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149

Theory of Operation

This

Service Guide

supports troubleshooting the Agilent Technologies oscilloscopes to

assembly level. Theory of operation is included only as supplemental information. It is
not comprehensive enough for component-level troubleshooting.

Block-Level Theory

The front panel provides:

• Dedicated knobs and pushbuttons for major oscilloscope functions.

• An 8.4-inch (diagonal) color flat panel display for waveform, measurement, and graphical

interface display.

• A front panel USB 2.0 port.

• Precision BNC connectors for channel input signals.

• BNC connector for auxiliary output signal.

• AutoProbe interface for probe power and probe control.

• A connection for probe compensation.

The rear panel provides several connections:

• The line power input.

• An GPIB connector, for connection to an oscilloscope controller.

• An RS-232 connection.

• A parallel printer connection.

• XGA monitor connection.

• Mouse and keyboard connections.

• LAN 10/100 connection.

• Auxiliary Trigger Input BNC.

• 10 MHz Reference Output BNC.

• 10 MHz Reference Input BNC.

• TTL trigger output BNC.

• Rear panel USB 2.0 ports.

The oscilloscope consists of several assemblies. Refer to the oscilloscope block diagram on the
previous page for the following discussion.

Summary of Contents for DSO80204B

Page 1: ...c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p...

Page 3: ...eeds from 5 ps div to 20 s div Delayed sweep speeds from 1 ps div to main time base setting Intensified waveforms on main sweep window make it easy to see what will appear in delayed sweep window Acqu...

Page 4: ...ont Panel Power Acquisition and General Controls Horizontal Controls Marker and Quick Measurement Controls Vertical Controls Vertical Inputs Trigger Setup AutoProbe Interface Touchscreen Display USB 2...

Page 5: ...om this diagram LAN Port GPIB Interface Mouse and Keyboard Ports Video Output CD ROM Drive USB Ports Line In Line Out Microphone TTL Trig Out AC Power Input Aux Trig In Parallel Printer Port RS232 COM...

Page 6: ...ut testing the oscilloscope to verify that it performs according to specifications Chapter 3 Calibration explains how and when you should run the user calibration procedure Chapter 5 Troubleshooting p...

Page 7: ...6...

Page 8: ...viewing 27 To turn on the oscilloscope 28 Screen Saver 29 To turn off the oscilloscope 29 To verify basic oscilloscope operation 30 Installing application programs on Infiniium 31 Changing Windows Sys...

Page 9: ...r board 111 To remove and replace the front panel assembly 112 To remove and replace the keyboard touch screen and flat panel display assemblies 115 To remove and replace the acquisition board assembl...

Page 10: ...determine whether the oscilloscope is under warranty 12 Accessories supplied 13 Options and Accessories Available 13 Specifications characteristics 13 Environmental Conditions 14 Measurement Category...

Page 11: ...eral information about the oscilloscope The following topics are covered in this chapter Instruments covered by this guide How to determine whether the instrument is under warranty Accessories Where t...

Page 12: ...ffixed to the rear panel of the oscilloscope The serial number is composed of two parts The first part contains two letters and two numbers that signify the oscilloscope s county of origin and year da...

Page 13: ...Status web page on www agilent com 1 Direct your web browser to www agilent com 2 Select the Products Services heading 3 Select Test Measurement Equipment 4 Select Repair Calibration Applications Ser...

Page 14: ...pter 6 Replaceable Parts for available power cords User s Quick Start Guide Options and Accessories Available For a complete list of available options and accessories see Agilent Technologies publicat...

Page 15: ...surements performed on circuits not directly connected to MAINS Examples are measurements on circuits not derived from MAINS and specially protected internal MAINS derived circuits In the latter case...

Page 16: ...Chapter 1 General Information Oscilloscope Dimensions 15 Oscilloscope Dimensions The following pictures shows the dimensions of the frame...

Page 17: ...Chapter 1 General Information Oscilloscope Dimensions 16...

Page 18: ...nal InfiniiMax oscilloscope probes 25 To tilt the oscilloscope upward for easier viewing 27 To turn on the oscilloscope 28 Screen Saver 29 To turn off the oscilloscope 29 To verify basic oscilloscope...

