HELP!! Denon PMA-655R (source selector) - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th October 2012, 02:05 PM   #1
diyAudio Member
 
Karl vd Berg's Avatar
 
Join Date: Jul 2012
Location: South side of the Sky
Default HELP!! Denon PMA-655R (source selector)

Hi folks!

I have a problem with my Denon PMA-655R amplifier. The source input selector starts to "jump" or shift by itself suddenly. It's really annoying when listening to the Tuner and then it goes to the CD or to the Tape 1.

Any Denon user knows or had experienced this before?? How to solve this?

Many thanks in advance!
Attached Images
File Type: jpg denon_pma655r_detail.jpg (95.1 KB, 49 views)
File Type: jpeg denon_pma655r.jpeg (540.5 KB, 46 views)
  Reply With Quote
Old 16th October 2012, 03:05 PM   #2
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
walk in the park

The selector switch ""drives"" a micro processor or some IC to select the input .
Either the selector switch is dirty/warn but a more common failure for this type of switch is that the grease that existed inside the switch is so dry that the switch loose contact resulting jumping to another source or other type of failure .

You need to clean the grease from inside and apply new but not that much .

Do not try to spray the switch it will have no effect ...sorry to say but there might also be a need to totally disassemble the switch to clean it properly. ( very possible to do )

Kind regards
sakis
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 16th October 2012, 11:49 PM   #3
diyAudio Member
 
Karl vd Berg's Avatar
 
Join Date: Jul 2012
Location: South side of the Sky
Quote:
Originally Posted by sakis View Post
walk in the park

The selector switch ""drives"" a micro processor or some IC to select the input .
Either the selector switch is dirty/warn but a more common failure for this type of switch is that the grease that existed inside the switch is so dry that the switch loose contact resulting jumping to another source or other type of failure .

You need to clean the grease from inside and apply new but not that much .

Do not try to spray the switch it will have no effect ...sorry to say but there might also be a need to totally disassemble the switch to clean it properly. ( very possible to do )

Kind regards
sakis
Many thanks!!

After read your comment I opened the amplifier tonight and, although it was a nightmare to reach the selector switch, I was able to cleaned it. Now the problem seems to be fixed!

I though it could be the relay on the main board and I didn't want to fix it (the relay) cause this amp is quite difficult to work on.

Unfortunately it seems to affect quite few Denon amps. Someone had this same problem with the PMA-2000R. I love Denon amps but I became suspicious now with this weak part of them.

But, anyway: again, many thanks!
  Reply With Quote
Old 17th October 2012, 12:01 AM   #4
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
no probs ..The dutch are always welcome !!!
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Denon PMA-S10 II input selector shifting by it self? Westergaard Solid State 1 19th December 2010 10:03 PM
Denon PMA-777 horias2000 Solid State 0 12th October 2010 08:42 AM
Denon PMA-250 edl Solid State 3 6th November 2006 12:59 PM
Denon PMA-2000 Skorpio Solid State 3 14th February 2005 01:48 PM
Denon Pma-860 ManUtd Solid State 4 11th January 2005 09:14 PM


New To Site? Need Help?

All times are GMT. The time now is 07:41 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2