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I have no sound coming from my amp a rotel rb 981 and rc 980bx . I was changing speaker wires and am afraid i have blown a fuse [but cannot find external one]. powers up but no sound

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It is never advised to change wires while the amp is switched on. you may have blown your diodes on your post amp then you have a problem.
have you tried other speakers tested your speaker on another system to rule them out as OK?
if you open the case be careful not to touch any large capacitor as they may still be chared and can give you a nasty belt.
any fuses should be easy to find and to see if they are blown. ensure you get the same rate fuse when you replace. if you see any charing of diodes then i think repair may be costly. good luck.

Posted on Nov 12, 2009

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Posted on Jan 02, 2017

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How to connect my Bose 901 series vI speaker to yamaha rx v740 and rotel rb 1582. Appreciate your help. Thanks


The Bose controller gets wired in series between the pre-amp and the power amp.

I presume you plan to use the 901's as the front L&R pair. So the cables going from the 740's Pre-Out Front L&R go to the inputs on the Bose controller. The outputs of the Bose controller go to the power amp Front L&R channel inputs.

Aug 17, 2014 | Audio Players & Recorders

Tip

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.
FOR MORE DETAILS CHECK THE LINKS
http://electro-medical.blogspot.in/search/label/ELECTRO%20MED%20SERVICES
http://electro-medical.blogspot.in/

on May 17, 2015 | Miscellaneous

1 Answer

Not playing in stereo


You have blowin a IC in it, Power amps are not suppose to be use for the purpose you were useing it for.You are dam lucky they didn,t go up in smoke.

Oct 16, 2012 | Rotel Audio Players & Recorders

1 Answer

Fuse for rotel amp for RB-870BX


IF THE FUSE YOU ARE PLACING IS THE SAME TYPE AS THE ORIGINAL YOUR AMP HAS A PROBLEM WHAT YOU MUST DO IS TO SLIGHTY INCREASE FUSE BY 100 MAMPS PER TIME IF IT IS IN THE TRANSFORMER CIRCUIT YOU CAN INCRESE IT BY 2 AMP MAX IF IT IS IN THE MOSFETS CIRCUIT YOU CAN INCRESE IT BY A MAXIMUM OF 500MAMP LET ME KNOW THE RESULTS

Mar 04, 2012 | Rotel Audio Players & Recorders

1 Answer

Power amp r b 981 no power to the speakers. Pre amp seems to be ok. Headphones work.


Check the headphone socket if it cuts out the speakers (normal use) when you plug the headphones in. If it doesn't and you have a switch to switch off the speakers when listening to headphones, check the switch. It may be physical damage or dirt causing the problem, or even loose soldering on the headphone socket. But the fact that headphones work shows the main amp is working. Also make certain the speakers are connected properly.

Sep 28, 2010 | Rotel Audio Players & Recorders

1 Answer

No sound to remote speakers in dining & deck areas.


Incoming from WHAT? Ampifiers accept inputs via RCA connections and send amplified audio to the speakers via the + and - OUTPUT terminals.

I'm guessing your colored wires are from your speakers and that there is a piece of this puzzle we do not see - how the speakers on the deck and in the dining area are wired.

You say, "was working ok previously"... previous to WHAT? Something changed.

You can probably troubleshoot and resolve this yourself.

Set the amp to a medium output level.

If the wires are simply leading to either or both pairs of speakers you could select any two of them and connect them to one side of the amp. Only a pair going to the same speaker(s) will produce sound. Once you identify one pair, the other pair probably goes to the other speakers. Connect them to the other channel output.

The last piece would be to establish correct phasing between the speakers. Bass response will suffer if they're not IN-phase. Play something with substantial bass. Listen closely, then reverse the wires on one side only. Test again. If it IMPROVES you have it right. If it losses bass, put the wires back the way they were.

Apr 27, 2010 | Rotel RMB-1095 Power Amplifier

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Free booklet/part #149393


http://www.bose.com/pdf/customer_service/owners/og_901.pdf

Jan 10, 2008 | Bose 901 VI Main / Stereo Speaker

1 Answer

Rotel ra-820 amp speaker ports dieing


You may have blown a fuse on the left channel due to speaker wires shorting or a defective speaker. If there are no fuses on the rear of the amp there are probably internal fuses. They are usually glass with a small wire running from end to end. If the fuse is blown the wire will be broken. Replace with the same value of fuse.

Aug 27, 2007 | Audio Players & Recorders

2 Answers

Rotel Amp center channel out


if you say you checked the wireing ,did you check the speaker. disconnect on of the other speakers and connect up the center to see if you get sound. still no sound speakers bad. Got sound try unpluging unit for a couple of hours then try it again. still no center . Time for the repair shop. Good Luck

May 26, 2006 | Rotel RMB-1095 Power Amplifier

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