TM 55-4920-244-14
i. If galvanometers does not deflect with
3-17. Troubleshooting.
switch SW-4 in
position, place switch SW-4
in
position.
diagnosing and correcting unsatisfactory opera-
j. Repeat h above.
tion of the tester. Each trouble symptom stated
is followed by a list of probable causes . The
k. If galvanometers does not deflect in
possible remedy recommended is described op-
either position of switch SW-4, refer to Table
posite the probable cause. The use of conven-
3-2 to locate defects in egt indicator circuit.
tional troubleshooting and corrective methods
l. Place switch SW-6 in MECH. ZERO
will enable organizational maintenance personnel
position.
to maintain the tester in operational readiness.
In table 3-2, assume that the tester is properly
m. Disconnect egt indicator check adapter
connected to a 110-volt, 50 to 400 Hertz, ac
from instrument cable.
power source and that cable connections, switch
n. Disconnect instrument cable from con-
positions, etc, have been accomplished in accord-
nector P-3.
ance with paragraphs 2-5 through 2-18.
o. Properly stow instrument cable and egt
NOTE
indicator check adapter in cable storage compart-
ment.
Always recheck test setup
thoroughly before assum-
p. Secure tester after operation in accord-
ing the tester is at fault.
ance with paragraph 2-14.
Table 3-2. Troubleshooting
Malfunction
Probable cause
Corrective action
Entire tester circuit inop-
a. Check power source and inlet
a. No input voltage.
perative with power source
cable.
connected switch SW-1 in
b. Both fuses blown.
b. Replace fuses (4-35).
any position except OFF). c . Defective power inlet cable.
c. Replace power inlet cable.
