Yamaha PSR-S750 Service Manual page 18

PSR-S750/PSR-S950
15. PNL Circuit Board
(Time required: About 5 minutes)
15-1. Remove the lower case assembly. (See procedure 2.)
15-2. Remove the keyboard assembly. (See procedure 14.)
15-3. Remove the ten (10) screws marked [500C]. The PNL
circuit board can then be removed. (Fig. 12)
* When installing the PNL circuit board, tighten the
screws z and x shown in Fig. 12 in numerical order
and then tighten the other screws.
16. PNC Circuit Board
(Time required: About 5 minutes)
16-1. Remove the lower case assembly. (See procedure 2.)
16-2. Remove the keyboard assembly. (See procedure 14.)
16-3. Remove the ten (10) screws marked [500D]. The PNC
circuit board can then be removed. (Fig. 12)
* When installing the PNC circuit board, tighten the
screws z and x shown in Fig. 12 in numerical order
and then tighten the other screws.
Projection [A] x 8
z
[500E] x 9
18
30°–40°
x z
[500D] x 10
Fig. 12
17. PNR Circuit Board
(Time required: About 5 minutes)
17-1. Remove the lower case assembly. (See procedure 2.)
17-2. Remove the keyboard assembly. (See procedure 14.)
17-3. Remove the nine (9) screws marked [500E]. The PNR
circuit board can then be removed. (Fig. 12)
* When installing the PNR circuit board, tighten the
screws z and x shown in Fig. 12 in numerical order
and then tighten the other screws.
* Only the two (2) projections of the
left speaker grille must be bent in
the counterclockwise direction.
Other projections can be bent in
any direction.
z
x
[500C] x 10
Projection [A] x 8
x
PB
MOD