C 10, TM 9-2350-230-12
Table 5-1. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
XM44 SERIES PERISCOPE - Continued
56.Poor or no reticle illumination -
d. RETICLE LOGHT intensity control
d. Rotate RETICLE LIGHT rheostat knob
Continued
rheostat knob on control panel is in
(4, Fig. 2-26).
OFF position.
57.Daylight vision foggy
a. Dirt or fingerprints on optical
a. Clean with lens tissue.
elements.
b. Condensation
b. XM44: Refer to TM 750-116.
XM44E Series: Notify Organizational
Maintenance.
58.Foggy image in focal plane at
a. Dirt or fingerprints on optical ele-
a. Clean with lens tissue.
screen end of image intensi-
ments.
fier tube
b. Improper focus
b. Make initial adjustment of image at
image intensifier tube by turning
diopter knob. Make final focal
adjustment by turning focus knob.
c. Insufficient light in field of view
c. Resight periscope and/or main gun to
obtain more light in field of view.
d. Filter aperture not suitable for proper
d. Adjust filter lever to proper catch on
illumination of image
adapter (21, Fig. 2-26).
58. 1 Inability to focus
Image intensifier tube with related
Notify organizational maintenance.
parts improperly assembled and/
or installed.
59.Control panel indicator light
Defective lamp
Replace lamp (Table 5-6).
does not illuminate.
60.No image
a. Vehicle MASTER SWITCH turned off
a. Turn MASTER SWITCH on (Fig. 2-10).
b. Periscope ON/OFF switch in OFF
b. Turn to ON position (17, Fig. 2-26).
position.
61.Excesslve illumination In
Wrong filter aperture
Adjust filter lever to obtain proper
image
filter aperture (21, Fig. 2-26).
M119 OR M127 TELESCOPE
62.Poor definition of field of view
a. Eyepiece not focused correctly for
a. Rotate diopter knob until Image is
(image not sharp and clear)
operator
sharp and clear (2, Fig. 2-25).
b. Dirty external optics
b. Clean external optics.
c. Condensation
c. Refer to TM 750-116.
63.Poor or no reticle illumination
a. Improperly adjusted reticle light
a. Adjust reticle light rheostat
control
(1, Fig. 2-25).
b. Defective lamps
b. Replace lamps (Table 5-6).
c. Lack of electrical power to telescope
c. Check plugs and receptacle from
instrument to reticle dimmer box
and power source for proper mating.
64.No checksight light beam
Burned out or defective lamp
Replace checksight lamp (Table 5-6).
AZIMUTH INDICATOR
65.Scales not illuminated
a. Lack of electrical power
a. Check electrical connections
b. Defective lamp
b. Replace lamp (Table 5-6).
5-7
