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Table 4.2 HSS Test cont'd - TM-9-1270-212-14-P0180
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TM-9-1270-212-14-P Fire Control Subsystem Helmet Directed XM128 P/N 2277716-00 NSN 1270-00-122-9449 Manual
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Table 4-3. Helmet Sight Assembly Test
TM 9-1270-212-14&P
Section IV. HELMET SIGHT ASSEMBLY TROUBLESHOOTING
c. Manually position the eyepiece to the down position.
4-15. General.
Adjust the eyepiece vertically and laterally to desired
position (figs. 2-14 and 2-1 5).
This section provides troubleshooting procedures for the
helmet sight assembly by using the test set. The tests are
d. P e r f o r m  the test-set preliminary procedures
performed on the bench or in the helicopter with the
helmet sight assembly electrically isolated from the
helicopter.
e. Connect helmet sight assembly electrical connector
A1P1 to the J4 HELMET receptacle on the test set.
4-16. Helmet Sight Assembly Checkout Procedures.
f. Set the POWER switch to ON-60 HZ if a 60-Hz power
a. Verify that the helmet sight assembly is installed on
source is used or to ON-400 HZ if a 400-Hz power source is
the SPH-4 helmet (paragraph 5-10,5-11, or 5-12).
used.
b. Place the helmet on the operator's head and fasten
g. Perform the procedures in table 4-3.
the chin strap.

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