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We have a Denon 980R amp. The input selector switch has a mind of its own roaring all around the dial

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The contacts are dirty. I have solved this by rotating around - left and right - a number of times. In the end, however, you need to clean the contacts. I never managed to do this satisfactorily before it burned off somewhere else. Too bad, a very nice amp.

Posted on May 02, 2009

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How can I connect a subwoofer to this device (denon pma-520) http://www.hifiengine.com/manual_library/denon/pma-520.shtml?destination=node%2F14208


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We have a DENON L.C twin transformer amplifier PMA-735R that has an input selector that freaks out now and again. Recently it has gotten worse, it just goes back and forth between tuner and cd etc. for...


Hi Readers to of Fixya,
This entry is January 22, 2016.
I own a Denon PMA 735R which I bought new in 1999, it is very good Amp; starting about a few years ago the input selector would occasionally randomly jump from CD to Phono to Tape etc., but would always end up back at CD so it was not terribly annoying until a few days ago when it started happening all the time. I am a very knowledgeable electronics person (I built musical keyboards at one time) so my thought was just that it was a dust problem and I started with that premise. I fixed it using an Electrical Parts Cleaner spray and here is how I did it:
I unplugged it, removed the CD input RCA cables and removed the L & R speaker cables and took it off its shelf and set it on a towel on my soft sofa; I removed the casing by unscrewing four big silver screws on the sides (my model is silver) and the three small black screws on the back top; I removed the Input Selector indicator knob on the front and the Record Out Selector indicator knob and the Volume knob, I then removed the small nut that holds the three of them tightly in place to the front panel; I then stood it on its back so that the front was facing up; I then sprayed my Electrical Parts Cleaner spray into the Input Selector indicator post liberally and then put the knob back in place and kept turning the indicator back and forth for a few minutes to work the cleaner inside the post down into the circuit board connection; I did the same with the Record Out Selector indicator post and I did the same with the Volume post; I then put the small nuts back on the three posts and tightened them; I then put the knobs back on the three posts; I then stood it back on its normal upright position and put the casing back on and then the screws; I placed back on its shelf and hooked up the cables and switched it back on and played my CD's, it has been working perfectly fine. The whole process took less than 30 minutes.I hope this helps.

Feb 20, 2012 | Denon Audio Players & Recorders

2 Answers

Su-c800u pre-amp switching not steady, keep darting from one mode to another and disrupting smooth flow of music


I had the same issue.the contacts on selector switch is dirty.All u need to get a good contact cleaner and spray the selector rod( remove knob first with preamp facing up), the liguid will find leak into selector and clean contacts.
after doing mine, the slector knob feels more solid when turned and does not change input anymore.
Junior

Jan 14, 2012 | Technics Audio Players & Recorders

1 Answer

I have a Denon 2800 hooked up to a Pioneer DV-C302D and while DVD's thru the Denon, the sound will come on and off. At the same time the Denon will be switching between analog and digital mode. Is one of...


It's a cable or connection.

The Denon apparently has an automatic selector to choose the digital input over the analog input if both are present (my Pioneer does this). The random switching is telling you the digital input is intermittently dropping out and coming back. You don't say if you're using the optical or coaxial digital interface. Coaxial is less prone to connection problems. If you use optical, make sure the ends are clicked in and there are no small radius bends in the cable. Tight curves reduce the optical power. Either way, check the connections and wiggle them to see if you can cause the problem to return.

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1 Answer

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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

No picture on tv


This unit upconverts all video inputs to component output, so connect all your devices to your denon audio and video inputs and component video out of the denon to the tv component in and all should work fine

Feb 21, 2009 | Denon AVR-886 Receiver

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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