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RE: Sony Cassette Deck Low Playback Volume problem

Posted by rotovator (A) on June 3, 2007 at 15:51:37

In Reply to: RE: Sony Cassette Deck Low Playback Volume problem posted by mcdmgb on June 3, 2007 at 08:03:44:

I don't think that adjusting bias level could do any good if recording is so bad. Anyway, it's a good idea to turn pots to prevent bad contacts from oxide in the pot itself. And the worst you can do is to dis-adjust the bias level, not catastrophic. You can measure with a resistence-meter before to be able to leave the pot as you found it.

The bias circuit is the most prone to fail in decks. Specially the capacitors in the oscillator. With an oscilloscope or a AC-voltmeter you could check the circuit function. It has a small transformer (can be cylindrical) that raises the output voltage to the erase head and recording circuit up to more than 80-100 volts. Check for that AC-voltage when recording, for example, in the pins of the recording or erasing head.

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