Specifications

E. Chicken Wire
Chicken Wire is an irregular pattern of dark thin lines that can appear in the field of view, either
throughout the image area or in sections of the image area (See Figure 4-5). In the worst-case sce-
nario, these lines will form hexagonal or square, wave-shaped lines. No action is required if this con-
dition is present, unless it interferes with the user’s ability to view an image or their ability to perform
missions.
Figure 4-5. CHICKEN WIRE
4.4 Maintenance
4.4.1 General
The NM-108 BC operator maintenance consists of operational tests, inspections for the unit service-
ability, cleaning and mounting procedures, corrective actions (troubleshooting and replacement of a
limited number of parts). Maintenance instructions covered elsewhere in this manual (PMCS, trou-
bleshooting, etc.) are not repeated in this section.
CAUTION:
The NM-108 BC is a precision electro-optical instrument and must be handled carefully at all
times to prevent damage.
4.4.2 Cleaning Procedures
CAUTION:
Thoroughly dry each item before placing them into the storage case.
Clean the NM-108 BC as follows:
1. Gently brush off any dirt from the device’s body using a clean soft cloth.
2. Moisten the cloth with fresh water and gently wipe external surfaces (except for glass surfaces).
3. Dry any wet surfaces (except for glass surfaces) with another clean, soft, dry cloth.
4. Using a lens brush, carefully remove all loose dirt from the glass surface.
5. Slightly dampen a cotton swab with ethanol. Gently and slowly wipe the lenses (including the
photoreceiver and the pivotal focusing lens). Without touching the lens holders, clean the glass sur-
faces in circular movements, beginning in the centre and moving out towards the edge. Change the
cotton swab after each circular stroke. Repeat until the glass surfaces are clean.
6. Clean the battery surfaces and contacts with a pencil eraser and/or alcohol-dampened cotton
swabs.
Clean optional equipment with a soft brush (cloth), soap, and water as required.