Yamaha PORTATONE PSR-270 Service Manual page 7

1 Lower Case Assembly
1-1 Remove the battery cover assembly. (Fig. 1)
1-2 Remove the fourteen (14) screws marked [330] and
the two (2) screws marked [340]. The lower case
assembly can then be removed.
2 DM Circuit Board
2-1 Remove the lower case assembly. (See Procedure 1.)
2-2 Remove the four (4) screws marked [330]. The DM
circuit board with the shield box can then be re-
moved. (Fig. 2)
2-3 Remove the ten (10) screws marked [310]. The DM
circuit board can then be removed. (Fig. 2)
[330]: Bind Head Tapping Screw-P 3.0X12 MFZN2Y (EP600300)
[340]: Bind Head Tapping Screw-P 3.0X25 MFZN2Y (VK228100)
(Fig.1)
3 INV Circuit Board
3-1 Remove the lower case assembly. (See Procedure 1.)
3-3 Remove the two (2) screws marked [320]. The INV
circuit board can then be removed. (Fig. 2)
4 Keyboard Assembly
4-1 Remove the lower case assembly. (See Procedure 1.)
4-2 Remove the three (3) screws marked [340]. The
keyboard assembly can then be removed. (Fig. 2)
PSR-270
7