TM 1-1520-238-MTF
2-34
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
(2) FLTR SEL switch – Actuate to
each available filter. Verify
smooth switching of filters to
selected mode.
(3) AND – Observe for appropriate
data display. Verify range of
adjustment of AND rheostat
control.
(4) Optics check – Select each
available FOV. Observe
crosshair relationship to ‘‘Real
World Image’’. Slew turret using
thumbforce controller observing
for any excessive crosshair
rotation tendency.
NOTE
If display image is not reasonably upright, or
if excessive crosshair rotation occurs during
slewing, attempt to correct problem by per-
forming the pechan alignment procedure.
Refer to Chapter 4, paragraph C.
h. FLIR sensor check:
(1) Sensor select switch – FLIR.
(2) LVL and GAIN controls –
Adjust through full range of
authority noting effectiveness.
Adjust as required for optimum
imagery.
