TM9-2350-230-12
Table 5-1. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
M13AIC OUADRANT
66. Zero graduations on elevation
a. Loose elevation knob
a. Level gun with M1A1 quadrant and
scale and micrometer scale
align MI3AIC quadrant micrometer
do not coincide
b. Loose elevation scale mounting screws.
b. Align scale (Fig. 2-28) and tighten
screws.
67. With level bubble centered,
Scales improperly adjusted
Adjust scales (Fig. 2-28).
elevation scale and microm-
eter scale readings are not
zero.
MISSILE SUBSYSTEM TEST CHECKOUT
PANEL
68. All lamps do not illuminate
Defective lamps
Replace lamps (Table 5-6).
when LAMP AND METER
TEST switch is held.
69. SIG DATA CONV lamp glows
a. ALIGN and ERROR levers in wrong
a. Place levers in correct position and/or
at end of self-test
position or tracker not aligned
perform tracker alignment
b. Checksight lamp defective
b. When performing tracker alignment
make certain checksight light is
visible. Replace lamp if necessary
and repeat subsystem checkout
procedures (Tables 2-12 and 5-6).
70. POWER SUPPLY lamp glows
Low power from vehicle
If vehicle engine is off, start engine,
at end of self-test
set idle speed to 750-rpm and
repeat subsystem checkout
procedures (Table 2-12).
71. TRACKER lamp glows at end of
Tracker not properly aligned
Perform tracker alignment procedure
self-test
checkout procedure.
NIGHT VISION SIGHT
72. No illumination of reticle
a. Weak or dead battery
a. Replace battery (B, Fig. 5-8).
b. Defective reticle lamp
b. Replace lamp (Table 5-6).
73. Weak or no illumination of
a. Objective lens or eyepiece lens dirty
a. Clean lenses.
image intensifier tube or
or fogged.
image blurred.
b. Objective lens out of focus
b. Adjust lens focus (Table 2-11).
c. Eyepiece out of focus
c. Adjust eyepiece focus (Table 2-11).
d. Dead or weak battery
d. Replace battery (B, Fig. 5-8).
5-8