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TROUBLESHOOTING PROCEDURES COUNTER BOX ASSEMBLY -820360137
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TM-9-1240-375-34-P Quadrant Fire Control: M17 (1290-01-037-3883) and M17A1 (1290-01-515-8260); Mount Telescope and Quadrant: M171 (1240-01-039-7273) Manual
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Table 1. Troubleshooting Procedures. - continued -820360139
TM 9-1240-375-34&P
0034 00
COUNTER BOX ASSEMBLY - Continued
Table 1. Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1
2
3
0
0
1 fc 0 4 5
Check cover assembly.
Repair cover assembly (WP
1. AZIMUTH COUNTER
COVER (1) DOES NOT
REMAIN OPEN OR
CLOSED.
2. COUNTER BOX
1. Check for moisture in counter
Purge and charge with dry
WINDOWS (2) ARE
box.
nitrogen. Refer to
FOGGED OR HAVE
TM 750-116.
2. Check for loose purging valve
Tighten purging valve stem or
stem or relief valve on counter
relief valve.
box.
3. COUNTER DIALS (3)
Observe visually in darkened
1. Contact RSO immediately.
HAVE UNEVEN OR NO
area.
2. Perform wipe test under RSO
supervision.
0034 00-2

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