Federal Signal 224XST Instrucciones De Servicio página 7

B.
Circuit Board Replacement.
High voltages are present inside the light assembly. Wait at least 5 minutes
after shutting off the power before servicing unit.
1. Disconnect power.
2. Remove the setscrew located at the bottom of the dome.
3. Grasp the top of the dome and push down while turning the dome coun-
terclockwise approximately 3/4-inch (19mm).
4. Gently lift dome away. Ensure that the gasket between the dome and
base is not lost.
5. Loosen the retaining ring fastening screws approximately 1/2 turn. The
retaining ring can then be turned counterclockwise approximately 1/2-inch (13mm),
allowing the retaining ring to be lifted free of the unit. The interior lens can now be
removed from the unit.
6. Remove and retain the screws and heat sink clip (DC model only)
which secure the power supply circuit board to its mounting plate. Remove the power
connector(s) from the P.C. board. Since some strobes are polarity sensitive, connect
matching colored wires together.
7. Secure the new circuit board to the mounting plate with the previously
removed screws. For DC circuit board, reattach heat sink clip.
8. Install flash tube as described in Section III. A (Flash Tube Replace-
ment). Ensure that the flash tube is fully seated in the socket.
9. Reinstall interior lens.
10. Before replacing the dome, ensure that the gasket is properly seated and
shows no signs of cracking or other deterioration. Replace the gasket if it is damaged
or shows signs of deterioration.
11. Place the dome over the base, aligning the recesses inside the dome lip
with the four pins on the base. Push down on the dome and turn clockwise until it
locks in place [approximately 3/4-inch (19mm)].
12. Replace the screw into the bottom of the dome.
13. Test the light for proper operation.
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