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8-7
2-6. VIDEO SYSTEM ADJUSTMENTS
For the video system adjustment, follow the adjustment procedures
given below as a rule. The color bar video signal supplied from the
pattern generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies the
specified value designated in the "Check of input signal (Fig. 8-2-2).
[Adjustment Sequence]
1) X'tal OSC Check
2) SYNC AGC Check
3) White Clip/Dark Clip Check
4) REC Y Level Check
5) REC Chrome Level Check
6) Playback Level Check
given below as a rule. The color bar video signal supplied from the
pattern generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies the
specified value designated in the "Check of input signal (Fig. 8-2-2).
[Adjustment Sequence]
1) X'tal OSC Check
2) SYNC AGC Check
3) White Clip/Dark Clip Check
4) REC Y Level Check
5) REC Chrome Level Check
6) Playback Level Check
2-6-1. X'tal OSC Check (MA-283 Board)
Mode
Playback
Signal
Alignment tape : Color bar portion
Measurement
IC301 pin@£
point
Measuring
Oscilloscope and Frequency counter
instrument
Specified
PAL : 4,433619±96Hz
value
Note :
A frequency counter should be connected through a buffer
ampifier (oscilloscope, etc.) having a high impedance and a
low capacitance.
ampifier (oscilloscope, etc.) having a high impedance and a
low capacitance.
[Check Method]
1) Check that the oscillation frequency satisfies the specified value
1) Check that the oscillation frequency satisfies the specified value
and that the oscillation voltage is 450±200mVp-p.
2-6-2. SYNC AGC Check (MA-283 Board)
Mode
E-E
Signal
Color bar
Measurement
Video monitor video output terminal
point
Measuring
Oscilloscope
instrument
Specified
A=2.02±0.14Vp-p
value
[Check Method]
1) Check that the SYNC AGC level (A) satisfies the specified value.
1) Check that the SYNC AGC level (A) satisfies the specified value.
2-6-3. White Clip/Dark Clip Check (MA-283 Board)
Mode
E-E
Signal
Color bar
Measurement
IC301 pin#™
point
Measuring
Oscilloscope
instrument
Specified
White clip : A=190±15%
value
Dark clip : B=52±10%
[Check Method]
1) Check that the white clip level A is 190±15% to the white (100%)
1) Check that the white clip level A is 190±15% to the white (100%)
level.
2) Check that the dark clip level B is 52±10% to the white (100%)
level.
Fig. 8-2-8.
Fig. 8-2-9.
450±200mV
4,433619±96Hz (PAL)
Fig. 8-2-7.
White (100%)
H
A
White (100%)
100%
B
A
H
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