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4-7. Overall Video Adjustment
4-7. Overall Video Adjustment
4-7-1. VA Gain Adjustment
Equipment: Oscilloscope
Object:
Grayscale chart
Preparations
. Extend the VA-158 board.
. Shoot the grayscale chart which is well-maintained
(reflectance of 89.9%) so that the chart frame is aligned
with the underscanned monitor frame.
(F8, 2000 lx, 3200 K)
. Settings for MSU-700
CLOSE button → OFF (dark)
ECS/SHUTTER ON button → OFF (dark)
Adjustment Procedures
1. VA OUT R level adjustment
Test Point:
TP17/extension board
Adjustment Point: 1RV300/VA-158
A = 400 ± 4 mV
Specification:
2. VA OUT G level adjustment
Test Point:
TP11/extension board
Adjustment Point: 1RV500/VA-158
A = 400 ± 4 mV
Specification:
3. VA OUT B level adjustment
Test Point:
TP5/extension board
Adjustment Point: 1RV700/VA-158
A = 400 ± 4 mV
Specification:
A
50m
Resetting after Adjustment
. Return the switches to their previous positions.
4-14 (E)
B
10uS
W
L
4-7-2. White Shading Adjustment
Equipment: Analog waveform monitor
Test Point: TEST OUT connector
Object:
Full white pattern
Note
When performing the white shading adjustment, make sure
the following conditions are proper. If not, adjustment can
not be complete.
. White pattern is not uneven.
. Luminance is correctly adjusted.
. Iris and zoom control of the lens are correctly adjusted.
Preparations
. Connect the waveform monitor to the TEST OUT
connector of the unit.
. Y/RGB switch (at the top of the side panel) → Y
. Setting for MSU-700
KNEE OFF button
. Shoot the fully occupied white area of the white pattern
on the underscanned monitor frame.
. Iris of the lens: A = 600 ± 20 mV (at F5.6 to F8)
(If a lens aperture is greater than F8, adjust the light
amounts with shutter.)
. Lens Focus: ∞
. Lens Extender/Shrinker: x2, x0.8 → OFF
. Set the setup menu as follows.
MENU: Operation
PAGE: Battery/D56
ITEM: Lens File
(Select the file in accordance with the lens attached. If
there is no appropriate file, select NO OFFSET, then
change the name of lens with MSU.)
A
→ OFF (lit)
HDC-750A
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