Barco DP2K-12C, Service Manual

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7. Cold mirror assembly
7.5 Adjusting the cold mirror
The position of the xenon bulb in its re fl ector effects the position of the cold mirror with respect to the entrance
of the integration rod. Hence the adjustment of the cold mirror requires simultaneous adjustment of the xenon
bulb in its re
fl ector for maximum light output. Once the cold mirror and xenon bulb are optimally adjusted,
the cold mirror should never be adjusted again. A xenon bulb replacement only requires realignment of the
lamp in its re
fl ector. Only when a cold mirror is replaced, should it be readjusted.
Necessary tools
• 10 mm open-end wrench.
• 7 mm nut driver.
• Light meter.
• Slide caliper.
How to setup the projector for adjusting the cold mirror?
1. Remove the left cover and lamp cover of the projector.
2. Loosen the three lock nuts (reference 4 image 7-10) of the cold mirror adjustment screws. Use for that a 10 mm open-end wrench.
3
4
1
4
2
4
Image 7-10
3. Check the nominal position of the cold mirror and if required adjust. The distance between the head of the each adjustment screw
(reference 1, 2 & 3 image 7-10) and the assembly plate should be 32,5 mm for nominal position. This distance corresponds with
17,4 mm between the cold mirror and its mounting surface. This nominal position is the best position to start the adjustment
procedure. Normally the cold mirror spare part is delivered with the cold mirror in its nominal position.
17,4
32,5
32,5
Image 7-11
4. Project a white test pattern.
5. Place the light meter in the center of the projected image.
How to adjust the cold mirror?
1. Turn the adjustment screw 2 (reference 2 image 7-12) in or out until the maximum light output is measured. Use for that a 7 mm
nut driver.
R5905043 DP2K-12C/11CX 19/02/2018 131