Yamaha PSR-S750 Service Manual page 17

11. PNS Circuit Board
(Time required: About 9 minutes)
11-1. Remove the lower case assembly. (See procedure 2.)
11-2. Remove the center panel assembly. (See procedure 8.)
11-3. Remove the FFC_S wiring assembly.
(Fig. 7, Fig. 8)
11-4. Remove the nineteen (19) screws marked [300D].
The PNS circuit board can then be removed. (Fig. 11)
* When installing the PNS circuit board, fi t the PNS
circuit board to the positioning pins at 2 locations
shown in Fig. 11 fi rst, tighten the screws z and x in
that order and then tighten the other screws.
12. PNM Circuit Board (PSR-S750)
(Time required: About 10 minutes)
12-1. Remove the lower case assembly. (See procedure 2.)
12-2. Remove the center panel assembly. (See procedure 8.)
12-3. Remove the FFC_S wiring assembly. (Fig. 7)
12-4. Remove the LCD assembly. (See procedure 9-4.)
12-5. Remove the twenty-seven (27) screws marked [300E].
The PNM circuit board can then be removed. (Fig. 11)
* When installing the PNM circuit board, apply the PNM
circuit board to the positioning marks at 3 locations
shown in Fig. 11 fi rst, tighten the screws z and x in
that order and then tighten the other screws.
Positioning pin (fit to circuit board)
[300D] x 19
x
PNS
x
z
Positioning pin (fit to circuit board)
13. PNM Circuit Board (PSR-S950)
(Time required: About 10 minutes)
13-1. Remove the lower case assembly. (See procedure 2.)
13-2. Remove the center panel assembly. (See procedure 8.)
13-3. Remove the FFC_S wiring assembly. (Fig. 8)
13-4. Remove the LCD fi xture L. (See procedure 10-4.)
13-5. Remove the LCD fi xture R. (See procedure 10-5.)
13-6. Remove the twenty-seven (27) screws marked [300E].
The PNM circuit board can then be removed. (Fig. 11)
* When installing the PNM circuit board, apply the PNM
circuit board to the positioning marks at 3 locations
shown in Fig. 11 fi rst, tighten the screws z and x in
that order and then tighten the other screws.
14. Keyboard Assembly
(Time required: About 4 minutes)
14-1. Remove the lower case assembly. (See procedure 2.)
14-2. Remove the screw marked [420B]. The keyboard
assembly can then be removed. (Fig. 4)
Positioning mark (applied to circuit board)
PNM
Fig. 11
PSR-S750/PSR-S950
z
[300E] x 27
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