Marantz PM66KI amp. - Page 3 - 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 4th January 2006, 11:42 AM   #21
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
I have rebuilt many output stages on these amps.

Change Q764 Q762 Q752 Q754 Q758 Q756 Q760 QN02 QN03 (or equivalent on other side). Change them all as said previously its not worth it going bang again.

Once rebuilt set volume to minimum , balance to center position , set the bias VR to center position (R756 or R755).

Set your digital (not analogue) multimeter to mV and connect to the two outer test points of the output resistor (R767 or R768).

Now switch power on.... Hopefully nothing has gone bang!!!!

Adjust the VR to 14 mV as follows......

Elapsed Power on idle current setting
-------------------------------------------------------
30 sec to 1 min 5mV
1 min to 2 min 8mV
2 min to 4 min 10.5mV
More than 6 mins 14mV

If after this time period the mV will not stay stable then there is another problem and you run the risk of it going bang again.

Changing all the above components should be fine though.

The capacitors used in the KI are Elna 'FOR AUDIO' 56V 12000uF.

The regulators Q801 and Q802 do get hot, they supply the protection, relay and volume circuits.

I fitted mine to the heatsink. Remove them, clean the pcb with a fiber pen and resolder, put new ones in on longer legs too.

Hope this helps
  Reply With Quote
Old 4th January 2006, 02:25 PM   #22
toman_9 is offline toman_9  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: ...
Thanks al a lot for the help so far...

This means I have to order new transistors, I hope I can find them all. I shall update you guys once I change them.

Please use toman9 at googlemail.com for the pdfs.

Tim
  Reply With Quote
Old 4th January 2006, 02:49 PM   #23
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
All the components used are common items so you will be ok.

Try these...

http://www.electronicsrepair.net/scemes.html

I find them very good and efficient.

EDIT:- Just noticed they don't have the Schematics for this model. lol.

I will try to copy mine once my scanner is repaired
  Reply With Quote
Old 4th January 2006, 04:08 PM   #24
toman_9 is offline toman_9  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: ...
Hi Hugo,

You have suggested to desolder the output stage transistors.
If I do that, is it OK to turn on the amp to see whether other parts are working ? I have in mind to check the regulators for example to see whether to supply the correct voltage.

Hi Rowemeister,

Ok I will order all the transistors you named.
Anything else you think necessary ?

BTW The SI E model also have the same ELNA capacitors. I do not think they are broken, but if...
Does someone know where to order them I can not seem to find any...
  Reply With Quote
Old 4th January 2006, 07:48 PM   #25
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
The idea behind it is that, if they still work, you surely save them from frying while testing.
It is perfectly possible to turn on the amplifier without output stage to perform most DC measurements.

/Hugo
  Reply With Quote
Old 5th January 2006, 07:45 AM   #26
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
Everything listed should cure your problem.

And yes you can power up without the output in. Also you can run the channel that appears ok and test the audio from it.

You may also be better getting hold of a pair of better quality caps but this may be too expensive.
  Reply With Quote
Old 5th January 2006, 02:53 PM   #27
toman_9 is offline toman_9  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: ...
Quote:
Originally posted by rowemeister

The regulators Q801 and Q802 do get hot, they supply the protection, relay and volume circuits.

I fitted mine to the heatsink. Remove them, clean the pcb with a fiber pen and resolder, put new ones in on longer legs too.



So do you place them on the big heat sinks and wired them to the PCB ?
Or added small heatsinks to those transistors.

If this help I might try it also, do you have a photo ?
  Reply With Quote
Old 5th January 2006, 03:19 PM   #28
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
I fitted mine to the main heat sink and wired them.

I'll look for a pic
  Reply With Quote
Old 5th January 2006, 07:44 PM   #29
toman_9 is offline toman_9  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: ...
Grrrrr......

I have ordered 2SC9141 instead of 2SA1941....and recieved them... Very annoying...
Have to order them once again...

Thanks Hugo!
I have received the KI spec, there is list of parts that are different.
Any idea what "Blue SE" caps are ?
  Reply With Quote
Old 5th January 2006, 08:05 PM   #30
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Default Blue SE

Not really; are they listed in the manual?

Thanks for the mail.

/Hugo
  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
PM66KI gone pop Murphster Solid State 0 7th July 2009 11:19 AM
Marantz Cd 67 bull041161 Digital Source 4 13th April 2009 09:39 PM
Whats a Marantz PM66KI Toroidal TX worth? Fidelity Audio Swap Meet 0 15th December 2005 12:02 PM
Right speakers for Marantz PM8000 + Marantz CD67-OSE? betto80 Multi-Way 2 24th May 2005 03:21 PM
Link Between Marantz CD12 and Marantz CD99 Mesh Digital Source 16 7th November 2003 06:08 PM


New To Site? Need Help?

All times are GMT. The time now is 02:03 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