X-5 shorted center channel

ROLIKOV · 30th October 2008, 10:01 PM

Hi
I have the X-5 five channels amp. which is awesome ,
But unfortunately , today i made a stupid mistake , i made a short circuit to the center channel , and now the sound is hoarse .
I have the service manual ,
Need some advise of how repair this baby ,
I am going to start check the 4 pairs of Mosfets of the center channel , and i will be happy to receive some tips

Thanks
ROLI

h_a · 31st October 2008, 07:58 AM

I assume you shorted while playing music, right? Without signal not much should happen.

Check as you already said the output fets, by testing bias currents and such.

Be aware that the service manual does not state the correct voltage across the source resistors; in fact biasing is not exactly known for the X5. You could contact Nelson for that.

As the X5 has a common toroid and no regulation for the output stage I guess only the output fets should be affected.

Have fun, Hannes

Nelson Pass · 31st October 2008, 06:39 PM

Most of the time you need to replace the Mosfets, the Source resistors, and
the zener protection diodes in any pair where one or the two are damaged.

30th October 2008, 10:01 PM	#1
ROLIKOV diyAudio Member Join Date: May 2007	X-5 shorted center channel Hi I have the X-5 five channels amp. which is awesome , But unfortunately , today i made a stupid mistake , i made a short circuit to the center channel , and now the sound is hoarse . I have the service manual , Need some advise of how repair this baby , I am going to start check the 4 pairs of Mosfets of the center channel , and i will be happy to receive some tips Thanks ROLI

31st October 2008, 07:58 AM	#2
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	I assume you shorted while playing music, right? Without signal not much should happen. Check as you already said the output fets, by testing bias currents and such. Be aware that the service manual does not state the correct voltage across the source resistors; in fact biasing is not exactly known for the X5. You could contact Nelson for that. As the X5 has a common toroid and no regulation for the output stage I guess only the output fets should be affected. Have fun, Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

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31st October 2008, 06:39 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Most of the time you need to replace the Mosfets, the Source resistors, and the zener protection diodes in any pair where one or the two are damaged.

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