Service manual

Ver. 3/00 1-7 Sharp Electronics Corporation
HOW TO CONVERGE THE LCD PANELS
For the model XG-NV6XU
Tools and equipment needed:
• Pattern Generator that can produce a crosshatch pattern (grid pattern)
• Eccentric Cam Adjustment Wrench. (Sharp Part # 9DASPN-XGNV1U)
• 2mm Hex Wrench (Sharp part # 9EQLNC-XGNV1U)
• 1.27mm Hex Wrench (available at most hardware stores)
• Philips Screwdriver
NOTE: Confirm focus before convergence procedure. If pixels are in focus in one
area of the screen and indistinguishable in another area, the projector is out of
focus. The focus alignment procedure is beyond the scope of the limited
maintenance program.
Step Procedure Ref. #
1. Checking
convergence.
Refer to the safety notes on page S-1 of the Main Limited
Servicer Maintenance Manual before attempting to converge
the panels.
1. Connect a pattern generator to the video or RGB (when
applicable ) input terminals.
2. Output a crosshatch signal from the pattern generator.
3. Turn on the projector.
4. Mentally divide the screen into fourths both horizontally
and vertically. Imagine the center four squares as the A zone
and the outer one fourth (all around the outside edge) as the B
zone. Look at the grids to determine if the convergence is off.
You should see only white grid lines on the screen ( a white
line is the product of separate red, green, and blue lines
“added together”, or converged over the same area ). If the
red or blue lines are offset from the green lines ( either
up/down or left/right ), the convergence is off. Do not adjust
the green panel. The green panel is fixed, so mechanical
adjustment isn’t possible. If any adjustments to the red or
blue panels are necessary, use green as the reference. If the
unit is converged to within one pixel in the A zone and one
and a half pixels in the B zone the unit is converged within
specification and adjustment is not required.
fig. 3-4
(Main
Manual)