Canon D78-5311, Руководство по обслуживанию

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Part 3: Adjustment
3-16
3. OPTICAL ADJUSTMENTS
Before taking optical adjustments below, remove the Cabinet Top and Main Board
following to the “Mechanical Disassemblies”
Adjustments require a 2.0mm hex wrench and a slot screwdriver. When you adjust
Condenser lens, Condenser lens-out or Relay lens adjustment, you need to disconnect
some connectors and FPC cables of LCD panels on the main board.
3.1 Contrast Adjustment
[Before adjustment]
• Input a 100% of black raster signal.
[R/G/B-contrast adjustment]
1. Loosen a screw
A
(
Fig. 3-8/3-9
) on the polarized
glass mounting base which you intend to adjust.
2. Turn the polarized glass mounting base as shown in
Fig. 3-8
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.
Fig. 3-8
Fig. 3-9
CAUTION
Do not disconnect connectors K8N, K8P, K8H, K8R and K8S on the
main board, because the projector can not turn on due to operate the
power failure protection.
Slot B
Polarized glass
mounting base
A
B-Polarized Glass
Mounting Base
G-Polarized Glass
Mounting Base
A
A
Main Board
A
R-Polarized Glass
Mounting Base