Read Sharp XG-NV21SE (serv.man4) Service Manual online
15
XG-NV21SE
XG-NV21SM
XG-NV21SA
RESETTING THE TOTAL LAMP TIMER
When the lamp has been replaced, reset the total lamp timer in the following steps.
Resetting procedure
1. While holding down the “ENTER”, “ADJ.
"
” and “ADJ.
|
” keys on the set at the same time, turn on the main
power switch (located above the AC inlet).
2. Now the total lamp timer is reset to zero. “000H” appears on the screen.
IN
MN
B
BLACK
SCREEN
MENU
ON/OFF
POWER
INPUT SELECT
MUTE
VOL
EN
ENTER
LAMP
TEMP
ADJ.
|
ADJ.
"
ENTER
16
XG-NV21SE
XG-NV21SM
XG-NV21SA
THE OPTICAL UNIT OUTLINE
Layout of the optical system
Note: Layout for positioning the optical system.
* The M3 mirrors have a coating
wedge (for different film thick-
ness). Set up these mirrors, with
their markings positioned as
shown above, so that their
coated faces and both sides be
in the correct directions.
ness). Set up these mirrors, with
their markings positioned as
shown above, so that their
coated faces and both sides be
in the correct directions.
B-LCD
G-LCD
GREEN
BLUE
BLUE
RED
R-LCD
Dichroic coating
(B transmission)
(B transmission)
Dichroic coating
(B reflection)
(B reflection)
Incident polarizing plate R
Dichroic coating
(R transmission)
(R transmission)
AL-coated mirror R
AL-deposited face
(R reflection)
Marking
Dichroic coating
(G reflection)
Marking
G reflector
Dichroic coating
B/G reflector
AL-coated mirror W
AL-deposited
face
face
Fly-eye lens (outgoing light)
Fly-eye lens (incoming light)
UV-IR coating
PBS aperture
UHP lamp
(Light source)
Relay lens 1
AL-deposited face
AL-coated mirror B
Projection Lens
B reflector
Cross dichroic prism
Incident polarizing plate B
Relay lens 3
Relay lens 2
Incident polarizing plate G
Condenser lens G
Marking
Condenser lens R
* M3
M6
G03
L2
G02
L2
G01
M4
M2
M5
M1
PBS(polarization
beam splitter)
beam splitter)
L1
17
XG-NV21SE
XG-NV21SM
XG-NV21SA
CONVERGENCE AND FOCUS ADJUSTMENT
»
Start the convergence and focus adjustments with the top cabinet and the LCD covers
(Top/Bottom) removed but the power on. Use the remote control to adjust the image.
Take the following procedures.
(Top/Bottom) removed but the power on. Use the remote control to adjust the image.
Take the following procedures.
1. 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 panels with new ones. But until the focus has been completely readjusted, be careful not to
2. Replace the panels with new ones. But until the focus has been completely readjusted, be careful not to
change the distance between the set and the screen, nor to move the projection lens focus and zoom
rings.
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 focus.
rings.
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 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
distance between the set and the screen, nor to move the projection lens focus and zoom rings.
(If the distance has been changed or the projection lens readjusted, repeat the above steps 1 and 2.)
(If the distance has been changed or the projection lens readjusted, repeat the above steps 1 and 2.)
2. Adjusting the G-LCD panel
(A) Focus adjustment. (Make this adjustment on the white-only screen.)
1. Right-and-left focus adjustment (
θ
Y direction) .
Loosen the lock screws "b" and "c" and insert the eccentric screwdriver into the notch and hole "b". Turn
the screwdriver until the right and left halves on the screen get into focus.
First get the right and left halves in balance. Then improve the accuracy while making the adjustment 2
below.
the screwdriver until the right and left halves on the screen get into focus.
First get the right and left halves in balance. Then improve the accuracy while making the adjustment 2
below.
2. Top-center-bottom focus adjustment (
θ
X and Z directions).
Loosen the lock screws "a" and "c" and insert the eccentric screwdriver into the notch and hole "a" or "c".
Turn the screwdriver until the top, center and bottom on the screen get into focus. In adjusting this top-to-
bottom focus, temporarily tighten the lock screw "b" to fix the
Turn the screwdriver until the top, center and bottom on the screen get into focus. In adjusting this top-to-
bottom focus, temporarily tighten the lock screw "b" to fix the
θ
Y direction adjustment.
3. Repeat the above steps 1 and 2 to finely adjust the focus. Finally tighten up all the lock screws.
Notes :
1
Carefully proceed with the focus adjustment because the adjusting directions are correlated.
2
In adjusting the convergence and focus, do not move the projection lens zoom and focus rings until the end
of all the adjustments.
of all the adjustments.
(B) Convergence adjustment
»
The G-LCD panel has no convergence adjustment mechanism. Use this panel as convergence adjustment
reference.
reference.
3. B-LCD panel adjustment (the same for the R-LCD panel)
(A) Focus adjustment
»
Take the same procedure as for the G-LCD panel focus adjustment. Note that the adjustment range is small
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.
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.
(B) Convergence adjustment
»
Use a crosshatch pattern signal for this adjustment.
Make the adjustment just for the G-colour and the relevant colour.
(1) Loosen the convergence lock screw "d".
(2) With the G-LCD panel’s screen center as reference, adjust the B-LCD panel in the X, Y and
Make the adjustment just for the G-colour and the relevant colour.
(1) Loosen the convergence lock screw "d".
(2) With the G-LCD panel’s screen center as reference, adjust the B-LCD panel in the X, Y and
θ
Z directions.
(3) Finally tighten up the convergence lock screw "d".
(
)
)
(
18
XG-NV21SE
XG-NV21SM
XG-NV21SA
Convergence and Focus Adjustments Mechanism
X
Y
θ
Z
G-LCD panel
mounting screws
mounting screws
G adjusting plate
Eccentric cam
(Y direction adjustment)
(Y direction adjustment)
Eccentric cam
(X direction adjustment)
(X direction adjustment)
Eccentric cam
(
(
θ
Z direction adjustment)
Lock screw "d"
(convergence
adjustment)
(convergence
adjustment)
R•B adjusting plate
R•B adjusting plate
R•B-LCD
R•B-LCD
R•B-LCD panel
mounting screws
mounting screws
SIDE VIEW (from inside)
SIDE VIEW
G-LCD
TOP VIEW
SIDE VIEW (from outside)
X
Z
θ
Y
X
Z
θ
Y
Notch and hole "a"
(Use an eccentric
screwdriver.)
(Use an eccentric
screwdriver.)
Notch and hole "b"
(Use an eccentric
screwdriver.)
(Use an eccentric
screwdriver.)
Lock screw "b"
(
(
θ
Y direction)
Notch and
hole "c"
(Use on eccentric
screwdriver.)
hole "c"
(Use on eccentric
screwdriver.)
Notch and hole "c"
(Use an bladed screwdriver.)
(Use an bladed screwdriver.)
Lock screws "c"
Lock screw "a"
FRONT
R-LCD
G-LCD
B-LCD
Notes :
1
The eccentric cam is used for convergence adjustment. This means that the cam’s turning and the linear
movement are not always uniform.
movement are not always uniform.
2
This model is not equipped with the LCD image adjustment mechanism. This is because the dichroic prism
is used for image formation. When the LCD panels all get into the best focus, the images are almost
completely converged.
is used for image formation. When the LCD panels all get into the best focus, the images are almost
completely converged.
