Question about Denon DRA-275R
The screen is working, all buttons and switches too, but I don't hear "Click" sound from relay what applies power to output amplifiers when I start up the receiver. One of transistors C1841 in power amp is hot, but the transistor itself is OK and I found DC voltage (around 9V not stable)on 1 output from preamp BA!15218 (this IC is OK as well, I replaced it for the new one).
Could somebody give me advise?
Thanks a lot.
SOURCE: Denon AVR-3105 Unit tries to
Look for open resistors in the same area. Also, if the transistors that you replaced are the output transistors, you should replace their compliments as well. I don't have the service manual with me at the moment, so I'm juist giving you generalities. If you can, lift the center pin of the output transistors and measure (and post) the voltage readings on each of three pads for each transistor. That should give me enough info to guide you further.
Posted on Oct 07, 2008
Without looking at the schematics for this particular model, I'd surmise that the click is indeed a speaker protection relay. Generally this is fed by a number of different sense circuits that watch for power amp issues and/or excess speaker current and/or power supply output stability. Although the relays do indeed fail at times, generally it is not the relay that is at fault. If you have a scope and a schematic, you can check the various circuits that feed the relay for the exact cause. If not, you can do some experiments that might help deduce the problem: e.g. do headphones work when speakers do not, does the relay click on when no speakers are connected (or selected), etc. In my experience, it is most often the output transistor(s) in the power amp. But not always ;-)
Posted on Oct 15, 2008
Turn off zone 2 then turn your receiver on the main zone on Radio, tune in a station and check for audio. Post a comment and let me know if audio works that way. If you don't have any audio, list your other equipment makes and models as well as how they are interconnected to your receiver (cable type) and I will help you troubleshoot
Posted on Jul 01, 2009
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