Yamaha PORTATONE PSR-9000 Service Manual page 10

PSR-9000
3 AMP Circuit board
3-1 Remove the lower case. (See procedure 1.)
3-2 Remove the power supply unit. (See procedure 2.)
3-3 Remove the two (2) screws marked [50a]. The power
supply cover can then be removed. (Fig. 3)
3-4 Remove the eight (8) screws marked [50b]. The AMP
circuit board can then be removed. (Fig. 3)
Power supply cover(upper)
[50a]
5 LCD Assembly
5-1 Remove the lower case. (See procedure 1.)
5-2 Remove the power supply unit. (See procedure 2.)
5-3 Remove the four (4) screws marked [70a]. The LCD
assembly can then be removed. (Fig. 4)
Upper case
10
AMP
Power supply cover(lower)
Power supply unit
[50]: Bind Head Tapping Screw-B 3.0X6 MFZN2Y (EP600130)
(Fig. 3)
[70a] x 4
[70]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
(Fig. 4)
4 FU Circuit Board
4-1 Remove the lower case. (See procedure 1.)
4-2 Remove the power supply unit. (See procedure 2.)
4-3 Remove the power supply cover. (See procedure 3-3.)
4-4 Remove the four (4) screws marked [50c]. The FU
circuit board can then be removed. (Fig. 4)
[50b] x 8
Power transformer
6 INV Circuit Board
6-1 Remove the lower case. (See procedure 1.)
6-2 Remove the power supply unit. (See procedure 2.)
6-3 Remove the four (4) screws marked [70b] and INV
cover. The INV circuit board can then be removed.
(Fig. 4)
LCD assembly
Power supply unit
FU
[50c] x 4
Power supply cover(upper)
INV
INV cover
[70b] x 4