999 5 Reinstallation a Perform in reverse order substeps 4a 4e reversing the removal instruc tions in each substep to reinstall the assembly Be sure to seat the board until the two mounting posts snap locked on the assembly when reinstalling ...

Page 221: ...tes the oscilloscope reassembly 1 Access the module Be sure you have performed the Access Procedure on page 6 13 and removed the modules as instructed 2 Assemble equipment and locate modules to be removed Have handy a screwdriver with a size T 15 TorxR tip Items 1 and 2 Locate the acquisi tion assembly in the locator diagram Internal Modules Figure 6 3 on page 6 19 3 Orient the digitizing oscillos...

Page 222: ...ep to reinstall the assembly b See the following procedures in the order listed to replace modules removed by the access procedure H A08 Jumper Board Assembly D1 Bus and Board Supports on page 6 44 to install the jumper board and D1 bus only H Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 to reinstall the cabinet and rear cover H Line Fuse and Line Cord page ...

Page 223: ...d screwdriver Item 5 a pair of angle tip tweezers Item 10 duck bill pliers Item 8 flat bladed spudger Item 11 and a soldering iron Item 12 b Familiarize yourself with the modules illustrated in Figures 6 2 6 3 and 6 4 on pages 6 16 6 19 and 6 22 respectively 2 Remove all modules Do in the order listed the following procedures They are found under Procedures for Module Removal and Installation whic...

Page 224: ... ing a cable or bus to a module that you have not yet installed You will make the necessary connections when you install the missing module later H Ignore any instructions to do the Access Procedure The access procedure is only used when removing individual modules for servicing not when doing a disassembly reassembly for cleaning H Ignore any instructions directing you to see other procedures to ...

Page 225: ...Voltage Power Supply and its Mount page 6 57 n Fan and Fan Mount page 6 63 o Trim Ring Menu Elastomer Menu Buttons and Front EMI Gaskets page 6 31 p Disk Drive page 6 34 q A06 Front Panel Assembly ESD Shield and Menu Flex and Probe Code Flex Circuits page 6 35 r Front Cover Rear Cover Cabinet Rear EMI Gasket and Cabinet Handle and Feet page 6 27 s Line Fuse and Line Cord page 6 26 ...

Page 226: ...Removal and Installation Procedures 6 74 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 227: ...isolating faulty modules Both levels of internal diagnostics report any bad modules or interfaces If the diagnostics do find a bad module or interface use the troubleshooting procedures in this section to determine which module needs to be replaced The two levels of diagnostics are the short confidence set and an extended set that tests the oscilloscope circuitry in depth and takes more time At po...

Page 228: ...README file located on the first disk The firmware update kit is listed as an optional accessory in Chapter 10 NOTE You must set both switches of the Protection switch to the unprotected position before updating the firmware Figure 6 29 shows how to set the switch After loading the firmware be sure you set both switches back to the protected position and cycle power If you want to order a firmware...

Page 229: ...he TDS 420A or 400 MHz for the TDS 430A and TDS 460A digitizing oscil loscope TEKTRONIX TDS 430A TDS 420A or TDS 460A General troubleshooting The console port allows you to see detailed diagnostic messages when faults in the oscilloscope prevent display of the normal diagnostics Use this procedure to set up the console port NOTE You may need a DB 9 to DB 25 adaptor null modem adaptor gender change...

Page 230: ...ng the equipment Attach the console port cable to J3 on the A03 CPU module see Figure 6 30 and using an extender cable or adaptors to the RS 232 serial port of your personal computer or RS 232 terminal 5 Configure the personal computer a Load the software Load telecommunication terminal software into your personal computer b Select the software port Configure the telecommunication software so that...

Page 231: ... mode After configuring the software parameters switch the software to terminal mode 6 Use the console port Power up the oscilloscope Diagnostic messages are echoed to the personal computer display Console Port Tektronix part number 174 2613 00 Extension Cable Figure 6 30 Console port connections ...

Page 232: ... of S2 on the A03 CPU module to their open positions Set all switches of S1 back to the closed position and cycle power Is the display readable and stable Yes No No Yes Yes No Perform the Monitor troubleshooting procedure There is something wrong with the ON STBY button Perform the Backplane troubleshooting procedure No Yes Does DS1 first flash 8 then display a sequence of hex numbers from 1 e wit...

