SP7205 Service Manual
24
Optical Engine
The optical engine fastens to the bottom case. The body of the engine fastens to the optical engine
mounting bracket, while the light tunnel fastens directly to the bottom case near the lamp house. The
engine comprises all parts in the light path including the:
•
DMD - produces the image by reflecting wanted pixels through the projection lens and
discarding unwanted pixels by reflecting them to a "dump light" area inside the engine.
•
DMD driver board - formats the image signal for interpretation by the DMD
•
Color wheel - provides colors for the DMD to use in image production
•
Light tunnel - conducts focused light from the lamp module to the DMD
•
Light tunnel heater - maintains a stable light tunnel temperature, preventing unwanted
expansion and contraction that degrades the image
•
Photodiode - reads color wheel rotation to maintain proper synchronization with the DMD and
allow accurate image color reproduction
•
Projection lens - focuses or changes the size of the image produced by the DMD
1
Remove the following items:
Lamp door and lamp module (page 35)
Outer handle (page 37)
Rear bezel (page 42)
Top case (page 47)
Inner handle and front vent (page 31)
Controller ECA (page 14)
2
Remove the M3x8 Torx screw that fastens the optical engine to the chassis.
