Denon PMA-980R and problems with input selector? Here's the fix!

[EchoWars]

Witam,
potwierdzam super poradnik juz myślałem o wymianie scalaków aż trafiłem tutaj, w moim PMA 735R jest to trochę łatwiejsze ale zdało egzamin w 100% ju mi nie wariuje na selektorze i wszytko ładnie chodzi chodź wcale ten przełącznik nie był zabrudzony lecz strasznie tłusty ( nie wiem czy ktos go potraktował obficie kontaktem czy jakąś oliwą )
Wyczyściłem, zabezpieczyłem preparatem antykorozyjnym do styków i jak do teraz gra i mnie nie denerwuje

Pozdrawiam i dziękuje

Google translation:

Hi,
I confirm great guide already thinking about replacing scalaków until I came here, in my PMA 735R is a little easier but passed the exam in a 100%'m already going crazy on the selector, and everything does come pretty far, this switch was dirty but not terribly fat (not I know if someone treated him generously with olive oil or some contact)
I cleaned, sealed the preparation corrosion to contact and how to play, and now does not hurt me Regards and thanks

 

[Binkman]

I wonder if it is/ was, also.) an issue that the denons don't over shoot the output? I've got two, one not tested but one AV that just runs on straight or stereo 2 ch. I notice if I crank it pretty well.. it senses the impedance and corrects it. It sounds good but I think the eq circuits on these denon av's even in direct mode are more for tuned studio listening speakers.

Have Yammie that corrects, too. I'm finding newer amps and older amps depend on your listening tastes. That also reflects newer design modular speakers or cabinet designs. And that's a hell of a lot of frequency response when it comes down to soft dome or hard (titanium) tweeters... bla bla mid range and the formidable "woofer"...

Got a love it!!

 

[Neverlance]

Works fine!!!! Thank you aooo much!!!

 

[PhilippKo]

Super Kris, You are a star! Thank you for the instructions. I bought this amp 21 year ago and it always had this mistake. Now it works perfect. Lets go for another 21 years. Philipp

 

[Rolfsaudio]

I just fixed my Denon PMA 2000IVR! I found it even easier than the PMA980R, still i would like to order a new inputselector part, the tiny metal thing with the 4 toe's on it, or maybe i should change the whole print/selector? Where can i get it? (I speak Dutch, English, German)

 

[Andy H]

Thanks, I have a Denon PMA-735R which has had the intermittent source switching for a while. I didn't need to use a soldering iron to remove the metal cap on the source selection switch, just pliers, and cleaned the contacts with IPA on cotton buds. The only problem was once the metal cap was replaced, the lugs that hold it to the brown plastic were too short to spread to hold it properly.
As a means of holding it together, I've bodged it with hot glue, and will see how successful that is!

 

[MeisterLenny]

Thanks a lot. Just fixed my speaker selector of my Denon PMA-860 with your guide. Works just fine!

 

[sameerv]

superkris, thanks for this precise information I was able to fix my denon 1050 PMA. I was on the verge of going to replace my denon as the input switching was becoming an irritant. Appreciate all your efforts for documenting every step images.

 

[sameerv]

thanks for this detailed guide, i was able to fix the input selector switch jumping. And you were right the contact points below the green disc had gone really bad. I used a zero grain polish paper to get rid of the dirt and viola everything is perfect now.

 

[tmorin]

I had the problem for years and hadn't identified a fix, until I found this page.
I followed the steps and fixed the jumping selector issue on my Denon PMA 655 R.

There was a slight difference in how the button axle is fixed on the board, so there was no unsoldering involved.
It is indeed a bit hard to bend the metal at step 11, but not that hard.

I have done this 3 month ago, and the selector has been working completely smoothly since.

Thank you very much !!

 

[jowkon]

Thank you for all this info Which one would be better for this job:
Cleaner and lubricant https://www.amazon.co.uk/gp/product...act_title_1?ie=UTF8&psc=1&smid=A1JJQP12L4S11L
or
Cleaner only https://www.amazon.co.uk/gp/product...sfl_title_3?ie=UTF8&psc=1&smid=A3P5ROKL5A1OLE
?

 

[benno12345]

Thanks superKris!! I fixed the issue with my old Kenwood KA 5090R - they used exactly the same switch at the time. Removing/Unsoldering the switch from the PCB helped a lot when trying to open it.

@jowkon: I would simply use isopropanol and some cotton buds:
https://www.amazon.co.uk/bottle-iso...=1491161860&sr=1-2&keywords=isopropyl+alcohol

 

[drop]

Thanks for the help, just now fixed a Denon PMA-2000R!

