F-Range Type L-850C Style 3 Inset Lights
Troubleshooting
2006 ADB Airfield Solutions, Incorporated
96A0285D
Page 5-2
All rights reserved
Issued 04/13
Troubleshooting procedures for the F-Range inset lights are
contained here.
Problem Possible
Cause
Corrective
Action
1. Lamp not
energizing
Defective lamp
Replace lamp and film disc cutout (if
used). Refer to
Replacing
Lamp
in the
Maintenance
section.
Loose or broken contacts
Tighten or replace.
Moisture inside assembly causing
current leakage
Open up light assembly. Clean, dry, and
inspect light assembly. Replace O-ring.
Defective isolation transformer
Check transformer output current with
meter.
2. Lamp not turning
on at normal level
Continuity incorrect
Check lamp filament and wiring for
continuity.
3. Lamp output
distorted
Broken or damaged lens
Replace lens.
4. Improper color
Filter broken
Replace filter bracket assembly.
Filter bracket broken
Replace filter bracket assembly.
5. Short lamp life
Current too high
Check constant current regulator and
isolation transformer.
Water in assembly
Inspect prism. Open light assembly.
Clean, dry and inspect light assembly.
Replace O-ring.
Defective lamp
Replace lamp and film disc cutout (if
used). Refer to
Replacing
Lamp
in the
Maintenance
section.
NOTE:
Lamp interior will have a white
powdery appearance if air has entered
through a hole or crack.
Overvoltage
Check to see if lamp has black burns. If
so, check isolation transformer output
with meter. Replace isolation
transformer, if defective.
6. Distorted light
beam output
Cracked or damaged lens
Replace lens.
7. Water inside optical
chamber
Damaged or missing lens seals or top
cover O-ring
Replace both lens seals. Replace top
cover O-ring.
Cut or nick on L-823 cordset
insulation that exposes wire
Replace insulation.
2.
Troubleshooting
Procedures