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Section V. TROUBLESHOOTING - TM-9-1270-212-14-P0135
Up
TM-9-1270-212-14-P Fire Control Subsystem Helmet Directed XM128 P/N 2277716-00 NSN 1270-00-122-9449 Manual
Next
Replacement of Lamp Assembly cont'd
TM 9-1270-212-14&P
(2) Insure that the pilot and gunner helmet sight
b. Electrical Eyepiece Retraction Test. Perform the
assemblies are properly attached to their respective linkage
eyepiece retraction test as follows:
assemblies, and that the helmet sight cable connectors for
(1) Insure that the MASTER ARM switch on the
both pilot and gunner are connected.
pilot armament control panel is in the STBY position.
(3) For the gunner helmet sight assembly, place the
HSS RETICLE TEST (HSS RTCL TEST or HSS LAMP
(2) Set the MODE SELECT switch on the TOW
TEST) switch on the gunner armament control panel to
control panel (fig.2-9) to the STBY TOW, ARMED MAN,
TEST (or LAMP TEST) and insure that the reticle remains
or ARMED AUTO position.
lighted. If the reticle goes out, refer to paragraph 3-12 for
procecdures to replace the failed lamp assembly.
(3) Momentarily move the ACQ TRK STOW switch
(fig. 2-5) to ACQ and release it to TRK to insure that the
NOTE
eyepiece automatically retracts (rotates upward) out of the
field of view.
If the reticle light goes out while performing
step (3) check the position of the magnet in
(4) Leave the ACQ TRK STOW switch in the TRK
the receptacle before replacing lamp assembly.
position.
The white alignment dots may have to be
offset slightIy for reticle to light.
(5) Manually return the eyepiece to the operating
position.
(4) For the pilot helmet sight assembly, place the HS
RTCL TEST (or HSS RTCL TEST) switch on the pilot
(6) Press the PHS ACQ switch (fig. 2-5) and observe
armament control panel to the TEST position and insure
that the gunner's eyepiece automatically retracts.
that the reticle remains lighted. If the reticle goes out, refer
to paragraph 3-12 for procedures to replace the failed lamp
(7) Manually return the eyepiece to the operating
assembly.
position.
NOTE
If a failure occurs in any part of the eyepiece retraction
test, notify higher maintenance personnel.
If the reticle light goes out while performing
step (3), check the position of the magnet in
the receptacle before replacing lamp assembly.
The white alignment dots may have to be
offset slightly for reticle to light.
Section VI. MAINTENANCE OF HELMET SIGHT ASSEMBLY
3-11. General.
3-12. Replacement of Lamp Assembly (fig. B-3).
The maintenance performed on the helmet sight
a. Remove machine screw (9) holding lamp cover (10)
assembly at this level consists of
to the sight assembly.
a Cleaning the eyepiece
b. Carefully slide lamp cover (10) from sight housing
(36).
b. Cleaning the lens assembly
c. Hold component board assembly (35) in place with a
c. Replacing the lamp assembly.
small screwdriver and remove lamp assembly (11).

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