Keithley 2750, Service Manual

Page: 12 / 179

4 Troubleshooting
Table 4-1 Power supply components ...................................................... 4-5
Table 4-2 Display board checks ........................................................... 4-14
Table 4-3 Power supply checks ............................................................ 4-14
Table 4-4 Digital circuitry checks ........................................................ 4-15
Table 4-5 DCV signal switching .......................................................... 4-16
Table 4-6 ACV and FREQ signal switching ........................................ 4-17
Table 4-7
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2 signal switching .............................................................. 4-18
Table 4-8
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4 signal switching .............................................................. 4-19
Table 4-9
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4 dry circuit signal switching ............................................ 4-20
Table 4-10
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2/
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4 reference signal switching ........................................ 4-20
Table 4-13 ACA signal switching .......................................................... 4-21
Table 4-11
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4 dry circuit reference signal switching ............................ 4-21
Table 4-12 DCA signal switching .......................................................... 4-21
Table 4-14 DCV signal multiplexing and gain ....................................... 4-22
Table 4-15 ACV and ACA signal multiplexing and gain ...................... 4-22
Table 4-16 DCA signal multiplexing and gain ....................................... 4-22
Table 4-17
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2 signal multiplexing and gain .......................................... 4-23
Table 4-18
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4 signal multiplexing and gain .......................................... 4-23
Table 4-19
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4 dry circuit signal multiplexing and gain ........................ 4-23
Table 4-20 Switching device locations ................................................... 4-24
5 Disassembly
Table 5-1 Input terminal wire colors ...................................................... 5-6
Table 5-2 Power module wire colors ...................................................... 5-7
6 Replaceable Parts
Table 6-1 Model 2750 motherboard parts list ........................................ 6-3
Table 6-2 Model 2750 display board parts list ..................................... 6-12
Table 6-3 Model 2750 backplane board parts list ................................ 6-13
Table 6-4 Model 2750 miscellaneous parts list .................................... 6-14
Table 6-5 Model 7700 module parts list ............................................... 6-15
A Accuracy and Optimization
B Calibration Reference
Table B-1 Remote calibration command summary ................................ B-2
Table B-2 DC calibration commands ..................................................... B-8
Table B-3 AC calibration commands ................................................... B-13
Table B-4 Model 7700 calibration commands ..................................... B-16
Table B-5 Calibration errors ................................................................ B-21
C Calibration Program