Section IV. HELMET SIGHT ASSEMBLY TROUBLESHOOTING
c. Manually position the eyepiece to the down position.
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
(paragraph 4-1 3).
helmet sight assembly electrically isolated from the
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).
b. Place the helmet on the operator's head and fasten
g. Perform the procedures in table 4-3.
the chin strap.