IBM 6550-63N - Board and Picture Tube Removal

6550-23N/23S/33N/63N/63S/73N
2-2. A AND D BOARDS REMOVAL
2-3. SERVICE POSITION
2-2
1
Screw
(+BVTT 3 x 8)
CN601
GND
GND
6
Three screws
(+BVTT 3 x 12)
7
Four screws
(Washer head +P 3 x 8)
2
Cable stopper
5
A board
8
D board
3
Cable cover
4
Cable holder
1
2
A board
D board
3
(Note) The electric potential of heat sink of IC401 is not GND.
So please do not touch it absolutely to the base chassis
and etc., which make an ultimate cause of the bad move-
ment or break.