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Old 30th October 2008, 10:01 PM   #1
ROLIKOV is offline ROLIKOV  Israel
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Join Date: May 2007
Default X-5 shorted center channel

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

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Old 31st October 2008, 07:58 AM   #2
h_a is offline h_a  Europe
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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
High Octane phono preamp Wiki
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Old 31st October 2008, 06:39 PM   #3
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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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