Schematics for an opti2000d driver module

Hi, I'm in trouble with the repair of an amplifier, the third in a series of 8.
It is a Lanzar OPTI2000D, I was able to check that all the amplifier is intact, except for the driver module, in fact, I replaced the driver module with that of another opti2000d and the amplifier works perfectly.
I would like to repair the faulty driver module.
Who could help me? maybe someone has the schematic form of this driver ....
thanks to all