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4-3-2. 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.
HDC-750A
B
10uS
W
L
4-3. VA-158 Board Adjustment
7
6
5
4
3
2
E1
RV300
RV500
RV700
VA-158 BOARD (A SIDE)
1
A
B
C
D
CN1
E
F
G
H
J
K
L
4-5 (E)
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