Tip & How-To about Miscellaneous

REPAIR ASSISTANCE

ROTEL RA 980BX
Fault: No output from left channel. The right channel is working fine.

Added some photos and circuit for reference

While testing the amp noticed that the left channel is giving switch on off thump while powering ON and OFF the amplifier. It happens when there is DC voltage flow through the speakers. It shouldn't be there. And the thump is there only on the left channel. While testing the amplifier section found that all the transistors where idling at mentioned voltage. All Base pins where around +/- 0.5volt. and the output is almost 0.012mvdc.
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1 Answer

hi i have a rotel ra-610 amplifier and am having intermitent static on the right hand channel only how do igo about fixing it?


I would prod and poke the channel with an insulated screwdriver this will cause buzz sounds. This should find the cause of the problem. Remember that the left hand channel is identical so you can compare the right with the left. For example if you get a weird buzz on the right when you touch it, but not on the left at the same point you might have found the faulty part.
Don't go near the power supply section as it's nothing to do with that the fault.

Sep 29, 2014 | Audio Players & Recorders

3 Answers

HALLO I HAVE A ROTEL RA 9858X AND AGTER PLAYING FOR A FEW MINUTES I LOSE THE RIGHT SPEAKER CHANEL


Try interchanging the speakers. If the right channel works, you have a problem with your speaker.

Jun 14, 2014 | Rotel Audio Players & Recorders

1 Answer

Rotel RA 12


Hi,
I think RA 12 is not existing type, but RA 12xx types exist.
Please try this link, and I hope you will find the relevant documentation.
Good luck!
gylacz

Mar 18, 2013 | Audio Players & Recorders

1 Answer

No Left Output


check stereo settings after that if it still persists your left channel is goin out

May 21, 2009 | Audio Players & Recorders

1 Answer

Rotel RA 9808X Amplifier


I'd suspect that one of the two output transistors on that channel has gone bad. If you are unsure how to test or troubleshoot this, then you might try replace both the NPN and PNP outputs and catch the bad one that way. If your amp uses an output module then you would of course have to replace the module which would replace all the output transistors on both channels. Good luck. Another thing to look out for, is the emitter bias resistors. They are the large white ceramic ones near the outputs. Sometimes one of those will open up too. They will be of a very small resistance value like .5 ohms (point five ohms) or something in that general ballpark, and have a wattage value of typicaly 5 watts. So they are pretty big resistors. Be sure to check them all even if you do find a bad output transistor. They will often go out with the transistor. Good luck.

Jan 18, 2007 | Rotel RMB-1095 Power Amplifier

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