This document is just what I was looking for, it´s very useful, it contains adjustment procedures for the final stage of the power amp and also
has a complete wiring diagram and description of the main semiconductors used in the design.
Text excerpt from page 6 (click to view)
XM-460GTX SECTION 2 DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
SET 2-1. BOTTOM PLATE (Page 6) MAIN BOARD SECTION (Page 7)
2-2.
2-3.
MAIN BOARD, HI-LEVEL BOARD (Page 7)
2-4.
LED BOARD (Page 8)
Note : Follow the disassembly procedure in the numerical order given.