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 4th May 2012, 11:59 AM   #1
KevinAB is offline KevinAB  United Kingdom
diyAudio Member
 
Join Date: Apr 2012
Red face Schematic for Marantz PM55-SE

Hi can anyone point me in the right direction.
My recent purchase off Ebay, a Marantz PM55-SE amplifier, seems to have been used as a football by the Post Office.
The facias is caved in and when I went to switch it on it started smoking and glowing!
I know absolutely nothing about electronics but thought attempting a repair would be a good place to begin learning. The amplifier didn't cost a lot.
I guess the first thing I need is a schematic - not that I understand how to read them but you have to start somewhere!
  Reply With Quote
Old 4th May 2012, 12:29 PM   #2
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, on the east coast
A schematic is sure a good idea for repairing but have you assessed the internal damage?
If the circuit boards are cracked or leads and copper foil torn, controls broken, power supply
damaged etc. you need to think what expertise will be needed to fix a mess like that.
You may have to cut your losses and consider becoming a DIY builder rather than fixit.
__________________
regards
  Reply With Quote
Old 4th May 2012, 01:03 PM   #3
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, on the east coast
Sorry Kevin AB, I should have added that you can download PM55 manuals for free at HiFiengine. Google it and you can search easily.
__________________
regards

Last edited by Ian Finch; 4th May 2012 at 01:08 PM.
  Reply With Quote
Old 4th May 2012, 01:30 PM   #4
KevinAB is offline KevinAB  United Kingdom
diyAudio Member
 
Join Date: Apr 2012
Quote:
Originally Posted by Ian Finch View Post
A schematic is sure a good idea for repairing but have you assessed the internal damage?
If the circuit boards are cracked or leads and copper foil torn, controls broken, power supply
damaged etc. you need to think what expertise will be needed to fix a mess like that.
You may have to cut your losses and consider becoming a DIY builder rather than fixit.
Thanks for the quick reply. Apart from the cracked facia panel, there doesn't appear to be any immediate signs of damage - at least to my untrained eye! I have no doubt that I've probably set myself a task which is going to prove to be way beyond my understanding and capabilities. I need an idiots guide to electronics

I've just swapped over the fuse and turned it on with the cover off. There's a componet which glows. Right now I do not have a clue what it's called or what it's meant to do! It's white, about 1" x 1/2" (no idea what that is in metric) and has an inscription 3w 0.80R x 2 (that may not be correct as my eyesight ain't what it used to be either ) but there is an identical one on the other side of the board.

Thanks for the link to the schematic. I'll have a shufty now and see what sense if any I can make of it.
  Reply With Quote
Old 4th May 2012, 06:03 PM   #5
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, on the east coast
Beware the model is not PM55 SE. There will be differences. It seems from posts that the SE version service manual is not freely available.

I cannot locate the power resistors you described. Can you read the part number or its twin part number from the print on the board? If these do not match anything, then the manual may be near to useless for you.
__________________
regards
  Reply With Quote
Old 4th May 2012, 06:22 PM   #6
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
I haven't got the schematics but power resistors are usually around the output transistors or power supply.

This could be a MAJOR learning experience for a newbie.
  Reply With Quote
Old 4th May 2012, 06:47 PM   #7
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Quote:
Originally Posted by Ian Finch View Post
Beware the model is not PM55 SE. There will be differences. It seems from posts that the SE version service manual is not freely available.

I cannot locate the power resistors you described. Can you read the part number or its twin part number from the print on the board? If these do not match anything, then the manual may be near to useless for you.
How much difference is there between the PM55 and the PM55-SE ?

I would have thought that they would be similar enough for an experienced engineer to work between the two.

Philips always used to promote the Marantx SE's as just Special Editions, then there were the SE Gold versions.
  Reply With Quote
Old 4th May 2012, 06:58 PM   #8
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
If it was working and now its been physically damaged, I would certainly suspect the solder joints around the amp.

Do a search on DRY-JOINTS to get an idea of what you should be looking for. Unlikely that you will have dry joints but you will almopst certainly have broken joints.
  Reply With Quote
Old 4th May 2012, 07:21 PM   #9
sasha70 is offline sasha70  United Kingdom
diyAudio Member
 
Join Date: Jul 2011
Location: Newtownards
Hi, send it back and ask seller to claim damage from the Post Office, hope he has paid insurance. I have done same with damaged speakers I have bought on e-bay on the past.
Regards.
  Reply With Quote
Old 4th May 2012, 07:53 PM   #10
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
I did the same with an Oscillocope. Royal Mail eventually replaced a 'scope that they ruined in the post. It all depends on the Insurance that you paid.
  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 pm55 problem piewie Solid State 10 9th May 2012 08:48 PM
Marantz 63 to SE j baldam Digital Source 2 5th October 2011 08:18 PM
Bringing Marantz PM55 up to SE spec harrygrey382 Solid State 3 16th June 2007 06:39 PM
se 6c33c or se el34 schematic karma Tubes / Valves 10 2nd July 2005 05:40 PM
Marantz 67 SE schematic Grip Digital Source 17 30th January 2004 08:23 PM


New To Site? Need Help?

All times are GMT. The time now is 04:01 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