wandel-gol: SPM-3; Selektiver Pegelmesser

I recently aquired an SPM-3 in excellent condition, except it does not work on either selective or wideband. Fuses are OK.

Meter pointer jumps when unit is switced on.

I do have the schematics. I wondered if others have had this issue and what the problem was.

I am thinking the input amplifier 1st transistor??

Not sure where to start.

 

Don

VA3DDN

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Dear Mr. Dorward
I do not know the device. First thing I would check the operating voltage. If this voltage is OK, check all voltages according to the scheme, starting from the input of the signal path.
I've uploaded 6 files (adj1-6) to the model. Maybe the adjustment tables helps you further.

best regards
Pius

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