Back Focus Adjustment - Christie LX1750C Service Manual

Optical Adjustment

4. Back focus adjustment

LCD panel/prism
top view
Before adjustment :
1
Remove the shutter assy on the prism/LCD panel assy.
2
Select the internal test pattern signal "Cross" from the projector's menu "Menu -> Setting -> Test pattern".
3
Adjust the focus by pressing the Focus
4
Press the Zoom
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
3
Adjust center part of grid pattern to sharp focus by pressing the Focus
control unit.
4
Set image size to the maximum by pressing the Zoom
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 2 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.
buttons on the projector or remote control unit.
buttons on the projector or remote control unit to set the TELE and WIDE. When focus is
2
1
5
3
4
Minimum zoom (TELE)
A
Slot B
A
button on the projector or remote control unit.
button on the projector or remote control unit.
1
5
3
Maximum zoom (WIDE)
-68-
buttons on the projector or remote
2
4
LX1750 Service Manual
020-000643-01 Rev.1 (01-2014)