Yamaha MD4S Service Manual page 12

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3 7 6 3 1 5 1 5 0
Top cover
[A]
SUB1/ 3
(Fig. 5)
7. MIX 1/2 Circuit Board
7-1 Remove the five (5) FADER knobs. (Fig. 3)
7-2 Remove the bottom cover. (See Procedure 1.)
7-3 Remove the SUB 2/3 circuit board. (See Procedure 5.)
7-4 Remove the MAIN circuit board. (See Procedure 2.)
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L 1 3 9 4 2 2 9 6 5 1 3
7-5 Remove the four (4) screws marked [520I] and
the screw marked [520D]. The MAIN holder
can then be removed. (Fig. 2)
7-6 Remove the MD mechanical unit. (See Procedure 3.)
7-7 Remove the eight (8) screws marked [520J].
The MIX 1/2 circuit board can then be removed.
(Fig. 7)
8. MIX 2/2 (INPUT) Circuit Board
8-1 Remove the bottom cover. (See Procedure 1.)
8-2 Remove the two (2) screws marked [520E] and
the four (4) screws marked [500]. The power
transformer with the SUB 2/3 circuit board can
then be removed. (Fig. 2, 3)
8-3 Remove the screw marked [510]. The shield
INPUT can then be removed. (Fig. 7)
8-4 Remove the two (2) screws marked [520K]. The
MIX 2/2 (INPUT) circuit board can then be
removed. (Fig. 7)
8-5 Remove the four (4) screws marked [520L] and
the two (2) U-shaped holders marked [410B].
The support JACK can then be removed from
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the MIX 2/2 (INPUT) circuit board. (Fig. 8)
9. Power Transformer
.
9-1 Remove the bottom cover. (See Procedure 1.)
9-2 Remove the two (2) screws marked [490]. The
power transformer can then be removed. (Fig. 2)
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[410A]
Support JACK
[410A]: U-shaped Holder MET41-0191 (VI549000)
(Fig. 6)
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8 9
MIX2/2 ( INPUT )
[510]
MIX1/2
[510]: Bind Head Screw 3.0 X 6 MFZN2BL (EG330360)
[520]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
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3 7 6 3 1 5 1
(Fig. 7)
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.
2 4 2
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Shield INPUT
[520K]
[520L]
[520J]
[410B]: U-shaped Holder MET41-0191
[520L]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL
(Fig. 8)
5 0 8 9 2 4 9 8 2
m
MD4S
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[410B]
(VI549000)
(EP600190)
9 9
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