JVC AV-N48P55 Service Manual page 12

3.1.11 MAIN UNIT
• Take out the SPEAKER GRILLE.
• Take out the FRONT PANEL.
• Take out the REAR PANEL.
(1) Remove 4 screws [ O ] from front side.
(2) Take out the connector [BH], [R], [BG] on the FRONT
CONTROL PWB.
(3) Remove 2 screws [ P ] 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 restore them precisely to their original positions.
Performance can be affected if these are not returned
to the original positions.
• Because of the large size, at least two 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.
3.1.11.1 CHECKING THE P.W. BOARD
When checking the MAIN PWB, POWER PWB, DEF &
CONVERGENCE OUT PWB, etc., raise the MAIN UNIT with the
front side down for the make of convenience.
3.1.12 FOCUS PACK
• Take out the MAIN UNIT.
(1) Remove 1 screw [ Q ].
(2) Take out the FOCUS PACK.
(3) Take out 9 wires connecting the FOCUS PACK.
3.1.13 AV TERMINAL BOARD
• Take out the REAR PANEL.
(1) Remove 4 screws [ R ].
(2) Pull out the POWER CORD CLAMP from AV TERMINAL
BOARD right side.
(3) Disconnect the connector [AU], [DC], [Q] and [SR] on the
DIGITAL INPUT MODULE PWB.
(4) Take out the AV TERMINAL BOARD.
1-12 (No.YA166)
Q
FOCUS PACK
SPEAKER
WIRE
BODY
O
Fig.7
MAIN
CHASSIS
AV TERMINAL
BOARD
R
Fig.8
P
MAIN UNIT
SPEAKER
WIRE
SPEAKER
CONNECTOR
POWER CORD