Troubleshooting
34
MLT4060-80M/K Operating Manual
10454 O
TROUBLESHOOTING THE LIGHTS
Table 2 - Troubleshooting the Lights Guide
Problem
Possible Cause
Solution
Mast Lights Off but Bal-
last Indicators on Con-
trol Panel are On
Mast light too hot
Faulty bulb connection
Bulb broken
Faulty junction box con-
nections
Faulty coil cord connection
Allow light to cool 10-15 minutes before restarting.
Check bulb is tight in socket.
Check for broken arc tube or outer bulb jacket, broken or loose
components in bulb envelope or blackening/deposits inside tube.
Check connections inside mast junction box and each mast light
housing/socket.
Check mast coil cord for damage and check cord connections
inside control box.
Mast Lights Off and Bal-
last Indicators on Con-
trol Panel are Off
Faulty control box connec-
tions
Generator output incorrect
Low transformer output
Check connections inside control box and inside each ballast box.
Check incoming voltage to ballast by checking available voltage
on GFCI receptacle. Incoming voltage should be 120V +/-5V. If
voltage is incorrect, engine speed may need to be adjusted or
generator may require service.
Voltage from transformer should read approximately 400VAC as
light “strikes” (induces an arc), the drop and slowly rise back up to
stabilize at 240-260VAC.
On quick disconnect models, measure across junction box termi-
nals when the light is unplugged.
On hard wired models, remove mast junction box cover, and
insert wire probes into connector blocks for light and ground.
If proper voltage is not achieved, perform capacitor check to
determine if the capacitor or coil needs to be replaced.
Mast Lights On but the
Light Output is Low
Dirty fixture and/or lens
Bulb worn due to normal
use
Faulty connections
Generator output incorrect
Low transformer output
Clean reflective surface inside fixture and both inside and outside
surface of glass lens. Use mild soap and water to clean lens.
Other chemicals may have an adverse effect on the glass.
Replace bulb.
Check the mast coil cord, mast junction box and mast light con-
nections.
Check incoming voltage to ballast. Incoming voltage should be
120V +/-5V. In voltage is incorrect, engine speed may need to be
adjusted or generator may require service.
Voltage from transformer should read approximately 400VAC as
light “strikes” (induces an arc), the drop and slowly rise back up to
stabilize at 240-260VAC.
On quick disconnect models, measure across junction box termi-
nals when the light is unplugged.
On hard wired models, remove mast junction box cover, and
insert wire probes into connector blocks for light and ground.
If proper voltage is not achieved, perform capacitor check to
determine if the capacitor or coil needs to be replaced.
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