Question about Denon AVR-3805 Receiver

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Blown output on Denon AVR3805

I very stupidly managed to short one of the output channels(surround back right, I think) on my reciever. I replaced the slow blow 3.15A internal fuse and it now tries to power up but goes into protect. Since I don't have ay circuit diagrams I took it to a local repair shop but they said it was rather a complex problem and they couldn't fix it without the service manuals/circuit diagrams. Surley this is likely to be an output transistor? The trouble is I don't know which one without the circuit diagram, and even then I'm not sure how to test it proprly to make sure. The other option is to buy a service manual from service manual.net but I don't want to do this if it's going top be no use, and I don't really want to take it to a denon dealer as the cost will probably be astronomical, and I was thinking of upgrading to a new onkyo soon anyway.

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This unit does not use "output transistors". The driver section uses hybrid packs that are usually two to a set. Knowing which set to replace is only part of the problem when replaced as bias voltage Must be correct...accordianman

Posted on Apr 23, 2008

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Sure, if you want to hear Surround Back program material coming from the subs without midrange or tweeters. (Sarcastic) Of course, the LFE program material will still be going into a black hole somewhere.

Run the subs in series with each other -
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Run the speaker level adjustments routine and enjoy.

Just for giggles, try what you were thinking about. You won't hear much from the sub(s) unless you programmed the Surround Back channel as full-range and then have something like the Apollo 13 launch for program material. Normal audio won't send much low-frequency material to those channels. The optimal place for subs is on the LFE or sub channel.

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hi there
have u tried connecting the centre speaker to another amplifier to see if the speaker actually works....

if it does then it cud be the output transistors blown or the actual OP-Amp for that channel

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First pair of ceiling speakers would be left and right front from speaker A or Main output behind your receiver.
Second ONE,but a pair would be connect to the center channel output as your center speaker.
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For Zone two,you would need to connect your other pair of speakers to surround BACK left and right output.
Go to your Denon MENU button,depending on which model you have,some of them will have an on-screen display feature(you would need to have a composite video cable connect from the video output behind your receiver to the TV video input in order to use the on screen menu.)If not,you would have to it view on the front panel of the A/V receiver.
You need to read the detail on how to setup the video and audio as well as distance and DB for the receiver through the menu button.
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solutiondoct

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Finals/outputs are toast. Get it serviced to get back to sweet music...accordianman

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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.

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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.

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