Table Of Contents - Yamaha MS400 Service Manual

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4. AMP Circuit Boards (1/5 to 5/5)
4-1. Remove the amplifier assembly. (See Procedure 1.)
4-2. Remove the screws and the knob from each circuit
board, which can then be removed. (Fig. 2)
PCB Name Ref No.
AMP1/5
Circuit Board 100
AMP2/5 80A
Circuit Board 130
AMP3/5
110A
Circuit Board
AMP4/5 110B
Circuit Board
AMP5/5 150
Circuit Board 160
170
200
5. Power transformer
5-1. Remove the amplifier assembly. (See Procedure 1.)
5-2. Remove the four (4) screws marked [80B]. The power
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L 13942296513
transformer can then be removed. (Fig. 2)
[80B]
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Description
90 Bind Head Tapping Screw-B 3.0 X 12 MFZN2BL (VQ074600)
Bind Head Screw SP 3.0 X 8 MFZN2Y (EG330290)
Bonding Screw-B 4.0 X 12 MFZN2BL (V7242900)
Bind Head Screw 4.0 X 8 MFZN2BL (VP156800)
Bonding Screw-B 3.0 X 8 MFZN2BL (VN413300)
Bonding Screw-B 3.0 X 8 MFZN2BL (VN413300)
Hexagonal Nut
Knob MX-GREEN/D-GRAY (VU860200)
Knob ORANGE/D-GRAY (VV625800)
Knob RED/D-GRAY (VU860400)
Button 3 X 25 MFZN2BL (V3289800)
Hexagonal
nut
[80A]
x ao [80]: Bonding Screw-B 4.0 X 12 MFZN2BL (V7242900)
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3 6 7 1 3
[100]
[90]
[120]
[150]
AMP
[200]
[170]
[160]
AMP 4/5
[110B]
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Fig.2
.
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
AMP 1/5
[90]
5/5
AMP
[110A]
AMP 2/5 m
[130]
co
MS400
9 9
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10
4
2
1
2
6
1
2
2
1
4
2 8 9 9
3/5
9