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CHAPTER 2 DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS - TM-9-1240-311-340007
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TM-9-1240-311-34 Telescope Articulated: M127 (1240-437-1254) and M127A1 (M127E1) (1240-148-8539) and Hanger Assembly (1240-906-79451) Manual
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CHAPTER 3 REPAIR INSTRUCTIONS - TM-9-1240-311-340009
TM 9-1240-311-34
Table 2-2. Troubleshooting--Continued
Malfunction
Probable Cause
Corrective Action
a. Dirt on entrance or exit optics.
a. Clean surfaces of optics.
Image not clear or out of focus.
b. Diopter knob not adjusted to cover
b. Adjust knob. Para 3-7a and g.
a minimum span of +4.00 to
-4.00 diopters.
a. Defective contact or loose wire.
a. Check wire connection or replace
Reticle lamps fail to illuminate.
b. Lack of electrical power to reticle
b. Check electrical input into recep-
projector.
tacle assembly (9, fig. 3-11).
c. Lamps burned out.
c. Replace lamps (1, figs. 3-6 and 3-9).
d. Loose wire connections or defective
d. Check connection to receptacle as-
receptacle assembly.
sembly (9, fig. 3-11) or replace.
Telescope or reticle projector will not
Dirt preventing valve from closing or
Clean or replace valve stem. Para 3-6.
hold nitrogen charge.
faulty valve.
a. Gear teeth on filter assembly housing
a. Replace filter assembly (10, fig. 3-12).
Filters not fully positioned in optical path
when viewed through eyepiece
broken.
b. Operating mechanism not adjusted
b. Reposition gear (12, fig. 3-12) to
assembly.
properly.
mesh with gear at rear of the
filter assembly housing. Operate
handle to turn filter assembly to
extreme position in both directions
and adjust stops (set-screws) (1,
Excessive parallax between target and
Optical misalinement
Use parallax adjustment screw (5, fig. 3-
reticle.
13) to-correct image. Para 5-4.
Section III. GENERAL MAINTENANCE
Item Name
Specification
FSC
2-5. General Maintenance Procedures
Grease, Aircraft and Instrument
MIL-G-23827
9150
Gear and Actuator Screw
Refer to TM 9-254.
Grease, Pneumatic Systems
MIL-G-4343
9150
Sealing Compound (Adhesive Cur-
MIL-S-11031
8003
2-6. Other Materials Required
ing)
Sealing Compound (Noncuring)
8030
The following materials are used to perform repair
functions described in this manual.
2-2

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