Thanks, Chadtower and Havok for the info.
The manual you point to Havok I have too. But unfortunatly the manual is only for an upright cab.
Chadtower, thanks for the info too, but I've tried the sites too, and all other sites and search engins I could find.
The cab I have is a delux which moves left and right.
Here is a picture.

Idealy, anyone wiht a cabinet like mine, but who has the service manual (with the schematics) I would like to hear from them.
This help would be great as I wish to sell the unit, but before I do I wish to fix the board.
Thanks,
Dariusz