Convergence And Focus Adjustment - Sharp XG-NV4SU Service Manual

XG-NV4SU
CONVERGENCE AND FOCUS ADJUSTMENT
.
Start the convergence and focus adjustments with the top panel removed but the power
on. Use the remote control to adjust the image.
Take the following procedures.
Focusing the projection lens
(A) Replacing all the 3 LCD panels
1. Before replacing all the 3 LCD panels, project an image on the screen and bring it into focus.
2. Replace the LCD panels with new ones. But until the focus has been completely readjusted, be careful not
to change the projection distance between the set and the screen, nor to move the projection lens focus
and zoom rings.
Note:
If the focus is readjusted with a different positional relation, the relation between the projection distance
and the screen size is affected. In other words, a short-distance image (40 WIDE for example) may get out
of the focus range, or a long-distance image (300 WIDE for example) may come out of the focus.
(B) Replacing 1 or 2 of the 3 LCD panels
1. In adjusting the focus after replacement of one or two LCD panels' project an image on the screen and turn
the projection lens focus ring to get the non-replaced LCD panel into focus.
2. But until the focus has been completely adjusted for the new LCD panels, be careful not to change the
projection distance between the set and the screen, nor to move the projection lens focus and zoom rings.
3. If the projection distance has been changed or the projection lens readjusted, repeat the above steps 1 and
2 .
r. Focus adjustment
(A) Adjusting the G-LCD panel(Make this adjustment on the white-only screen.)
1 .
2 .
3 .
Adjustment in 8X and Z directions .
Loosen the lock screw "a" and insert an eccentric screwdriver into the notch and hole "a". Turn the screwdriver
until the top, center and bottom on the screen get into focus. In adjusting this top-to-bottom focus, tighten
the lock screws "b" and "c" to fix the 0Y direction adjustment.
First get the right and left halves in balance. Then improve the accuracy while making the adjustment 2
below.
Adjustment in 8Y direction
Temporarily tighten the lock screw "a" and loosen the lock screws "b" and "c". Insert the eccentric screwdriver
into the notch and hole "c" for adjusting in the 8Y direction on the top of the screen. Insert the eccentric
screwdriver into the notch and hole "b" for adjusting in the 8Y direction on the bottom of the screen.
Repeat the above steps 1 and 2 to finely adjust the focus.
Finally tighten up all the lock screws.
Notes :
@ Carefully proceed with the focus adjustment because the adjusting directions are correlated.
@ In adjusting the convergence and focus, do not move the projection lens zoom and focus rings until the end
of all the adjustments.
(B) Adjusting the B-LCD panel (Do the same for the R-LCD panel.)
1. Take the same procedure as for the G-LCD panel focus adjustment. Note that the adjustment range is
wider in the Z direction. If the convergence is quite different between the B-LCD and G-LCD panels,
roughly adjust the convergence first and then the focus.
3. Convergence adjustment
l
Use a crosshatch pattern signal for this adjustment.
Make the adjustment just for the G-LCD and the relevant color.
1. Loosen the convergence lock screw I'd".
2. Adjustment in Y and 8Z directions
Put a hex wrench in the Y and 8Z direction adjustment zone.
3. Adjustment in X direction
Put an eccentric cam adjusting wrench in the X direction adjustment zone.