Canon LV-7105 Service Manual - Page 72

OPTICAL ADJUSTMENTS, 1 Contrast Adujstment

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Part 3: Adjustment 3. OPTICAL ADJUSTMENTS 3.1 Contrast Adujstment [Before adjustment] • Adjustment requires a 2.0mm hex wrench and a slot screwdriver. A • Remove cabinet top following to "Mechanical Disassemblies". • Input a 100% of black raster signal. CAUTION Do not disconnect the connectors on main and component boards otherwise the projector can not be turned on. Slot B Polarized glass mounting base Fig. 3-11 [R/G/B-contrast adujstment] 1. Project desired light component on the screen as follows. When adjusting the R-Contrast, project red light only. When adjusting the G-Contrast, project green light only. When adjusting the B-Contrast, project blue light only. 2. Loosen a screw A (Fig.3-11/3-12) on the polarized glass mounting base which you intend to adjust. 3. Adjust a slots B as shown in Fig.3-11 to obtain the darkest brightness on the screen by turning a slot screwdriver. 4. Tighten the screw A to fix the polarized glass mounting base. Repeat steps 1 to 4 for remaining polarized glasses. A B-Polarized Glass Mounting Base R-Polarized Glass Mounting Base A Main Board G-Polarized Glass A Mounting Base Fig. 3-12 3-16

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Part 3: Adjustment
3-16
3. OPTICAL ADJUSTMENTS
3.1 Contrast Adujstment
[Before adjustment]
•
Adjustment requires a 2.0mm hex wrench and a
slot screwdriver.
•
Remove cabinet top following to “Mechanical
Disassemblies”.
•
Input a 100% of black raster signal.
[R/G/B-contrast adujstment]
1.
Project desired light component on the screen as follows.
When adjusting the R-Contrast, project red light only.
When adjusting the G-Contrast, project green light only.
When adjusting the B-Contrast, project blue light only.
2.
Loosen a screw
A
(Fig.3-11/3-12) on the polarized glass mounting base which you
intend to adjust.
3.
Adjust a slots
B
as shown in Fig.3-11 to obtain the darkest brightness on the screen
by turning a slot screwdriver.
4.
Tighten the screw
A
to fix the polarized glass mounting base.
Repeat steps 1 to 4 for remaining polarized glasses.
Do not disconnect the
connectors on main and
component boards
otherwise the projector can
not be turned on.
Slot B
Polarized glass
mounting base
A
Fig. 3-11
CAUTION
Fig. 3-12
B-Polarized Glass
Mounting Base
R-Polarized Glass
Mounting Base
G-Polarized Glass
Mounting Base
A
A
A
Main Board