Is it a bad relay? - Rotel 990BX - diyAudio
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Old 16th January 2007, 06:57 PM   #1
sam562 is offline sam562  United States
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Join Date: Oct 2006
Default Is it a bad relay? - Rotel 990BX


I have a Rotel 990BX Power amplifier that I think has a bad relay:

With the preamp on and music playing, when you switch the Rotel:

*ON* - Right speaker comes on immediately, then after a 3-counts, the protection light goes off and Left speaker comes on.

*OFF* - Protection light and Left speaker go off immediately - Right speaker trails off like when you lose a radio station driving through the sparser parts of New Mexico.

The protection/relay is supposed to mute both speakers on power up so there is no "pop", also it mutes them on power down - I think its just not working for the right side

I took it by a local electronics repair place and after plugging it in and turning it on, they said that it was obviously something major since they could hear the relay/protection circuit engage and disengage, therefore something was shorted and dangerous DC voltage was going to fry my speakers. I did thank him and offered to pay him for his advice but he refused. Could he be right though?

Rotel 990BX relay

- Sam
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Old 16th January 2007, 07:00 PM   #2
anatech is offline anatech  Canada
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Location: Georgetown, On
Hi Sam,
Replace that relay. The contacts on one side are oxidized and not making contact. It is supposed to mute the input. Also check the connecting wires.

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Old 16th January 2007, 07:09 PM   #3
sam562 is offline sam562  United States
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Thanks anatech,... I'm on it.

What a goldmine this forum is!
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Old 26th January 2007, 09:31 PM   #4
sam562 is offline sam562  United States
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Join Date: Oct 2006
Well, I replaced the relay and it still had the same problem!

After a few hours of trying to figure out what it could be I noticed that the stripe on one of the 3-wire internal cables leading to the relay pcb wasn't going to the dot marking on the connecter, it was reversed.

Of course it worked perfectly after I flipped it

Ah well, at least I know the relay is fresh!

Thanks again for your help,
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