Service manual

Ver. 3/00 1-1 Sharp Electronics Corporation
HOW TO CONVERGE THE LCD PANELS
For the models XG-NV1U, XG-E1200U, PG-D100U, XG-E3000U,
XG-NV2U, XG-NV3XU, XG-NV3XB, and XG-E3500U
Tools and equipment needed:
• Pattern Generator that can produce a crosshatch pattern (grid pattern)
• Eccentric Cam Adjustment Wrench. (Sharp Part # 9DASPN-XGNV1U)
• L-shaped Hex Wrench (Sharp part # 9EQLNC-XGNV1U)
• Philips Screwdriver
NOTE: Confirm focus before performing the 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. 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)
Continued on next page