Question about Sony STR-DE505 Receiver
Posted by Anonymous on
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Posted on Jan 02, 2017
I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.
Re Assembled unit and it worked OK.
I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.
Thanks for the technical help, sure solved my problem.
Posted on Mar 13, 2008
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Posted on Jun 02, 2008
SOURCE: sony str de415 ( protect
You can try tighting the ground screws that hold the circuit boards and heat sink to the chassis, But more times than not it will need a pair of output transistors replaced (and a few resistors). This is a job for a pro. A rough estimate is $100-$130.
Sorry for the bad news.
Posted on Mar 08, 2009
SOURCE: PROTECT DISPLAYED ON RECEIVER
This generally means you've got a short somewhere, and the received is trying to protect itself.
My suggestion is to disconnect all of your speakers at both ends, and reconnect them.
Most times this happens because a speaker wire is lose, and the positive and negative connections are touching each other, causing it to short out.
Posted on Mar 25, 2009
SOURCE: stuck in protect mode
Protet mode is a special diagnostic mode that starts when a fault is detected.
When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.
Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.
Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.
If you do all the above and still get Protect, then there is a real fault.
In that case the unit may be disassembled and tested to find the fault.
If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.
Posted on May 29, 2009
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