23
Installation, Maintenance, and Service Manual
Federal Signal
www.fedsig.com
Maintaining and Servicing the Allegiant
To remove a PCB:
1.
Disconnect all power to the light bar.
2.
Remove the dome as described previously.
3.
Note and record the connection to the PCB, and then lift the assembly and
disconnect the harnesses.
4.
Remove the assembly from the light bar.
5.
For ROC PCBs, gently release the snap tabs securing the PCB to the reflector.
Reinstalling a PCB
To reinstall a PCB:
For ROC PCBs, gently snap the PCB to the reflector.
1.
ROC boards must be connected as shown in Figure 8 to avoid overloading a
single connector. Install the assembly to the light bar and reconnect the harnesses.
2.
Reinstall the dome. To prevent cross-threading the barrel nuts, back them
counterclockwise until you hear the click of the threads engaging, and then tighten
them to 16-24 in-lb.
3.
Reconnect power to the light bar.
Resetting the Controller
These instructions explain how to reset the Allegiant
®
light bar after you install a
service replacement board or if the light heads operate erratically. For the light bar to
operate correctly, the controller stores information about which LED colors it controls.
To scan the colors that are available at the end of the reset cycle, the controller briefly
flashes all LEDs simultaneously.
Be sure to perform the reset cycle on a vehicle with a well-charged battery. Failure to
do so may cause the light bar to flash or operate incorrectly.
To reset the controller:
1.
Remove the barrel nuts and lens from the light bar. See "Removing and Reinstalling
the Light Bar Dome" on page 21.
NOTE
: If you are replacing the controller, ensure that power to the light bar is off,
and then disconnect all connectors to the controller. Install the new controller and
reconnect all cables to the controller board.
2.
Connect the ROC board connectors to the controller.
3.
Connect the Power and GND cables to the controller.
4.
Connect the STT Cable to the controller if needed.
