Multi Tech Equipment MLT20DCA6 Lamp Troubleshooting continued, Symptom, Possible Cause, Solution

		TROUBLESHOOTING
	Table 5. Lamp Troubleshooting (continued)
Symptom	Possible Cause	Solution
Lamp starts slowly
(ARC does not strike	Defective Lamp?	Lamp may glow for extended period of time. Replace after
when switch is first		checking voltage and ballast.
turned on)
Circuit breaker trips on	Short Circuit or Ground?	Check wiring against diagram. Check for shorts or ground.
lamp start-up
	Normal Lamp	Replace Lamp.
	Depreciation?
	Dirty Lamp or Fixture?	Clean lamp and fixture.
		Interchange ballast plugs in generator enclosure. If lamp
Lamp light output low	Defective Ballast?	returns to normal light output, replace ballast. Check for
		swollen capacitor, charred wiring, core and coil, or other signs
		of excessive heat.
		Check voltage at ballast input. Voltage should be within 10%
	Wrong Voltage?	of nameplate rating. Check wiring connections for voltage
		loss. Check socket contact point.
	Improper Ballast?	Check ballast nameplate against lamp data.
		Lamp output and brightness decreases and color changes
	Normal Lamp	slightly as lamps age. Spot replacement with new lamps
	Depreciation?	may cause noticeable differences in lamp colors. Group
Lamp colors different.		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.
	Over Voltage from Power	Check voltage at ballast. Check for current or voltage surges.
ARC tube discolored or	Supply?	Check for shorted capacitors and replace if defective.
swollen.	Improper Ballast?	Lamp operated on ballast designed for higher wattage lamp.
		Check ballast nameplate against lamp data.
		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 Damaged?	Lamp too firmly in socket or scoring of glass where socket
Short lamp life.		inadvertently touches the lamp bulb. Look for broken arc tube
		or loose metal parts. Replace lamp. (Bulb leads will cause
		oxidation of metal parts.)
		Ballast nameplate data should agree with lamp line voltage
	Improper Ballast?	and lamp use. If improper ballast is used, the lamp life will be
		shortened. A mismatch may also cause the ballast to fail.

MLT20 SERIES LIGHT TOWER • operation manual — rev. #0 (01/18/13) — page 43