Page 233: ...Troubleshooting TDS 420A TDS 430A TDS 460A Service Manual 6 81 P1 Pin 3 Pin 1 Pin 32 Figure 6 32 A03 CPU Board Connector P1 ...

Page 234: ... and you can read the display Does the display report any errors Select the extended diagnostics menu and run all the tests for additional diagnostics information see Diagnostics on page 6 75 Are any failures reported The oscilloscope is ok Yes No Is the selected module the A05 Attenuator A04 Acquisition or the A08 Jumper board Using the troubleshooting procedures did you find a faulty module Perf...

Page 235: ...k plane D1 Cable Acq Cable Attn Cable Attn Acq Jumper Board Front Panel Cables Fp Cpu 1 2 3 4 5 Cal Initialization 1 Cpu Dsp or AT bus 2 1 3 4 Dsp 1 2 4 3 Cpu Dsp Dsy or D1 bus 3 1 4 2 Cpu Dsp Dsy or AT bus 1 2 3 4 Dsy 3 1 4 2 Cpu Attn or I2C bus 2 1 4 3 3 Attn 1 3 2 Cpu Acq D1 I2C bus 5 4 1 2 3 Acq 3 1 4 5 2 Acq Attn 2 3 4 1 Fp Cpu 3 2 1 ...

Page 236: ...place the A07 Auxiliary Power board No Yes Is there power at the line cord and outlet Replace the line filter Fix the power problem Are all secondary voltages within specification see Table 6 11 and Figure 6 36 Replace either the A01 Backplane or the A03 CPU boards Press principal power switch S1 to the off out position Disconnect the cable P2 to the A01 Backplane Connect a minimum 1 A load to the...

Page 237: ...g TDS 420A TDS 430A TDS 460A Service Manual 6 85 Table 6 11 Normal Output Voltage Supply J2 Pin Minimum Output Maximum Output 5 1 V 20 5 05 V 5 15 V 15 V 8 14 85 V 15 15 V 6 4 V 6 6 35 V 6 45 V 15 V 2 14 85 V 15 15 V ...

Page 238: ...oes the supply work ok when a specific board or cable is removed Replace board or cable that has the fault Does the supply work ok when all boards and cables are removed Replace the A01 Backplane No Yes Does the supply work ok when the load is reduced by removing or disconnecting one or more boards or cables but not due to an overload or short on a specific board or cable Replace the A25 Low Volta...

Page 239: ...anual 6 87 Table 6 12 Power Supply Maximum Current Supply J2 Pins Maximum Current 5 1 V 16 20 15 A 15 V 8 and 9 3 5 A 6 4 V 6 and 7 5 5 A 15 V 1 and 2 0 75 A A25 Low Voltage Power Supply J2 Pin 1 Figure 6 36 A25 Low Voltage Power Supply Module Right Side ...

Page 240: ...obe J7 and J4 Perform the Low Voltage Power Supply troubleshooting procedure Does pin 7 of the cable have a video signal with the same levels as Figure 6 39 No Yes No Yes This procedure helps you determine whether the A26 Monitor or the A02 Display module is bad Is J7 pin 1 at 15 V see Figure 6 41 Is J4 pin 1 at 15 V see Figure 6 41 Replace the A07 Auxiliary Power module No Yes Replace the cable D...

Page 241: ...Manual 6 89 J2 pin 2 Horizontal Sync 31 75 kHz Rate J2 pin 4 Vertical Sync 60 Hz Rate Figure 6 38 Horizontal and Vertical Sync Signals J2 pin 7 Video Blanking Level White Level Black Level Figure 6 39 A Video Signal with White Black and Blanking Levels ...

Page 242: ...Troubleshooting 6 90 TDS 420A TDS 430A TDS 460A Service Manual J440 Figure 6 40 A26 Monitor Connector J440 J7 Pin 1 J4 Pin 1 Figure 6 41 A07 Auxiliary Power Connectors J4 and J7 ...

Page 243: ...Troubleshooting TDS 420A TDS 430A TDS 460A Service Manual 6 91 J2 Pin 1 Figure 6 42 A02 Display Connector J2 ...

