Keithley 2701, Service Manual

Page: 14 / 168

4 Troubleshooting
Table 4-1 Flash memory failure modes .................................................. 4-3
Table 4-2 Power supply components ...................................................... 4-6
Table 4-3 Display board checks ........................................................... 4-13
Table 4-4 Power supply checks ............................................................ 4-13
Table 4-5 Digital circuitry checks ........................................................ 4-14
Table 4-6 DCV signal switching .......................................................... 4-14
Table 4-8
Ω
2 signal switching .............................................................. 4-15
Table 4-7 ACV and FREQ signal switching ........................................ 4-15
Table 4-10
Ω
2/
Ω
4 reference switching .................................................. 4-16
Table 4-11 DCA signal switching .......................................................... 4-16
Table 4-9
Ω
4 signal switching .............................................................. 4-16
Table 4-13 DCV signal multiplexing and gain ....................................... 4-17
Table 4-14 ACV and ACA signal multiplexing and gain ....................... 4-17
Table 4-12 ACA signal switching .......................................................... 4-17
Table 4-16
Ω
2 signal multiplexing and gain .......................................... 4-18
Table 4-17
Ω
4 signal multiplexing and gain .......................................... 4-18
Table 4-15 DCA signal multiplexing and gain ....................................... 4-18
Table 4-18 Switching device locations ................................................... 4-19
5 Disassembly
Table 5-1 Input terminal wire colors ...................................................... 5-7
Table 5-2 Power module wire colors ...................................................... 5-7
6 Replaceable Parts
Table 6-1 Model 2701 motherboard parts list ........................................ 6-3
Table 6-2 Model 2701 display board parts list ..................................... 6-11
Table 6-3 Model 2701 backplane board parts list ................................ 6-11
Table 6-4 Model 2701 miscellaneous parts list .................................... 6-12
Table 6-5 Model 7700 parts list ............................................................ 6-13
B Calibration Reference
Table B-1 Remote calibration command summary ................................ B-2
Table B-2 DC calibration commands ..................................................... B-9
Table B-3 AC calibration commands ................................................... B-14
Table B-4 Model 7700 calibration commands ..................................... B-17
Table B-5 Calibration error summary .................................................. B-22