Issue with Marantz PM 66KI - 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 3rd December 2013, 10:28 AM   #1
diyAudio Member
 
Join Date: Nov 2010
Location: UK
Default Issue with Marantz PM 66KI

My Marantz PM66KI has been working totally fine until today

Hooked up a different pair of speakers (Missiom 760ise) and turned the amplifier on

All was working finem, turned the volume up a little more, then total silence, nothing.

Power light still on, remote works the volume control just fine

Switched off and back on again, however, the usual relay click (out of protection mode?) doesn't happen

Is it pure coincidence the amplifier expired when I got new speakers ?
  Reply With Quote
Old 3rd December 2013, 12:24 PM   #2
diyAudio Member
 
dragonweed's Avatar
 
Join Date: Sep 2010
Location: Hungary
Yes, I've experienced similar mishaps when I worked as a service technician... Most likely what happens is that a different "new" speaker with different load and current demand on certain parts of the freq. spectrum put a stress on some parts, that were comfortable with your old speakers. If your protection relay does not "clicks" on, that usually indicates a fault in your output stage. Check your supply voltages, output DC level (before the relay), power transistors for shorts, driver transistors, emitter resistors, etc., most likely they are the culprit.
  Reply With Quote
Old 3rd December 2013, 12:42 PM   #3
diyAudio Member
 
Join Date: Nov 2010
Location: UK
Thank you for the reply

My amplifier is going off for repair as anything above changing a plug or fuse is beyond me

I think the amplifier is far too good to consign to the bin, so hopefully a repair will be money well spent
  Reply With Quote
Old 3rd December 2013, 01:21 PM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
I don't believe in coincidences

Make certain you have no strands of speaker wire shorting, either at the amp or speaker. Something to watch for again.

You would have to really abuse the amp to zap the output stage just by normal domestic listening... so its a bit strange what has happened.
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 3rd December 2013, 01:25 PM   #5
diyAudio Member
 
Join Date: Nov 2010
Location: UK
The speaker cables use banana plugs all round, so that's unlikely to be a short caused by them, especially as I connected everything up when the amplifier was powered off
  Reply With Quote
Old 3rd December 2013, 01:30 PM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Very strange then...

If you have a meter then it has to be worth at least lifting the lid and seeing if it really has gone pop
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 4th December 2013, 12:06 AM   #7
diyAudio Member
 
Join Date: Feb 2007
Location: Near Buffalo NY USA
I'd put the ohm meter on the speakers. Maybe the speakers have a shorted voice coil...
__________________
The stuff you don't know always humbles us.........
  Reply With Quote
Old 4th December 2013, 05:51 AM   #8
diyAudio Member
 
Join Date: Nov 2010
Location: UK
The guy who is repairing my amplifier is going to put a meter on my speakers at the same time, as it would be somewhat annoying to get the amplifier repaired and have the same thing happen as soon as I got home !

Thanks for all the replies
  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
Marantz PM-94 StuartMoore Solid State 21 23rd February 2011 08:33 PM
Marantz PM 440 and PM 351 Schematic required Krokotam_ Solid State 0 22nd October 2008 07:36 AM
Marantz PM-11S1 Ipanema Solid State 2 31st July 2008 02:37 PM
marantz PM-66SE kinvig Solid State 2 2nd April 2008 11:46 PM
Marantz PM 94 Help brams Solid State 6 27th February 2006 06:23 AM


New To Site? Need Help?

All times are GMT. The time now is 08:27 PM.


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