Question about Denon AVR-3805 Receiver

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Denon unable to stay on

TV, Cable and Denon receiver power on just fine. After a few seconds or if a channel is changed the Denon unit powers off and goes into standby mode. The area is well vented and the unit is not hot. I have unplugged from power center and plugged directly into outlet to no avail.

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It's likely that you have shorted some speaker outputs, I had that problem and sorted it. Unfortunately it does mean replacing some output transistors..the devices are dificult to get to just to add insult to injury. They are the devices that are mounted directly onto the large heatsink and solder connected to the bottom circuit board. You only have to change the matched pair that you have blown....tricky to identify which ones without some electronics knowledge. The power output section does have some fuses to protect it but sadly these do not appear to be fast enough to stop "one" from damaging the power output stage if you unfortunately short outputs. The transistors are available from Farnell, use pin compatible replacements SAP15N and SAP15P.....all the best. Doctor Bill

Posted on May 27, 2008

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