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"
Apr 20, 2007 |
Denon AVR-900 Receiver