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Maintaining and Servicing the Legend
Troubleshooting the Light Bar
This section provides troubleshooting assistance for common problems. If you
have any questions left unanswered, call the Federal Signal Service Department at
1-800-433-9132, 7 am to 5 pm, Monday through Friday (CT).
Table 14 Troubleshooting tips
Problem
The light bar does not
light
An LED module does
not light
Half of an LED module
does not light
48
Corrective Action
•
Check that the light bar's red power line (+BAT) and the black ground- power line (–GND)
are properly connected to a good, fully charged 12-volt battery.
•
Ensure that the ground connection from the light bar controller to the aluminum extrusion
is good.
•
Check that the CAT5 cable is connected to the Serial Interface Module (J1) and there are
no damaged pins in the sockets.
•
Try a new CAT5 cable.
•
Check the connections on the Serial Interface Module:
•
the black wire and the black/white wire are connected to ground (–GND)
•
the white wire is connected to 12 Vdc
•
a MODE wire has 12 Vdc
•
Check the position of Switch 1 on SW-2 in the Serial Interface Module. If Switch 1 is
down (ON), ensure that the ENABLE control wires (green/white and orange/black) have
12 Vdc applied.
•
Check the positions of the DIP switches in the Serial Interface Module. See Table 10 on
page 21.
•
Check the fuses on the mainbar controller (Figure 19 on page 46).
•
Swap the LED board with good board to see if the board is bad.
•
Check the connections of the cable that goes from the light bar controller to the LED
ROC board.
•
Ensure that STEADY BURN switches on the light bar controller (SW3 PSR for the
passenger side and SW3 DSR on the driver side) are set correctly (Figure 19 on page
45).
•
If it is a rear module, check the SignalMaster connections.
Replace the ROC board that the LED is on.
Legend LGD and Legend LPX Light Bars
Federal Signal www.fedsig.com
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