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My denon pma 355uk keeps changing channels at random

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Denon PMA-520 amplifier clicking noise

Sounds to me like a bad capacitor, but not sure. I would look inside for any slightly bulging capacitors or capacitors whose plastic wrappings have melted or shrunk or cracked (most caps are cylindrical). Please unplug first and be careful inside there and do not touch anything. I actually came across your post while looking for info on what I think is the same amp my brothers had but blew, and I was going to ask if they still had it so I could repair it. I've been very successful at repairing my electronic equipment such as Altec Lansing Model 95 speaker crossovers, power supply in Emu Emax II, and almost everything else in my studio.

Posted on Oct 29, 2009

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marsrover
  • 682 Answers

SOURCE: Problem with the Denon PMA 6.5 amplifier.

bring a good contact cleaner from radio shack near you and apply spray with pipe in the selector and move it forward and backward.

Posted on Dec 02, 2009

robotek
  • 1512 Answers

SOURCE: Operating Instructions, Denon PMA-535R/PMA-735R

Hi there
You can download one from here Select the FREE download button and you will get a PDF copy of the manual. Let me know if you have any problems getting it. Cheers
regards robotek

Posted on Jan 11, 2010

  • 88 Answers

SOURCE: SERVICE MANUAL FOR DENON PMA-495R

try abeltronics.co.uk

Posted on Feb 08, 2010

dunnbiker
  • 8546 Answers

SOURCE: Deneon PMA-250 amplifier -Volume knob not working correctly

Well, it seems you have your finger on the source of the problem. If accessible, try some tuner cleaner inside the potentiometer.

Posted on Mar 05, 2010

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Manual for denon pms 355uk


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Hi, i have a Denon PMA 735 R amplifier which shuts down when volume increases suddenly.


Sounds like you have output transistor problems. Does it have a red protection light that comes on when it shuts down? If it does it will need serviced.

Dec 06, 2011 | Audio Players & Recorders

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My Denon PMA-900V integrated amp has distortion in the left channel. When it is cold it is very minor, as it heats up and is played at louder volume the distortion is much worse.


The good news is that it's in one channel, which means you have the right channel parts to compare it with. Now the bad news whatever causing it and it's likely to be a semi-conductor (transistor or IC) has to be replaced. However finding it is easier than you might think. For a start it's going to be hot to touch. And you can get get it to stop being hot, while the amps on, so correcting the fault, for a while. You do this by spraying it with Servisol Super Freezer spray. You have to have the amp running for this. Find the left channel amp and wait while it goes bad. Then spray (one at a time) any part you suspect. If the sound returns to normal, you have found the faulty part! To prove it spray the same in the right channel. That shouldn't change.
You can get the freezer spray from your local electric parts shop (such as Maplin UK).

Jan 13, 2011 | Denon PMA-100M Amplifier

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Operating Instructions, Denon PMA-535R/PMA-735R


Hi there
You can download one from here Select the FREE download button and you will get a PDF copy of the manual. Let me know if you have any problems getting it. Cheers
regards robotek

Jan 09, 2010 | Audio Players & Recorders

1 Answer

Problem with the Denon PMA 6.5 amplifier. The source selector keeps on switching between the CD and AUX inputs randomly on its own. Any idea what could be the problem?


bring a good contact cleaner from radio shack near you and apply spray with pipe in the selector and move it forward and backward.

Dec 01, 2009 | Audio Players & Recorders

1 Answer

The source selector just starts changing input sources all by itself. Then once started it might just keeping going for minutes. Is there a way to prevent this from happening?


try to apply a spray(contact cleaner) with long pipe to the selector and move it many times(you can get the contact cleaner from radio shack near you.

Nov 29, 2009 | Denon PMA-2000R 2-Channel Amplifier

4 Answers

DENON Input selector jumps randomly


I have a PMA-535R. Same problem but slightly different dialknob. I fixed it by spraying a contactspray and WD-40 into the knob itself. This does mean you have to disassemble the front of the amp and take out print of the dialknob. The knob has a plastic dustcovere that you will have to lift. Good luck

Sep 18, 2008 | Audio Players & Recorders

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