72Optical Problems Checking ItemsNo. Item Trouble Shooting Guide1 Brightness 1. Change lamp2 Uniformity 1. Change lamp3 FOFO Contrast1. Check ADC calibration2. Check user’s menu brightness & contrast are default3. Clean DMD4. Clean PL5. Check ILL stop assy4 ANSI Contrast1. Clean PL2. Clean DMD3. Change PL5 Color 1. Check color wheel delay2. Check CW 50% point. Replace CW if necessary6 Color Uniformity 1. Change lamp7 Blue Edge1. Refer to next page2. Change CM3. Change SUB HSG8 Blue/Purple Border1. Refer to next page2. Change CM3. Change SUB HSG9 Focus 1. Change Projection Lens2. Check PL datum and DMD parallel10 Dust Clean DMD11 Horizontal/VerticalStrips1. Check connector between chip BD and Main BD2. Re-install DMD with chip BD3. Check if any pin of C-Spring is missing, damaged or dirty4. Change new Chip BD/C-Spring5. Change new DMD12 Pixel Fail Change new DMD