TM 55-4920-410-13&P
Section Il. TROUBLESHOOTING
4-3. Scope.
b. This manual cannot list all possible malfunctions that
may occur or all tests or inspections and corrective ac-
tions. If a malfunction is not listed (except when malfunc-
a. This section contains troubleshooting or malfunction
tion and cause are obvious), or is not corrected by listed
information and tests for locating and correcting most of
corrective actions, you should notify higher level main-
the troubles which may develop in the Test Set. Each mal-
tenance.
function or trouble symptom for an individual component,
c. Table 4-2 lists the common malfunctions that you may
unit, or system is followed by a list of tests or inspections
find during the operation or maintenance of the Test Set
necessary for you to determine probable causes and cor-
or its components. You should do the tests/inspections and
rective actions for you to remedy the malfunction.
corrective actions in the order listed. -
Table 4-2. Troubleshooting (AVUM)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AN INDIVIDUAL PRESS-TO-TEST INDICATOR DOES NOT GO ON WITH THE
EXCEPTION OF Ø SEQ T1-2-3.
Step 1. Start APU.
Step 2. Press each press-to-test indicator except Ø SEQ T1-2-3. Indicators shall light when pressed,
a. If only one indicator does not light, replace lamp, paragraph 4-7.
b. If all lamps do not light, send test set to higher maintenance.
2. TEST SET Ø SEQ T 1-2-3 INDICATOR DOES NOT GO ON.
Step 1. Place GEN switch OFF then ON while holding TEST SET switch at RESET. Test set Ø
SEQ T1-2-3 indicator shall go on.
a. If indicator does not go on, press Ø SEQ T1-2-3 press-to-test. If lamp does not light,
replace lamp, paragraph 4-7.
b. If lamp goes on when press-to-test is pressed, send test set to higher maintenance.
4-2
