Sanyo LNS-W50 Use and care manual

Projector Lens Replacement Procedure
Model Number
1AA6P1P5701-- (IFNR)
LNS-W50/LNS-W51/LNS-W52/LNS-S50/LNS-T50/LNS-T51
Lens installation and replacement should be made by the qualified
service personnel.
Do not give a shock or excessive load to the projector or the lens
components as the projector and lens components contain precision
parts.
When transporting the projector with the lens, remove the lens before
transporting the projector. The lens and the lens shift mechanism may
be damaged by improper handling during transportation.
Before removing or installing the lens, be sure to turn off the projector,
wait until the cooling fans stop, and turn off the main power switch.
Do not touch the lens surface when removing or installing the lens.
Keep fingerprints, dust or oil off the lens surface. Do not scratch the
lens surface.
Work on a level surface with a soft cloth under it to avoid scratching.
If you remove and store the lens, attach the lens hole cover to the
projector to keep off dust and dirt.
When using the LNS-W52 lens unit, set the lens shift adjustment to the
center of the screen. Otherwise, the edges of the screen may become
darker or shadows may appear.
Notes on Lens Replacement
Printed in Japan
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-2-
Installing or Removing the Optional Lens
Keep the lens hole cover in safe for later use.
Use the lens hole cover to the projector during
transportation.
Remove the Lens hole cover
1
2
Fig-2
Red mark
Mount the Lens
1. Remove the protective caps (front and back) on
the lens.
2. Insert the lens into the Lens Bracket so that the
red marks on the lens and Lens Bracket can
match.
3. Slowly turn the lens clockwise until it clicks. Make
sure that the lens is fully inserted to the projector.
3Remove the Lens
LENS HOLE COVER
Fig-1
LENS RELEASE BUTTON
Fig-3
1. Press and hold the LENS SHIFT button for more
than 5 seconds to shift the lens to the center
position.
2. Turn off the projector, wait until the cooling fans
stop, and then turn off the Main On/Off switch or
unplug the AC power cord.
3. Push the Lens release button and turn the lens
counter-clockwise and then take it out.
NOTE: Be careful not to drop the lens.
About the lens antitheft screw
To prevent removal of the installed lens, move the lens
to the leftmost position with the Lens Shift function, and
then loosen an antitheft screw on the right side of the
lens until it will no longer be loosened.
Doing so makes the Lens release button unworkable
and the lens will not be removed from the projector.
When you replace the lens, tighten the antitheft screw.
LENS ANTITHEFT SCREW

-3-
Screen surface versus focal point
About the focus balance
Focus Correction
When the lens is attached to the projector and images are being projected onto the screen, the
peripheral focus may be out of focus in some localized areas. If this happens, adjust the three
focus adjustment screws on the lens mount to adjust the focus balance of the screen.
Projection lens
Image formation surface
Relationship between lens orientation and screen focus
Adjustment preparations
Set up the projector and project images on
the screen.
Press and hold the LENS SHIFT button for
more than 5 seconds to shift the lens to the
center position.
Adjust the focus to make the center area
sharpest, by using the focus adjustment of
the projector.
When the peripheral focus is out of focus in
some localized areas, follow the procedure
on the next page and adjust the focus
balance on the screen.
If the projection lens is tilted with respect to the plane of the screen, uneven focus will result. For
example, when the front side of the lens (screen side) is tilted downward as shown in the figure
below (direction of the dotted arrrow), the upper part of the screen will be tilted backward and the
lower part of the screen will be tilted forward.
Three focus adjustment screws on the lens mount may be used to compensate for uneven screen
focus.
Please adjust the focus balance of the screen by turning the focus adjustment screws.
1.
2.
3.
4.

-4-
A
B
C
Adjustment procedure
Locking screw
(Black)
Adjustment screw
(Silver)
Screen
Locking screw
(Black)
Adjustment screw
(Silver)
Screen
Screen
Adjustment screw (Silver)
Locking screw (Black)
T/L
B/R
B/L
T/R
L R
Loosen the focus locking screws (Black) of the adjustment point.
Turn the focus adjustment screws (Silver) to adjust the focus balance.
When adjustment is complete, tighten the locking screws (Black).
Three adjustment screws can work on the following focus balances respectively.
Point A
Adjust the focus balances of left and right side of the screen.
Point B
Adjust the focus balances of top left and bottom right of the screen.
Point C
Adjust the focus balances of top right and bottom left of the screen.
1.
2.
3.
NOTE; Please use either a hexagon screwdriver or hexagon wrench (3 mm) for adjustment
screws and locking screws.
Turning the screw counter-clockwise
●Move the optimal focus of right side of the screen backward.
Turning the screw clockwise
●Move the optimal focus of right side of the screen forward.
Turning the screw counter-clockwise
●Move the optimal focus of bottom right of the screen backward.
Turning the screw clockwise
●Move the optimal focus of bottom right of the screen forward.
Turning the screw counter-clockwise
●Move the optimal focus of top right of the screen backward.
Turning the screw clockwise
●Move the optimal focus of top right of the screen forward.