C1 TM 9-6650-222-35
Table 4-1. Troubleshooting-Continued
Lowest
Probable cause
Corrective action
Malfunction
maintenance
category
2. Pressure cannot be main-
d. Replace faulty preformed
d. Faulty preformed packing
Depot
packing.
tained in body assembly
cell assembly 10513580.
10513599-Continued
e. Faulty sealing around prism
e. Remove. reseal, and replace
Depot
prism.
f. Faulty sealing around plug
f: Remove, reseal, and re-
DS
place plug.
g. Replace gasket 5330-912-
g. Faulty gasket 5330-912-
DS
4852
h. Cracked head or other major
h. Overhaul body assembly
Depot
10513599.
repair item.
3. Head assembly or body as-
a. Faulty catch(es) 1240-191
a. Replace catch(es) 1240-
DS
sembly out of alignment
or loose when installed.
b. Replace gasket.
b. Damaged or worn gasket
DS
sembly 6650-906-7941.
4. Periscope does not function
a. External 24-volt dc not
a. Check that power is prop-
o
when switch 5930-925-
erly connected and turned
properly connected.
3631 is turned on.
on.
b. Loose or defective plug
b. Tighten or replace plug
DS
1290-764-9178 (3J, fig.
1290-764-9178.
c. Tighten or replace switch
c. Defective switch 5930-925-
DS
5930-925-3631.
d. Replace power supply 1240-
d. Defective power supply
DS
e. Defective converter
e. Replace converter 1240-
DS
1240-878-7768 (3,
4-2