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3.9
Removing the main board
(See Fig.11)
• Prior to performing the following procedure, remove the top
cover and stay bracket.
(1) From the top side of the main body, remove the solders
from the soldered section b on the speaker terminal board
attaching the parallel wires.
(2) Disconnect the relay board from the connectors
and
CN491
on the power supply board and front board.
(3) Disconnect the parallel wire from the connector
the power supply board.
(4) Disconnect the wire from the connector
er transformer board 1.
(5) Disconnect the wires from the connectors CN471,
and
CN473
on the front board.
(6) Remove the screw M, two screws N and four screws P at-
taching the main board.
3.10 Removing the heat sink
(See Figs.12 and 13)
• Prior to performing the following procedure, remove the top
cover, stay bracket and main board.
(1) Remove the ten screws Q attaching the heat sink of the
main board. (See Fig.12)
(2) From the reverse side of the main board, remove the two
screws R attaching the heat sink. (See Fig.13)
1-10 (No.MB502)
Wire
protection
board
CN291
CN241
on
CN251
on the pow-
P
CN472
N
M
Main board
R
Relay
P
P
board
Main
board
CN473
CN472
Front
CN471
CN491
board
Fig.11
Heat sink
Fig.12
Fig.13
Power
Power
transformer
supply
board 1
board
CN241
CN251
CN291
N
Speaker
terminal
Soldered
board
section b
Q
Q
Heat sink
R
Main board
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