Question about Sony STR-D665 Receiver

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I have a STR-D665 FM-AM Reciever. It worked fine before I moved but now after about 5 minutes of play it will click and flash "Protect". Is there a way to reset this? Do I have something wired incorrectly?

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When you moved did you put somethink on it so that it does not have good ventillation through itself to keep it from overheating? Or set it down in a way that it does not have ventilation room under it? Some papers set on top of it or a pillow under it would block good cooling ventilation through it.

Posted on Jan 21, 2009

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1 Answer

Why is protect is flashing on display


There is a defect that is causing the light to come on. It could be a bad output transistor or some other defect that produces excessive heat. The cooling fan could be at fault too.

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Sony reciever shows protect on display


May be bad connections on the preamp ic's. Otherwise there is a short in the amp that needs to be repaired.

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How do I go from "Protect: mode back to FM play on


The word protect will engage when you have output problem and will shut the audio off so no sound is available, however if the sound is working normally with protect visible then there is clearly processor issue, something I have never seen before. But it should be checked by a qualified tech.

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My sony str de605 am/fm reciever flashes "Protector", is there something I need to replace internally?


Hiya, not sure if i remember correctly but try reset it. First disconnect the speakers (make sure error isnt there)
When it is ON, press and hold the power button for about 4 seconds. It should then ask reset, clear or something and press enter. When its finished, try it again. If ok, reconnect speakers. If it happens with speakers, there is a problem. If it doesnt work and goes straight back to protect, then there is an internal fault (if i have the reset procedure correct)

Best of luck

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Sony GX57ES FM/AM Receiver does not come on


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"Protect" flashing on STR-D665 Receiver


Check if you connect corectly the speakers wiresnand if they are right connected the audio amplifier Ic are damaged

Nov 28, 2008 | Sony STR-D665 Receiver

1 Answer

Sony STR-D665


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.

Sep 16, 2008 | Sony STR-D665 Receiver

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Power Amp IC gone in your set, replace it.

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No output on main speakers


I have experienced a similar problem with my Sony STR-GX57ES and took it to a certified tech only to find it needed the power supply replaced. I opted to hunt down a compatible power supply but have been unsucessful thus far. That being said I picked up an STR-D665 for next to nothing and found the power supplies to be quite different (you would hope so any, with the ES meaning Elivated Standard and all) but with the D665 working flawlessly I'd rather have something working than nothing. Good luck!

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