Remove The Amplifier Assembly. (See Procedure - Yamaha MS400 Service Manual

MS400
QQ
3 7 63 1515 0
6. Handle
6-1. Remove the cabinet assembly. (See Procedure 2.)
6-2. Remove the two (2) screws marked [70] and the two
(2) nuts marked [80]. The handle can then be
removed. (Fig.3)
7. Heat sink
7-1.

Remove the amplifier assembly. (See Procedure 1.)

7-2. Remove the AMP 1/5 circuit board. (See Step 4-2.)
7-3. Remove the three (3) screws marked [120]. The heat
sink can then be removed. (Fig.2)
TE
L 13942296513
IC BLOCK DIAGRAM
NJM2068L-D
(IC101,103,104,105,106,107,108)
NJM4580L
(IC102)
Operational Amplifier
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A
1
OUT
A
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[120]: Bonding Screw-B 4.0 X 8 MFZN2BL (VR779900)
XM356A00
( )
XF195A00
( )
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B
2 3 4 5 6 7 8
+ +
+
IN IN V IN IN OUT V
B B B
A A
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8
Q Q
[70]
3 6 7 1 3
[80]
Fig.3
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1 5 0 5 8 2 9 9 4
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9 9
2 8 9 9