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8-3-3,
Title A/D Threashold Level Adjustment
(CT-39 Board)
[Mode
EE
|
CHI: Pin @ of C703
Measurement point | Cr: Pin ® of IC703
Measuring instrument | Oscilloscope (DC range, 0.2V/DIV)
'Adjustment element _| RV703
Specified value
0.225 + 0.03V
Adjusting method:
1) Set POWER switch to VTR position.
2) Set IN/OUT select switch to IN position.
3)
Input the staircase signal to VIDEO IN/OUT terminal.
4)
Adjust the threashold level to 0.255V with RV703.
5)
Disconnect the staircase signal.
6) Set IN/OUT select switch to OUT position.
7)
Set POWER switch to CAMERA position.
'When using 8 stair case
signal, set the falliug edge of
CH2 waveform to this point.
1 Vp-p
Threashold
"\~Ievel
|_ Pedestal
H
H level
:
0.284. V
i
Set
a
Fig. 8-39,
8-3-4.
Title Chroma Phase Adjustment (CT-39 board)
Subject
'All white pattem
Measurement point | VIDEO IN/OUT terminal
Measuring instrument | Vectorscope
'Adjustment element | RV702
Specified value
285° + 4°
Adjusting Method:
1)
Press DATA SCREEN button:
2)
Press COLOR/MODE button untill nak is displayed on
the monitor TV screen.
3)
Press TITLE 1 button.
4)
Press MEMORY button.
5)
Press COLOR/MODE button untill a cyan title displayed on
the monitor TV screen.
6) Adjust the cyan luminance point to 285° + 4° with RV702.
R-Y
BURST
285°+ 4°
CYAN LUMINANCE POINT
Fig. 8-40.
=2=
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