59
LIGHT FIXTURE TROUBLESHOOTING (cont’d)
SYMPTOM CAUSES CORRECTIVE ACTION
LAMP STARTS Defective Lamp Lamp may glow for extended period of time. Replace after
SLOWLY (ARC checking voltage and ballast.
DOES NOT
STRIKE WHEN
SWITCH IS
FIRST TURNED ON)
CIRCUIT Short circuit or ground Checking wiring against diagram. Check for shorts or ground.
BREAKER
TRIPS ON LAMP
START-UP
LAMP LIGHT Normal lamp depreciation Replace lamp
OUTPUT LOW
Dirty lamp or fixture Clean lamp and fixture
Defective ballast Interchange ballast plugs in generator enclosure. If lamp
returns to normal light output, replace ballast. Check for
swollen capacitors, charred wiring, core and coil, or other
signs of excessive heat.
Wrong Voltage Check voltage at ballast input. Voltage should be within 10%
of nameplate rating. Check wiring connections for voltage
loss. Check socket contact point.
Improper ballast Check ballast nameplate against lamp data.
LAMP COLORS Normal lamp depreciation Lamp color and brightness decreases and colors change
DIFFERENT slightly as lamps age. Spot replacement with new lamps may
cause noticeable differences in lamp colors. Group replace-
ment minimizes color differences.
Dirty fixture Dirty fixtures will cause lamps to appear different in color.
Clean fixture.
Wrong lamp Check data on lamps, which appear different in color.
Replace with correct color lamp.
ARC TUBE Over voltage from Check voltage at ballast. Check for current or voltage surges.
DISCOLORED power supply Check for shorted capacitors and replace if defective.
OR SWOLLEN
Improper ballast Lamp operated on ballast designed for higher wattage lamp.
Check ballast nameplate against lamp data.
