TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 5.1-10. DIRECT SUPPORT TROUBLESHOOTING MALFUNCTION TEST OR INSPECTION LOCATION CORRECTIVE ACTION LEVEL ASSEMBLY 1. LEVEL VIALS (1) HAVE UNEVEN OR NO ILLUMINATION WITH 24 VOLTS DC APPLIED. Observe visually in darkened area with 24 volts DC applied. a. Replace toggle switch (ref. para 5.1-14). b. Send to general support maintenance. 2. LEVEL VIAL (1) HAS NO BUBBLE OR IS CRACKED. Observe visually. Replace level vial (ref. para 5.1-17). COVER ASSEMBLY 3. COUNTER DIALS (2) HAVE UNEVEN OR NO ILLUMINATION WITH 24 VOLTS DC APPLIED. Observe visually in darkened area. a. Replace overlay assembly (ref. para 5.1-16). b. Replace electrical wiring or contacts (ref. para 5.1-16). Change 1 5.1-11