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I have a Sony TA FB940R (HiFi stereo amp) and the volume control reverts to the silent position, ie it rols back and won't stay put. As if a damper has been damaged or stopped working. Can you suggest a fix please, any help much appreciated

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  • u2_jeff Oct 25, 2008

    Thanks very much, and for posting so quick


  • u2_jeff Oct 25, 2008

    Thanks you are a real pro


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Hi,
If you are tech guy then follow below technical instructions to fix your Amp problem.
Amp has motorized volume control and motor drive circuit has problem so motor rotates just one side (ends up volume) Below picture shows how is motor board and what drive IC is to power the volume motor.
You need to check voltages at pins and replace bad IC.

I have a Sony TA - 02e7045.jpg

f090c04.jpg
It is very simple circuit and easy to repair.
Good luck.

Posted on Oct 25, 2008

  • Shahid Electronics
    Shahid Electronics Oct 25, 2008

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