Good scan of the original service manual. All schematics and adjustment procedures are there. It helped me to fix a long lasting problem with the tracking circuitry. The manual also includes the supplementals 1,2 and 3. Included are; electrical schematic's , pcb layout's, mechanical drawing's and exploded views, disassembly manual and maintenance procedures. 236 pages.
Attach four cushions to the base of the subwoofer, one at each corner. The cushions prevent the subwoofer from sliding, and dampen its vibrations.
WARNING
Due to the mains switch was located at the rear panel, the apparatus must be located in the open area without any obstructions to access the mains switch.
How to Replace Woofer Insert the scew driver to a gap between cabinet and grille assy from bottom side.