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PAGE 44 — MLT25 SERIES LIGHT TOWER • OPERATION MANUAL — REV. #0 (11/28/12)
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
1. Make sure that lamp #1 power cable is plugged into
the J1 connector on the T-Bar assembly.
2. Make sure that lamp #2 power cable is plugged into
the J2 connector on the T-Bar assembly.
3. Make sure that lamp #3 power cable is plugged into
the J3 connector on the T-Bar assembly.
4. Make sure that lamp #4 power cable is plugged into
the J4 connector on the T-Bar assembly.
5. Make sure that lamp #5 power cable is plugged into
the J5 connector on the T-Bar assembly.
6. Make sure that lamp #6 power cable is plugged into
the J6 connector on the T-Bar assembly.
Starting
1. Start the generator and verify that there are no
abnormal sounds.
2. Turn CB1 thru CB3 circuit breakers, depending on what
voltage is selected, (see Table 3) to the ON position.
3. Wait a few minutes and determine which lamp is not
igniting.
4. If one of the lamps is OFF, disconnect its power cable
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.
5. If the lamp still does not ignite after plugging it into a
working receptacle (120 VAC present), then the lamp
is defective and has to be replaced.
6. If the lamp ignites after plugging it into a working
receptacle, continue with step 7.
7. With the voltmeter set to the AC position, connect the
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.
TROUBLESHOOTING
8. Connect the positive lead of the voltmeter to the output
side of the circuit breaker where the lamp was originally
OFF and observe that 120 VAC is present. Make sure
circuit breaker is ON.
9. If no output voltage is present, the circuit breaker is
defective and needs to be replaced.
10. If the correct output voltage is present then it can be
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
1. Remove the power cable from the generator, and make
sure that no voltage is being supplied to the ballast
compartment.
2. Remove the four screws securing the ballast cover,
and remove cover.
3. Make sure to discharge the ballast capacitor.
4. Remove the defective ballast, taking care to guard
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.