Arc Lamp Alignment - Hughes JVC 100 Service Manual

Arc Lamp Alignment

Arc Lamp Alignment insures the brightest area of the Arc Lamp is in the center of
the screen.
For best results, perform ILA
watch the screen close-up and the other to move the CRT/ ILA
and forth. The adjustment is factory-set but may need some touch-up in the field.
1. Remove the front cover.
2. Apply power to the projector and allow it to operate for a minimum of 15
minutes.
3. Verify that the "Shutters on Hide" box is checked in the System-
Preferences menu, then use the RGB key and the HIDE key to hide Red and
Blue. This blocks the light coming from the Red and Blue ILA®s.
4. Access the "Shutters on Hide" box again from the System-Preferences
menu and uncheck the box, then use the RGB and HIDE keys to hide
Green. This mutes the image from the Green ILA® but leaves the Green
shutter open to allow Arc Lamp light from the Green ILA
5. Select ILA
current ILA
adjustment is complete. The Green value only need be recorded because
Red and Blue will return to their original levels when Green is reset.
6. Use the up arrow key and adjust the ILA
light output.
7. Measure the light output in the center of the screen using a calibrated light
meter (Minolta Illuminance Meter T-1 or equivalent).
8. Loosen the 4 Phillips-head retaining screws on the top of the Arc Lamp
Module (see Figure 3-5) to allow the Arc Lamp to move.
9. Turn the 5mm Hex nut on the side of the Arc Lamp Module. Maximize
the center screen brightness in the X-axis on the screen.
10. When the center-screen brightness is maximized in the X-Axis, tighten the
4 Phillips-head retaining retaining screws (see Figure 3-5).
11. Loosen the 4 Phillips-head retaining screws on the side of the Arc Lamp
Module (see Figure 3-5) to allow the Arc Lamp to move.
12. Turn the 5mm Hex nut on the top of the Arc Lamp Module back and
forth(see Figure 3-5) while another person continues to monitor the center
screen brightness with the light meter. Maximize the center screen
brightness in the Y-axis on the screen.
13. When the center screen brightness is maximized in the Y-Axis, tighten the
4 Phillips-head retaining screws (see Figure 3-5).
Model 100 Service Manual
®
Back Focus procedure with 2 people. One person to
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Bias from the System-Factory Adjustments menu. Record this
®
bias level. This bias level will be returned to when this
Chapter 3---Service Adjustments
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assemblies back
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on the screen.
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bias for Green for maximum
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