JVC TH-A30 Service Manual page 8

TH-A30
3. The power ICs fixed to the heat sink 3 can be
removed individually that it is easy to remove
screws (in meaning that a screw driver reaches). It is
not necessary to remove whole like above-
mentioned 1. and 2. .
After removing each screw which is fixing each
power IC to the heat sink 3, the solder part 3 to
which it corresponds on the main board is removed.
In addition, probably, the way after removing the
whole will be safe when a screw driver does not
reach too.
Removing the power transformer
Prior to performing the following procedure, remove
the top cover.
1.
Cut off the tie band fixing the harness, if needed.
2.
Disconnect the harness from the connector ACW2
(see fig.10), ACW3, ACW4 and ACW5 on the main
board.
3.
Remove the four screws N attaching the power
transformer.
<Front panel assembly section>
Removing the display board & switch
board
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
1. Disconnect the card wire from the connector FCW1
and FCW2 on the display board.
2. Remove the five screws A attaching the display
board on the inner of the front panel assembly.
3. Remove the four screws B attaching the switch
board on the inner of the front panel assembly.
4. Disconnect the harness from connector FW2 on the
display board, if needed.
Removing the front window
Prior to performing the following procedure, remove
the top cover, front panel assembly, display board
and switch board.
1. Remove the switch buttons, if needed.
2. Remove the three screws C attaching the front
window on the front panel.
3. Remove the eight claws fixing the front window on
the front panel.
1-8
(See Fig.13)
(See Fig.1 and 2)
(See Fig.2 and 3)
Heat sink 3
(to which power
IC is attached)
Screws
Heat sink 2
(to which power
IC is attached)
Heat sink 1
(to which power
transistor is attached)
Fig.12
Tie band
N
Fig.13
Display board
FCW2 FCW1
A
Fig.1
Switch button
C
Front window
Fig.3
ACW4 ACW3
ACW5
Power
transformer
Front panel assembly
(inner side)
Switch board
FW2
B
Front panel assembly
(inner side)
C C
Claw
Fig.2
Front panel assembly
(front side)