Hello: I have a Denon AVR-810 that was damaged about a week ago. I repaired the unit by replacing the fuses, resistors in the main amp section and a voltage regulator for the display section. I also replaced the main output power transistors.
Now when I turn on the receiver everything is OK and I can listen to music at different volume levels through my headphones (no speaker connected).
When I connect the main speakers the unit goes into PROTECTION mode when I turn up the volume. I isolated this problem to the main outputs only and it only comes on when speakers are connected. I checked the bias and it reads about 0.024 Volts (24mV). Is this bias setting correct? Why does this problem come out only when speaker loads are connected?
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Re: Denon AVR-810 going into PROTECTION mode
It sounds like there is a problem with the differential circuit. The bias I am not sure about, as every unit is different. You should get the service manual to be sure or call Denon and see if they can give you an idea. Good Luck
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Probably damaged by power surge. If you do not have experience diagnosing and repairing electronic circuits as well as having access to schematic diagrams then this is not a repair for you. Failure to replace all damaged components may result in damaging new parts.
Yes that is why. The receiver is protecting itself from an un-stable load impedance which causes current/voltage spikes through the final amplifier components and proportionally through the input where the protection relay is (click),. Do not continue using the amp until you have repaired or replaced the blown speakers. A rule of thumb is to maintain 8 ohms on each speaker wire plugged into the amp. Keep that in mind or eventually you will damage it.
This is a protection mode. The receiver protection circuit detects an internal problem like missing power supply voltage or blown channel and shuts down the receiver. You need to bring the unit to a repair facility.
Not familiar with this model but seems like the protection circuit is kicking in, this could be caused by an imbalance of Ohms between channels or a short. remove & check all speakers and cables for continuity or shorts, does the unit power on without speakers or in a different mode (surround off).
always add speakers in pairs (L&R) before testing to prevent possible protection circuit, test main speaker pair first then add surrounds (all according to the allowable Ohms range for the amp of course)
This unit is in what is termed :protect mode". This means that one or more of the amplifier channels has a rpoblem that was detected by the protection circuit inside and the unit has been shutdown to prevent further damage. This is often shorted output transistors or a defective amp pac for the surround channels. Expect a parts cost in the $50 range for this repair.
Your receiver has short circuit somewhere. The protection circuit shut off the unit to prevent more damage. You can try to disconnect all speakers. If there is not improvement, you need to send your receiver to repair.
The protect mode with nothing connected indicates that the output transistors for one or more channels are shorted. These will need to be checked and replaced. This is a simple repair for an experienced audio shop, Figure about $10 for each output transistor and add in another $10-$15 for misc parts that may also be smoked.
Denon AVR-810 was a quite out-dated model. I had owned since 1992. It shown 'Protection' on the screen for 2 months ago and not yet been fixed. Better to replace a modern one or repair it at a reasonable costs.