4-3
Table 4-1. Preventive Maintenance Checks and Services
SEQ.
NO.
ITEM TO
CHECK
CHECKING PROCEDURE
NOT FULLY MISSION
CAPABLE IF:
5
Battery
Compart-
ment
Check for corrosion,
springs tension, cap
damaged or retainer
broken. Check O-ring
for cuts or damage.
Springs corroded
or damaged. Re-
tainer broken. Cap
or O-ring damaged
or missing.
6
Function
Switch
Check for operation
(without battery).
Switch inoperative.
Knob missing.
7
Lenses
Inspect for cleanli-
ness, scratches, chips
or cracks. Clean as
required.
Chipped, cracked
or if scratches hin-
der vision through
the sight.
8
Objective
Lens
Check to ensure the
objective lens is not
loose.
Objective lens
loose.
9
Focus
Ring
Check to ensure:
— the focus ring can-
not be moved along
the sight body;
— there is free rotation
through full range of
travel (3/4 turn);
— driving ring and
threaded ring (see
Figure 3-1) are rotated
together.
Focus ring moves
along sight body or
bounded. Driving
ring rotates while
threaded ring does
not move. That
affects ability to
focus properly.
Содержание PS-27
Страница 7: ...1 1 SECTION I introduction...
Страница 17: ...2 1 SECTION II operating instructions...
Страница 31: ...3 1 SECTION III OPERATIONAL DEFECTS...
Страница 37: ...4 1 SECTION IV maintenance instructions...
Страница 43: ...4 7 Figure 4 1 Focusing Assembly Threaded Ring Driving Ring Locking Ring M3x6 Screw M2 5x4 Screw...
Страница 50: ...A 3 4 3 5 Figure A 2 Accessories 1 From the Kit Figure A 3 Accessories 2 Optional 1 1 2 2 3 4 7 8 5 6...
Страница 54: ...INFO 2...
Страница 55: ...INFO 3...