Maintaining and Servicing the Reliant
17
Installation, Maintenance, and Service Manual
Federal Signal www.fedsig.com
4. To remove fine scratches and haze, use a soft cloth and a high-quality automotive
paste cleaner/wax that is non-abrasive.
Replacing a PCB
The Reliant™ light bar has two end and two intermediate ROC (Reliable Onboard
Circuitry™) PCBs. The passenger side intermediate ROC contains the controller circuitry.
See Figure 4.
Figure 4 Ground screw
Ground Screw
Bottom View
DS
PS
STATIC SENSITIVE DEVICE: This light bar circuitry can be damaged by
electrostatic discharge (ESD). Follow anti-static procedures when servicing this
light bar.
To replace a PCB:
1. Disconnect all power to the light bar.
2. Refer to the instructions supplied with the mounting kit to detach the light bar from the
vehicle.
3. Remove the two cable clamps that secure the service loop to free the cable loop. Flip
the bar upside down. To service the bar on a bench, disconnect the cables inside the
vehicle and remove the bar.
4. Mark the position of the mounting feet, and then loosen the 5/16-inch nuts securing
the mounts to the extrusion so the mounts can be moved for screw access.
5. Remove the seventeen six-lobe screws securing the extrusion. Note the ground screw
has a lockwasher. See Figure 4.
6. Remove the extrusion and separate the side assemblies about an inch. See Figure 5.
Figure 5 Separated side assemblies
