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Pioneer Model Is21 stereo

One channel is not functioning and cannot switch on from the tuner

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  • Guding Nov 07, 2007

    Thanks for the suggestion. I agree on defective amplifier and on the process of getting replacement STK407-070B. To use it, I have by pass the power on switch on the board but of course with only one channel working.
    I hope you can send me copy of the IC pin assignment.
    Certainly Iam happy for your quick response.

    Thank you very much.



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Switch speaker wires if sound switches then amp probably has a final amp ic.output problem. Try balance control and tape dubbing or loudness buttons to see if any are dirty.
May have to get repairs at a shop if the amp is worth saving.

Good Luck

Posted on Nov 03, 2007


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