C 10, TM 9-2350-230-12
TABLE 2-9. OPERATION OF M119 OR M127 TELESCOPE, XM44 SERIES PERISCOPE,
AND ARMAMENT BORESIGHT PROCEDURE - Continued
STEP
PROCEDURE
FIG/ITEM
OPERATING PROCEDURES FOR XM44 SERIES PERISCOPE
Continued
17
Turn off or reduce intensity of all internal lights (dome lights, panel
lights, etc. ). This will improve gunner's viewing ability.
18
Place filter of periscope in the dark position.
19
Deleted.
20
Open ballistic cover.
21
Place periscope ON/OFF switch to the ON position.
2-26/ 6
NOTE. If a green flash of light is seen briefly and the image tube
goes out, the exterior light level is too high for operating the peris-
cope.
22
Adjust headrest.
23
Select filter which provides the best lighting condition of the image
tube without cutting it off.
24
Turn focusing knob-to infinity position (max. ccw).
25
Adjust reticle light intensity control clockwise for proper illumina-
tion of reticle pattern. Proper illumination is obtained
when reticle is barely visible.
25.1
Slip boresight knobs to position "1".
26
While observing reticle through eyepiece of periscope, pull out
diopter knob and adjust setting until reticle appears with maximum
sharpness.
27
Set periscope on a distant visible target. Rotate focusing knob until
target is sharply defined. Re-adjust diopter setting if required.
NOTE 1. Focus must be adjusted for each change of target range.
NOTE 2. In the event vehicle power is lost, switch periscope
ON/OFF switch to emergency power position. In the emergency
position, the reticle should be used as little as possible to conserve
battery power.
NOTE 3. Turn reticle pattern off for ultimate performance in
scanning operation.
When periscope is not in use:
28
Turn periscope ON/OFF switch to OFF position.
29
Turn filter to DARK (XM44) or OFF (XM44E Series)
30
Close ballistic cover.
BORESIGHTING GUNNER'S XM44 SERIES PERISCOPE
NOTE. XM44 Series periscopes are boresighted and zeroed at a
distance of 1200 meters.
CAUTION: Use periscope boresight aid (10516830) when
boresighting in daylight. Use dark position filter to prevent exces-
sive light from damaging internal components when boresighting or
at all times when periscope is not in use.
31
Pull and turn elevation and azimuth boresight knobs until reticle is
2-26/24, 26,
aligned with aiming point.
32
Turn slip scales on elevation and azimuth boresight knobs to posi-
tion "1".
2-38
