NEC NP110 - Manual (Page 73)

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6. Maintenance
This section describes the simple maintenance procedures you should follow to clean the cabinet and the lens, and
replace the lamp.
1 Cleaning the Cabinet and the Lens
1. turn off the projector before cleaning.
2. Clean the cabinet periodically with a damp cloth. if heavily soiled, use a mild detergent. never use strong
detergents or solvents such as alcohol or thinner.
Note on Cleaning the Lens
Use a blower or lens paper to clean the lens, and be careful not to scratch or mar the lens.
Vacuum the ventilation
inlet of the cabinet.