Question about Denon AVR-1804 Receiver

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My Denon is in Protect mode, what can I do to change this back to normal mode. I do not have the remote control either?

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  • Denon Master
  • 1,114 Answers

First, disconnect all speaker wires at the receiver and turn it back on. If it stays on, your receiver is ok and you need to check each wire and each speaker by re-connecting them one by one and re powering the receiver. You will either fix the problem or find the problem by doing this. It's either a bad speaker or a wire is shorted in line or at the receiver or speaker. It's the most common problem of all. If your receiver still shuts down, it needs to be serviced. Hope this helps

Posted on Sep 23, 2009

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Posted on Jan 02, 2017

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http://assets.denon.com/DocumentMaster/us/Owners%20Manual%20-%20English_AVR-X1000.pdf


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Sign up with Denon and you can download you manual: Here's the link. http://usa.denon.com/ArchivedMicroSystems.asp?archivedModelSearch=true&clearCurrent=true&archivedCategory=Micro&archivedModel=D-M50S&imageField.x=16&imageField.y=11

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All of the Denon recievers I have repaired (over 100) that shut down after a very short time are going into protect mode. The display lights up and after about 10 seconds the display goes out and the standby led blinks red.
I have found that they have one of 3 possible problems and they all require that the reciever be taken apart and fixed at component level. No way to tell what your problem is until it gets put on a bench and troubleshot.

Problem 1. This is the most common problem. One of the front channels shorts out. On the big heat sink the front channels are at each end. It is the front left channel (close to the display) This requires that the output transistors be replaced as well as some driver transistors and some resistors and a capacitor. Lots of work for a blown channel. Denon has put out a bullitin to upgrade the bias transistor and change a couple of resistors to help compensate for this failure. That channel overheats more than any other channel.

Problem 2. There is a resistor that is right next to the preamp board that opens up. It is a 10 ohm 1 watt resistor and when it opens, it causes the unit to go into protect.

Problem 3. The +12 volt regulator fails. It is in the power supply area on a smal heat sink right next to the -12 volt regulator. Generic part number is KIA7812 It also causes the unit to go into protect.

Most decent repair shops can fix these from about $120 up to about $200. Depending on which problem it is and how fast they are at finding the problem. Most charge labor by the hour.

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