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Old 17th Sep 2020, 12:16 pm   #107
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: Uher CR 240 AV Cassette Recorder

Quote:
Originally Posted by DMcMahon View Post
Have now spotted C24. around transistor T6, something to do with the control of the IC1 Op Amp for the line outputs to the DIN connectors.
Not sure if this will help but so far as I can make out T4 and T5 mute the inputs to the line output amplifiers, the mute control voltage comes in at the junction of R49 and R50.

When in Record it's via D1 and switch contacts 47-48.

When in Pause it's via D2 and R83.

When in Rew/FF it's via T6.

Same for the input to the audio output amplifiers (by T8 and T9) except that the mute function is overridden in Record by the action of T7.

Lawrence.
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