TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 248 of 590

TM 9-1240-401-34&P

5.1-12. GENERAL 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 LED (ref. para 5.1-22).

b.

Replace electrical wiring or contacts (ref.

para 5.1-22).

c.

Replace components of electrical receptacle

(ref. para 5.1-22).

CORRECTION KNOB ASSEMBLY

2.

CORRECTION KNOB (2) BINDS.

Check for defective correction counter.

Replace correction counter assembly (ref. para

5.1-19).

COUNTER ASSEMBLY

3.

COUNTER NUMBERS (3) ARE NOT IN HORIZONTAL

ALINEMENT.

Step 1.

Observe visually for defective counters.

Replace counter assembly (ref. para 5.1-19).

Step 2.

Check for incorrectly assembledcounter

assembly.

Reassemble counter assembly correctly (ref.

para 5.1-20).

5.1-14

Change 1