Yamaha P2200 DC offset

Lee in Montreal · 12th December 2010, 12:20 AM

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

motfinoski · 12th December 2010, 08:38 PM

I have a PDF file of the service manual, but having trouble attaching it.

motfinoski · 12th December 2010, 08:53 PM

Here is the link :

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

hope this works Lee.

Lee in Montreal · 12th December 2010, 10:47 PM

Quote:

Originally Posted by motfinoski

Here is the link :

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

hope this works Lee.

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.

motfinoski · 12th December 2010, 11:56 PM

GREAT, I hope you can correct/set the dc offset.

Lee in Montreal · 02:58 PM

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. ;-(

Tekko · 13th December 2010, 02:46 PM

**** 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.

Lee in Montreal · 13th December 2010, 05:47 PM

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.

Lee in Montreal · 6th January 2011, 05:36 PM

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.

skybar8 · 16th August 2011, 05:17 PM

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

12th December 2010, 12:20 AM	#1
Lee in Montreal diyAudio Member Join Date: Oct 2009	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

13th December 2010, 02:38 PM	#6
Lee in Montreal 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. ;-( Last edited by Lee in Montreal; 13th December 2010 at 02:58 PM.

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12th December 2010, 08:38 PM	#2
motfinoski diyAudio Member Join Date: Nov 2010 Location: North Branford, CT	I have a PDF file of the service manual, but having trouble attaching it.

12th December 2010, 08:53 PM	#3
motfinoski 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.

12th December 2010, 11:56 PM	#5
motfinoski diyAudio Member Join Date: Nov 2010 Location: North Branford, CT	GREAT, I hope you can correct/set the dc offset.

13th December 2010, 02:46 PM	#7
Tekko diyAudio Member 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.

13th December 2010, 05:47 PM	#8
Lee in Montreal 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.

6th January 2011, 05:36 PM	#9
Lee in Montreal 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.

16th August 2011, 05:17 PM	#10
skybar8 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