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E. Installation of the sacrificial window. Perform the following
procedure to install the sacrificial window. Refer to Figure 2-3.
CAUTION
IF ADVERSE OPERATING CONDITIONS (DUST OR SAND),
ARE KNOWN TO EXIST, ATTACH THE SACRIFICIAL WINDOW
TO PROTECT THE OBJECTIVE LENS FROM SCRATCHES OR
OTHER DAMAGE.
1. If the compass assembly or lens cap is in place, remove it.
2. Carefully push the sacrificial window over the objective lens un-
til it stops. Turn the sacrificial window clockwise until it snaps into
place.
F. Installation of the Compass Assembly.
Figure 2-4. Installation of Compass
NOTE
a. Prepare the PVS-7 for operation (paragraph 2-6).
b. Leave LIF in place when installing the compass assembly.
c. Ensure the Neck cord is secured to the compass and clothing
before installing.
1. If the sacrificial window or lens cap is in place, remove it.
2. Turn the PVS-7 on.
3. Rotate the objective lens focus completely counterclockwise
(while looking through the goggle).
2-14
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