TB 43-0149
APPENDIX B
TROUBLESHOOTING, AIRFIELD RUNWAY SETS
TROUBLE
PROBABLE CAUSE
REMEDY
1.One light burns dim,
1. Loose connection be
1. Tighten connection.
or does not burn
tween fixture lead and
at all.
transformer second-
ary lead.
2.
Loose lamp.
2.
Tighten lamp.
3.
Burned out lamp.
3.
Replace lamp.
4.
Faulty transformer.
4.
Replace transformer.
5.
Faulty fixture lead.
5.
Replace fixture.
2. All lights burn dim or do
1.Power supply.
1. Turn the voltage regulator control on the
not burn at all
generator to the position for maximum volt-.
age and check the voltmeter reading. It
should
.
be approximately 120 volts. If the voltmeter
reads below this value, refer to the appropriate
generator technical manual for generator
troubleshooting instruction. A correct reading
on the voltmeter indicates that the current
regulator may be at fault. To check the
regulator, turn the regulator control switch to
the OFF position.
Disconnect the output
connectors from the lighting circuit and
connects an alternating current ammeter of
proper range directly across the output. Refer
to the appropriate generator technical manual
for ammeter access instructions. Adjust the
regulator for full brightness. If the ammeter
reads approximately 6.6 amperes, the
regulator is operating satisfactorily and the
probable cause will be found in item number 2
below. If the ammeter reads low or high or
fails to read at all, check the leads from the
generator for damage and tighten all
connections. If the ammeter still reads an
incorrect value, check the appropriate current
regulator
manual
for
troubleshooting
instructions
2. Open circuit caused
2. Inspect the entire circuit for loose connec-
by one of the following
:
tions, faulty connectors, faulty transformers,
and/or damaged cables.
WARNING
a.
Loose connector.
The open circuit voltage of the regulator and
b.
at the ends of a broken cable can be in excess 'j
Faulty connector.
c.
Faulty transformer.
of 300 volts. Handle and repair portions of the
d.
Damaged cable.
series circuit proper in the voltage off condition
only.
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