need scmh. for europower pmh660m

stan cooper · 14th May 2009, 07:29 PM

cannot find the parts:
trf9640
dsld20u
irf640n
please help
thank you, stan

Cal Weldon · 14th May 2009, 07:31 PM

Moved to Solid State. Troubleshooting is for problems with the site.

Enzo · 15th May 2009, 06:02 AM

IRF640 and IRF9640 are common MOSFETs and are available at Mouser and many other suppliers. They come in a variety of package styles, so make sure you are selecting the package you need - I think yours would be using TO220. They are in stock for 88 cents and $1.30 respectively.

LD20U is just an ultrafast diode, also in stock at Mouser for $1.47.

www.mouser.com

Try removing the bad transistors then rechecking those diodes. SInce they are in parallel with the transistors, a shorted transistor will make the diode look shorted even when it is not. I have never seen one of those diodes shorted in these units.

stan cooper · 16th May 2009, 07:08 AM

THANKS,ENZO
IN THIS DAY AND AGE IT IS NICE TO KNOW THAT THERE
ARE PEOPLE LIKE YOU, WHO ARE CONCERNED FOR OTHERS.
I HAD ALREADY ORDERED THE IRF640 AND THE IRF9640.
BUT I WAS HAVING TROUBLE WITH THE PART NUMBER.FOR THE
DUAL DIODE.
THANKS AGAIN AND IF I CAN HELP YOU WITH ANYTHING ,
JUST LET ME KNOW.
I SORT OF LIKE THIS LITTLE NET (FORUM) I THOUGHT THAT
I WAS THE ONLY ONE HAVING PROBLEMS GETTING SCHM. AND
PARTS FOR THESE NEW AMPS AND MIXERS THAT ARE COMING OUT.

STAN

Enzo · 16th May 2009, 01:38 PM

Stan, Behringer in particular is a very uptight company. I am one of their service centers, and we all have to sign a non-disclosure agreement stating that we will not share any of their technical documentation. That is why it is hard to find their schematics. We are free to answer questions such as yours though.

HAve you removed the old shorted IRF640s and checked the diodes? They really are not under any stress, even if the transistors short.

14th May 2009, 07:29 PM	#1
stan cooper diyAudio Member Join Date: May 2009	need scmh. for europower pmh660m cannot find the parts: trf9640 dsld20u irf640n please help thank you, stan

14th May 2009, 07:31 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Moved to Solid State. Troubleshooting is for problems with the site. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

16th May 2009, 07:08 AM	#4
stan cooper diyAudio Member Join Date: May 2009	ANSWER TO MY QUESTION THANKS,ENZO IN THIS DAY AND AGE IT IS NICE TO KNOW THAT THERE ARE PEOPLE LIKE YOU, WHO ARE CONCERNED FOR OTHERS. I HAD ALREADY ORDERED THE IRF640 AND THE IRF9640. BUT I WAS HAVING TROUBLE WITH THE PART NUMBER.FOR THE DUAL DIODE. THANKS AGAIN AND IF I CAN HELP YOU WITH ANYTHING , JUST LET ME KNOW. I SORT OF LIKE THIS LITTLE NET (FORUM) I THOUGHT THAT I WAS THE ONLY ONE HAVING PROBLEMS GETTING SCHM. AND PARTS FOR THESE NEW AMPS AND MIXERS THAT ARE COMING OUT. STAN

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15th May 2009, 06:02 AM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	IRF640 and IRF9640 are common MOSFETs and are available at Mouser and many other suppliers. They come in a variety of package styles, so make sure you are selecting the package you need - I think yours would be using TO220. They are in stock for 88 cents and $1.30 respectively. LD20U is just an ultrafast diode, also in stock at Mouser for $1.47. www.mouser.com Try removing the bad transistors then rechecking those diodes. SInce they are in parallel with the transistors, a shorted transistor will make the diode look shorted even when it is not. I have never seen one of those diodes shorted in these units.

16th May 2009, 01:38 PM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Stan, Behringer in particular is a very uptight company. I am one of their service centers, and we all have to sign a non-disclosure agreement stating that we will not share any of their technical documentation. That is why it is hard to find their schematics. We are free to answer questions such as yours though. HAve you removed the old shorted IRF640s and checked the diodes? They really are not under any stress, even if the transistors short.

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