Page 19: ...mance Verification Kit Agilent E2655B Power Cord see chapter 6 Replaceable Parts for available power cords User s Quick Start Guide The Programmer s Guide and this Service Guide are included on the os...

Page 20: ...ure 2 1 Package Contents for the Infiniium Oscilloscope Infiniium Oscilloscope with Accessory Pouch User s Quick Start Guide Mouse Keyboard Calibration Cable SMA to Precision BNC adapters 2 ProbeDeske...

Page 21: ...the oscilloscope so that it is not difficult to unplug the power cord Figure 2 2 Positioning the Infiniium Oscilloscope with Sufficient Clearance 3 Connect the power cord to the rear of the oscillosco...

Page 22: ...scilloscope power supply automatically adjusts for line input voltages in the range 100 to 240 VAC Therefore you do not need to adjust an input line voltage setting The line cord provided is matched b...

Page 23: ...India unpolarized in many nations 125V 8120 1378 8120 1521 8120 1992 Straight NEMA5 15P 90 Straight Medical UL544 90 228 90 228 96 244 Jade Gray Jade Gray Black United States Canada Mexico Philippines...

Page 24: ...the oscilloscope Figure 2 5 Rear Panel Note Your instrument s rear panel configuration may differ from this diagram Connect the cables based on your instrument s configuration While you can operate m...

Page 25: ...mm to BNC compatible adapters 1 Attach the two precision 3 5 mm to BNC compatible adapters to the ends of an SMA cable 2 Push the precision 3 5 mm to BNC compatible adapters onto the oscilloscope BNC...

Page 26: ...Max oscilloscope probes 1 Attach the probe connector to the desired oscilloscope channel or trigger input Push it straight on until it latches into place Figure 2 7 Attaching the Probe Connector 2 Con...

Page 27: ...the oscilloscope without twisting it Figure 2 9 Disconnecting the Oscilloscope Probe CAUTION Do not attempt to twist the snap on probes on or off the oscilloscope s BNC connector Twisting the probe c...

Page 28: ...upward for easier viewing 27 To tilt the oscilloscope upward for easier viewing 1 Lift up the front of the oscilloscope grasp the wire bail near the center and pull it down and forward until it latch...

Page 29: ...oscilloscope is turned on 2 Depress the power switch in the lower left corner of the oscilloscope front panel Figure 2 11 Turning on the Oscilloscope After a short initialization period the oscillosc...

Page 30: ...Wait time a Minimize the oscilloscope application b Right click on the Windows desktop c Select Properties d Select the Screen Saver tab e Type the desired delay in the Wait field f Select OK Do not d...

Page 31: ...display will pause momentarily while the oscilloscope is configured to its default settings 4 Press the Autoscale key on the front panel The display will pause momentarily while the oscilloscope adju...

Page 32: ...preferences However there are some system settings that you should avoid changing because it will interfere with the proper operation of the oscilloscope Do not change the Power Options Do not change...

Page 33: ...32 To clean the oscilloscope Clean the oscilloscope with a soft cloth dampened with a mild soap and water solution CAUTION Do not use too much liquid in cleaning the oscilloscope Water can enter the...

Page 34: ...3 To run the self calibration 35 Calibration...

Page 35: ...34 Calibration This chapter provides self calibration procedures for the oscilloscope...

Page 36: ...menu and Select Calibration 3 Click the check box to clear the Cal Memory Protect condition You cannot run self calibration if this box is checked See Figure 3 1 Let the Oscilloscope Warm Up Before A...

Page 37: ...cale calibration factors will be used The 10 MHz reference signal will not be required The remaining calibration procedure will continue b Disconnect everything from all inputs and Aux Out c Connect t...

Page 38: ...val 38 Performing Self Test and Calibration 39 Vertical Performance Verification 40 Offset Accuracy Test 41 DC Gain Accuracy Test 48 Analog Bandwidth Maximum Frequency Check 54 Performance Test Record...

Page 39: ...performance verification This may be useful if you are attempting to troubleshoot a suspected problem Test Equipment Lists of equipment needed to conduct each test are provided for each test procedure...

