don't take my word as anything other than an idea.
I know very little more about car audio than the next guy.
You mention moving this deck from a different car. Is it possible that the installation wasnt the best? Could it have been shaken around?
The thing is old, with the way technology is today, chances are good that if you want to even get it professionally fixed/cleaned (if possible) even looked at it would be cheaper to go out and buy a new deck.
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