SECTION 4
MAINTENANCE
4.1 BATTERY REMOVAL AND REPLACEMENT
Refer to Part 2.2 for battery installation procedures.
4.2 CLEANING THE MNVD
Wipe the housing with a damp cloth as needed.
CAUTION:
Do not use abrasives or solvents to clean the housing, lens, or display window. Do not use ammonia-
based cleaning products to clean the lens. Doing so may damage the anti-reflective coating of the
lens.
The MNVD lens is designed for the harsh outdoor environment and has a coating for durability and anti-
reflection, but it may require cleaning occasionally. Avoid scratching the lens and/or leaving fingerprints
on the optics. Optics can be damaged by improper cleaning. Clean the lens according to the instructions
below when image quality degradation is noticed or excessive dirt or other contaminant is on the lens.
Do not use abrasive materials, such as paper or scrub brushes as this will possibly damage the lens by
scratching it. Only wipe the lens clean when there is visible contamination on the surface.
PREFERRED METHOD FOR CLEANING THE LENS
Materials:
• Optical-grade cloth
• Pure water (de-ionized or other)
• Isopropyl alcohol (IPA)
Saturate a piece of the lens tissue with the water and drape it over the lens. Let the surface tension of
the water pull the tissue onto the lens surface and then drag the tissue across the lens surface. Repeat
several times with different pieces of tissue.
Repeat the same step using IPA instead of water. Drag the final piece of tissue over the lens several
times to prevent pooling, which could leave a residue behind.
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