Page 40: ...n the Utilities menu and select Self Test b Select Scope Self Test from the Self Test list c Click on Start Self Test to start the self test procedure If any of the self tests fail ensure that the fai...

Page 41: ...40 Vertical Performance Verification This section contains the following vertical performance verification Offset Accuracy Test DC Gain Accuracy Test Analog Bandwidth Test...

Page 42: ...Let the oscilloscope warm up before testing The oscilloscope under test must be warmed up with the oscilloscope application running for at least 30 minutes prior to the start of any performance test...

Page 43: ...w is displayed enable averaging and set the of averages to 256 as shown below 3 Configure the scope to measure Average voltage on channel 1 as follows a Change the vertical sensitivity of channel 1 to...

Page 44: ...e Test Record 5 Change the vertical sensitivity of channel 1 to 10 mV div press the Clear Display key wait for the Avgs value top left corner of screen to return to 256 and then record the scope V avg...

Page 45: ...56 b Change the vertical sensitivity of channel 2 to 5 mV div c Click the V avg measurement icon on the left side of the screen d When the Enter Measurement Info window is displayed ensure that the Va...

Page 46: ...dow is displayed ensure that the V avg function is set up as follows and then click OK Source Channel 1 Measurement area Entire Display Notes Where it is used it is important to connect the BNC Tee ad...

Page 47: ...og box c Enter 400 0 mV in the Enter Offset dialog box 16 Set the Aux Out voltage VAux Out to 400 0 mV as follows a Pull down the Utilities menu and select Calibration b Change the Aux Output function...

Page 48: ...in the Offset Gain Test section of the Performance Test Record 24 Calculate the offset gain error using the following expressions and record the value in the Offset Gain Test section of the Performanc...

Page 49: ...of full scale at full resolution channel scale Full scale is defined as 8 vertical divisions Magnification is used below 5 mV div Below 5 mV full scale is defined as 40 mV The major scale settings are...

Page 50: ...to minimize ground potential differences and to ensure that the DMM measures the input voltage to the scope channel as accurately as possible Differences in ground potential can be a significant sourc...

Page 51: ...ollows a Pull down the Utilities menu and select Calibration b Change the Aux Output function to DC top left corner c Set the Level to 15 mV d Click on Close 4 Set the channel 1 vertical sensitivity v...

Page 52: ...for the Avgs value top left corner of screen to return to 256 and then record the scope s mean V avg reading in the DC Gain Test section of the Performance Test Record Notes For all scope readings in...

Page 53: ...tilities menu and select Acquisition When the Acquisition Setup window is displayed enable averaging and set the of averages to 256 b Change the vertical sensitivity of channel 2 to 5 mV div c Click t...

Page 54: ...n and record this value in the DC Gain Test section of the Performance Test Record For vertical sensitivities of less than 1 volt use the following equation For vertical sensitivity 1 V use the follow...

Page 55: ...B 6 0 GHz DSO80404B 4 0 GHz DSO80304B 3 0 GHz DSO80204B 2 0 GHz Description Critical Specifications Recommended Model Part Numbers Microwave CW Generator Maximum Frequency 14 GHz Power range 20 dBm to...

Page 56: ...nsure Channel 1 is displayed and all other channels are turned off b Set the vertical sensitivity of channel 1 to 5 mV div Notes Connect output 1 of the 11667B splitter to the scope Channel n input di...

Page 57: ...cles of a 50 MHz waveform d Pull down the Setup menu select Acquisition and then set up the acquisition parameters as follows Memory Depth Automatic Sampling rate Maximum 40 GSa s Sin x x Interpolatio...

Page 58: ...mended amplitude then set the generator to the highest value that does not produce a vertically clipped signal on the scope Table 3 1 Nominal Generator Amplitude Settings 8 Measure the input power to...

Page 59: ...0 Calculate the reference gain as follows Record this value in the Calculated Gain 50 MHz column in the Analog Bandwidth Maximum Frequency Check section of the Performance Test Record Notes For all sc...

Page 60: ...mum Frequency Check section of the Performance Test Record Vout Max Freq 15 Calculate the gain at the maximum frequency using the expression For example if Vout Max Frequency 13 825 mV Vin Max Frequen...

