Failure of Lamp to ignite
In the event of the lamp failing to light the following steps should be taken:
1)
Check that the supply is connected to the input of the PSU and check all connections as
per the wiring diagram. On operation if the lamp does not light, switch off supply and check
all fuses.
2)
On your command get an operator to switch on the light for approximately 2 seconds.
During this time listen for any noise (cracking or hissing) coming from the igniter housed in
the rear of the searchlight. If this arcing is heard switch off the supply. Remove the front
and rear bezels to expose the two supply leads to the lamp. Using a dry cloth wipe these
leads to remove any dust, moisture or condensation that may have formed around the
inside of the barrel. Replace the front and rear bezels, ensuring the latches are securely
fastened, and perform the check again, listening for the cracking. If the lamp still fails to
ignite, switch off at the supply and replace the lamp in accordance with the safety
procedures within the manual and the
manufacturer’s
information.
Any further tests to be carried out with regards to lamp failure must be conducted by a
competent electrical engineer and should not be carried out in an explosive atmosphere.
3)
Before a xenon lamp will ignite, the electrically insulated gas between the electrodes must
be ionised. This is done by the ignitor which produces a high frequency voltage (up to
14,000 volts or higher). Switching the lamp on activates the ignitor. A cracking or hissing
noise should be heard. The ignitor is housed within the rear of the searchlight. If found to
be faulty return to Francis Searchlights Ltd for evaluation and repair.
Failure of Remote Focus Facility
The remote focus mechanism is controlled by a small electric motor situated on the rear
bulkhead assembly within the searchlight barrel. If the focus of the light fails, the following
procedure should be adopted:
1)
Remove the rear bezel from the searchlight barrel and examine focus mechanism. If parts
have become loose, tighten fasteners. The mechanism operates on a cam action and this
should be checked for correct positioning.
2)
If the mechanism is okay, check the supply to the motor. This can be done by simply
placing a multimeter across the motor terminals.
3)
If supply is present, this indicates that the motor has failed. Replace the focus motor
ensuring that the assembly is correct.
4)
If no supply is present trace all wiring back.
Note: If a fault occurs on the pan and tilt gearbox, the unit should be returned to Francis
Searchlights Limited for fault evaluation and repair.