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2.8.2 Optical
Unnecessary cleaning of optics can be more harmful than helpful, increasing the risk of degrading delicate
coatings and surfaces. In this projector, check only the lens and lamp reflector. Maintenance of other optical
components requires a Christie authorized service technician. Check these components periodically in a clean,
dust-free environment using a high-intensity light source or flashlight. Clean them only when dust, dirt, oil,
fingerprints or other marks are obvious. Never touch an optical surface with your bare hands. Always wear
latex lab gloves.
Optical Component Cleaning Supplies
• Soft camel-hair brush
• Dust-free blower - filtered dry nitrogen blown through an anti-static nozzle
• Dust-free lens tissue such as Melles Griot Kodak tissues (18LAB020), Opto-Wipes (18LAB022), Kim
Wipes or equivalent
• For lens only. Lens cleaning solution such as Melles Griot Optics Cleaning Fluid 18LAB011 or equivalent
• For reflector only. Methanol
• Cotton swabs with wooden stems only
• Lens cleaning cloth/microfiber such as Melles Griot 18LAB024 or equivalent
2.8.3 Cleaning the Lens
Check: Periodically
A small amount of dust or dirt on the lens has minimal effect on image quality. To avoid the risk of scratching
the lens, clean only if absolutely necessary.
Dust:
1. Brush most of the dust off the lens with a camel-hair brush and/or blow dust away with compressed air.
2. Fold a microfiber cloth smooth and gently wipe remaining dust particles off the lens. Make sure to wipe
evenly with the smooth portion of the cloth that has no folds or creases. Do not apply pressure with your
fingers - use the tension in the folded cloth itself to collect dust.
3. If significant dust is still bound to the surface, dampen a clean microfiber cloth with coated optics cleaning
solution (damp, not dripping). Wipe gently until clean.
Fingerprints, smudges, or oil present:
1. Brush most of the dust off with a camel-hair brush and/or blow dust away with compressed air.
2. Roll a lens tissue around a swab and soak it in the coated optics cleaning solution. Tissue should be damp
but not dripping.
3. Gently wipe the surface using a figure eight motion. Repeat this motion until the blemish is removed.
D4K35 Service Manual
020-100817-01 Rev. 1 (04-2012)
Section 2: Service Guidelines
2-7
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