Page 244: ...t panel LEDs turn on at all No Yes No Yes Are the correct voltages at J101 and J106 see Figure 6 44 and Table 6 13 Replace the A06 Front Panel module No Yes Does one front panel LED turn on and then turn off followed by the next LED until all LEDs have turned on and then turned off The A06 Front Panel board is ok Are all front panel cables securely installed in their sockets and are the cables ok ...

Page 245: ...ual 6 93 J106 Pin 1 J107 Pin 1 Figure 6 44 A06 Front Panel Board Power Connectors J101 and J106 Table 6 13 Front Panel Connector Voltages Connector Pin Nominal Voltage J101 Pins 2 and 4 5 1 V J106 Pin 1 15 V J106 Pin 2 5 1 V J106 Pin 4 5 V J106 Pin 5 15 V ...

Page 246: ... CH 1 input Attach the probe tip to the PROBE ADJUST connector on the front panel Set the trigger source to CH1 and press AUTOSET Set the Vertical SCALE to 10 mV Set your bench oscilloscope to 500 s per division 200 mV per division bandwidth limit to 20 MHz and AUTO trigger The tested channel of the A05 Attenuator board is ok Repeat this procedure for each input channel Using the A08 Jumper Board ...

Page 247: ...r Board A08 Jumper Board CH1TRIG CH2TRIG CH3TRIG CH4TRIG Pin 2 CH3SIGN CH3SIGP CH4SIGN CH4SIGP P1 Pin 1 Trigger Signals Figure 6 46 A08 Jumper and A05 Attenuator Boards Signal Locations Table 6 14 Channel and P1 Signal Locations Channel Number Trigger P1 Pin Number Vertical P1 Pin Number Vertical Inverted P1 Pin Number 1 26 27 29 2 18 19 21 3 10 11 13 4 2 3 5 ...

Page 248: ... power supply voltages ok Perform the Low Voltage Power Supply troubleshooting procedure Using Table 6 15 and Figure 6 46 are the A05 Attenuator board power supply voltages ok Power to the A04 Acquisition and A05 Attenuator boards is ok No Yes Figure 6 47 Acquisition and Attenuator Power Troubleshooting Procedure Table 6 15 A05 Attenuator Board Power J101 Pin Voltage High Low 7 5 1 V 5 15 V 4 9 V ...

Page 249: ... Service Manual 6 97 Table 6 16 A04 Acquisition Board Power J7 Voltage High Low 9 15 V 14 7 V 15 3 V 12 6 4 V 6 0 V 6 6 V 16 5 V 5 15 V 4 9 V 19 15 V 15 3 V 14 7 V J7 Pin 1 A04 Acquisition Board Figure 6 48 A04 Acquisition Board Power Connector ...

Page 250: ...oard Reconnect P2 Press the ON STBY button Does the oscilloscope power up Yes No Replace either the A06 Front Panel A01 Backplane or A07 Auxiliary Power boards Are the voltages at U1 U4 ok see Table 6 17 and Figure 6 50 Replace the A01 Backplane module Are the voltages at J7 ok see Table 6 18 and Figure 6 50 No Yes There is not a problem with the A01 Backplane Are the voltages at J8 ok see Table 6...

Page 251: ... U4 pin 3 5 V 4 8 V 5 2 V Table 6 18 J7 Voltages Pin Nominal Voltage Minimum Voltage Maximum Voltage 1 15 V 14 85 V 15 15 V 2 15 V 14 85 V 15 15 V 7 6 4 V 6 336 V 6 464 V 8 15 V 14 85 V 15 15 V 9 15 V 14 85 V 15 15 V 18 5 1 V 5 151 V 5 05 V 19 5 1 V 5 151 V 5 05 V Table 6 19 J8 Front Panel Voltages Pin Nominal Voltage Minimum Voltage Maximum Voltage 1 15 V 14 25 V 15 75 V 2 5 V 5 05 V 5 15 V 4 5 V...

Page 252: ...Troubleshooting 6 100 TDS 420A TDS 430A TDS 460A Service Manual J7 Pin 1 J8 Pin 1 J6 Pin 1 W2 Pin 1 W1 Pin 1 Figure 6 50 A01 Backplane Module ...

Page 253: ... and Feet disassembly procedure remove the cabinet Using the Console Port Set Up procedure connect the console port cable to the oscilloscope and to your personal computer Does the oscilloscope power up normally Replace J101 the Attenuator Backplane cable or the A05 Attenuator module Does the oscilloscope power up normally Power off the oscilloscope Reconnect the cable to connector J101 on the A05...

