Introduction - Barco DP2K-12C Service Manual

7. Cold mirror assembly
7.1

Introduction

Functionality of the cold mirror
The location of the cold mirror in the light path is between the light source (xenon lamp) and the light pipe. The cold mirror reflects
the visible light and absorbs the infra red light. Due to this absorbing, a lot of heat is produced. The cold mirror is mounted with the
rear side upon a big heat sink. The fan above the heat sink blows cold air upon the heat sink and cold. The hot air is transported to
the outside of the projector. The cold mirror has three adjustment screws to modify the position of the cold mirror so that the centre
of the light spot is precisely reflected in the centre of the integration rod entrance for optimal performance.
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Image 7-1
Cold mirror assembly
1 Cold mirror adjustment screws
Diagnostic
The easiest way to check the condition of the cold mirror is by removing the lamp unit. When the lamp unit is removed, the cold
mirror becomes visible at the end of the lamp compartment. In case the cold mirror is not damaged but dirt is clearly visible upon
the surface of the mirror it is recommended to clean the cold mirror. Always replace the cold mirror with a new one in case the cold
mirror is damaged. Possible damages are:
• Cold mirror is broken.
• Coating peels off.
• Cold mirror is cracked.
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R5905043 DP2K-12C/11CX 19/02/2018
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