HP 54501A Service Manual
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SECTION 5 . REPLACEABLE PARTS Table of Contents 5-1 . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-2 . Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-3 . Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . .
6-17 . SELFTESTS The selftests are used for isolating problems in the HP 54501 A . Akeydown power-upmust be performed before invoking the HP 54501A selftests . This ensures critical parameters to the selftests are set to known values to avoid any erroneous results . The selftests may be invoked from any menu by pressing the front-panel UTIL key and then select- ing selftest menu softkey . Figur
HP 54501A, HP 54501A PERFORMANCE TESTS 3-8 . DELTA-T ACCURACY TEST Specification : Delta-t accuracy for dual-cursor, single-channel measurement, or for channel-to-channel measurement after visual time null calibration has been done . Equipment Required : Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8656B BNC Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A Procedure : +- 2% of (t/div) +- .005% of Delta t +- 1 ns 1 . Set Signal Generato
HP 54501A, Table 6-2 . Replaceable Parts (Cont'd) HP Model 54501A Replaceable Parts See introduction to this section for ordering information 5- 3 Reference Designator HP Part Number C D Qty Description Mfr Code Mfr Part Number A1 54501-69501 9 1 PROCESSOR BOARD ASSEMBLY 28480 54501-69501 A2 54503-66502 8 1 KEYBOARDASSEMBLY 28480 54503-66502 A3 2090-0211 6 1 CRT MONITOR ASSEMBLY 28480 2090-0211 A4 0960-0753 6 1 ROTARY PULSE GENERATOR ASSEMBLY 28480 0960-0753 A5 0950-1879 8 1 POWER SUPPLY ASSEMBLY 28480 0950-IB79 R6 9135-0325 8 1 LIN
HP 54501A, SECTION 1 . GENERAL INFORMATION Table of Contents 1-1 . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 . Instruments Covered by Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-3 . Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-4 . Accessories Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP 54501 A TABLE OF CONTENTS SECTION 1 . GENERAL INFORMATION 1-1 . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 . Instruments Covered by Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-3 . Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 . INTRODUCTION This section provides adjustment and self calibration procedures for the HP 54501A . The assemblies with adjustments are : the power supply, CRT monitor, and the systemboard . Figures 4-1 and 4-2 are the testpoint and ad- justment locations for the HP 54501A . 4-2 . EQUIPMENT REQUIRED Equipment required for adjustments is listed in the Recommended Test Equipment table in section
HP 54501A, 4-6 . CRT MONITOR ASSEMBLY ADJUSTMENTS No Equipment Required NOTE All CRT Monitor Assembly adjustments are preset at factory and should not need readjustment . These adjustment procedures should be per- formed only when the display has obvious differences from CRT test dis- play in figure 4-2 . gys356aenrmxzcoftkha% any softkey exits gys355aenrmxzcof tkhnx Figure4-2 . HP 54501A CRT Test Display HP 54501A ADJUSTMENTS 1 . Place CRT test menu on HP 54501A screen for the CRT Assembly adjustments via the UTILITY menu . Use this test menu for all CRT adjustments . a . Invoke the UTILITY MENU by pressing the front-panel UTIL key
HP 54501A, HP 54501A SERVICE FROM CHART 0 DISCONNECT POWER . CHECK FUSE (POSITION, RATING . AND OPERATION .) APPLY POWER AND CHECK POWER SUPPLY VOLTAGES (TABLE 6-1) REPLACE FUSE CHART 1 a4eovrso¢ Figure 6- 5 . Trouble Isolation Chart for HP 54501A Fan/Fuse
HP 54501A, 3-6 . OFFSET ACCURACY TEST Specification : Equipment Required : Procedure : HP 86568 SIGNAL GENERATOR HP 54501A HP 8482A POWER SENSOR HP 1250-0781 HP 1250-1474 POWER BNCTEE TYPE N BNC SENSOR (M)(F)(F) ADAPTER CABLE Figure 3-1 . Bandwidth Performance Test Setup t 2% of offset + 0 .2 X (V/div) + .075 div/A° C 5 mV range, ± 2% of offset + 0 .4 X (V/div) +0 .15 div/A° C HP 54501A PERFORMANCE TESTS HP 436A POWER METER 54W/W_23 Power Supply . . . . . . . . . . . . . . . . . . . . . . . .