Page 254: ...console port cable to J3 on the A03 CPU module Observe your terminal as you turn on the power to the oscilloscope Note the first failure or where the tests stop Is the last displayed message Acq Number of Digitizers Perform the I2C Isolation troubleshooting procedure Are the first characters of the name of the first failed diagnostic dsp Until changing a module fixes the problem replace in order t...

Page 255: ...loscope configured for installation in a 19 inch wide instrument rack See Option XL With this option Tektronix ships a front cover and pouch RS 232 and a Centronics interface that can be used to obtain hardcopies of the oscilloscope screen a 120 000 Point Record Length and advanced DSP math the oscillo scope can compute and display three advanced math waveforms integral of a waveform differential ...

Page 256: ...rench language user manual With this option Tektronix ships a German language user manual With this option Tektronix ships a Japanese language user manual Standard Accessories Table 7 2 lists the standard accessories that are included with the digitizing oscilloscope Table 7 2 Standard Accessories Accessory Part Number User Manual 070 9701 XX Reference 020 2192 XX Performance Verification 070 9705...

Page 257: ...0 Plotter Centronics Standard HC200 Oscilloscope Cart K212 Oscilloscope Camera C9 Oscilloscope Camera Adapter 016 1154 00 Soft Sided Carrying Case 016 1158 01 Transit Case 016 1157 00 GPIB Cable 1 meter 012 0991 01 GPIB Cable 2 meter 012 0991 00 Printer Pack with Seiko DPU 411 printer and accessory pouch TDS4F5P Pouch includes mounting plate 016 1159 00 VGA Cable Required to meet all emissions spe...

Page 258: ...3S Opt 03 AM 503S Opt 05 TCP202 P6021 P6022 CT 1 CT 2 CT 4 AC DC Uses DC to 50 MHz A6302 Current Probe AC DC Uses DC to 15 MHz A6303 Current Probe AC DC Uses DC to 100 MHz A6312 Current Probe AC DC DC to 50 MHz TekProbe powered AC 120 Hz to 60 MHz AC 935 kHz to 120 MHz Designed for permanent or semi permanent in circuit installation CT 1 25 kHz to 1 GHz 50 Ω input CT 2 1 2 kHz to 200 MHz 50 Ω inpu...

Page 259: ...atement for this product is after the title page of this manual Tektronix offers the following services that you can purchase any time during the warranty period of this product H REP Repair Service Assurance provides one year of post warranty repair support It is available in one year increments up to two years H CAL Calibrate Service Assurance provides one year of calibration support It is avail...

Page 260: ...Options and Accessories 7 6 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 261: ... Parts List The modules that make up this instrument are often a combination of mechanical and electrical subparts Therefore all replaceable modules are listed in Chap ter 10 Mechanical Parts List Refer to that chapter for part numbers when using this manual ...

Page 262: ...Electrical Parts List 8 2 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 263: ...tandard Y32 2 1975 Abbreviations are based on ANSI Y1 1 1972 Logic symbology is based on ANSI IEEE Std 91 1984 in terms of positive logic Logic symbols depict the logic function performed and can differ from the manufacturer s data A tilde preceding a signal name or an asterisk following a signal name indicates that the signal performs its intended function when in the low state Other Tektronix AN...

Page 264: ...J40 P5 P4 P3 P2 J4 A08 JUMPER J7 J9 P1 P2 34 PINS 34 PINS 20 PINS J6 A25 20 LOW VOLTAGE PWR SUPPLY J2 22 PINS REM W3 W5 J1 5 PINS 3 PINS 50 1 3 2 A7W5 A7W2 A04 ACQUISITION J5 J8 50 PINS OPTION 14 PINS 2 PINS INTRG BACK PANEL NO BLOCK DIAGRAMS THESE REPLACEABLE CABLES FOR THESE BOARDS ARE LISTED IN SECTION 10 FAN LINE FILTER B15 AUXILIARY POWER A07 J3 P3 W4 2 PINS 2 10 PINS J7 J4 2 PINS AUX TRIG EX...