Page 61: ...Right click on the V rms measurement at the bottom of the screen When the RMS voltage measurement setup window is displayed change the source from Channel 1 to Channel 2 22 Repeat steps 7 to 20 to com...

Page 62: ...ero Error Test Vertical Sensitivity Test Limits Channel 1 Channel 2 Channel 3 Channel 4 5 mV div 1 4 mV to 1 4 mV 10 mV div 1 8 mV to 1 8 mV 20 mV div 2 6 mV to 2 6 mV 50 mV div 5 0 mV to 5 0 mV 100 m...

Page 63: ...div 2 4 V 2 500 mV div 2 4 V 2 1 V div 2 4 V 2 Channel 2 5 mV div 400 mV 2 10 mV div 400 mV 2 20 mV div 400 mV 2 50 mV div 900 mV 2 100 mV div 1 6 V 2 200 mV div 2 4 V 2 500 mV div 2 4 V 2 1 V div 2 4...

Page 64: ...500 mV div 1 5 V 2 1 V div 2 4 V 2 Channel 2 5 mV div 15 mV 2 10 mV div 30 mV 2 20 mV div 60 mV 2 50 mV div 150 mV 2 100 mV div 300 mV 2 200 mV div 600 mV 2 500 mV div 1 5 V 2 1 V div 2 4 V 2 Channel...

Page 65: ...surement Vin 50 MHz Vout 50 MHz Calculated Gain 50 MHz Test Limit greater than 3 dB Vin Max Freq Vout Max Freq Calculated Gain Max Freq Test Limit greater than 3 dB Channel 1 5 mV div 10 mV div 20 mV...

Page 66: ...9 Display Trouble Isolation 83 To check the backlight inverter voltages 84 To check the display board video signals 85 Front Panel Display Trouble Isolation 86 Front Panel Trouble Isolation 88 Motherb...

Page 67: ...ools Required You will need basic electronic troubleshooting tools including a digital multimeter and a 100 MHz or faster oscilloscope If you need to remove and replace assemblies see chapter 6 Replac...

Page 68: ...ement Use the default setup when a procedure requires it Press the Default Setup key to set the oscilloscope to the default state To install the fan safety shield 1 Disconnect the oscilloscope power c...

Page 69: ...contains the entire troubleshooting path from a failed oscilloscope to a working one It will direct you through the possible failure symptoms in an orderly manner Reference letters on the flow chart...

Page 70: ...Isolation Turn power on Check display On screen display problems Go to Display Trouble Isolation No A Check processor temperature B Is temperature OK Yes Check for fan fail message Does fan fail No R...

Page 71: ...esponse Do knob and key test OK System works do performance tests End Go to Front Panel Trouble Isolation Does LED test OK Check calibration Does self calibration test pass Go to Acquisition Trouble I...

Page 72: ...n the screen The exact appearance may vary depending on the setup selected before the oscilloscope was turned off 2 Press the Default Setup key This returns the oscilloscope to a known state 3 Check t...

Page 73: ...cilloscope application loads it will check that the fans are running If a fan is not running a fan failure message will appear If more than one fan has failed the oscilloscope will shut down D Run osc...

Page 74: ...hen turn the knob in the other direction the knob symbol should change from yellow to green 5 When you are finished click Close If any of the knobs orkeys do not work go to To check the keyboard Troub...

Page 75: ...highlight each LED symbol in the test screen Verify that the corresponding LEDs on the front panel are the only ones illuminated Test by Rows You can use the Marker B arrow keys to test LEDs by row h...

Page 76: ...If both tests pass go to step F F Self Calibration 1 Complete a self Calibration by following the procedures in chapter 3 Testing Performance 2 If the calibration test fails replace the acquisition a...

Page 77: ...this section is performed with power supplied to the oscilloscope and with the protective covers removed Only trained service personnel who are aware of the hazards involved should perform the mainte...

Page 78: ...e cable from the power distribution board plug in the ac power cord to the power supply and turn on the scope Does power supply fan turn Check ac power cables to power supply No Are cables OK No Repla...

Page 79: ...ly to determine the source of the fault 1 Check the power supply voltages from the power supply See Figure 5 6 forthe location of these test points Table 5 7 on page 78 shows the allowable range of po...

