Sharp PG-C20XU Service Manual page 21

Adjusting the mirrors
This adjustment is needed when any of the optical parts of the optical mechanism has been replaced.
1. Disconnect the flat cables from all the LCD panels.
2. Light up the lamp.
3. Project a white-light image and check to see if there is any color tint in any direction. If any, loosen the incident-light
fly-eye adjusting plate lock screws and readjust the fly-eye to get the image uniformly whitish. Tighten up the lock
screws.
4. If by any chance the above step 3 fails, use the M1, M4 and M5 adjusting levers.
5. Before moving the M5 adjusting lever, shield the G and B color beams. (For shielding them, use reflective sheets
that reflect the incident lights.)
6. Loosen the adjusting lever lock screws, make adjustments, and tighten up the lock screws.
7. Before moving the M4 adjusting lever, shield the R and G color beams.
Shielding plate for B
Lock screws
(yellow)
M4 Adjusting lever
Correcting color irregularities on white-only screen when replacing the lamp
If color irregularities are found at the right and left on a white-only screen after replacing the lamp, it is necessary to
readjust the optical axis of the new lamp. Take the following steps.
1. Open the lamp cover and loosen the screws A, B and C at the bottom of the lamp.
2. Using a screwdriver or the like, move the U-shaped groove at the window D in the arrow direction.
3. Temporarily fix the screws A, B and C, close the lamp cover, and check the white-only screen again for color
irregularities.
4. Repeat the above steps 1, 2 and 3 until there will be no color irregularities. Now tighten up the screws A, B and C.
5. Finally secure the lamp cover back in position.
Front
M5 Adjusting lever
Shielding plate for R
Lock screws
(yellow)
Shielding plate for G
Screw A
Screw B
D
Lamp assembly (bottom view)
21
Lock screws
(yellow)
incident-light fly-eye
adjusting plate
Lock screws
(yellow)
M1 Adjusting lever
Screw C
PG-C20XU
PG-C20XE
AN-Z7T