TM
3-4240-309-20&P
Section V TROUBLESHOOTING
2-8. SCOPE.
c. Direct support maintenance procedures are
found in the appropriate technical manuals listed in
a. This section contains troubleshooting
information for locating and correcting most of the
operating troubles which may develop in your
NOTE
collective protection equipment. A symptom is
When measuring voltage at the power
provided for each malfunction that iS likely to occur.
distribution unit (PDU), TP #10 is ground.
Each symptom is followed by a troubleshooting
procedure to isolate the fault to a replaceable
2-9. TROUBLESHOOTING PROCEDURES.
component.
a. Perform functional test first. Then, use the
b. This manual cannot list all possible
symptom index for quick access to the
malfunctions that may occur. If a malfunction is not
troubleshooting procedures.
listed (except when malfunction and cause are
b. The following describes the use of the
obvious) or is not corrected by the troubleshooting
troubleshooting procedures.
procedure, notify your supervisor.
WARNING
High voltage is used to power this equipment. Before removing or installing power cable. be sure that
POWER switch on control module is set to OFF and power source is shut down to avoid personal
injury or loss of life.
SYMPTOM INDEX
Troubleshooting
Procedure Page
1.
MASK switch/indicator light flashing and/or warning horn sounding . . . . . . . . . . . . . . . . . . . . . 2-16
Protective entrance LOW PRESSURE switch/indicator lights on . . . . . . . . . . . . . . . . . . . . . . . . 2-30
2.
No power indication (all indicator lights do not illuminate when pressed to test) . . . . . . . . . . . . 2-42
3.
4.
Protective entrance LOW PRESSURE switch/indicator lights will not come on . . . . . . . . . . . . . 2-48
5.
CHANGE FILTER indicator lights with clean filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-54
6.
CHANGE FILTER indicator light does not light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55
7.
OCCUPIED and PURGE indicator lights do not operate properly . . . . . . . . . . . . . . . . . . . . . . . 2-57
8.
INDICATORS circuit breaker trips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60
9.
Protective entrance dome light does not come on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63
DUST FAN DEFECT indicator light illuminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65
10.
DUST FAN DEFECT indicator light does not illuminate and dust fan is not running . . . . . . . . 2-66
11.
2-15