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LT12 SERIES LIGHT TOWER • OPERATION MANUAL — REV. #12 (01/20/09) — PAGE 43
LAMP TROUBLESHOOTING GUIDE
Use the following procedure and wiring diagrams on the
next pages to determine which of the four lamps is not
functioning:
Connections
Make sure that lamp #1 power cable is plugged into 1.
the J1 connector on the T-Bar assembly.
Make sure that lamp #2 power cable is plugged into 2.
the J2 connector on the T-Bar assembly.
Make sure that lamp #3 power cable is plugged into 3.
the J3 connector on the T-Bar assembly.
Make sure that lamp #4 power cable is plugged into 4.
the J4 connector on the T-Bar assembly.
Starting
Start the generator and verify that there are no 1.
abnormal sounds.
Turn CB1 thru CB5 circuit breakers to the ON 2.
position.
Wait a few minutes and determine which lamp is not 3.
igniting.
If one of the lamps is OFF, disconnect its power cable 4.
and plug it into a receptacle that is known to be working.
DO NOT unplug a power cable from the T-Bar while
power is being supplied by the generator. Always turn
the circuit breaker OFF before unplugging a power
cable.
TROUBLESHOOTING
If the lamp still does not ignite after plugging it into a 5.
working receptacle (120 VAC present), then the lamp
is defective and has to be replaced.
If the lamp ignites after plugging it into a working 6.
receptacle, continue with step 7.
With the voltmeter set to the AC position, connect the 7.
negative lead of the AC voltmeter to any (neutral) white
wire on the junction terminal block. This block connects
all the neutral wires (white) in the system.
Connect the positive lead of the voltmeter to the output 8.
side of the circuit breaker where the lamp was originally
OFF and observe that 120 VAC is present. Make sure
circuit breaker is ON.
If no output voltage is present, the circuit breaker is 9.
defective and needs to be replaced.
If the correct output voltage is present then it can be 10.
assumed that the generator is working correctly and
the correct voltage (120 VAC) is being supplied to the
ballast. Then it can be assumed that the ballast for that
lamp is defective. Replace ballast.
Ballast Removal
Remove the power cable from the generator, and make 1.
sure that no voltage is being supplied to the ballast
compartment.
Remove the four screws securing the ballast cover, 2.
and remove cover.
Make sure to discharge the ballast capacitor.3.
Remove the defective ballast, taking care to guard 4.
against electrical shock when coming in contact with
the ballast and capacitor. The capacitor is known to
store an electrical charge, that when discharged could
result in a harmful shock. Make sure to discharge
capacitor.