Servicing The Sifm Ils; Replacing A Pcb - Federal Signal Corporation SIFMH Installation Maintenance And Service Manual

To clean the reflectors:
1. Remove the light bar from the vehicle according to the vehicle-specific installation
instructions included with the SIFM ILS.
2. Use a soft tissue to clean the reflectors. If needed, you can use a solution of mild soap
and water, but take care to avoid getting the PCBs wet. Avoid heavy pressure and the
use of caustic, abrasive, or petroleum-based cleaners, which will scratch or dull the
reflectors.
3. When you are finished, make sure the light bar is completely dry before reinstalling it
according to the vehicle-specific instructions.

Servicing the SIFM ILS

This section has instructions for replacing the light bar PCBs and reflectors. For additional
service and support, call the Federal Signal Service Department at 800-433-9132, 7 a.m.
to 5 p.m., Monday through Friday (Central Time). For lists of common replacement parts,
see "Ordering Replacement Parts" on page 18.

Replacing a PCB

NOTE: After replacing an LED board an LED scan may be necessary. For the serially
controlled model, see Table 1 on page 10 for the DIP switch setting. For the
discrete-wire model, see "Programming the Discrete-Wire SIFM ILS" on page 12 for
information on cycling through the flash patterns using the white programming wire.
To replace a PCB:
1. Remove the light bar from the vehicle according to the vehicle-specific installation
instructions included with the SIFM ILS.
2. See Figure 3 on page 16. Remove the cover on SIFMH models.
3. Disconnect the cables. For the power/ground connector, press the tabs with a pen or
small screwdriver and remove the wires.
4. Remove the #6-32 nuts that hold down the cable clamps, reflectors, and PCB.
Lift off the parts and remove the PCB.
5. Reassemble the light bar. Twist the power and ground cables to ensure there are no
stray wires.
Installation, Maintenance, and Service Manual
Federal Signal www.fedsig.com
Servicing the SIFM ILS
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