Question about Denon Audio & Video Receivers

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Denon DRA-25/25L Stereo Receiver. On power up the display lights but no sound is produced by the unit. When working normally a click (relay?) is heard about 5secs after power up and normal speaker output then follows. When the unit fails this click is missing (although the display is lit). Is there a Relay driven by the Power Supply?. If so where is it located?.Or, is this the speaker protection system?

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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

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