2. Optical Trouble Shooting Guide
No.
Item Trouble Shooting Guide
1 Brightness Change lamp
2 Uniformity Change lamp
3 FOFO Contrast
Check ADC calibration
Check user’s menu brightness & contrast are default
Clean DMD
Clean PL
Check ILL stop ass’y
4 ANSI Contrast
Clean PL
Clean DMD
Change PL
5 Color
Check color wheel delay
Check CW 50% point. Replace CW if necessary
6 Color Uniformity Change lamp
7 Blue Edge
Refer to Item#2-1 (attached below)
Change CM
Change SUB HSG
8 Blue/Purple Border
Refer to Item#2-1(attached below)
Change CM
Change SUB HSG
9 Focus
Change Projection Lens
Check parallel between PL datum and DMD
10 Dust Clean DMD
11
Horizontal/Vertical
Strips
Check connector between chip BD and Main BD
Re-install DMD with chip BD
Check if any pin of C-Spring is missing, damaged or dirty
Change new Chip BD/C-Spring
Change new DMD
12 Pixel Fail Change new DMD
2-1. “Blue Edge” Trouble Shooting:
1. Re-adjust “Overfill” first.
2. For Overfill Re-adjustment:
(1) Those 2 Adjustment Screws must be released for around 2 mm first.
(2) Alignment Sequence: To adjust “Horizontal Adjustment Screw” firstly, then “Vertical
Adjustment Screw”. Refer to Figure 2-1.
Fig. 2-1
(3) Re-assemble LP module—include LP, LP Baffle, LP clip.
(2) Overfill Vertical
Adjustment Screw
(1) Overfill Horizontal
Adjustment Screw
Confidential - Do Not Copy
PJD5122
ViewSonic Corporation
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