HP 54501A SERVICE Trigger Comparator . The trigger comparator compares the input signal from the preamplifier with the trigger level signal from the DAC . The comparator also uses the trig- ger hysteresis from the DAC for partial noise immunity to the system . The incoming signal must be large enough to satisfy the hysteresis requirement before the output of the compara- tor switc
HP 54501A, HP 54501A PERFORMANCE TESTS 5 . Repeat steps 1 through 4 for channels 2 through 4 . 6 . Adjust Power Supply for +50 mV output . 7 . Press HP 54501A front-panel CHAN key . a . Select channel 1 on . b . Select 5 mV/div . c . Set coupling to dc . d . Set offset to +50 mV . 8 . Press HP 54501A front-panel display key . a . Select avg mode . b . Set #ofavg to 2048 . 9 . Check for baseline within 0 .6 divisions of center reference . 10 . Repeat steps 7 through 9 for channel 4
HP 54501A, 4-8 . Focus Adjustment and Horizontal Phase Adjustments 1 . Adjust sweep board H . PHASE to center menu horizontally on the CRT screen . 4-9 . Vertical Linearity and Height Adjustments NOTE The V . LIN and HEIGHT adjustments are interactive and may need to be repeated as necessary . 3 . Readjust steps 1 and 2 as necessary for a uniform display of the screen menu . HP 54501A ADJUSTMENTS 2 . Adjust sweep board FOCUS control for sharp percent symbol (%) on the top and bottom blocks of text . 1 . Adjust sweep board V . LIN for equal height of corne
HP 54501A, HP 54501A SERVICE 6-26 When installing CRT, make certain that CRT yoke is properly aligned . THE GROUND BRACKET MUST BE INSTALLED BEFORE THE CRT . 11 . To install CRT Monitor Assembly, reverse this procedure . After replacement of CRT Monitor Assembly, only if necessary, perform the CRT adjustmentprocedures detailed in section 4 of this manual . 6-23 . Removal and Replacement of Fan 1 . Disconnect power cable . 2 . Remove the six screws from top and the two screws fromeach side of instrument . 3 . Lift off top cover .
HP 54501A, HP 54501A TABLE OF CONTENTS 6-20 . Removal and Replacement of Keyboard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23 6-21 . Removal and Replacement of System Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24 6-22 . Removal and Replacement CRT Monitor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25 6-23 . Removal and Replacement of Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26 6-24 . Removal
HP 54501A, HP 54501A SERVICE 6-21 . Removal and Installation of System Board Assembly The effects of ELECTROSTATIC DISCHARGE may damage electronic com- ponents . Use grounded wriststraps and mats when servicing the System Board Assembly . 1 . Disconnect power cable . 2 . Remove the six screws from top and the two screws from each side of instrument . 3 . Lift top cover off . 4 . Detach line filter cable, W7, from Power Supply Assembly . 5 . Remove do power supply cable, W1 . 6 . Remove the two PCB (printed circuit board) retainers fro
HP 54501A, 21 . AUTOSCALE and set channel 3 vertical sensitivity to 200 mV/div . 22 . Adjust System Board Assembly C102 for flat top and baseline on displayed signal . 23 . Connect Square Wave Generator to Channel 4 . 24 . AUTOSCALE and set channel 4 vertical sensitivity to 200 mV/div . 25 . Adjust System Board Assembly C5 for flat top and baseline on displayed signal . 26 . Change Square Wave Generator output for approximately 5 Vp-p output . 27 . AUTOSCALE and set channel 4 vertical sensitivity to 2 V/div . 28 . Adjust System Board Assembly C2 for flat top
HP 54501A, SECTION 6 . SERVICE Table of Contents 6-1 . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-2 . Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-3 . Logic Convention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-4 . Block Level Theory of Operation . . . . . . . . . . . . . . . . . . . . .
HP 54501A, 4-13 . DAC Reference Adjustment Equipment Required : Digital Multimeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3478A Procedure : 1 . Invoke SERVICE MENU by first pressing front-panel UTIL key and then selecting service menu . 2 . Select cal select 2 with menu softkey . 3 . Set dac output to high adjust . 4 . Connect DVM to rear panel DC Calibrator Output . HP 54501A ADJUSTMENTS 5 . Adjust System Board Assembly R723 for DVM indication of 5 .0000 V . Refer to figure 4-4 for adjustment location . 6 . Set cal select to low view . 7 . �
HP 54501A, Table 1-1 . HP 54507A Specifications and Characteristics HP 54501A GENERAL INFORMATION SPECIFICATIONS BANDWIDTH : dc-coupled Repetitive : do to 100 MHz (-3 dB) Single Shot : do to 1 MHz (Based on 10 points per period of input signal .) ac-coupled Repetitive : 10 Hz to 100 MHz (-3dB) Single Shot : 10 Hz to 1 MHz (Based on 10 points per period of input signal .) RISETIME : 3 .5 ns (Calculated from : Risetime = 0 .35/Bandwidth .) NUMBER OF CHANNELS : 4 (2+2) Channels 2 and 3 are limited attenuatoi
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