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Yamaha amplifier m-85 1986 that plays much louder out of right channel than left. have to trun right gain control way down to match left and turn receiver volume way up causing out of balance sound.

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  • mandjlunebur Jan 04, 2009

    this is a power amplifier that requires a pre-amp which is a yamaha rxv1800

  • mandjlunebur Jan 04, 2009

    when connecting same speaker wires to rxv1800 sound is normal. level meters on m-85 show right channel much higher than left must turn gain on right channel almost all the way down to match left.

  • mandjlunebur Jan 05, 2009

    there is nothing wrong with the speakers they work normaly when receiver power is utilized

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9 Answers

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Testing an amp is quite complicate, you need to have strong electronic background, and to use an oscilloscope and a multimeter in the right way.

Start ensuring that it is not the pre amp. By testing the amp on a different input.

If the amp has same problems on all inputs, then , rather than the balance knob, you have a defective Amp power transistor, in the final part of the amp (near to the speakers output on internal board).

The transistor must be replaced, as it is generating less power than it is supposed two.

You get problem only on one channel just because separate channels have separate transistors aplifying the signal.

Yamaha M-85 user Manual

Posted on Jan 09, 2009

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There are buttons for the setting of the speakers. the look like to rectangles (thin) side by side that say A and B

Posted on Jan 08, 2009

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If you have not tried this yet. switch left and right speakers. If problem is still on the right side, your final drive is failing. You'll need to have the unit repaired. If the problem changes to the left side, you've got a speaker issue. Good Luck 

Posted on Jan 06, 2009

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Hi there
The reason that the sound is not equalized is that there is a dry joint either on the output board or the speaker input board.
I have a amplifier that did the same thing and all i did was re-solder the output and input channels and that sorted it for me.
I hope this works for you too.

Good luck and kind regards

Posted on Jan 06, 2009

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I researched this a Bit since you were here last. Everyone that I found though took it in to an Authorized Service Center and had it Repaired.

Posted on Jan 05, 2009

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Hi and welcome to FixYa,

Initially, a number of possibilities/ideas you may want to consider/explore:

  • signal source - it maybe that the tapedeck, CD player or whatever is being used as the audio source is the issue. Switch positions of the RCA connectors at the output of the signal source. If the imbalance changes sides, then it is the signal source;
  • preamp - Switch positions of the RCA connectors at the output of the preamp. If the imbalance changes sides, then it is the pre-amp;
  • amplifier - Switch positions of the RCA connectors at the input of the amplifier. If the imbalance changes sides, then it is not the amplifier;
  • speakers - Switch speaker wires left to right, right to left. If imbalance changes sides, then it is speaker or speaker wire. If still the same, then it is the amplifier;
  • of course the RCA/cables could also affect
  • welcomejee has actually mentioned possibility of the volume control if still uses the rotary type. A spray of electronic contact could be a temporary workaround.
Good luck and Thank you for using FixYa.

Posted on Jan 04, 2009

  • Louie  Role
    Louie Role Jan 06, 2009

    There were a couple of checks above, any updates on the results?

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Hi

I believe the transistor of your right side speaker is burned or is damaged please check. If this is not the case then you need to increase the value of resistor which is attached next to the transistor .

Thankyou

Posted on Jan 04, 2009

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Wires to speakers need to be of same gauge and of same length..and connections clean..switch wires to test at amp if conditions switch.. and advise ..good luck

Posted on Jan 04, 2009

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Does this amp has rotating volume control?

Posted on Jan 04, 2009

  • Shahid Electronics
    Shahid Electronics Jan 04, 2009

    right, its an older power amplifier.
    It has push selectors on front panel and in my opiion needs to be cleaned as contacts of selector switches are rusty / clogged.
    Please unplug amp from Ac outlet, take off top-cover of amp and spray WD-40 in all selector switches including its left-right level controls. 
    This will resolve unbalanced level issue in this amp.

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