TM 3-4240-286-20&P
Section V. TROUBLESHOOTING
b. This manual cannot list all possible malfunc-
2-8. GENERAL.
tions that may occur, nor all tests or inspec-
a. This section contains troubleshooting infor-
tions and corrective actions. If a malfunction
mation for locating and correcting most of
is not listed (except when malfunction and
the operating troubles which may develop in
cause are obvious) or is not corrected by
your protective equipment. Each malfunc-
listed corrective actions, notify your super-
tion for an individual component, unit, or
visor.
svstem is followed by a list of tests or inspec-
.
tions which will help you to determine cor-
NOTE
lective actions to take. You should perform
When measuring voltage at the Power
the test/inspections and corrective actions in
Distribution Unit (PDU), TP #10 is
the order listed.
ground. PDU is actually installed upside
down, but is shown rightside up for clar-
ity.
2-9. TROUBLESHOOTING PROCEDURES.
a. Perform functional test first. Then use the
symptom index for quick access to the
troubleshooting procedures.
Troubleshooting
SYMPTOM INDEX
Procedure
Page
MASK light flashing and or warning horn sounding . . . . . . . . . . . . . . . . . . . . .2-12
1.
Protective entrance LOW PRESSURE lights on . . . . . . . . . . . . . . . . . . . . . . 2-22
2.
3.
No power indication (all indicator lights do not illuminate
when pressed to test) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
4.
Protective entrance LOW PRESSURE lights will not come on. . . . . . . . . . . . . 2-39
5.
CHANGE FILTER lights with clean filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45
CHANGE FILTER light does not illuminate . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
6.
7.
OCCUPIED AND PURGE lights do not operate properly . . . . . . . . . . . . . . 2-48
8.
INDICATORS circuit breaker trips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51
9.
Protective Entrance dome light does not come on . . . . . . . . . . . . . . . . . . . . . . 2-54
b. The following describes the use of the trou-
bleshooting charts:
2-11
