Yamaha Disklvaier Mark II XG Series Service Manual page 18

MX100IIXG
18 CT IN UP Circuit Board
18-1 Remove the switch box. (See procedure 17)
18-2 Remove the hexagonal nut for the foot control
jack; remove the CT IN UP circuit board. (Fig. 9
and Fig. 10)
19 Power Supply Unit
19-1 Remove the lower front board.
19-2 Remove the two (2) screws marked [101S];
remove the power supply unit. (Fig. 11)
19
(Fig. 9 )
(Fig.10)
(Fig.11)