Question about Denon AVR-900 Receiver

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Trouble shooting a Denon Reciever

Hi there, I have a denon avr 900 that has worked great for 7 years until the other day there was a pop and everything was out except the "standby" light. Unhooked all the speakers. I opened it up and found a burnt fuse near the power input board. A 6.3 Amp 250 V slow burn fuse. Because I'd never opened the case up before I blew air to clear the dust. Got a replacement fuse and when I plugged the unit in the other fuse went. I replaced it and plugged it in and got a pop sound and smoke near the center of the unit. Checked for any burnt elements, none that I could see. And fuses are fine. Seems fine but now all I get is the "protect" sign on the display. Did I blow the amp? Is it worth fixing? Can I fix it? or is it repair time and money? The unit had been on for a while before but not at a very loud volume. Help! Thanks T. Eastman

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Re: Trouble shooting a Denon Reciever

I had the EXACT same problem... Tried everything that you did with no prevail. I finally took it to a local electrician who discovered that it was the power output set-up/capacitors that had blown... and back to the question of if its worth fixing, I'll have to agree and say it isn't worth repairing. The parts needed to fix this problem generally run about $75. I was able to salvage the parts from another receiver and it requires a total of 10 new parts.

Posted on Nov 17, 2009

Re: Trouble shooting a Denon Reciever

I just picked up a non working AVR 900, there are a total of 4 fuses inside the unit: 2 on the protect board, 6.3A and 8A, and 2 in the middle near the front. I was told by Denon the following might reset the microprocessor. 1) unplug unit 2) press and hold tuner and video select on front panel 3) plug in while holding buttons Unit display should flash until you let go of buttons. Unit stays on you should be ok/ goes back to red- service They also said: There are 3 types of protection that will commonly occur with our receivers. This is designed to protect the unit from permanent damage. 1) Thermal Protect = When the unit overheats this will occur, usually if there is not enough air space above and around the unit. There cannot be anything directly on top of the unit and there must be at least 4 inches of airspace above the unit. 2) Overload Protect = Most commonly occurs when a strand or more of copper speaker wire is not securely connected to the speaker terminal and is touching the chassis of the receiver. If the volume is turned higher than 85% this may also occur. If you need to turn the volume higher than this point to get the level you want, you need a more powerful amp. 3) DC Protect = When an amplifier fails this will occur. This will protect dc current from damaging the speakers. When this happens the unit will need to be serviced. I had a bad 6.3A fuse ? I replaced it and tried to reset. The microprocessor would not reset. I had the exact same results you had. The chip on the back side of the front IC board was smoking. Before I attempted the reset I asked Denon if it was worth sending in for repair. The answer was "NO" BC

Posted on Apr 24, 2007

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