Optical Adjustments; Contrast Adjustment - Panasonic PT-VX400U Service Manual

Optical Adjustments

Before taking optical adjustments below, remove the cabinet top following to the "Mechanical Disassembly".
Adjustments require a 2.0mm hex wrench and a slot screwdriver.
Note: Do not disconnect connectors on the main board, because the projector cannot turn on due to operate the
power failure protection.
WARNING : USE UV RADIATION EYE AND SKIN PRO-
TECTION DURING SERVICING
CAUTION: To prevent suffer of UV radiation, those
adjustment must be completed within 25
minutes.

Contrast adjustment

[Before Adjustment]
- Input a 100% of black raster signal.
1
A (Fig.1)
Loosen a screw
base.
2
B
Adjust the slot to obtain the darkest brightness on the screen by
using a slot screwdriver.
3
A
Tighten the screw to fix the G-polarized glass mounting base.
- This adjustment should be performed in the darkest room to improve
the precision of adjustment.
on the G-polarized glass mounting
-30-
A
Slot B
Fig.1