JVC TH-A30 Service Manual page 7

Removing the DSP board
Prior to performing the following procedure, remove
the top cover, front panel assembly, DVD
mechanism assembly and jack board.
1. Remove the harness band fixing the harness.
2. Disconnect the harness from the connector J9 and
J10 on the DSP board.
3. Disconnect the card wire from the connector J1 and
J3 on the DSP board.
4. Remove the one screw L attaching the DSP board.
5. Remove the screw M1 and remove the earth wire.
6. Remove the one screw I attaching the DSP board to
the rear panel (see fig.7).
7. Pull up the DSP board from the front side upwards
disconnecting the connector J2, J5, J6 and J7.
Removing the main board
Prior to performing the following procedure, remove
the top cover, front panel assembly, power cord,
DVD mechanism assembly, jack board
board.
1. Disconnect the card wire from the connector CW8 on
the main board.
2. Disconnect the harness from the connector ACW2,
ACW3, ACW4 and ACW5 on the main board.
3. Remove the five screws J attaching the speaker
terminals and jack to the rear panel (see fig.7).
4. Remove the nine screws M2 attaching the main
board.
5. When the rear panel is not removed, pull up the
main board from front side.
Removing the power transistor & power IC
Prior to performing the following procedure, remove
the top cover, front panel assembly, DVD
mechanism assembly, jack board, DSP board and
main board.
1. After removing the solder part 1 soldered to the main
board, remove each screw and remove the heat sink
from the power transistor.
2. After removing the solder part 2 soldered to the main
board, remove each screw and remove the heat sink
from the power IC.
(See Fig.9)
(See Fig.10)
and DSP
ACW2
CW8
M2
(See Fig.10 to 12)
Harness band
DSP board
J10
J9
J6 J5 J7
M1
(fixing the
earth wire)
Fig.9
M2
Main board
Fig.10
Solder part 1
(Each power transistor is fixed)
Solder part 3
(Power IC is fixed)
Solder part 2
(Power IC is fixed)
Fig.11
J3 J1
L
J2
Heat sink1
M2
Heat sink2
ACW3
M2
Heat sink3
ACW5
ACW4
Main board
(Reverse side )
TH-A30
1-7