Sanyo LNS-W50 Gebrauchs- und Pflegehandbuch

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

●

-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

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.

-4-

Adjustment procedure

Locking screw

(Black)

Adjustment screw

(Silver)

Screen

Locking screw

(Black)

Adjustment screw

(Silver)

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.

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.

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