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
l- Press Lpreset) LMenu) ~~~~~.
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
lhble 8-2. The signal should resemble the waveform of Figure 8-6.
q If the signal is good, continue with “Check the Trace with the Sampler
Correction Constants Off n.
q If the signal is bad, skip ahead to “Check 1st Lo SiiaI at Sampler/Mixer”.
‘ItLble 8-2. 2nd IF (4 kHz) Signal Locations
I
Mnemonic
I
DeecrlPtlon
I
A10 Locatlou
I
slgual solute
I
lm
IFA
IFB
4kHz
AlOPl-1, 31
A4Pl-6
4kHz AlOPl-4, 34
ASPl-6
4kHz
AlOPl-7, 37
A6Pl-6
Receiver Troubleshooting 8-l 1

HP 8753E Specifications

General

Brand	HP
Model	8753E
Category	Measuring Instruments
Language	English