Question about Sony STR-DE635 Receiver

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Looking fot tech help

Looking for another TV TEC to help with internal help. Have no sound on unit and the word "protector" is flashing in the display-she also said she could tap-push on the front of the unit and the sound would come back, and she also heard what she described as a relay clicking. Customer complained of this problem and brought unit in. I could not get the unit to act up at first. Used cooler and sound did go out. Resolded IC 501 & 601. and now the protector light is blinking and still no sound and have never heard the clicking she refered to.

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The clicking might have been the speaker relay attempting to engage. Measure any DC on the output transistors. You should see (B+/-,0.0 and +/- 0/6V). Anything else and the protection circuit will kick in. Update this with the measurements and we'll go from there. Note that this unmit may have darlingtons in it in which case the +/- 0.6 will be +/- 1.1

Dan

Posted on Mar 27, 2008

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