Page 80: ...e power board Attach jumpers Connect ac power Turn on oscilloscope Verify voltages on power board Are voltages within spec Replace power board No Go to Primary Trouble Isolation Power board OK Yes Are...

Page 81: ...Chapter 5 Troubleshooting Power Board Trouble Isolation 80 Figure 5 8 Jumpers for voltage feedback on power board...

Page 82: ...ing Power Board Trouble Isolation 81 Figure 5 9 Power Board Voltage Test Points TN401 TN501 TN206 TN205 TN201 TN502 TN202 TN503 TN500 TN200 TN203 J200 Pin 4 Pin 3 TN300 TN303 TN302 TN304 TN305 TN306 T...

Page 83: ...V 0 02 V TN502 Ground 2 0 V 0 05 V TN503 Ground 3 3 V 0 05 V TN206 Ground 3 3 V 0 05 V 0 02 V TN202 Ground 5 2 V 0 1 V 0 02 V TN500 Ground 2 5 V 0 01 V TN200 Ground 12 5 V 0 1 V TN203 Ground 6 0 V 0 1...

Page 84: ...nect external monitor cycle power and check power up sequence Power up displayed on ext monitor Replace Display Board Go to Primary Trouble Isolation Go to Power Supply Trouble Isolation Go to To chec...

Page 85: ...n the two wires when the backlight is illuminated The voltage is approximately 1 kV before the backlight tube is illuminated A red LED on the backlight inverter board illuminates when the output volta...

Page 86: ...are not present suspect the display card If the signals are present and the backlights are on suspect the flat panel display as the problem Note that CLK A0 A1 A2 and A3 are Low Voltage Differential...

Page 87: ...and LCD No Does front panel display work Try a golden display card to verify failure Does display work with golden card Replace LCD Replace display card Replace motherboard Check inverter board contr...

Page 88: ...he presence of high voltage WARNING INJURY CAN RESULT Once the cover is removed the fan blades are exposed both inside and outside the chassis Disconnect the power cable before working around the fan...

Page 89: ...Troubleshooting Front Panel Trouble Isolation 88 Front Panel Trouble Isolation Front Panel Trouble Isolation Follow the keyboard troubleshooting guide for just the power button Go to Primary Trouble...

Page 90: ...fication requires the use of either a 300 Watt or greater ATX PC power supply or a test fixture that can be built as follows Using an AMP connector Tyco Electronics part number 2 103168 3 or Agilent p...

Page 91: ...e of power harness No Disconnect AC power Plug motherboard connector of power harness into motherboard Plug motherboard connector of ATX supply into motherboard power connector Yes Plug AC power into...

Page 92: ...Chapter 5 Troubleshooting Motherboard Verification 91 Figure 5 14 Sense cable...

Page 93: ...and disconnect hard drive CD drive and floppy drive from the motherboard Use tweezers and motherboard switch cable to try and get the motherboard to boot Start adding components back in one at a time...

Page 94: ...Chapter 5 Troubleshooting Motherboard Verification 93 Figure 5 15 Intel D915GUX Motherboard To Reset short pins 5 and 7...

Page 95: ...r cable to the Infiniium oscilloscope 2 Connect the external keyboard to the rear panel 3 Press the delete key when you see the following prompt on the bottom of the screen Press TAB to Show POST scre...

Page 96: ...es acquisition memory test group pass Yes Does acquisition interface test group pass Does misc scope test group pass Yes Yes Replace acquisition board Replace the interface board A10 If that does not...

Page 97: ...toProbe Board Trouble Isolation AutoProbe Board Trouble Isolation Inspect the cable between the AutoProbe assembly and the power board Cable OK Replace bad cable No Yes Turn unit on Does unit turn ON...

Page 98: ...board assemblies CAUTION CONTAMINATION CAN CAUSE INTERMITTENT OPERATION Be careful not to contaminate the key side of the PC board or the keypads Dust and fingerprints on these parts may cause intermi...

Page 99: ...A21 acquisition cable W3 or acquisition board A1 Try troubleshooting the acquisition system first to verify correct behavior before replacing any assemblies If the voltages are correct but the LEDs d...

