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(20). Pedestal Level Adjustment
Test Point:
Video Out Y/C Connector
Adjust:
R812 (PED)
8
Select the CH1-Component Input by the Device setting,
and supply the Ramp signal to the Component Input
Connector of CH1.
8
Connect the Terminated Oscilloscope with 75Ω to the
Video Out Y/C Connector.
8
Adjust R812 so that the Pedestal signal level becomes 0
+ 1
IRE as shown in Fig. 3-10.
– 0
NG
+ 7
0
mV
– 0
(21). Component Y Gain Adjustment
Test Point:
Video Out Y/C Connector
Adjust:
R811 (COMP Y GAIN)
8
Select the CH1-Component Input by the Device setting,
and supply the Ramp signal to the Component Input
Connector of CH1.
8
Connect the Waveform Monitor to the Video Out Y/C
Connector.
8
Adjust R811 so that the Y signal level becomes 700 ± 14
mV as shown in Fig. 3-11.
100
700 ± 14
mV
20
–20
–40
8
Confirm that the Pedestal level stays same level,
8
If not, repeat steps 20 and 21 until satisfactory.
Rear Panel
Input Board
700 ± 7 mV
Fig. 3-10
Rear Panel
Input Board
Fig. 3-11
(22). Component C Gain Adjustment
Test Point:
Video Out Y/C Connector
Adjust:
R809 (COMP C GAIN-1)
R810 (COMP C GAIN-2)
Select the β Component Input by the Device setting, and
8
supply the P
= 0.7V Component Colour Bar signal to the
B
Component Input Connector of CH1.
8
Connect the Vectorscope to the Video Out Y/C Connector.
8
Adjust R809 and R810 so that the Chrominance Gain and
Phase are adjusted to proper position (± 3%, 3%) as
shown in Fig. 3-12.
dø
dG
10°
0°
10°
dG
(23). Horizontal Phase Adjustment
Test Point:
Video Out Y/C Connector
Adjust:
R804 (H-PHASE)
8
Select the CH1-Y/C Input by the Device setting, and
supply the Cross-hatch signal to the Y/C Video Input
Connector of CH1.
8
Connect the Oscilloscope to the Video Output terminal of
the Signal Generator, then measure the Horizontal Phase
" t " as shown in the Fig. 3-13.
8
Change the connection of the Oscilloscope to the Y
terminal of the Video Out Y/C Connector.
8
Adjust R804 so that the Horizontal Phase becomes t ± 70
nS.
10
cy
g
R
M
G
V
20%
75%
Y
L
100%
b
U
B
yl
20%
C
G
Y
mg
r
Fig. 3-12
t
Fig. 3-13
Rear Panel
Input Board
Input Board
Rear Panel
Input Board
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