Tektronix CSA 803C - page 174

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6Ć38

%" %Remove the single Torxhead screws that secures the transĆ

former,on the A8 CRT Driver board, to the instrument chassis. This

screw is located at the rear of the transformer.The A8 CRT Driver board

is now not attached to the instrument chassis.

%" %Remove connectors J52, J56, and J57 from the A8 CRT Driver

board. Note the position of the multiĆpin connectors' index triangles to

ensure that you can correctly replace these connectors.

%" %Lift the A8 CRT Driver board partially out of the instrument

chassis.

%" %Remove connectors J54 and J55 from the A8 CRT Driver

board. Note the position of the multiĆpin connectors' index triangles to

ensure that you can correctly replace these connectors.

%" %Remove the A8 CRT Driver board and the A7 CRT Socket

board.

%" %Unsolder the two wires that connect the A8 CRT Driver board

to the A7 CRT Socket board (the two boards are now separated).

Toreplace the A8 CRT Driver board and the A7 CRT Socket board, perform

the previous steps in reverse order.

J53

J56

SolderPoints

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Contents

Main Page Page Page EC Declaration of Conformity Page Page Table of Contents Specifications Operating Information Theory of Operation Page Page )&)$% )!!+!&% Adjustment Maintenance Page Page Page Page Page Page To Avoid Fire or Personal Injury Symbols and Terms Page Specifications Page Page Page !"" $ Page Power Cord Information Operating Temperature Ventilation Requirements Memory Backup Power Operating Environment Packaging for Shipment Page ! Page System Functional Overview Executive Processor Block Memory Management Unit Block Waveform Memory Block Front Panel Controls I/O Block Waveform Compressor and Display Control Block Block Diagram Descriptions Data Buffers Address Latch Function Decoder Internal Clock Rate Generator " ! Microprocessor RAM/ROM Memory Trigger A5 Time Base/Controller Board Page Memory Management Unit (MMU) Interface A7 CRT Socket Board Red, Green, and Blue Video Amplifiers Red, Green, and Blue Adjustments Convergence Adjustment ! # " " Degauss A9, A10, and A11 Front Panel Boards A9 TouchPanel Assembly A10 Front Panel Control Board A11 Front Panel Button Board GPIB Data and Address Bus A12 Rear Panel Assembly Standard RS232C Controller Printer Port I/O Data Buffer A13 Mother Board A14 Input/Output (I/O) Board Page MMU IC Waveform RAM Display Interface A15 Memory Management Unit (MMU) Board Time Base/Controller Interface Executive Processor (EXP) Interface Display IC Microprocessor Bit Map RAM A17 Executive Processor Board ! ! ! A18 Memory Board Address Latches Address Decode and Memory Select # "' $ %"# $ $$ "$ " $ $$ #$# "' %"$ Page "" "# &"$"# #%"$ "'" !%#$ (#$ "# Timing and Sampling Head Control Shared RAM Time Base/Controller Interface Page Performance Verification Page TestEquipment Page Page Page Page Page Sweep Rate Accuracy Internal Clock Calibrator Output Page Setup to Invoke PowerOn Diagnostics Procedure to Invoke PowerOn Diagnostics PowerOn Diagnostics Diagnostics SelfTestDiagnostics ! "# " " # " " Page Setup to Invoke Extended Diagnostics Procedure to Invoke Extended Diagnostics Extended Diagnostics Page Setup to Check Vertical Reference Voltage Procedure to Check Vertical Reference Voltage Vertical Reference Voltage Page Setup to Check Horizontal Reference Clock Procedure to Check Horizontal Reference Clock Horizontal Reference Clock Performance Tests 424 Performance Verification Figure 42:A5 Time Base/Controller Board TestPoint Locations Pin 1 Pin 9 U191 Vertical Accuracy Setup to Check Vertical Gain Procedure to Check Vertical Gain Page Page &'# &" %& '$( $"'$ &" %& '$( Page Page Setup to Examine Vertical RMS Noise Procedure to Examine Vertical RMS Noise System Vertical RMS Noise Page Page '" % &#) %&" %! ( '"% &#) #!&# %! ( '"% &#) Sweep Rate Accuracy 2 ns/div ,& ) *'. $(!+ ,& ) *'. &(!+ ,& ) *'. &(!