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 18 (click to view)
6-2. DT-9000 M30/50/90
1 . To remove main and sub batteries
Slide the open lever in the direction of the arrow and open the battery pack cover then remove the main battery. 2 . To remove main battery cover
Remove two a screws and extract the primary and secondary batteries.
As shown in the right figure, push the corner of the battery pack cover to disengage from the ditch and remove the battery pack cover.
3 . Removing the lower case Remove seven b screws. Push part c of the case to unlock a hook, Lower case is then be able to be removed.
