Yamaha MD4S Service Manual page 11

MD4S
Q Q
3 7 6 3 1 5 1 5 0
DISASSEMBLY PROCEDURE
1. Bottom Cover
1-1 Remove the twelve (12) screws marked [520A].
The bottom cover can then be removed. (Fig. 1)
Bottom cover
[520A]
[520A]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
T E
L 1 3 9 4 2 2 9 6 5 1 3
2. MAIN Circuit Board
2-1 Remove the bottom cover. (See Procedure 1.)
2-2 Remove the screw marked [530] and the three
(3) screws marked [520B]. The MAIN circuit
board can then be removed. (Fig. 2)
3. MD Mechanical Unit
3-1 Remove the bottom cover. (See Procedure 1.)
3-2 Remove the four (4) screws marked [520C] and
the screw marked [520D]. The MD mechanical
unit can then be removed. (Fig. 2)
4. SUB 1/3 Circuit Board
4-1 Remove the SHUTTLE knob and JOG knob. (Fig.3)
4-2 Remove the bottom cover. (See Procedure 1.)
4-3 Remove the MD mechanical unit. (See Procedure 3.)
4-4 Remove the two (2) screws marked [520E] and
the four (4) screws marked [500]. The sub chassis
with the SUB 2/3 circuit board and power
w w w
transformer can then be removed. (Fig. 2, 3)
4-5 Remove the SUB 1/3 circuit board while pressing
the twelve (12) hooks marked [A]. (Fig. 5)
11
[520A]
(Fig. 1)
x a o
y
. i
http://www.xiaoyu163.com
8
5. SUB 2/3 Circuit Board
5-1 Remove the bottom cover. (See Procedure 1.)
5-2 Remove the two (2) screws marked [520E], the
six (6) screws marked [520F] and the four (4)
screws marked [520G]. The SUB 2/3 circuit
board can then be removed. (Fig. 2, 3)
5-3 Remove the POWER button from the SUB 2/3
circuit board.
6. SUB 3/3 Circuit Board
6-1 Remove the bottom cover. (See Procedure 1.)
6-2 Remove the two (2) screws marked [520H]. The
SUB 3/3 circuit board can then be removed.
(Fig. 2)
6-3 Remove the two (2) U-shaped holders marked
[410A], then remove the support JACK from the
SUB 3/3 circuit board. (Fig. 6)
[490]
[500]
Q Q
3 7 6 3
Power transformer
[520C]
SUB3/ 3
[520H] MD mechanical unit
[490]: Bind Head Screw 4.0 X 8 MFZN2BL (EG340360)
[500]: Bind Head Tapping Screw-P 4.0 X 12 MFZN2BL (VA847600)
[520]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
[530]: Screw 3B-8Y9294 (VR602100)
(Fig. 2)
u 1 6 3
.
http://www.xiaoyu163.com
2 4
9 9 8
[520G]
SUB2/ 3
[500]
[520B]
1 5 1 5 0 8 9 2 4
[520B]:Japanese
[530] Model
[520D]
[520I]
MAIN
FADER knobs
[520B] MAIN Holder
[520F]
POWER button
m
c o
[520E]
[520]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
(Fig. 4)
2
9 9
9 8 2 9 9
JOG knob SHUTTLE knob
(Fig. 3)