13. HDF Light Processor
13.8 Adjusting the Fold Mirror
Purpose of the Fold Mirror
The fold m irror is f olding up the light path of the projector to make the projector more compact. The fold mirror is located at the left
side of the light pipe and reflects the light, w hich entrance the light pipe via the integration r od, upon the prism of the light processor.
The position of the light spot upon the DMD’s can be adjusted with the fold m irror.
CAUTION: Normally the Fold Mirror should never be readjusted in the field. In case a readjustment is required
follow the instructions in this chapter precisely. Only qualified technicians who have experience
with adjust-
ing the Fold Mirror may adjust the Fold Mirror. A misaligned Fold Mirror may cause irreversible damage to
other parts of the projector!
To access all three adjustment screws of the Fold Mirror the left side cover has to be removed from the pro-
jector. Both top adjustment screws are easy accessible but to reach the bottom screw, the Fold Mirror cover
plate together with the light sensor unit has be removed from the Light Pipe. This procedure assumes that
the left side cover is already removed from the projector.
In most cases the Fold Mirror can be correctly aligned by turning the upper two adjustment screws of the Fold
Mirror. These upper two screws can be accessed with a nut driver through the holes of the Fold Mirror cover.
So, the removal of the Fold Mirror cover is unnecessary.
How to adjust the Fold Mirror
1. D isconnect the wire unit from the Light Sensor Module.
2. R emov e the Fold Mirror c over and the Light Sensor Module as a whole from the Light Pipe as illustrated. Remove both indicated
Torx screw (re fere n ce 1).
1
Image 13-20
Fold mirror, access adjustments
3. S tart up de projector and display a white test pattern with m axim um dimming.
Caution: Projecting a misaligned light spot for more then 10 seconds may cause irreversible damage to the Light Processor.
Therefore, it is important to maximum dim the light output and adjust the light s pot as quickly as possible.
4. Turn the adjus tment screws A, B or C in or out until the light spot (5) matches with the outline of the DMDs (4). Use a 5,5 mm open
end w rench. The illustration below shows the movements of the light spot (5) upon the screen (6) for each adjustment screw.
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R5905312 HDF W SERIES 24/01/2013
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