C 1, TM 9-6650-221-35
CHAPTER 4
TROUBLESHOOTING
Section I. GENERAL
Caution: Operation of materiel without a
4-1.
Purpose
preliminary examination can cause further damage
Troubleshooting is a systematic isolation and remedy of
to a faulty component.
Exercise care during
malfunction and defective components by means of
troubleshooting, to avoid further damage.
symptoms and tests. Close adherence to the procedure
covered herein will materially reduce the time required to
4-2.
General
locate trouble and restore the equipment to normal
operation.
For
troubleshooting
procedures
performed
by
organizational maintenance, refer to TM 9-2350230-12.
Table 4-1. Troubleshooting
Malfunction
Probable cause
Corrective action
Lowest
maintenanc
e category
1. Poor visibility
Chipped, scratched or otherwise
Replace optical instrument
Depot
damaged
optical
instrument
window (para 5-7).
window 6650-902-9741 (3, fig. 5-
2. Pressure
cannot
be
a. Defective
valve
assembly
a. Disassemble and repair
DS
maintained
in
body
8201751 (7. fig. 5-2).
vale assembly (para 5-9)
assembly 10513620
b. Faulty machine thread plug
b. Replace machine thread
DS
5365684-4401 (8. fig. 5-2) or
plug and/or gasket i
gasket 5330-683-9573 (19
c. Faulty sealing around optical
Remove. replace. and reseal
DS
instrument window 6650-902-
optical
instrument
9741 (3. fig. 5-2).
window (para 5-7).
3. Head assembly does not
Faulty catch(es) 1240-191-9213 (6,
Replace catch(es) para 5-8).
DS
attach securely to mount
assembly 6650906-7944.
Section II. TROUBLESHOOTING PROCEDURES
4-3.
General
4-4.
Troubleshooting
The troubleshooting procedure described in this section
is one of determining the cause of the malfunction and
taking the necessary action.
4-1