Page 100: ...he current version number for the scope software and on line information system software This information may be useful when contacting Agilent Technologies for further service information See figure...

Page 101: ...ard Use the table and figure to the right to check the power output at the connectors The 12 V and 12 V supplies come from ripple regulator on the power board and the 3 V and 3 V supplies are develope...

Page 102: ...12 To remove and replace the keyboard touch screen and flat panel display assemblies 115 To remove and replace the acquisition board assembly 118 To set the calibration factors after replacing the acq...

Page 103: ...e procedures Torx drivers T6 T8 T10 T15 T20 Socket wrench 5 8 inch and 9 16 inch Medium size 3 16 in flat blade screwdriver Nut Drivers 3 16 in 9 32 in 5 16 in 5 8 in Torque driver 0 34 Nm 3 in lbs 5...

Page 104: ...lloscope model numbers Oscilloscope serial numbers Description of the service required or failure indications 2 Remove all accessories from the oscilloscope Accessories include all cables Do not inclu...

Page 105: ...4 Remove the two Torx T20 screws securing the side handle 5 Remove the four Torx T20 screws that secure the rear feet two in each foot 6 Remove the four Torx T20 screws that secure the top sleeve to t...

Page 106: ...leeve off of the frame 12 To replace the covers reverse the above procedure Be sure to keep ribbon cables out of the way when replacing the covers particularly the flex cable and connector for the Aut...

Page 107: ...orce the retainer it should remain attached to the body of the socket 2 Gently pull the flex cable out of the connector Figure 6 3 Disconnecting a mylar ribbon cable To reconnect the cable 1 Ensure th...

Page 108: ...bottom covers 2 Remove the AutoProbe assembly by doing the following a Place the unit so the bottom is facing up b Locate the access hole on the inside of the front panel assembly which is below and a...

Page 109: ...ly 108 d Disconnect the mylar flex cable from the AutoProbe board See See To disconnect and connect Mylar flex cables on page 106 Figure 6 6 Pushing out the AutoProbe faceplate 3 To replace the AutoPr...

Page 110: ...look different 1 Disconnect the power cable and remove the top cover 2 Disconnect the AutoProbe interface cable The connector must be unlocked before you can remove the flex cable See To disconnect a...

Page 111: ...rocedure When inserting the assembly be sure the two tabs on the circuit board engage the two slots in the sheet metal Also be sure to carefully lock in the connector for the mylar flex cable when rea...

Page 112: ...om 300 1 kVACrms DO NOT handle this assembly while it is in operation 1 Disconnect the power cable and remove the top and bottom covers 2 Disconnect the two backlight cables from the top of the backli...

Page 113: ...scilloscope at the time of this printing Your unit may look different 1 Disconnect the power cable and remove the top and bottom covers 2 Remove the Auto Probe assembly See To remove and replace the A...

Page 114: ...e and keyboard ribbon cable 7 Use a sharp instrument to remove the silicone holding the pin headers of the touch screen and front panel USB cables to their connectors on the motherboard See Figure 6 1...

Page 115: ...oard ribbon cable and display driver cable out through the slot in the front of the chassis and not to damage the backlight inverter board 12 To replace the front panel assembly reverse the above proc...

Page 116: ...ront panel assembly from the chassis see page 112 3 Remove the ten Torx T10 screws that secure the front panel cover plate to the front casting Figure 6 15 Front panel cover plate screws 4 Carefully f...

Page 117: ...6 16 Removing the keyboard 6 To remove the touch screen assembly from the front panel cover plate remove the six T8 Torx fasteners 7 To remove the flat panel display assembly remove the backlight inv...

Page 118: ...GLASS BREAKAGE Use care when handling the touch screen and the flat panel display to prevent glass breakage Inspect the inside surfaces of the touch screen and the flat panel display closely for dust...

Page 119: ...ts that secure the BNC connectors to the front panel See To remove and replace the front panel assembly on page 112 4 Disconnect the following cables from the acquisition board Line Trig Input Cable A...

Page 120: ...19 Figure 6 19 Removing cables and screws Torx T10 2 Power Distribution Board 10 MHz Ref Output SMB Cable Acquisition Cable Acquisition Board Line Trig Input Cable Torx T10 4 Ext Trig Output SMB Cable...

