LG RD-JT91 Service Manual page 14

4-2. Illuminator Adjustment Sequence
Check the full white screen refer to (Fig 4-3) and make
adjustments in the following sequence.
(1) Up and Down Adjustment
1) Mark screw (A) in its original position. Turn screw (A) up /
down adjustment to the left and mark where the image is
aligned.
2) Mark screw (A) in its original position. Turn screw (A) up /
down adjustment to the right and mark where the image is
aligned.
3) Turn screw (A) up / down adjustment to the right / left and
mark where the image is aligned. Fix the adjustment screw
in position.
Step 1 Step 2
<Fig.4-4> Illuminator up / down Adjustment Sequence
(2) Left and Right Adjustment 1
1) Mark screw (B) in its original position. Turn screw (B) Left /
Right adjustment to the right and mark where the image is
aligned.
2) Mark screw (B) in its original position. Turn screw (B) Left /
Right adjustment to the left and mark where the image is
aligned.
3) Turn screw (B) Left / Right adjustment to the right / left and
mark where the image is aligned. Fix the adjustment screw
in position.
Step 1 Step 2
<Fig.4-5> Illuminator Left/Right Adjustment Sequence 1
(3) Left and Right Adjustment 2
1) Mark screw (C) in its original position. Turn screw (C) up /
down adjustment to the right and mark where the image is
aligned.
2) Mark screw (C) in its original position. Turn screw (C) up /
down adjustment to the left and mark where the image is
aligned.
3) Turn screw (C) up / down adjustment to the right / left and
mark where the image is aligned. Fix the adjustment screw
in position.
Step 1 Step 2
<Fig.4-6> Illuminator Left/Right Adjustment Sequence 2
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Step 3
Step 3
Step 3
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(4) Final Adjustment
Repeat turn screw (C) up / down adjustment to the right / left
and mark where the image is aligned. Fix the adjustment
screw in position. 1), 2), 3) adjustment twice and find the
optimum position. Check the image with the naked eye for
optimum alignment.