L-850D/E Style 2 F-Range Series FAA Runway Threshold ...

F-Range Type L-850D/E Style 2 Inset Lights Troubleshooting
2. Troubleshooting
Procedures
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 and Filter and
Replacing Film Disc Cutout Assembly in the
Repair section.
Loose or broken contacts
Moisture inside assembly causing
current leakage
Tighten or replace.
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 Continuity incorrect Check lamp filament and wiring for
at normal level
continuity.
3. Lamp output
distorted
Broken or damaged lens Replace lens.
4. Improper color Wrong prism
Replace prism with one with correct color.
(see parts list)
Dichroic coating damaged Replace filter.
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 and Filter and
Replacing Film Disc Cutout Assembly in the
Repair 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.
Continued on next page
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