Yamaha P2200 DC offset - 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 12th December 2010, 12:20 AM   #1
diyAudio Member
 
Join Date: Oct 2009
Default Yamaha P2200 DC offset

I have that Yami for about two months and it works nicely. Nonetheless, I never could find the service manual for it. Just the owner manual, which gives no detail as how to set the DC offset.

Anyone has the instructions to set DC?

I have a multimeter and a small screwdriver ready to operate ;-)

TIA

Lee
  Reply With Quote
Old 12th December 2010, 08:38 PM   #2
diyAudio Member
 
Join Date: Nov 2010
Location: North Branford, CT
I have a PDF file of the service manual, but having trouble attaching it.
  Reply With Quote
Old 12th December 2010, 08:53 PM   #3
diyAudio Member
 
Join Date: Nov 2010
Location: North Branford, CT
Here is the link :

YAMAHA P-2200 SM Service Manual free download, schematics, eeprom, repair info for electronics

hope this works Lee.
  Reply With Quote
Old 12th December 2010, 10:47 PM   #4
diyAudio Member
 
Join Date: Oct 2009
Quote:
Originally Posted by motfinoski View Post
You bet it works. I downoalded it, and just to make sure I had a back-up copy, I emailed it to myself in my gmail account. I have been looking for that file for 3 months.

I am infinitely gratefull.

The P2200 is a gem of a power amp. Even for home use.
  Reply With Quote
Old 12th December 2010, 11:56 PM   #5
diyAudio Member
 
Join Date: Nov 2010
Location: North Branford, CT
GREAT, I hope you can correct/set the dc offset.
  Reply With Quote
Old 13th December 2010, 02:38 PM   #6
diyAudio Member
 
Join Date: Oct 2009
Picture somebody hitting his head on a concrete wall.

Started by adjusting the right channel. Probing pods were easy to locate, so was the potentiometer. I was at 16mV and adjusted to 10mV as per specs even though it could be set to 5mV.
Went to the left channel. Connected the voltmeter, started turning the pot, then my elbow slipped, the screwdriver touched the live wire next to the potentiometer and then a simple DC offset adjustment turned into the Fourth of July. Sparks, flames, fumes. I pulled the plug immediately but damages were done. One dead channel. I slid the driver/transistor board and it is badly burned. That side is definitely toast.

Anyone has a left channel DC board for sale? I deeply apologize for being such a low life fucktard. ;-(

Click the image to open in full size.

Last edited by Lee in Montreal; 13th December 2010 at 02:58 PM.
  Reply With Quote
Old 13th December 2010, 02:46 PM   #7
Banned
 
Join Date: Jan 2005
**** happens you know. I miswired both the output transistors and the driver transistors in my latest build, outputs survived, but drivers went up in smoke, replaced the drivers and rewired the outputs and it worked just fine afterwards.

Your board is likely repairable if you clean off the soot and charred remains, prollem is sourcing modern equavilents for the transistors used.

Atleast you have the right channel for reference for resistor values and such.
  Reply With Quote
Old 13th December 2010, 05:47 PM   #8
diyAudio Member
 
Join Date: Oct 2009
I did a cosmetical clean-up. No more charcoal. I flipped the boad to see if some races have burned. Everything seems to be okay. No fuse has popped either.

I will be checking R128 and 129, as well as TR110 (which is most likely damaged from the spike.
TR110 seems to be easily available. The service manual indicates 2SC1213A, C or D. Not specifically though.
  Reply With Quote
Old 6th January 2011, 05:36 PM   #9
diyAudio Member
 
Join Date: Oct 2009
Seeing that this side of the amp has probably been stressed now, maybe it's time to change the driver and output transistors (on both sides). While we are there, I also have another P2200 with various brands of transistors on it that could need some TLC ;-(

By experience, what would be the ideal transistors? Anything from ONsemi?

Don't worry, I now have another P2200 and a PC2002 to listen to while the wounded ones will be fixed.
  Reply With Quote
Old 16th August 2011, 05:17 PM   #10
diyAudio Member
 
Join Date: Aug 2011
Hello everyone
Please someone correct me if iam posting in a wrong way or violating the forum rules. I was searching where to post my issues but couldnt find the proper place to post. I found this thread which would match my issues.
I have p2200 amp with constant 80vdc on both channels. I checked and tested every single transistor, resistor, capacitor almost all the components on the PCB but couldnt find any faulty component.
I also checked the output transistors, the PNP and NPN but no luck, both 909 and 586 tested with positive result. Do you guys think that the output transistor would test good when you take it off the power amp, and it would do a shortcut when you put it back in. I am thinking to buy all the output transistors but i just dont waste my time if they are still in a good working condition.
I appreciate any possible help
  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
Yamaha P2200 service manual needed Jan Dupont Solid State 18 2nd March 2013 11:14 PM
Yamaha p2200 blowing fuses Pigpen1972 Solid State 6 2nd July 2010 01:31 PM
Screaming Yamaha P2200 Question HazenK Solid State 1 16th September 2008 04:59 PM
Yamaha, transistors capacitors, biasing p2200 priscared Solid State 17 14th July 2004 02:39 AM
Power Amplifiers Preamps Yamaha p2200 priscared Solid State 7 19th March 2004 11:57 AM


New To Site? Need Help?

All times are GMT. The time now is 09:59 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