Optoma EX774 Serivce Manual page 17

Check the
projection
Screen
Yes
Check using all black/white screens
with PC connection
Yes
Are abnormalities
noticeable on
projection screen?
No
Does the lamp
go off during
operation?
No
Yes
Is LAMP
again?
No
Over Temp LED:
No
System OK
Normal operation
Company Confidential
Yes
Yes
Light
Yes
ON
Optoma_______________________
• Black lines on screen (horizontal and vertical)
→ DMD Set malfunction
• Missing pixels (Missing white: 1 or more, missing black: 5 or
more, or sequence missing pixels)
→ DMD Set malfunction
• Shadows on screen
→ Dirt on DMD/projection lens surface
• Bluish shadows on corners of screen (during white screen
display)
→ Shifted optical axis of Lens Base Unit
No
• Lamp malfunction
• Power Supply Unit malfunction
• Temperature protector operated due to the increase in
temperature based on operating environment
• Temperature protector operated due to blocked suction and
exhaust holes or dirty fan
17
Rev. 00
No
No
Delta____________
2008/07/02