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 181 of 590

TM 9-1240-401-34&P

5-8 DIRECT SUPPORT SYMPTOM INDEX

Troubleshooting

Procedure

(Page)

LAMP ASSEMBLY

Reticle is not illuminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

. . . .

5-7

AZIMUTH KNOB

Azimuth knob does not function correctly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.. 5-7

ELBOW ASSEMBLY

Lens is fogged or condensation is present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 5-8

5-9. DIRECT SUPPORT TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

LOCATION

CORRECTIVE ACTION

1.

2.

LAMP ASSEMBLY

RETICLE IS NOT ILLUMINATED.

Observe visually.

a.

b.

c.

Replace LED (1) (ref. para 5-14

or 5-15).

Replace lamp assembly (2) (ref. para

5-14 or 5-15).

Replace variable resistor (ref. para

5-14 or 5-15).

AZIMUTH KNOB

AZIMUTH KNOB (4) DOES NOT FUNCTION

CORRECTLY.

Rotate azimuth knob.

Replace

5-13).

azimuth knob (4) (ref. para

5-7