Question about Sony STR-DE635 Receiver
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.
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
Posted on Mar 27, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
The protective device on the receiver has been activated because of a short circuit.
("PROTECTOR" flashes.) Turn off the receiver, eliminate the short-circuit problem and turn on the power again.
Generally speaking, an amp protects itself from heat, shorts and overloads.
Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.
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