Troubleshooting When One Or More Inputs Look Good - HP 8753E Service Manual

Troubleshooting When One or More Inputs Look Good

Since at least one input is good, all of the common receiver circuitry beyond the
multiplexer is functional. Only the status of the individual sampler/mixers and
their individual signal paths is undetermined.
Check the 4 kHz Signal
Press
2. Use an oscilloscope to check the 4 kHz output of the sampler/mixer in
question at the Al0 assembly. The input and output access pins are listed in
If the signal is good, continue with "Check the Trace with the Sampler
q
Correction Constants Off n.
If the signal is bad, skip ahead to "Check 1st Lo SiiaI at Sampler/Mixer".
q
Mnemonic
I I
I
Receiver Troubleshooting
I
I