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7- Fault Finding
All fault finding must be conducted by a competent person or qualified Electrical Engineer.
Failure of Lamp to light
Causes:
1) Power not supplied;
2) Fuse blown;
3) Failed lamp
Remedy:
1) Check voltage at supply. If supply is not present the fault is at the customer supply. If power is
present, see remedy 2;
2) Check fuse for visual failure. If none noticeable check fuse for continuity using a multi-meter. If
fuse found to be faulty, replace with new part and test equipment again for correct working
order. If found to be working correctly see remedy 3;
3) Firstly, check supply at lampholder connecting block (within searchlight barrel). If supply is
present, disconnect unit from power supply before removing the lamp. If noticeable damage to
filament is present, the lamp will have failed. The lamp can also be checked for continuity using
a multi-meter. Replace lamp ensuring all precautions and instructions previously outlined in
this manual are adhered to.
Failure of Remote Focus
Causes:
1) Power not supplied;
2) Faulty connections;
3) Failed motor/transformer
Remedy:
1) Check voltage at supply. If no supply present fault is at customer supply. If power is present
see remedy 2;
2) Check all wiring connections on motor, transformer and terminal rail, in accordance with the
wiring diagram. If found to be correct, see remedy 3;
3) Remove focus motor and apply 24v DC directly across terminals. If motor does not rotate the
unit has failed. A new focus motor should be fitted to the lampholder assembly. If the motor is
working correctly, check output of transformer (mounted in the Motor Gearbox).
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.
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