Zenith D52WLCD Series Service Manual page 37

CORRECTION OF SCREEN TILT & KEYSTONE
3. Working Method and Improvement for Correction Mechanism of Tilt and Keystone
3.1 Working Method
(1) Put the 3t spacer on back of bottom parts of Mirror to correcting the Mirror angle of bottom parts
- To correct difference between Mirror angle of C/A and JIG angle of lighting parts.
(2) Looking at the screen, push the engine base for left/right direction in front of engine. At this time, check the screen Keystone
condition.
(3) Adjust engine angle by turning the adjustment Knob on the bottom part.
(4) If Tilt and Keystone is [MAX-MIN] # 4mm, lock the locking Knob of left/right in front part and then fix the fixing boss with screw.
3.2 Improvement
When turning left and right rotation, because an engine construction structure is touched a construction structure of cabinet, shield
case will be correction. When turning adjustment Knob, operation is bad because you can't input a hand to turning or adjustment
Knob is tight.
Continously consult with the production department for improving adjustment operation. (A special Driber for adjustment and so on)
engine base
Adjustment Knob
3t spacer
Fixing Boss
Adjustment Knob
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engine