JVC RX-5042S Service Manual page 9

3.8 Removing the main board
(See Fig.9)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, remove the tie bands
fixing the wires.
(2) Remove the tie band and remove the wire protection board
fixing the card wire.
(3) Remove the solders from the soldered sections b on the
speaker terminal board attaching the parallel wires.
(4) Disconnect the relay board from the connectors (CN291,
CN491) on the power supply board and front board.
(5) Disconnect the parallel wire from the connector
the power supply board.
(6) Disconnect the wire from the connector
power transformer board 1.
(7) Disconnect the wires from the connectors CN471,
and CN473 on the front board.
(8) Remove the screw G, two screws H and four screws J
attaching the main board.
(9) Take out the main board from the main body.
3.9 Removing the heat sink
(See Figs.10 and 11)
• Prior to performing the following procedures, remove the top
cover and main board.
(1) Remove the three screws K attaching the heat sink. (See
Fig.10.)
(2) From the reverse side of the main board, remove the two
screws L attaching the heat sink. (See Fig.11.)
3.10 Removing the power ICs
(See Figs.11)
• Prior to performing the following procedures, remove the top
cover, main board and heat sink.
(1) From the reverse side of the main board, remove the
solders from the soldered sections c on the main board.
(2) Take out the power ICs.
Wire protection board
Tie band
CN241 on
CN251 on the
J
CN472
K
Card wire
CN473
Front board
Heat sink
Main board
L
Main board
Relay board
J
J
Tie bands
CN241
CN491
Speaker terminal board
CN471
CN472
Soldered sections b
Fig.9
Fig.10
Soldered section c
Heat sink
Fig.11
Power supply board
Tie band
CN251
CN291
Power
transformer
board 1
G
Parallel wires
K
Power IC
L
Main board
(No.MB171)1-9