TM 5-6675-250-10
3-2. TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
GYROSCOPIC REFERENCE UNIT (GRU) (Continued)
5. THEODOLITE AZIMUTH AND ELEVATION CONTROLS INOPERATIVE.
Check for defective theodolite.
a. Replace existing GRU with a GRU that is operable. If the system
operates correctly with the new GRU, this indicates the original GRU
was defective.
b. Replace a defective GRU with a new one by disconnecting and
connecting power cables.
c. Report a defective GRU to the next higher level of maintenance.
6. HAND-LAMP ASSEMBLY FAILS TO LIGHT WHEN HAND-LAMP SWITCH ON ECU PANEL IS
TURNED TO THE ON POSITION.
Check hand-lamp assembly for defective lamp.
Unscrew the lamp shield.
a.
Remove the lamp from the lamp base.
b.
Visually inspect the lamp for a burned filament. If the filament is bad,
c.
replace the lamp.
Install a good lamp in the lamp base.
d.
Screw the lamp shield into the assembly.
e.
3-14
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