Page 121: ...ft the board back from the front panel until the BNC connectors clear the front panel then lift the board away from the chassis Figure 6 20 Separate acquisition board from power distribution board 9 T...

Page 122: ...up period calibrate the oscilloscope a Connect the RS 232 cable to the Digital Multimeter RS 232 port and to the RS 232 port on the oscilloscope b Set Digital Multimeter as follows Interface RS 232 Ba...

Page 123: ...he acquisition board 122 Parity None 8 bits Language SCPI c Pull down the Utilities menu and select Calibration d Uncheck to Cal Memory Protect box to allow calibration e Click on Start to start the c...

Page 124: ...move the Acquisition board assembly 3 Disconnect the following cables from the power regulator distribution board Three power supply cables from the top side of the chassis Fan harness cables on the b...

Page 125: ...he power cable and remove the top cover 2 Remove the keyboard cable power supply cable motherboard cable and acquisition board cable from the PCI bridge board 3 Remove the Torx T10 screw that secures...

Page 126: ...e cables from the display board Backlight primary cable Flat panel display driver multi colored cable 3 Remove the Torx T10 screw that secures the display board to the chassis Figure 6 23 Removing the...

Page 127: ...remove the top sleeve 2 Remove the CD ROM and hard drive cables from the cable clamps Figure 6 24 Removing cables from cable clamps 3 Remove the two Torx T20 screws holding the shock mount in place s...

Page 128: ...the hard disk drive reverse the above procedure Be sure to reconnect the hard drive ground cable to the upper right shock mount screw CAUTION DO NOT OVER TIGHTEN THE SCREWS Do not overtighten the Torx...

Page 129: ...strument and remove the top sleeve 2 Remove the following cables SATA Cable CD ROM Power cable 3 Using a Torx T10 driver remove the three CD ROM support bracket screws holding the CD ROM drive in plac...

Page 130: ...e three Torx T6 screws to 1 5 in lb 7 Using a Torx T10 driver remove the two screws securing the CD ROM adapter board to the support bracket When re assembling torque the two Torx T6 screws to 1 5 in...

Page 131: ...er cable and remove the top cover 2 Remove the CD ROM drive see page 128 3 Remove all cables from the PCI cards 4 Remove all PCI cards from the motherboard 5 Disconnect all cables from the motherboard...

Page 132: ...ive of the oscilloscope at the time of this printing Your unit may look different WARNING SHOCK HAZARD If the power supply is defective it could have a dangerous charge on some capacitors This charge...

Page 133: ...re the bracket to the frame These screws are part of the power supply bracket and can not be remove from the bracket 7 Remove the power supply and power supply bracket from the chassis 8 Remove the tw...

Page 134: ...ns When necessary refer to other removal procedures The graphics in this chapter are representative of the oscilloscope at the time of this printing Your unit may look different 1 Disconnect the power...

Page 135: ...LLOSCOPE When replacing the fan be sure the direction of the fan air flow is coming from the inside to the outside of the oscilloscope Check the flow arrows on the fan and check for proper flow once p...

Page 136: ...placeable Parts 136 Listed Parts 136 Unlisted Parts 136 Direct Mail Order System 136 Exchange Assemblies 136 Power Cables and Plug Configurations 137 Exploded Views 139 Replaceable Parts List 143 Repl...

Page 137: ...gilent Technologies Sales Office when the orders require billing and invoicing Prepaid transportation There is a small handling charge for each order No invoices In order for Agilent Technologies to p...

Page 138: ...olor Country Opt 900 250V 8120 1703 90 90 228 Mint Gray United Kingdom Cyprus Nigeria Zimbabwe Singapore Opt 901 250V 8120 0696 90 87 221 Mint Gray Australia New Zealand Opt 902 250V 8120 1692 90 79 2...

Page 139: ...t 927 8120 8871 90 Thailand Partnumber shown for plug is industry identifier for plug only Number shown for cable is AgilentTechnologies partnumber for complete cable including plug These cords are in...

Page 140: ...Chapter 7 Replaceable Parts Exploded Views 139 Exploded Views Front Frame and Front Panel...

