Section IV. HELMET SIGHT ASSEMBLY TROUBLESHOOTING

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.