ARMY TM 9-1240-379-34
MARINE CORPS TM 04332A-34
2-1. TROUBLESHOOTING INFORMATION. (cont)
TEST OR INSPECTION
TANK PERISCOPE (ALL MODELS)
1. LOSS OF BORESIGHT.
Make sure elevation and deflection knob assemblies are fully engaged with
If knob cannot be engaged, replace appropriate knob assembly.
assembly is properly seated.
Check for foreign matter around locating pads. Clean as
Check for damaged periscope latches or strikes. Replace
authorized parts (page 2-16, 2-27, or 2-39) as necessary.
If boresight capabilities are not restored, replace daylight body
assembly, infrared body assembly, or elbow assembly (Page
DAYLIGHT BODY ASSEMBLY
Step 1. Check for damaged or defective incandescent lamp (page 2-16).