Airfield Lighting Systems UK Limited
Aviation House, Russell Gardens, Wickford
Essex SS11 8BF Tel +44 1702 547866
www.alsukltd.co.uk
4.2.4 Replace the prism and its sealing gasket
1. Place the light fixture upside down, remove the
six m5 × 16 hexagon screws, and separate the
upper cover from the bottom cover (if the upper
cover and the bottom cover are adhered too
tightly, pry it open with the help of a large slotted
screwdriver).
2. Unplug the connector between the LED module
and the electrical driver and separate the upper
cover and the bottom cover.
3. Remove the six M5 × 16 hexagon screws, and
take out the prism pressing plate and prism
gasket.
4. Attach the prism pressing plate and prism
gasket. (Confirm that the specifications of the
prism and the replaced prism are consistent).
5. Install the prism gasket and prism pressing
plate on the upper cover, and tighten with six m5
× 16 hexagon socket screws.
6. Connect the connector LED module to the
electrical driver in the bottom cover. Align the
bottom cover with the pin hole on the upper cover,
and screw in the six m5 × 16 inner hexagon cap
screw to fasten firmly.
7. Perform water-tightness test. If air leaks out of
the light fixture, locate the leaking point and open
the lamp for repair. After rechecking, assemble
the light fixture and perform the water-tightness test again.
