TM 5-6675-250-10
3-2. TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRONIC CONTROL UNIT (Continued)
d. Check to ensure that the plumbing pointer is still over the fixed refer-
ence point.
e. Tighten each of the three hold-down clamps on the tripod.
Step 2. Check to see if LATITUDE select switch is at the proper position.
a. If switch position is not correct, place to position corresponding to
applicable latitude of operation as shown below.
0-15
degrees
0
15-30
degrees
25
40
30-45
degrees
45-55
degrees
50
55-63
degrees
60
65
63-67
degrees
70
67-73
degrees
73-75
degrees
75
Step 3. Check for defective READ AZIMUTH indicator lamp,
a. Unscrew the plastic lens from the indicator lamp assembly.
b. Visually inspect lamp for a burned out filament. If filament is defec-
tive replace with a new lamp.
c. Place the new lamp in the socket of the lamp assembly. Screw the
plastic lens in place over the lamp and tighten the plastic lens finger
tight.
Step 4. Check for a defective GRU.
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.
3-8
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