4-10
Table 4-2. Troubleshooting Procedures
PROBLEM
PROBABLE CAUSE
CORRECTIVE ACTION
Cannot
achieve the
sharp image
of the object
Focus ring able
to move along the
sight body. Locking
ring loose (see
Figure 3-1).
(1) Loosen three screws
M2.5x4 more than a turn.
(2) Tighten the locking
ring and fix it with the
screws.
(3) Rotate focus ring
slightly clock-wise/coun-
terclockwise.
Repeat the steps 1-3
three times.
(4) Remove the screws
M2.5x4, apply a small
amount of thread locker
on threads, install the
screws and tighten.
Sight affects
boresight
after installa-
tion or during
the firing.
Objective lens
loose.
Send the sight to the
service center.
Factory alignment
broken.
Send the sight to the
service center.
Summary of Contents for PS-27
Page 7: ...1 1 SECTION I introduction...
Page 17: ...2 1 SECTION II operating instructions...
Page 31: ...3 1 SECTION III OPERATIONAL DEFECTS...
Page 37: ...4 1 SECTION IV maintenance instructions...
Page 54: ...INFO 2...
Page 55: ...INFO 3...