Canon LV-S3E/D78-5423, Service Manual

Page: 55 / 106

Part 3: Adjustment
3-13
3. OPTICAL ADJUSTMENTS
Before taking optical adjustments below, remove the Cabinet Top and Main Board
following to the “Mechanical Disassemblies”
Adjustments require a plus screwdriver, 2.0mm hex wrench and a slot screwdriver.
3.1 Contrast Adjustment
[Before adjustment]
Input a 100% of black raster signal.
[R/G/B-contrast adjustment]
1. Loosen a screw A (Fig.3-9/3-10) on the polarized
glass mounting base which you intend to adjust.
2. Turn the polarized glass mounting base as shown
in Fig.3-9 to obtain the darkest brightness on the
screen.
3. Tighten the screw
A
to fix the polarized glass
mounting base.
Repeat steps 1 to 3 for remaining polarized glasses.
Do not disconnect connectors K8A, K8B, K8H, K48K, K48L, K66A, K66B,
K66C, K66D, K66E and K66F on the main board, because the projector
can not turn on due to operate the power failure protection.
CAUTION
Fig. 3-10
Fig. 3-9
Polarized glass
mounting base
A
A
A
A
Main Board
G-Polarized Glass
Mounting Base
R-Polarized Glass
Mounting Base
B-Polarized Glass
Mounting Base