© ADB Airfield Solutions All Rights Reserved
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2.5 Troubleshooting
L852A-D, J, K and ICAO Straight ITCF
2.5.1 Troubleshooting Tips
This guide covers only the most common problems. For additional help, contact your local
ADB Airfield Solutions representative or the ADB service department.
Table 3:
Troubleshooting Guide
WARNING
Read the instructions in their entirety before starting troubleshooting.
USE EXTREME CAUTION WITH ENERGIZED CIRCUITS AS LETHAL
VOLTAGES ARE MORE LIKELY WHEN A FAULT IS PRESENT.
Reference “Mechanical
Requirements” on page 9 and
“Electrical Requirements” on
page 11 for the
recommendations when
installing or repairing of in-
pavement lights.
Problem
Possible Cause
Corrective Action
LED not
energizing
LED defective
ITEL PCB defective
Replace Optical LED assembly. Refer to “Testing an LED
assembly” on page 22.
Replace the PCB, see “Installing Power Supplies, Heaters, and
Thermostats” on page 25.
Loose or broken
contacts
Tighten or replace, then verify that the fixture is sealed.
Moisture inside
assembly causing
current leakage
Open the light assembly. Clean, dry and inspect the assembly.
Replace the O-ring and verify the fixture is sealed.
Fixture wires pinched
between base can
and fixture
If both wires are pinched between the fixture and the base can,
the isolation transformer is shorted and the LED will not
energize. Replace fixture leads.
Refer to “Replacing the Cord Set ” on page 24.
•
Use care when remounting fixture on the base can to ensure that the
wires do not get pinched.
Defective isolation
transformer
Check transformer output current with a true RMS meter using
a clamp-on current probe. This can be done by placing a short
across the transformer secondary and verifying that the
secondary current is present.
•
For 6.6A/6.6A transformers, the primary and secondary currents
should match.
•
For 20A/6.6A transformers, the secondary current should be
one-third of the primary current.
If the secondary current is too low or zero, replace the isolation
transformer.
Defective remote
control device
Consult the remote control device’s instruction manual.
LED not turning
on at normal
level
Continuity to LED
incorrect or PCB
failed
Check that the LED is connected correctly. Replace power
supply or internal wiring.
Isolation transformer
secondary current
incorrect
Check transformer current with a true RMS meter using a
clamp-on current probe. This can be done by placing a short
across the transformer secondary and verifying that the
secondary current is present.
•
For 6.6A/6.6A transformers, the primary and secondary currents
should match.
•
For 20A/6.6A transformers, the secondary current should be one-
third of the primary current.
If the secondary current is too low or zero, replace the isolation
transformer.
Wrong fixture
installed
Check the label on the bottom of the fixture. Replace if
necessary.
Distorted light
beam output
Broken, damaged or
wrong prism installed
Check parts list and install correct prism.
