Service manual

108 4

Troubleshooting

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This chapter contains the following troubleshooting procedures. By performing them in the

order listed below, you can identify the faulty assembly or the faulty group efficiently.

1. Disconnect everything from the 4294A: All GPIB cable, printer cable, and accessory.

2. Perform the INSPECT THE POWER-ON SEQUENCE in this chapter.

3. Perform the INSPECT THE REAR PANEL FEATURE in this chapter.

4. Perform the INTERNAL TESTS FAILURE TROUBLESHOOTING in this chapter.

5. Perform the EXTERNAL TESTS FAILURE TROUBLESHOOTING in this chapter.

6. Perform the performance tests in the Performance Test chapter and refer to

PERFORMANCE TEST FAILURE TROUBLESHOOTING in this chapter.

If the 4294A has passed all of the checks but it still making incorrect measurements or

unexpected operations, suspect the accessories. Accessories such as four-terminal-pair test

leads and fixtures can all induce system problems.