17
Installation, Maintenance, and Service Manual
Federal Signal
www.fedsig.com
Maintaining the Message Board
Maintaining the Message Board
Establishing a regular maintenance schedule for the LED Message Board extends its life
and ensures safety. Periodically verify that the Message Board operates properly and
that all mounting hardware is securely fastened to the vehicle. Inspect the reflectors for
cracks, crazing (hairline cracks), discoloration, and other defects.
Replacing the Internal 15 A Fuse
The Message Board is protected with an internal 15 A blade fuse on the upper rear corner
of the driver-side PCBA. See Figure 4. To see if the fuse is bad, inspect the horseshoe-
shaped wire in it to see if it has burned through and broken the circuit.
Figure 4 Fuse location on PCB
DRIVER-SIDE END CAPS
PHILLIPS PLASTITE
SCREW (4)
ALUMINUM CARRIER
15 A BLADE FUSE
ON PCB
290A7196B
STATIC-SENSITIVE DEVICE: The light bar circuitry can be damaged by
electrostatic discharge (ESD). Follow anti-static procedures while installing the
light bar.
To replace the fuse:
1.
Remove the four Phillips PLASTITE® screws from the driver-side end of the Message
Board.
2.
Remove the two end caps.
3.
To access the fuse, slide the aluminum carrier and PCBs out approximately two inches.
4.
Pull the fuse straight out to avoid damaging the connector.
5.
Gently press a new fuse of the same type and amperage into the connector. Ensure
that all pins are properly seated.
6.
Reassemble the Message Board. Use caution to prevent stripping the threads in the
polycarbonate housing.