Page 265: ...8 PINS DTE PORT RS 232 P1 P3 98 PINS 9 PINS J60 2 PIN J1 9 7V 2A A09 DSP W2 P1 P2 J5 J1 98 PINS 20 TERMINATIONS 98 PINS 98 PINS 3 0V J1 50 PINS 2 PINS 50 TO BT12 J1 J7 8 PINS J2 8 50 15 PINS VIDEO VGA OUTPUT J4 P1 P2 98 PINS 98 PINS A10 SERPAR 25 PINS J50 25 CENTRONICS COMPATIBLE DISPLAY J7 22 PINS 22 A02 A26 MONITOR J901 10 PINS 2 A01 BACKPLANE J6 10 PINS 10 FUSED 50 PINS FLOPPY DRIVE P38 26 Figu...

Page 266: ...BACKPLANE FAN FUSE POWER SWITCH LOW VOLTAGE POWER SUPPLY A09 DSP BATTERY 50 22 10 2 2 1 2 FL52 1 PROBE ADJ GND 10 MENU SWITCHES A17 BEZEL BUTTON 14 PROBE CODING INTERFACE A15 5 A06 FRONT PANEL 10 34 34 20 2 98 50 FRONT PANEL SWITCHES FRONT PANEL POTS FRONT PANEL LEDS PROBE COMPENSATION 2 3 1 1 TDS 420A TDS 460A ONLY TDS 420A TDS 460A ONLY 2 Figure 9 3 TDS 400A Block Diagram B010100 B079999 ...

Page 267: ...Y A03 CPU DIAG PORT RS 232 PORT 10 10 25 15 8 VIDEO VGA A26 MONITOR MONITOR ASSEMBLY DISPLAY VIDEO A02 2 98 50 1 GPIB IEEE 488 PORT PROCESSOR SYSTEM 98 OPTION 13 A10 SERPAR 7V 2A FUSED RS 232 DTE PORT 2 9 25 CENTRONICS COMPATIBLE Floppy Drive 26 Figure 9 4 TDS 400A Block Diagram B010100 B079999 Cont ...

Page 268: ...0 J30 J40 P5 P4 P3 P2 J4 A08 JUMPER J7 J9 P1 P2 34 PINS 34 PINS 20 PINS J6 A25 20 LOW VOLTAGE PWR SUPPLY J2 22 PINS J2 J1 5 PINS 3 PINS 50 1 3 2 A7W5 A04 ACQUISITION J5 J8 50 PINS OPTION 14 PINS 2 PINS INTRG BACK PANEL NO BLOCK DIAGRAMS THESE REPLACEABLE CABLES FOR THESE BOARDS ARE LISTED IN SECTION 10 LINE FILTER PFC MODULE AUX TRIG EXT CLOCK 6V 34 PINS TDS 420A TDS 460A ONLY 10 PINS J7 J4 2 PINS...

Page 269: ...DTE PORT RS 232 P1 P3 98 PINS 9 PINS J60 2 PIN J1 9 7V 2A A09 DSP W2 P1 P2 J5 J1 98 PINS 20 TERMINATIONS 98 PINS 98 PINS 3 0V J1 50 PINS 2 PINS 50 TO BT12 J1 J7 8 PINS J2 8 50 15 PINS VIDEO VGA OUTPUT J4 P1 P2 98 PINS 98 PINS A10 SERPAR 25 PINS J50 25 CENTRONICS COMPATIBLE DISPLAY J7 22 PINS 22 A02 A26 MONITOR J901 10 PINS 2 A01 BACKPLANE J6 10 PINS 8 FUSED 50 PINS FLOPPY DRIVE P38 26 10 2 10 18 2...

Page 270: ...TEM A01 BACKPLANE FAN FUSE LOW VOLTAGE POWER SUPPLY A09 DSP BATTERY 50 22 10 2 2 FL52 1 PROBE ADJ GND 10 MENU SWITCHES A17 BEZEL BUTTON 14 PROBE CODING INTERFACE A15 5 A06 FRONT PANEL 10 34 34 20 2 98 50 FRONT PANEL SWITCHES FRONT PANEL POTS FRONT PANEL LEDS PROBE COMPENSATION 2 3 1 1 TDS 420A TDS 460A ONLY TDS 420A TDS 460A ONLY 2 10 2 8 Figure 9 6 TDS 400A Block Diagram B080000 up ...

