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 183 of 590

5-9

TM 9-1240-401-34&P

5-11. GENERAL SUPPORT TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

LOCATION

CORRECTIVE ACTION

CAP ASSEMBLY

1. CAP (1) BINDS OR JUMPS.

Observe visually.

Replace damaged balls in cap (ref. para

5-17).

COUNTER ASSEMBLY

2. AZIMUTH COUNTER (2) AND RESET COUNTER (3)

DO NOT OPERATE.

Adjust azimuth and reset counter knobs.

Repair body (ref. para 5-17).

3. AZIMUTH COUNTER (2) AND RESET COUNTER (3)

ARE NOT LEGIBLE.

Observe visually.

Repair adapter assembly (ref. para 5-23).

4. DIFFERENTIAL GEAR ASSEMBLY NOISY WHEN

AZIMUTH KNOB (4) IS OPERATED.

Rotate knobs.

Repair differential gear assembly (ref.

para 5-23).

ELBOW ASSEMBLY

5. LENS (5) WILL NOT FOCUS.

Observe visually.

Repair elbow assembly (ref. para 5-19).

6. LENS (5) IS DAMAGED.

Observe visually.

Replace lens (ref. para 5-20).