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3.3.2 Manually Adjusting the Lamp Position
The individual X-Y-Z Lamp Position buttons, each of which moves the lamp in one axis only, are provided as
a reassuring back-up should the Do Auto button fail or if you feel the manual, operator-assisted lamp
optimization results in greater output or improved brightness uniformity. Either measure your results with a
light meter at the lens and screen or simply watch the light output gauge in the Intensity column of the
Advanced Setup: LampLOC Setup window. NOTE: These buttons may attain a slightly higher peak than
the Do Auto button, but the peak may not be centered on the lamp curve and lamp performance may not be
optimized. Also, the Do Auto button utilizes filtering to eliminate the effects of any lamp flicker. In general, use
the individual buttons only when you feel it is unavoidable.
Obtain peak readings on a light meter centered in front of the lens and then at the center of the screen. For each
button, continue in one direction and then back up or reverse when the reading begins to decrease.
NOTES: 1) This is an optional procedure—use the light output gauge in the Advanced Setup: LampLOC
Setup window if preferred. 2) After performing LampLOC™ (Do Auto), brightness uniformity may also be
improved on some lamps by manually adjusting the z-axis motor control. In some instances, this may cause a
reduction in overall brightness.
1. Display a 100% white internal test pattern.
2. Use a tripod to center the light meter with the lens. The distance from the lens does not matter. You may
need an attenuator or wish to construct an internal foil aperture first.
3. Adjust forward/aft (Z) until the brightness reading in front of the lens is maximized.
4. Adjust left/right (X) and up/down (Y) until the brightness reading in front of the lens is maximized.
5. Repeat Steps 3-4 as necessary.
6. Repeat Steps 3-5, but reading at the screen instead of at the lens.
7. Reset Lamp Power or LiteLOC
window.
D4K25 Service Manual
020-100880-01 Rev. 1 (06-2012)
if desired in the Advanced Setup: Lamp Power / LiteLOC Setup
™
Section 3: Service Setups
3-5
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