Page 271: ...3 CPU DIAG PORT RS 232 PORT 10 10 25 15 8 VIDEO VGA A26 MONITOR MONITOR ASSEMBLY DISPLAY VIDEO A02 2 98 50 1 GPIB IEEE 488 PORT PROCESSOR SYSTEM 98 OPTION 13 A10 SERPAR 7V 2A FUSED RS 232 DTE PORT 2 9 25 CENTRONICS COMPATIBLE Floppy Drive 26 A01 BACKPLANE Figure 9 6 TDS 400A Block Diagram B080000 up Cont ...

Page 272: ...Diagrams 9 10 TDS 420A TDS 430A TDS 460A Service Manual ...

Page 273: ...ial number H Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part number Change information if any is located at the rear of this manual Tektronix part numbers contain two digits that show the revision level of the part For most par...

Page 274: ...umn Name Description 1 Figure Index Number Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow 2 Tektronix Part Number Use this part number when ordering replacement parts from Tektronix 3 and 4 Serial Number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the...

Page 275: ...ION 3000 COLUMBIA HOUSE BLVD SUITE 1 20 VANCOUVER WA 98661 0KB01 STAUFFER SUPPLY CO 810 SE SHERMAN PORTLAND OR 97214 4657 0KB05 NORTH STAR NAMEPLATE INC LABEL PRODUCTS 5750 NE MOORE COURT HILLSBORO OR 97124 6474 26003 MARTEK POWER MDI 4115 SPENCER STREET TORRANCE CA 90503 2489 TK1163 POLYCAST INC 14140 SW 72ND AVE SUITE 100 TIGARD OR 97224 TK2478 GRIMES COMPANY 115 S AROVISTA CIRCLE BREA CA 92631 ...

Page 276: ...OOPER INDUSTRIES INC 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR PO BOX 500 BEAVERTON OR 97077 0001 50356 TEAC AMERICA INC 7733 TELEGRAPH RD PO BOX 750 MONTEBELLO CA 90640 6537 50463 POWER SYSTEMS INC 45 GRIFIN ROAD SOUTH LINFIELD CT 06002 060D9 TENSOLITE COMPANY PRECISION HARNESS AND ASSEMBLY 3000 COLUMBIA HOUSE BLVD 120 VANCOUVER WA 98661 0KB01 STAUFFER SUPPLY CO 810 SE SHERMAN PORTLAND OR 97214 ...

Page 277: ...AST BLOW HIGH BREAKING CAPACITY UL REC SEMKO EUROPEAN 61857 80009 61857 80009 SS2 5A 159004600 EQ4A 159038100 12 211 0691 00 4 SCREW MACHINE 6 32 X 0 625 PNH STL 0KB01 ORDER BY DESC 13 200 3991 02 1 COVER REAR HARD POLYCARBONATE LEXAN 80009 200399101 14 211 0730 00 1 SCR ASSEM WSHR 6 32 X 0 375 PNH STL CD PL 0KB01 ORDER BY DESC 15 211 0840 00 1 SCREW MACHINE M2 6 X 0 45MM PITCH X 4 0 MM 0KB01 26C4...

Page 278: ... 44MB 50356 FD 04HF 2300 27 200 4219 00 1 COVER DISK DRIVE 3 5 INCH 80009 200421900 28 131 5965 00 2 CONTACT ELEC ESD PROTECTION 0 005 ST STL 80009 131596500 29 260 2539 00 1 SWITCH SET BEZEL TK1918 260253900 30 259 0086 00 1 FLEX CIRCUIT BEZEL BUTTON 07416 ORDER BY DESC 31 105 1081 00 211 0866 01 1 1 BRKT ADAPTER FLOPPY DISK DRIVE SCREW PHIL M2 5 x 10 PNH BRZN TK1163 0KB01 105108100 211 0866 01 ...

Page 279: ...TDS 420A TDS 430A TDS 460A Service Manual 10 7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Figure 10 1 External and front panel modules ...

Page 280: ... 14 211 0722 00 4 SCREW MACHINE 6 32 X 0 25 PNH STL 0KB01 ORDER BY DESC 15 671 3268 01 1 CIRCUIT BD ASSY CPU 80009 671326801 16 671 3902 00 1 CIRCUIT BD ASSY DISPLAY 80009 671390200 17 671 3588 00 671 3284 00 1 1 CIRCUIT BD ASSY DSP STANDARD CIRCUIT BD ASSY DSP OPTION 1M 80009 80009 671358800 671328400 18 386 6158 00 3 SUPPORT CKT BD MAT MATERIAL 80009 386615800 19 146 0056 02 2 BATTERY 3V 1200MAH...

