PREFACE THE STRONG HIGHLIGHT II Xenon ... - Iceco.com

BULB INSTALLATION & OPERATION (continued)A NEW BULB is normally operated at or slightly below the “nominal” current level. As thebulb ages, the quartz envelope will darken and the light output will decrease. To restore the light output, theoperating current can be gradually increased to, but not exceeding, the maximum current. Because of manufacturingtolerances on xenon bulbs, one lamp in a two-machine booth may operate at a slightly higher orlower current setting than the other to balance the light on the screen.ONCE OPERATING at its correct current setting, the xenon bulb must be positioned insidethe reflector to project its optimum light field. The bulb positioning mechanism is mounted to the back of thebulb enclosure inside the lamphouse compartment, and is accessible through the small hinged door in the rearconsole access door.THE CENTER SECTION of the control is a threaded member that focuses the bulb inrelation to the reflector. Turning this adjustment moves the bulb in only one plane, into or away from thereflector. Clockwise rotation moves the bulb away from the reflector. The small knurled screw to the leftof this section can be tightened to lock the focusing mechanism, after the following procedures have beencompleted.THE THUMB SCREWS on either side of the focusing control lock the horizontal andvertical adjustment mechanism in position. The thumb screws are spring-loaded to apply a degree of tensionbetween the mechanism housing and the back of the bulb enclosure.REMOVE THE PROJECTION LENS, start the projector motor and open the lamphousedouser. Since a xenon light source can be focused to a small, intense spot at the projector trap, do notoperate the lamp with the douser open without first starting the projector motor.THE IMAGE projected to the screen, without the projection lens, is that of the center holeof the reflector, and the shadow of the anode (the larger of the two electrodes in the xenon bulb). Theprojection of the anode shadow will appear on the screen as a darker spot surrounded by the grey area of thereflector center hole.HL2/012