Federal Signal 224XST Instrucciones De Servicio página 6

A.
Flash Tube Replacement.
As strobe lights are used, the flash tubes begin to darken, causing the light
output to decrease. This darkening is characteristic of flash tubes. The darkening will
begin near the base of the tube and progress upward. In addition, as flash tubes age,
they may have a tendency to misfire (not fire periodically).
After extended operation, occasionally check for flash tube degradation.
Should the flash tube misfire, have a noticeable decrease in light output, glow continu-
ously or darken to a point beyond that shown in Figure 1 it should be replaced.
High voltages are present inside the light assembly. Wait at least 5 minutes
after shutting off the power before servicing this unit.
To change the flash tube, proceed as follows:
1. Disconnect power.
2. Loosen the setscrew, located on the bottom of dome.
3. Grasp the top of the dome and push down while turning the dome coun-
terclockwise approximately 3/4-inch (19 mm).
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. Grasp the flash tube by its base and pull it out of the socket, using a
gentle "rocking" motion. Install new flash tube, ensuring that the flash tube is fully
seated in the socket.
7. Reinstall interior lens.
8. 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.
9. 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)].
10. Replace the screw into the bottom of the dome.
11. Test the light for proper operation.
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