Cleaning Optical Components
Airborne contaminants can deposit on exposed optical faces within the projector.
These deposits, by diffusing the light beams inside the projector, can adversely
affect light output and contrast ratio.
High levels of dust are created during construction or woodworking, both regular
activities during exhibition booth or set erection. Digital Projection recommends
that whenever possible, projectors mounted in the vicinity are turned off during
such activities.
Another cause of contamination is theatrical smoke/fog machines. Chemicals and
oils used by these machines condense onto the optical surfaces within the projector
and form a sticky surface to which particles adhere. Digital Projection recommend
that only non-chemical and non-oil smoke machines are used with
LIGHTNING
displays
and that projectors are not mounted in the vicinity of the smoke machine or
where smoke will enter the projector.
All accessible optical surfaces within the projector are covered in multi-layer anti-
reflective coatings that act as filters or reduce reflections. Hard deposits such as grit
or dust if dragged across these surfaces (by wiping with a tissue or cloth) can cause
damage to the coatings and reduce their effectiveness. However, if care is taken it is
possible to clean a number of optical surfaces within the projector. The following
optical components can be easily reached for cleaning.
1. Cold Mirror - directly in front of the lamp
2. UV Filter - forward of the cold mirror
3. Prism Output Face - immediately behind the projection lens
4. Projection Lens
The following three tier cleaning procedure is recommended for these surfaces.
1. For settled particles such as dust use particle free, oil free, propellant free
compressed air to blow away the particles. Propellant free aerosols allow use in
any orientation without propellant being ejected with the gas..
EÑ6
Fault Finding and Maintenance
MAINTENANCE
LBV00056; Revision A - 23/08/99
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