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1. Subcarrier Frequency Adjustment
Test Point:
Pin 119 or Pin 120 of IC302 (SC VCXO)
Main Board
8
Select the item "1. SC Frequency" with the ARROW Key
and press the ENTER key.
8
Connect the Frequency Counter to Pin 119 or Pin 120 of
IC302 as shown in Fig. 5-2.
Fig. 5-2
8
Adjust data with the ARROW keys so that the Subcarrier
Frequency becomes 17.734 47 MHz ± 40 Hz.
8
Press the ENTER key for the next adjustment.
2. Line Lock Phase Adjustment
Test Point:
Video Output Connector
AC Live Waveform
8
Connect the CH1 of the Oscilloscope to Video Output
Connector.
8
Connect the CH2 of the Oscilloscope to the AC Power
Line.
8
Trigger the Oscilloscope at the V-rate.
8
Adjust data with the ARROW keys so that the Line Lock
Phase becomes 2 H ± 4 H as shown in Fig. 5-3.
Fig. 5-3
8
Press the ENTER key for the next adjustment.
Zero-Cross Point
AC Line Input
Waveform
Waveform
Video Output
Signal Waveform
Signal Waveform
2H
±
4H
–
+
V SYNC
PATTERN SIDE
IC302
Pin 119 or Pin 120
(SC VCXO)
3. High Clip Level Adjustment
Test Point:
Video Output Connector
8
Aim the Camera at the Logarithmic Gray Scale Chart.
8
Connect the terminated Oscilloscope with 75
Ω
to the
Video Output Connector.
8
Adjust data with the ARROW keys so that the High Clip
Level becomes 805 mV mV as shown in Fig. 5-4.
Fig. 5-4
8
Press the ENTER key for the next adjustment.
4. Pedestal Adjustment
Test Point:
Video Output Connector
8
Connect the terminated Oscilloscope with 75
Ω
to the
Video Output Connector.
8
Adjust data with the ARROW keys so that the Pedestal
level becomes 50 mV ± 10 mV as shown in Fig. 5-5.
Fig. 5-5
8
Press the ENTER key for the next adjustment.
5. ALC Level Adjustment
Test Point:
RAM (808F)
8
Aim the Camera at the Logarithmic Gray Scale Chart.
8
Adjust Data with the ARROW keys so that the measured
Data becomes between 00 and 05 on the Computer.
8
Press the ENTER key for the next adjustment.
50 mV
±
10 mV
805 mV mV
+ 30
– 0
– 0
+ 30
– 0
– 0
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