C1, TM 9-1240-318-35
Table 4-1. Troubleshooting - Continued
Lowest
Malfunction
Probable cause
Corrective action
maintenance
category
Poor or no reticle
a. Burned out lamp or defective
a. Replace lamp or batteries (para
DS
batteries in instrument light.
b. Reticle cell loose in housing.
b. Aline and secure reticle cell in
GS
c. Reticle not properly alined in
c. Aline reticle in cell and plumb
GS
cell.
a. Telescope do vetail not
a. Secure Telescope in mount by
DS
secured in mount.
locking clamping lever.
b. Dirt, nicks, or paint on
b. Clean and remove nicks or paint
DS
dovetail.
Reticle accuracy exceeds
Erector system improperly alined.
Aline erector system properly (para
GS
tolerances
4-2