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TROUBLESHOOTING & REPAIR
F-80 F-80
COMMANDER 400
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ABNORMAL EXCITER VOLTAGE FEEDBACK WAVEFORMS
1 V
2 ms
This is an example of a bad wave-
form at one of the Exciter Module
outputs (J4 pin 3 to pin 7).
Note: The distortion in the waveform
that causes the period to be in
excess of 9.5 ms. Any distor-
tion that causes a period in
excess of 9.0 ms requires the
Exciter Module to be replaced.
This distorted waveform can
cause machine shutdowns
with “CSS”, “ECL”, & “ECH”
error codes on the display,
and can cause “CRS” and “---”
error codes at power-up. It
can also cause flare-ups and
welds that are too hot, “spat-
tery”, or “cannon balling”.
SCOPE SETTINGS
Volts/Div.......................1V/Div.
Horizontal ..................2ms/Div.
Coupling.............................DC
Trigger.........................Internal