Need advice on a relay problem

keffan · 30th August 2010, 11:47 PM

The left channel of of my Denon receiver DRA335R intermittently has no sound. I have identified the problem is the relay DH2TU, which connects to the speaker terminals. If I knock on it, I could make it work for a while and then no sound again. The right channel work normal all the time. I wonder if I need to replace the relay, or I can open it up the fix it or some other parts turn off the left channel of the relay. Which vendor sells this kind of relay? Thanks keffan

bob91343 · 31st August 2010, 12:37 AM

It is sometimes possible to repair a relay by cleaning the contacts. It's also easy to knock them out of alignment so that, at best, only one channel will work.

Best to get a new relay. They don't cost much, although as you seem to realize, finding the exact part may be an exercise in frustration. If you can find one with similar specifications, coil voltage and resistance and current rating, you only have the project of making it fit. It doesn't have to be a perfect fit; you can even tie it to the board with a cable tie or glue and run wires, whatever it takes.

Bill_P · 31st August 2010, 11:39 AM

The relay is made by DEC; see the web site at ?????????????DEC. Look for the datasheet for the DH series.

Mooly · 31st August 2010, 12:18 PM

Quote:

Originally Posted by keffan

The left channel of of my Denon receiver DRA335R intermittently has no sound. I have identified the problem is the relay DH2TU, which connects to the speaker terminals. If I knock on it, I could make it work for a while and then no sound again. The right channel work normal all the time. I wonder if I need to replace the relay, or I can open it up the fix it or some other parts turn off the left channel of the relay. Which vendor sells this kind of relay? Thanks keffan

If the top comes off the relay then soak a piece of paper in ISO and carefully draw it through the closed relay contacts to clean them.

Also... check that fault is not poor soldering on relay pins or associated circuitry if it responds to tapping... it may not be the relay.

keffan · 31st August 2010, 10:01 PM

Thanks all for the good advices. keffan

30th August 2010, 11:47 PM	#1
keffan diyAudio Member Join Date: Aug 2010	Need advice on a relay problem The left channel of of my Denon receiver DRA335R intermittently has no sound. I have identified the problem is the relay DH2TU, which connects to the speaker terminals. If I knock on it, I could make it work for a while and then no sound again. The right channel work normal all the time. I wonder if I need to replace the relay, or I can open it up the fix it or some other parts turn off the left channel of the relay. Which vendor sells this kind of relay? Thanks keffan

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31st August 2010, 12:37 AM	#2
bob91343 diyAudio Member Join Date: Mar 2010	It is sometimes possible to repair a relay by cleaning the contacts. It's also easy to knock them out of alignment so that, at best, only one channel will work. Best to get a new relay. They don't cost much, although as you seem to realize, finding the exact part may be an exercise in frustration. If you can find one with similar specifications, coil voltage and resistance and current rating, you only have the project of making it fit. It doesn't have to be a perfect fit; you can even tie it to the board with a cable tie or glue and run wires, whatever it takes.

31st August 2010, 11:39 AM	#3
Bill_P diyAudio Member Join Date: Sep 2009 Location: New York, the vampire state	The relay is made by DEC; see the web site at ?????????????DEC. Look for the datasheet for the DH series.

31st August 2010, 10:01 PM	#5
keffan diyAudio Member Join Date: Aug 2010	Thanks all for the good advices. keffan

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