C1, TM 9-6650-222-35
CHAPTER 4
TROUBLESHOOTING
Section I. GENERAL
4-1. Purpose
liminary examination can cause further damage
to a faulty component. Exercise care during
Troubleshooting is a systematic isolation and re-
troubleshooting, to avoid further damage.
medy of malfunctions and defective components by
means of symptoms and tests. Close adherence
4-2. General
to the procedures covered herein will materially
For troubleshooting procedures performed by or-
reduce the time required to locate trouble and
ganizational maintenance, refer to TM 9-2350-
restore the equipment to normal operation.
230-12.
Caution: Operation of materiel without a pre-
Section II. TROUBLESHOOTING
4-3. General
4-4. Troubleshooting
The troubleshooting procedure described in this
section is one of determining the cause of the mal-
function and taking the necessary corrective
action.
Table 4-1. Troubleshooting
Lowest
Malfunction
Probable cause
Corrective action
maintenance
category
a. Disassemble and inspect
Depot
a. Cracked or damaged lens,
1. Poor field-of-view.
the optical components of
prism, or filter in binocu-
head assembly 10513599.
lar tube of head assembly
10513599.
b. Replace image converter
DS
b. Faulty image converter
electron tube 5960-082-
electron tube 5960-082-
3326.
3326 (3, fig. 5-8).
c. Purge charge and body
assembly 10513599 para
lens.
Note. See also trouble 2 below since lack of
5-13).
nitrogen gas may be the result of a leak-
ing seal.
DS
a. Disassemble and repair
a. Defective valve assembly
2. Pressure cannot be main-
valve assembly 8201751
8201751 (4, fig. 5-2).
tained in body assembly
(4, fig. 5-2)
10513599.
b. Replace machine thread
DS
b. Faulty machine thread plug
plug or gasket (para 5-9).
5365-684-4401 (5, fig.
9573 (6, fig. 5-2).
c. Replace faulty preformed
Depot
c. Faulty preformed packing
packing
(3, fig. 5-13) around
housing 10513625.
4-1
