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Old 19th Jul 2019, 8:14 pm   #4
Uncle Bulgaria
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Join Date: May 2016
Location: Cornwall, UK.
Posts: 2,335
Default Re: Uher CR240 Troubleshooting Best Practice

I've got it running after a fashion, but have a further problem. The left channel starts strongly and fades to near silence after several seconds. The right continues fine.

If I turn it off then immediately back on again, the same thing happens. I've tried to scope the signal but I'm not having much luck as some of the boards are inaccessible when enough are in for the path to be complete.

It seemed reasonable to assume a capacitor would cause this issue, but touching the very first point where the tape head meets the first circuit board gives me a buzz in the left channel that varies with volume, so it's going through the path all right.

I have removed and checked almost all the components of board 300 (Recording/Playback Amplifier).

The head has the same resistance for left and right.

Any ideas?
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File Type: pdf uher_cr-240_Circuit_Diagram.pdf (1.72 MB, 172 views)
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