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Chapter 6 Disassembly and Repair
Self-Test Procedures
4
6
626 - 629 626: Self-test failed; waveform filter path select relay
627: Self-test failed; -10 dB attenuator path
628: Self-test failed; -20 dB attenuator path
629: Self-test failed; +20 dB amplifier path
These errors indicate that the specified relay is not being properly
switched or the attenuator/amplifier is not providing the expected
amplification or gain. These self-tests use the internal ADC to verify that
attenuators are operating properly.
630 Self-test failed; internal ADC over-range condition
This error indicates a probable ADC failure. The failure could be of the
system ADC, the ADC input multiplexer, or the ADC input buffer
amplifier.
631 Self-test failed; internal ADC measurement error
This error indicates a probable ADC failure. The failure could be of the
system ADC, the ADC input multiplexer, or the ADC input buffer
amplifier.
632 Self-test failed; square/pulse DAC test failure
This error indicates a probable failure of the square/pulse DAC.
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