Pa Gain Adjustment - Sony HDC-900 Maintenance Manual

6-3-2. PA Gain Adjustment

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For the PA gain adjustment, using an 89.9%-reflective
grayscale chart is preferable.
Before beginning adjustment, be sure to set the illumina-
tion of the light source (or the lumirous intensity on the
chart surface) and to set the color temperature exactly.
For details, refer to Section 6-1-4 "Maintaining the Gray-
scale Chart"
Eauipment : Oscilloscope
Object : Grayscale chart
Preparations
. Extend the VA-196 board with the extension board
(EX-738).
. Shoot the grayscale chart as shown below.
(Lens: Canon HJ18, F10, 2000 lx, 3200 K).
(When using the 4:3 type)
(When using the 16:9 type)
Chart frame
Underscanned monitor frame
. Setting for MSU-700A
CLOSE button → OFF (dark)
ECS/SHUTTER ON button → OFF (dark)
HDC-900/950 MM
Adjustment Procedures
1. PA OUT R level adjustment
Measuring point : TP22/EX-738 board
Adjusting point : 1RV103/PA-239 board
A = 400 ± 10 mV
Specification :
2. PA OUT G level adjustment
Measuring point : TP14/EX-738 board
Adjusting point : 1RV203/PA-239 board
A = 400 ± 10 mV
Specification :
3. PA OUT B level adjustment
Measuring point : TP6/EX-738 board
Adjusting point : 1RV303/PA-239 board
A = 130 ± 5 mV
Specification :
A
100mV
Setting After Adjustment
. After the adjustment, return the switches to their original
settings.
RV303
RV203
PA-239 Board
6-3. PA-239 Board Adjustment
B 10us
W
L
RV103
6-9 (E)