Page 141: ...Chapter 7 Replaceable Parts Exploded Views 140 Fan and Acquisition Assembly...

Page 142: ...Chapter 7 Replaceable Parts Exploded Views 141 Power Supply and PC Motherboard...

Page 143: ...Chapter 7 Replaceable Parts Exploded Views 142 Sleeve and Accessory Pouch...

Page 144: ...DSO80204B A1 Repair Center Replacement Only 1 4 CH ACQUISITION ASSEMBLY Agilent Model DSO80304B A1 Repair Center Replacement Only 1 4 CH ACQUISITION ASSEMBLY Agilent Model DSO80404B A1 Repair Center R...

Page 145: ...N ID H21 0515 0436 4 SCREW MACH M4 0 X0 70 18MM LG T20 WASHER NOTON OPTION 017 H22 0515 0374 4 SCREW MACH M3 0 X 0 50 10 MM LONG T10 WASHER H24 0515 1940 4 SCREW MACH M2 5 X 0 45 6 MM LONG T8 LOCK H25...

Page 146: ...57 60201 1 ATX PANEL COVER MP45 54810 42204 1 GROMMET 9x64 MP47 54810 42202 1 GROMMET 20x50 MP48 54855 61101 4 HEAT SINK MP49 54857 60201 1 REMOVEABLE HARD DRIVE COVER PLATE NOT ON OPTION 017 MP50 548...

Page 147: ...Option 921 CHILE W18 8120 8377 1 CABLE POWER Option 922 W18 8120 8871 1 CABLE POWER Option 927 THAILAND W18 8120 1521 1 CABLE POWER standard 125V USA W19 54855 61606 1 FAN CABLE W20 54801 61626 1 KEY...

Page 148: ...y Assembly 150 FPD Monitor Assembly 150 Acquisition System 150 Front Panel 150 Disk Drive 150 Motherboard 151 Probe Power and Control 151 Acquisition Theory 153 Acquisition Board 153 Interface and GPI...

Page 149: ...Chapter 8 Theory of Operation 148 Figure 8 1 Oscilloscope Block Diagram...

Page 150: ...sion BNC connectors for channel input signals BNC connector for auxiliary output signal AutoProbe interface for probe power and probe control A connection for probe compensation The rear panel provide...

Page 151: ...lock theory Front Panel The front panel is read and controlled by a micro controller IC This device contains a microprocessor RAM ROM and a DUART for communication with the microprocessor on the main...

Page 152: ...t drive the FPD monitor The display board also provides 12 V to the backlight inverter Probe Power and Control The Probe Power and Control board provides filtered regulated power to the front panel Au...

Page 153: ...ircuitry Data Delay Circuit Clock Delay Circuit Mixed Signal Trigger Scope Back Panel 10 MHz In Scope Front Panel Probe Comp CH 1 CH 2 CH 3 CH 4 CH 1 CH 2 CH 3 CH 4 ATrig Hold Off Data Clock Data Dece...

Page 154: ...g digitizing and high speed waveform storage Each ADC contains one 20 GSa s ADC Trigger There are four main trigger circuits Trigger Conditioning Analog Comparators a Trigger Multiplexer and Mixed Sig...

Page 155: ...ircuitry converts this time difference into a voltage and digitizes it with an analog to digital converter ADC Using this value the CPU precisely positions the acquired samples relative to the trigger...

Page 156: ...control lines 7 system grounds and 1 chassis ground Acquisition Board Interface The interface to the acquisition board consists of 16 data lines 10 address lines a R W line and read and write strobes...

Page 157: ...156...

Page 158: ...front 27 front panel connections 26 G GPIB connecting 23 I inspecting the oscilloscope 18 installing application software 31 instrument controller 23 inverter backlight 84 L LAN card 23 line voltage...

Page 159: ...158 Index...

Page 160: ...y that the ground protection is impaired you must make the instrument inoperative and secure it against any unintended operation Service instructions are for trained service personnel To avoid dangero...

Page 161: ...contained in this document is provided as is and is subject to being changed without notice in future editions Further to the maximum extent permitted by applica ble law Agilent disclaims all warranti...

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