Question about Denon AVR-1906 Receiver
I had exactly the same problem. On youtube there is a video that advises to replace 2 voltage regulators on a heatsink on the left.
After removing the complete backpanel I was able to mount 2 new regulators 7815 and 7915 (using mica insulation sheets etc). After this I still could not measure the 15 V DC behind the regulator. Thorough inspection of the most left vertical PCB, which has been mounted on the board with the voltage regulators, learned that 4 diodes type 1N4007 and 4 resistors (0.22 ohm, 1W, metalfilm) had been burnt. 2 diodes had shortcircuit in both directions. From a service manual I downloaded for free from the Internet I learned that these 4 diodes do deliver the direct current to the voltage regulators I already replaced. These 4 diodes and 4 resistors can easily be replaced because they can directly be reached. After replacement I started the machine and happily the red light turned green and the machine is perfectly OK. Cost of all parts ca EUR 5,- :-) Part numbers in service manual: D523-D526 and R516-R519. Hope I can help anyone to save this great receiver from the garbage dump.
Posted on Mar 28, 2015
If your amp looks like it's going to work as normal (ie the front display lights up as it should etc), but then the amp goes into protection mode when the anti-thud circuit times out, then I know what's likely to be wrong.
It's one of the power amplifier channels which has gone faulty.
I just found this out after having this problem with my AVR-1906.
I took the amp apart and de-soldered the suspected channel power transistors (centre channel in my case).....and hey-presto! it fired up as normal (obviously the centre channel would be out of service).
I have ordered the replacement transistors from Farnell (UK) at a miserly cost of around £2-£3 each.
Just waiting for them to arrive.
An alternative is, if you don't use all your channels, take the transistors from a known working but not needed channel and swap them over with the duff ones.
Hope thats of use!
Posted on Aug 16, 2008
Sounds like overload protection
turn the volume all the way down, then turn it on
if that doesn't do it you may have a short in one of the speaker lines - try disconnecting them one at a time
Posted on Jan 13, 2008
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Posted on Jan 02, 2017
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