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JVC AV-48P775/H Service Manual page 13

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3.1.12 MAIN UNIT
• Take out the SPEAKER GRILLE.
• Take out the FRONT PANEL.
• Take out the REAR PANEL.
(1) Remove 4 screws [A] from front side.
(2) Disconnect the connector [CN00Z].
(3) Remove 2 screws [B] attaching the MAIN CHASSIS and
BODY.
(4) Pull out the MAIN UNIT rear side.
NOTE :
• Except for confirmation of projection of images on the screen
and audio output through the speakers, the removed MAIN
UNIT is still workable in the same state as if it is still built-in
the TV set. Therefore, the MAIN UNIT can be removed, if
necessary, for board diagnosis, electric testing, etc. apart
from confirmation of screen images and audio output.
• When wire clamps are removed during work, use care to re-
store them precisely to their original positions. Performance
can be affected if these are not returned to the original posi-
tions.
• Because of the large size, at least 2 persons are
recommended for removal and reassemble.
• When carrying the MAIN UNIT, use care not to drop, shock
or shake it.
• Do not stain or damage the lens of the PROJECTION UNIT.
• Do not look the projection side of a PROJECTION UNIT
when the image is projected.
3.1.12.1 CHECKING THE P.W. BOARD
When checking the MAIN PWB, POWER & LINE FILTER PWB,
DEF & CONVERGENCE OUT PWB, etc., raise the MAIN UNIT
with the front side down for the make of convenience.
3.1.13 FOCUS PACK
• Take out the MAIN UNIT.
(1) Remove 1 screw [C] (Fig.7).
(2) Take out the FOCUS PACK.
(3) Take out wires connecting the FOCUS PACK.
3.1.14 AV TERMINAL BOARD
• Take out the REAR PANEL.
(1) Remove 4 screws [D].
(2) Remove 2 screws [E].
(3) Pull out the POWER CORD CLAMP from AV TERMINAL
BOARD right side.
(4) Disconnect the connector [AU], [DC], [Q] and [SR] on the
DIGITAL INPUT MODULE PWB.
(5) Take out the AV TERMINAL BOARD.
3.1.15 DIGITAL INPUT MODULE PWB
• Take out the AV TERMINAL BOARD.
(1) Remove 1 screw [F].
(2) Remove 2 screws [G] from rear side of the AV TERMINAL
BOARD.
(3) Take out the DIGITAL INPUT MODULE PWB.
NOTE :
• When removing the DIGITAL INPUT MODULE PWB, refer
to the "CAUTION AT DISASSEMBLY" section on page 1-10.
CN00Z
C
(x1)
BODY
A
(x4)
REAR SIDE VIEW
MAIN CHASSIS
B
(x2)
Fig.7
MAIN
FRONT
CHASSIS
AV TERMINAL
BOARD
E
(x2)
D
(x4)
F
(x1)
Fig.8
MAIN UNIT
FOCUS PACK
SPEAKER
WIRE
SPEAKER
CONNECTOR
FRONT
MAIN UNIT
BODY
FRONT
DIGITAL INPUT
MODULE PWB
AU
DC
Q
SR
G
(x2)
POWER
CORD CLAMP
(No.YA173)1-13

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Av-56p785/hAv-56p775/h