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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 2 signal switching .............................................................. 4-18

Table 4-8 4 signal switching .............................................................. 4-19

Table 4-9 4 dry circuit signal switching ............................................ 4-20

Table 4-10 2/4 reference signal switching ........................................ 4-20

Table 4-13 ACA signal switching .......................................................... 4-21

Table 4-11 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 2 signal multiplexing and gain .......................................... 4-23

Table 4-18 4 signal multiplexing and gain .......................................... 4-23

Table 4-19 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

Keithley 2750 Service Manual

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