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Anonymous Posted on Nov 15, 2013
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Rb1080 amplifier has a hum in the left channel

Rotel rb1080 amplifier has a hum in left channel. can hear the hum in the left speaker.

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5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Feb 01, 2007

SOURCE: Output volume has dropped in right channel

dear sir,pls check the HT voltage fuse, LTsupplay also and out put stage,and volume controle,

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Anonymous

  • 319 Answers
  • Posted on Apr 17, 2008

SOURCE: Rotel RMB-1095 Power Amplifier Problem

Sounds like wiring problems. Unhook everything, then get owners manual for proper instruction

petraman7

Scott Frye

  • 1175 Answers
  • Posted on Mar 25, 2009

SOURCE: Adcom 7500, Adcom 5400(bi-amp), Marantz AV-9000, Dakiom HA103

Try just the power amp on ..nothing connected
no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop.
If there's hum with just the Adcom..then it's the ADCOM

Anonymous

  • 66 Answers
  • Posted on May 05, 2009

SOURCE: Marantz Pm-7200 left channel weak compared to the right

hmmm. Let's start by swapping the wires you are using for your speakers. Double check the wire connections first, then take the left and place iton the right and vice versa.

marcandreauc

Marc Auclair

  • 1 Answer
  • Posted on Jul 22, 2012

SOURCE: Behringer EP2500 amplifier channel crackling noise

Got asilimar problemwit a behringer europower pmh 3000.
my

The Right channel began to crack up and drizzle now it seems completely dead.
Changed the cables both of input and seapkers , still the problem stays the same. Any suggestion before brigning for a month at the repair shop? And get out with a 200-400$ bill ?

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Rotel RHB-10 amp channel not working
YOU ARE NOT RIGHT IT SHOULD GIVE AT LAEST A LOW VOLUME SOUND WITH A LOT OF DISTORSION AND A CRACKING NOISE IF DOES I GUESS THAT YOU HAD THIS AMP IN A PLACE WITH A LOT OF HUMIDITY AND YOU HAVEN'T WORK IT FOR SOME TIME IF I AM RIGHT PUT YOUR AMP IN THE SUN AND WORK IT FOR 10 MIN WITH A 5 MIN BREAK LET ME KNOW THE RESULTS
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Nov 14, 2012 • Rotel 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/
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Use an amplifier with NO MORE than 150 Watts per channel or you be buying new speakers. At this power level don't expect booming bass boost without damaging the speakers. The Rotel generates 130 per side which is very near the safe maximum for those speakers... and the specs look good. If you are not satified with the sound, the speakers are LIKELY the problem. Look at getting good commercial speaakers instead of CONSUMER grade speakers. Go to a music store dealing with bands and musicians and view the products they have to offer. Consumer speakers often fail when people turn up too much bass. At high listening levels hearing damage can result.
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Good day sir, Hi, your Philips receiver trouble can be any of the ff:
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  2. your main IC amplifier for the left channel is bad. you need to replace that IC, but check first the wiring of the speakers.
  3. Check your receiver left speakers if it is producing a soft hum, to do this turn down the right channel, or adjusting the balance knob to the left, or simply remove the speaker connection of the right channel. place your ears on the left speaker as you adjust the volume up and down, do you hear a soft hum that goes up and down also? If yes the problem is on the source section before main amplification, usually the pre-amplifier stage, If you hear no hum at all. problem with the main left amplifier. The main amplifier is usually a single IC for both left and right channel, OR one IC amplifier for the left and one for the right, in both cases, replace the bad IC.
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This sounds like there is a problem with the final output stage. Is this a new amp? Is it under warranty?

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Sounds like wiring problems. Unhook everything, then get owners manual for proper instruction
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I have a 3yr old Rotel Amp RB1080 with RC1070, problem no sound all lights working all fuses good.
This unit is in protect mode. The outputs are disabled to prevent further damage to either the amp or the speakers. If you are not comfortable with electronics, bring this to a servicer. Expect a parts cost in the range of $15-$40 plus the local labor rate.
Dan
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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
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