It was pretty simple to get the input selector switch out, which has its own little PCB.

Just take the case cover off.

Take out 8 screws holding the front panel on.

Also the ground strap screw.

Remove the Input selector switch's knob and retaining nut.

Tilt the front panel down and carfully reach in and pop the ISS board out from the 4 plastic hold downs.

Then you can undo the single wire harness going to it. Did not have to tilt amp to the side.

There was no extra metal bracket on the switch so no soldering required.

Although if you could remove the LEDs it would be way, waaay easier to get the metal pins that need to be
squeezed together, to slide out of the brown board the switch sits on! Just on the one side though, small needle nose fit just fine for the other side.

It seemed as though there was a residue of oil, maybe dialectric grease, coating parts of the switch? I simple wiped everything down with Iso-
alcohol, put back together, problem solved

 

[Pavel_Kruk]

When you type PMA-980R on google you get a lot of hits about a problem with the input selector. Thats a shame, because its a real nice amp.

I hope you all find this post when you have problems with your own pma980r.

This is for when you input slector jumps inputs like crazy or maybe wont work at all. It has nothing to do with you relais going bad. Its just the wear on the switch.

Anyway, here is how you can fix it. Is very easy.

This is all you need.

- A solder iron + solder
- a screwdriver
- contact cleaner
- 30-60 minutes of time

Here we go!

Step 1:
- take the top of the denon.

Step 2:
- unscrew the ground from the front panel.

Step 3:
- Pull off the volume button.
- disconnect the volume button light

step 4:
- unscrew the black screws at the top of the front panal
- unscrew the black screws at the bottom of the front panal

Hi! I fixed selector of Denon PMA-655R with your recomendations. Everething mostly the same. If anybody needs, I can leave detail coment

 

[Mark Simons]

@SuperKris
Thanks for this great tutorial. Very clear and helpful!!
I've just used it to fix the output selector and it all went very fluidly!
The Denon belongs to a very dear friend of mine and he will test it the next couple of days.

Cheers

 

[fernarias]

The only thing that's missing from this repair is to add fader lube or gold tune to keep the contacts from fouling over the long hall. If you just clean it will foul again over time faster than if you sealed it.

 

[jowkon]

After long waiting I decide to fix my Denon PMA 1500 AE today. Unfortunately access to it is completely different and not easier as it should in newer model.
Anyone there did fix it successfully with one above??

 

[hptger]

Hello ,
your tutorial is very fine. Our Denon 735r input selector switch is working better than a new one
But when i opened the Amplifier i saw some kondensators with someting white at the bottom. The 735 is working without any problems for me. What did you think about the kondensators? Is that normal? See attached pictures.

 

[Ancelin]

Hi! I fixed selector of Denon PMA-655R with your recomendations. Everething mostly the same. If anybody needs, I can leave detail coment

Hello, I have a Denon PMA-655 R amp with the same problem ;
could you explain how extract the input selector behind the panel ?
Thanks in advance !

 

[Greg Linton]

Thanks for the help, just now fixed a Denon PMA-2000R!

It was pretty simple to get the input selector switch out, which has its own little PCB.

Just take the case cover off.

Take out 8 screws holding the front panel on.

Also the ground strap screw.

Remove the Input selector switch's knob and retaining nut.

Tilt the front panel down and carfully reach in and pop the ISS board out from the 4 plastic hold downs.

Then you can undo the single wire harness going to it. Did not have to tilt amp to the side.

There was no extra metal bracket on the switch so no soldering required.

Although if you could remove the LEDs it would be way, waaay easier to get the metal pins that need to be
squeezed together, to slide out of the brown board the switch sits on! Just on the one side though, small needle nose fit just fine for the other side.

It seemed as though there was a residue of oil, maybe dialectric grease, coating parts of the switch? I simple wiped everything down with Iso-
alcohol, put back together, problem solved

Hello. I have a PMA 2000 IVR. After gaining access and removing the PCB I saw that the switch cover was not easy to remove..I didn’t want to try and squeeze the two metal pins, but I saw that it was easy to pry up the cover with a jewelers screwdriver. There is a round metal wavy ring above it the applies the pressure. I just sprayed contact cleaner into the gap and turned the knob continually. Then i flushed with Iso alcohol. Followed up with Deoxit Gold - let it seep in and turned the knob. It worked fine afterwards. Time will tell for how long.