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Troubleshooting the Analyzer
To troubleshoot source and calibrator out failures
the source sine wave at the failing values. If the signal is
incorrect, go to Step 7.
f Set the oscilloscope to 600 mV/div.
g Press the following keys:
[DC offset]
[
Marker/Entry]
h Rotate the RPG knob while monitoring the oscilloscope. The sine
wave dc offset value should change from +1 V to -1 V as the RPG
knob is turned.
To keep the sine wave displayed, adjust the oscilloscope’s trigger
level while varying the dc offset value.
i If the dc offset function operates correctly, go to Step 3.
2 Check the DC offset control signals.
a Place the analyzer on the side closest to the display.
b Remove the bottom cover.
c Press the following keys:
[Preset]
[
Source]
[
source on]
[DC offset
]
[
Marker/Entry]
d Using a logic probe, check the TTL signals listed in the following
table while rotating the RPG knob. The signals should toggle as
the dc offset is varied from minimum to maximum.
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