Back Focus Adjustment - Sanyo PLV-WF20 Service Manual

Optical Adjustment

4. Back focus adjustment

Lcd panel/prism
top view
Before Adjustment :
1
Select the internal test pattern signal "Cross" from the projector's menu "Menu -> Setting -> Test pattern".
2
Adjust the focus by pressing the Focus U V buttons on the projector or remote control unit.
3
Press the Zoom U V buttons on the projector or remote control unit to set the TELE and WIDE. When focus is
changed at TELE and WIDE, following adjustment is necessary.
Adjustment :
1
Loosen 4 screws-A using a hex wrench.
2
Set image size to the minimum, pressing the Zoom V button on the projector or remote control unit.
3
Adjust center part of grid pattern to sharp focus by pressing the Focus U V buttons on the projector or remote
control unit.
4
Set image size to the maximum by pressing the Zoom U button on the projector or remote control unit.
5
Insert a slot screwdriver into slot-B, turn it and adjust center part and four corners on the grid pattern to be sharp-
ened focus.
6
Repeat steps  to 5 until the focus does not shift by the ZOOM position between TELE and WIDE.
7
Tighten 4 screws-A to fix the assembly LCD panel / prism.
2
1
5
3
4
Minimum zoom (TELE)
A
Slot B
A
1
5
3
Maximum zoom (WIDE)
-59-
2
4