Optoma EP780 Service Manual page 38

No Step
6 Screen
Uniformity
7 Light Leak
8 Calibra-
tion
Confidential
Specification
Should be
compliant with
60%.(Minimum)
The unit can't
accept the leak-
age is brighter
then Gary 10
pattern
Calibration Pat-
tern should be in
full screen mode
Procedure
- If not, please return the
unit to repair area.
*Please check and see if
there are dead pixels on
DMD Chip.
- The total number and
distance of dead pixels
should be compliant with
the spec.
- Test Signal :
1024x768@60Hz
- Test Pattern : Gray 10
Pattern
- Please check and see if
the light leaks *Note
- The unit cannot accept
the leakage is brighter
than Gray 10 Pattern
Note:
Light leak on reflective
edge, eyecatcher, bond
wires and exposed metal.
- Once Main Board is
changed, Video Calibration
& PC Calibration should be
done as well.
- Video Calibration
- Test Signal : 480P@60Hz
- Test Pattern : SMPTE bar
- ADC Calibration
(PC Calibration)
- Test
Signal:1024x768@60Hz
- Test Pattern : White (Top)
Black (Bottom)
Note:
1. Calibration Pattern
should be in Full
Screen Mode.
4-4
Photo
EP780