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TM 55-4920-412-13&P
CHAPTER 4
MAINTENANCE INSTRUCTIONS
Section I. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
4-1. General.
Preventive
maintenance
checks
and
services
consist of a visual inspection to be done at each
operation of the test set, operational check, any
troubleshooting required, and the repair required to
correct any malfunctions. If your equipment does
not operate, troubleshoot with proper equipment. Report
any deficiencies using the proper forms, see DA PAM
738-751.
4-2. Inspections.
Do inspections as shown in Table 4-1.
Table 4-1. Operator/Aviation Unit Maintenance Preventive Maintenance Checks and Services.
NOTE: Within designated interval, these checks are to be done in the order listed.
B - Before
D - During
A - After
Internal
C
Procedures
Item
Item to be
Check for and have repaired
Equipment is not ready/
No.
B
D
A
W
M
Inspected
or adjusted as necessary
available if:
1
Cables
Check for broken wires,
burned insulation, damage or
dirt in connectors
2
Controls and Switches
Positive action and freedom
of movement.
3
Indicator Lights
Check operation of lights.
Section II. TROUBLESHOOTING
4-3. Scope.
a.
This
section
contains
troubleshooting
or
malfunction information and tests for locating and
correcting most of the troubles which may develop in the
Bench Test Set. Each malfunction or trouble symptom
for an individual component, unit, or system is followed
by a list of tests or inspections necessary for you to
determine probable causes and corrective actions for
you to remedy the malfunction.
b.
This manual cannot list all possible malfunctions
that may occur or all tests or inspections and corrective
actions. If a malfunction is not listed (except when
malfunction and cause are obvious), or is not corrected
by listed corrective actions, you should notify higher level
maintenance.
c.
Table 4-2 lists the common malfunctions that
you may find during the operation or maintenance of the
Bench Test Set or its components. You should do the
tests/inspections and corrective actions in the order
listed.
4-1
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