+ Sweep Rate Accuracy 1 ps/div Page Setup to Check Triggering Procedure to Check Triggering Triggering, External Direct Page Prescaler Triggering Setup to Check Prescaler Triggering Procedure to Check Prescaler Triggering Page Internal Clock Setup to Examine Internal Clock Procedure to Examine Internal Clock Page Calibrator Output Setup to Examine Calibrator Procedure to Examine Calibrator Page Page Page TestEquipment Page Page Power Supply Setup to Examine Voltage Supply Procedure to Examine Voltage Supply Page Setup to Examine/Adjust Voltage Reference Procedure to Examine/Adjust Voltage Reference Page Setup to Examine/Adjust Regulator Reference Procedure to Examine/Adjust Regulator Reference Page Setup to Examine/Adjust the Display Procedure to Examine/Adjust the Display Page Page Page Adjustments 518 Figure 54:A8 CRT Driver Board Adjustment Locations Adjustment Procedures Page Real Time Clock Setup to Examine/Adjust Real Time Clock Procedure to Examine/Adjust Real Time Clock Page Page Page & " " Page Removing and Replacing FRUs Page Page Page Page Electrical LockOn of the Front Panel ON/STANDBY Power Switch 614 Figure 61:Field Replaceable Unit (FRU) Locator (Cont.) CSA 803C Service Manual 615 Page Page Page Fan Motor Removal/ Cathode Ray Tube (CRT) Removal/ Page Page Page 624 Figure 65:Removing/Replacing the Cathode Ray Tube Page Acquisition Unit Removal/ Emergency and First Aid Information 630 A1 M/F Strobe Drive Board A3 M/F Power Connect Board A4 Regulator Board Page A5 Time Base/Controller Board A6 Calibrator Board 636 Battery (U511 RAM Socket) Figure 610:Removing/Replacing the A5 Time Base/Controller and A6 Calibrator Boards J860 J32 ! Page Page A9 TouchPanel Assembly Page Page A11 Front Panel Button Board A12 Rear Panel Assembly Page A13 Mother Board Page Page A15 Memory Management Unit (MMU) Board Page A17 Executive Processor (EXP) Board Page A18 Memory Board Page ! Page A20/A21 Head Interconnect (Power Only) and A22/A23 Head lnterconnect Boards Page Figure 625:Removing/Replacing the Front Subpanel Assembly CSA 803C Service Manual 661 A26 M/F Acquisition lnterconnect Board Page A27 Acquisition Analog Board A28 Acquisition MPU Board FRU IC Removal Serial Data Interface Integrated Circuits (SlamPack" ICs) Page 668 Firmware Integrated Circuits (Dual InLine Package" ICs) Firmware Upgrade Procedure Page Page Page Page 674 Figure 632:MultiPin Connector Orientation and Semiconductor Indexing Diagram Page Checks After FRU Page ! ! ! #! Page Page Diagnostic Menus Diagnostic Menu Hardcopy !#$ " ! && 1,-"' )!" 44 Page Battery Testing FRU Name Abbreviations *(') (&+&'! %%#% #& Page Page Page Display Subsystem Error Index Codes " ' &$''$& &&$& #* $' ! " ! " %$ ! !!" # " 699 ST1(LSB) ST2 ST3 ST4(MSB) ST5(Test Running) ST6(TestFailed) StatusLEDs %) ' ( #" &#''#& &&#& "* #' Other Troubleshooting Module Troubleshooting A4 Regulator Board Power Supply Module Module Troubleshooting CRT,A7 CRT Socket Board, or A8 CRT Driver Board A13 Mother Board Fuse Testing Page Page <ui> N <ui> Time Base Calibration Errors Page Acquisition Calibration Errors Options Instrument Options Page Page ! i $# " $# ! CSA 8,3C Service Manual 2 Figure 93:A4 Regulator Board Block Diagram Figure 94:A5 Time Base'Controller Board Block Diagram Figure 95:A7 CRT Socket Board Block Diagram CSA 803C Service Manual 3 Figure 96:A8 CRT Driver Board Block Diagram Figure 97:A12 Rear Panel Assembly Block Diagram CSA 8,3C Service Manual 4 Figure 98:A.4 I'O Board Block Diagram Figure 9.,:A.7 Executive Processor Board Block Diagram Figure 99:A.5 MMU Board Block Diagram #' & 5 &# *) !#( !# ! # &# *) %#! &# !# ! # &# *) "&$%! %#! % !# ! # CSA 803C Service Manual 6 Figure 914:A27 Acquisition Analog Board Block Diagram Figure 915:A28 Acquisition MPU Board Block Diagram Page Page Page Page Page Page ! " ! $ ! ! ! Item Names Using the Replaceable Parts List Page " #%$ 104 #%$$% CSA 803C Service Manual 105 CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER &"" ')( 106 $ " ')( () #" ! 107 &"" ')( 108 $ " ')( () A9 CSA 803C Service Manual 109 A11 Figure 102:Front Panel 1010 A10 CSA 803C Service Manual 1011 A12 Figure 103:Chassis, Rear A7 1012 Page '## (*) 1014 %!# (*)!)* CSA 803C Service Manual 1015 1016 A28 A27 Figure 105:Acquisition Module A19 A20 A21 A22 A23 A26 ($$ )+* )-" &,$ 1017 1018 A2 Figure 106:Power Supply CSA 803C Service Manual 1019