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Receiver loses one channel

Discussion in 'Electronic Repair' started by alpha_uma, Jul 20, 2004.

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  1. alpha_uma

    alpha_uma Guest

    I have an old Toshiba SA-5000 receiver. It has two "Tape" inputs. "Tape1" is
    having a problem. More often than not, it always loses the left channel when
    the receiver is powered up. If I switch the selector knob back and forth
    quickly a few times between "Tape1" and "Source", the left channel might
    come back OK, but then after a while, it will lose the signal again.
    Everything else seems to be working fine.

    Could it be just a simple oxide-related "contact" problem at the selector
    knob, or is it more likely to be caused by some failing transistor(s) and/or
    capacitor(s)? Could you recommend a good brand of contact cleaner?

    I have no experience in repairing amplifiers and receivers, but I do have
    some working knowledge with electronics--mostly digital computer circuits. I
    would appreciate any suggestion as to possible causes of this type of
    circuit misbehavior to get me in the right troubleshooting direction.

  2. Mark W Smith

    Mark W Smith Guest

    You are most likely right about the contact problem. Clean all controls with
    a good spray cleaner. I have found that the older units need the real good
    stuff like Caig De-Oxit Red. It's a little expensive, but the cheaper stuff
    doesn't last very long.
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