NAD 2200 PE schematics

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Does anyone have the schematics (with printlayout ?) of the NAD 2200 PE power amp.

I have got one wich seams to produce about 3,5 Volt of DC on the output of both channels !!?? . Anyone familiar with this problem ? Realy want to cure it to use it as a subwoofer-amp.

Does anyone know what the input impedance of NAD 2200 amp is ? Would like to know because I want to use a passive crossover in front of it at line-level.
 
Tried to adjust the offset with the mentioned pot's. Nothing happens, offset is still the same. Strange thing is that it is on both channels so I suppose something else is wrong here.

Tried to get the service manual, but noone seem to have it, even NAD itself do not carry them anymore.

HEEEEELP. !!!!
 
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