Page 281: ...S 420A TDS 430A TDS 460A Service Manual 10 9 A4 A8 A5 A3 A7 A1 A2 A9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 3 3 3 3 14 14 14 3 20 21 22 23 24 25 26 27 Figure 10 2 Internal modules B010100 B079999 ...

Page 282: ...LANE PWR SPLY 80009 386615900 14 334 3003 00 1 MARKER IDENT DANGER POWER LINE TK0860 ORDER BY DESC 15 131 0955 00 1 CONN RF JACK BNC 50 OHM FEMALE STR 00779 87 3334 017 16 407 4032 00 2 BRACKET CKT BD 80009 407403200 17 671 3268 01 1 CIRCUIT BD ASSY CPU 80009 671326801 18 671 3902 00 1 CIRCUIT BD ASSY DISPLAY 80009 671390200 19 671 3588 00 671 3284 00 1 1 CIRCUIT BD ASSY DSP STANDARD CIRCUIT BD AS...

Page 283: ... 420A TDS 430A TDS 460A Service Manual 10 11 A4 A8 A5 A3 A7 A1 A2 A9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 3 3 3 3 18 19 20 21 22 23 24 25 8 8 8 26 27 28 29 8 7 Figure 10 3 Internal modules B080000 Up ...

Page 284: ... SP ELEC FLAT FLEX 11 0L TK2469 174 2283 00 6 174 2373 00 1 CA ASSY SP ELEC 2 18 AWG 2 0 L TK2469 174 2373 00 7 174 2288 00 1 CA ASSY SP ELEC DESCETE PSC 3 5L TK2469 174 2288 00 8 210 0457 00 2 NUT PL ASSEM WA 6 32 X 0 312 STL CD PL TK0435 ORDER BY DESC 9 174 2631 00 1 CABLE ASSY PWR 1460 PVC 18 AWG TK2469 174 2631 00 10 174 2281 01 1 CA ASSY SP ELEC 50 28 AWG 2 3 L FLAT CABLE TK2469 ORDER BY DESC...

Page 285: ...TDS 420A TDS 430A TDS 460A Service Manual 10 13 1 2 3 4 5 6 7 8 9 8 10 11 12 5 13 14 3 Figure 10 4 Cables and routing B010100 B079999 ...

Page 286: ...SS SENS VINYL FOAM 0 5 X 0 062 2K262 ORDER BY DESC 5 174 4557 00 1 CA ASSY SP FLAT FLEX FLX 10 26 AWG 12 0 L 1 X 10 0 1 CTR RCPT LATCHING BOTH ENDS OPPOSING S 060D9 174 4557 00 6 174 2288 00 1 CA ASSY SP ELEC DESCETE PSC 3 5L TK2469 174 2288 00 7 174 2281 01 1 CA ASSY SP ELEC 50 28 AWG 2 3 L FLAT CABLE TK2469 ORDER BY DESC 8 174 2280 00 1 CA ASSY SP ELEC FLAT FLEX 1 7L TK2469 174 2280 00 9 174 227...

Page 287: ...TDS 420A TDS 430A TDS 460A Service Manual 10 15 1 2 3 4 5 6 7 3 8 9 10 11 Figure 10 5 Cables and routing B080000 Up ...

Page 288: ...0167 00 1 CABLE ASSY PWR 3 0 X 0 75 6A 240V 2 5M L OPTION A5 SWITZERLAND S3109 ORDER BY DESC 1 CLAMP PWR CORD POLYMIDE SEE FIGURE 10 1 9 TK1163 ORDER BY DESC OPTIONAL ACCESSORIES 003 1463 00 1 WRENCH BNC WRENCH FOR BNC FIXTURE 80009 003146300 003 1464 00 1 FIXTURE BNC BNC FIXTURE FOR TDS400 80009 003146400 012 0991 00 1 CABLE COMPOSITE IDC GPIB 2 METER 24 COND 00779 553577 3 012 0991 01 1 CABLE GP...

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Summary of Contents for TDS 420A

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