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MLT25 SERIES LIGHT TOWER • OPERATION MANUAL — REV. #0 (11/28/12) — PAGE 43
TROUBLESHOOTING
Table 5. Lamp Troubleshooting (continued)
Symptom Possible Cause Solution
Lamp starts slowly
(ARC does not strike
when switch is first
turned on)
Defective Lamp?
Lamp may glow for extended period of time. Replace after
checking voltage and ballast.
Circuit breaker trips on
lamp start-up
Short Circuit or Ground? Check wiring against diagram. Check for shorts or ground.
Lamp light output low
Normal Lamp
Depreciation?
Replace Lamp.
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 capacitor, 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 different.
Normal Lamp
Depreciation?
Lamp output and brightness decreases and color changes
slightly as lamps age. Spot replacement with new lamps
may cause noticeable differences in lamp colors. Group
replacement 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 discolored or
swollen.
Over Voltage from Power
Supply?
Check voltage at ballast. Check for current or voltage surges.
Check for shorted capacitors and replace if defective.
Improper Ballast?
Lamp operated on ballast designed for higher wattage lamp.
Check ballast nameplate against lamp data.
Short lamp life.
Lamp Damaged?
Check for outer bulb cracks. If air enters outer bulb, arc tube
may continue to burn for 100 hours before failure. Check for
bulb cracks where glass meets the base due to tightening
Lamp too firmly in socket or scoring of glass where socket
inadvertently touches the lamp bulb. Look for broken arc tube
or loose metal parts. Replace lamp. (Bulb leads will cause
oxidation of metal parts.)
Improper Ballast?
Ballast nameplate data should agree with lamp line voltage
and lamp use. If improper ballast is used, the lamp life will be
shortened. A mismatch may also cause the ballast to fail.