Yamaha Disklavier Silent Mark III Service Manual page 20

DU1A
A. PK-CTL Circuit Board
A-1 Remove the three (3) screws marked [15GA]. The PK-
CTL circuit board can then be removed. (Fig.8, Photo.9)
PK-CTL
[15GA]: Bind Head Tapping Screw-S 3.0X6 MFZN2Y (EP600410)
B. DRIVE A Circuit Board
B-1 Remove the three (3) screws marked [15GB]. The DRIVE
A circuit board can then be removed. (Fig.8, Photo.10)
∗
Both DRIVE A circuit boards are removed in the same
manner.
[15GB]
[15GB]: Bind Head Tapping Screw-S 3.0X6 MFZN2Y (EP600410)
(Photo.10)
C. DRIVE B Circuit Board
C-1 Remove the two (2) screws marked [15GC]. The DRIVE
B circuit board can then be removed. (Fig.8, Photo.11)
[15GC]
[15GC]: Bind Head Tapping Screw-S 3.0X6 MFZN2Y (EP600410)
(Photo.11)
D. DRIVE C Circuit Board
D-1 Remove the two (2) screws marked [15GD]. The DRIVE
C circuit board can then be removed. (Fig.8, Photo.12)
[15GD]
[15GD]: Bind Head Tapping Screw-S 3.0X6 MFZN2Y (EP600410)
(Photo.12)
20
[15GA]
(Photo.9)
DRIVE A
DRIVE B
DRIVE C
E. MN-PS Unit
E-1 Loosen the four (4) screws marked [141S] and the screw
marked [142S]. The MN-PS unit can then be removed.
(Fig.8)
F. MN Circuit Board
F-1 Remove the six (6) screws marked [22GA]. The MN circuit
board can then be removed. (Fig.8,9)
G. DB Circuit Board
G-1 Remove the two (2) screws marked [32G]. The DB circuit
board can then be removed. (Fig.8,9)
H. SUB POWER SUPPLY Circuit Board
H-1 Remove the four (4) screws marked [42G]. The SUB
POWER SUPPLY circuit board can then be removed.
(Fig.8,9)
I. PWB Circuit Board
I-1 Remove the MN-PS unit. (See procedure B-19-E.)
I-2 Remove the six (6) screws marked [61GC]. The PWB
circuit board can then be removed. (Fig.8,9)
∗
Lay out a cloth, pull out the MN-PS unit, and then remove
the PWB circuit board. (Photo.13)
[32G]
Front view
[22GA]
MN
SUB
POWER
SUPPLY
[42G]
[61GC]
[22GA]: Bind Head Tapping Screw-S 3.0X6 MFZN2Y (EP600410)
[32G]: Bind Head Tapping Screw-S A3.0X6 MFZN2Y (VQ895400)
[42G]: Bind Head Tapping Screw-S 3.0X6 MFZN2Y (EP600410)
[61GC]: Bonding Tapping Screw-C 4.0X8 MFZN2BL (V2433700)
MN-PS unit
(Photo.13)
DB [22GA]
PWB
(Fig.9)
PWB
Cloth