Is it a bad relay? - Rotel 990BX

sam562 · 16th January 2007, 06:57 PM

Hi,

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

Thanks!
- Sam

anatech · 16th January 2007, 07:00 PM

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.

-Chris

sam562 · 16th January 2007, 07:09 PM

Thanks anatech,... I'm on it.

What a goldmine this forum is!

sam562 · 26th January 2007, 09:31 PM

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 around...lol

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

Thanks again for your help,
-Sam

16th January 2007, 06:57 PM	#1
sam562 diyAudio Member Join Date: Oct 2006	Is it a bad relay? - Rotel 990BX Hi, 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 Thanks! - Sam

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16th January 2007, 07:00 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 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. -Chris

16th January 2007, 07:09 PM	#3
sam562 diyAudio Member Join Date: Oct 2006	Thanks anatech,... I'm on it. What a goldmine this forum is!

26th January 2007, 09:31 PM	#4
sam562 diyAudio Member 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 around...lol Ah well, at least I know the relay is fresh! Thanks again for your help, -Sam

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