C 10, TM 9-2350-230-12
TABLE 8-4. TROUBLESHOOTING - CONTINUED
Malfunction
Probable cause
Corrective action
SIGHTING AND FIRE-CONTROL
INSTRUMENTS-CONTINUED
PERISCOPE XM44 SERIES-
CONTINUED
Moisture in head and/or body
Purge, leak test, and
fogging, XM44E
pressurize (TM 750-116).
Series only
pressure.
NOTE. For any malfunctions not listed, notify support maintenance.
TELESCOPE, ARTICULATED, M119 OR M127
MOUNT, TELESCOPE M149
INDICATOR, AZIMUTH 10954720
NOTE. For any malfunction of telescope, telescope mount, or azimuth indicator, notify support maintenance.
QUADRANT (ELEVATION) M13A1C
139.
a.
Worm plunger too tight
a.
Replace quadrant (fig. 11-39).
and knob will not
turn
b.
Elevating worm bent
b.
Replace quadrant.
140.
Index travels beyond
Stops out of mounting groove
Replace quadrant.
scale limits.
141.
Excessive backlash.
a.
a.
Replace quadrant
b.
Loose or worn plunger
b.
Replace quadrant.
c.
Broken spring
c.
Replace quadrant.
142.
Depression and ele-
a.
Poorly spaced worm or
a.
Replace quadrant.
vation errors
worm gear teeth.
143.
Level bubble out of
Bubble improperly adjusted
Replace quadrant.
adjustment.
PERISCOPES M47 AND M48
144.
Poor visibility
a. Refer to TM 750-116.
b. Dirty prisms
b. Clean.
145.
Wiper blades smear
Worn wiper blade
prisms.
8-44