I have DENON amplifier PMA-980R It does a strange thing. The input selector button(CD, Tuner,AUX, Data etc) jumps like crazy from one selection to another and I have to turn it of. It does it randomly and sometimes stops, sometimes won't work for days.I can't found any pattern as when it does it. Can you , please help, as it is a fantastic amp and I really want it fixed. Thanks Vesna
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.
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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.
Turn table? You mean like records? lol The output of record players is different voltage than like cd players, etc... Does your stereo have input for turntable or are you hooking it up to an extra rca input? I had mine hooked up wrong before and it did same thing.
If you can follow the circuit from the input of the cd play socket inside the amp itself you might come accross a Memory Retention Capacitor that supplies an IC. If you do. I can't for certain say one will be there, I would replace it, it might be the cause of the lost memory of your device.
If you don't know what a M R C looks like, they are like electrolytic types, but haven the appearance of being squashed. The value will be low only 0.22uf etc and the volts very low say 5.5. The PC board marking will be different to a normal capictor.