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4. Adjustment Procedure
Refer to the Location of the Test Points and
Adjusting Controls on the page 41.
(1). SC Frequency Adjustment
Test Point:
TP101 (RA SC)
TP201 (RB SC)
TP301 (RC SC)
Adjust:
CT101 (RA SC)
CT201 (RB SC)
CT301 (RC SC)
Disconnect all input signals from the WJ-FS28.
Connect the Frequency Counter to TP101 and TP1
(GND).
Adjust CT101 to obtain 4.433618 MHz ± 5 Hz.
Change the connection of the Frequency Counter to
TP201 and TP1.
Adjust CT201 to obtain 4.433618 MHz ± 5 Hz.
Change the connection of the Frequency Counter to
TP301 and TP1.
Adjust CT301 to obtain 4.433618 MHz ± 5 Hz.
(2). 4fsc Frequency Adjustment
Test Point:
TP901 (4fsc)
Adjust:
CT903 (4fsc)
Connect the Frequency Counter to TP901 and TP3
(GND).
Adjust CT901 to obtain 17.734475 MHz ± 20 Hz.
(3). Encoder Section Adjustment
Test Point:
Recording Output Jack
Adjust:
VR803 (BURST GAIN)
VR804 (Y DIVIDER)
Supply the Composite Sync signal to the Playback Input
Jack on the Rear Panel of the WJ-FS28.
Connect the terminated Oscilloscope with 75Ω to the
Recording Output Jack on the Rear Panel of the WJ-
FS28.
Press the QUAD button on the Front Panel of the WJ-
FS28.
Adjust VR803 so that the Burst signal level becomes 300
± 14 mV as shown in Fig. 4-1.
Adjust VR804 so that the Y Divider signal level becomes
700 ± 14 mV as shown in Fig. 4-1.
Confirm that the Sync signal level becomes 300 ± 30 mV
as shown in Fig. 4-1.
300 ± 14 mV
Main Board
Main Board
Main Board
Main Board
Main Board
(4). PLL HD Phase Adjustment
Main Board
Test Point:
Adjust:
Supply the Ramp signal to the Camera Input Connectors
1, 2 and 3 on the Rear Panel of the WJ-FS28.
Press the CH1 button on the Front Panel.
Connect the CH1 of the Oscilloscope to TP801 and CH2
of the Oscilloscope to TP802.
Trigger the Oscilloscope at TP801.
Adjust VR801 so that the rising edge of the RB HD Pulse
Main Board
becomes within 0 ± 30 ns from the rising edge of the RA
Main Board
HD Pulse as shown in Fig. 4-2.
Change the CH2 of the Oscilloscope to TP803.
Adjust VR802 so that the rising edge of the RC HD Pulse
becomes 0 ± 30 ns from the rising edge of the RA HD
Pulse as shown in Fig. 4-2.
Note: If the waveform distortions are not same, adjust
Rear Panel
Main Board
Main Board
Press the CH4 button on the Front Panel.
Supply the Crosshatch signal to the Camera Input
Connectors 1, 2 and 3.
34
Fig. 4-1
TP801 (RA HD)
TP802 (RB HD)
TP803 (RC HD)
Recording Output Jack
VR801 (RB HD)
VR802 (RC HD)
around 2.5 V DC.
Reference
TP801
TP802
TP803
t
= within ± 30 ns.
p
Note : If the waveform distortions are not same,
adjust around 2.5 V DC.
Fig. 4-2
700 ± 14 mV
300 ± 30 mV
Main Board
Main Board
Main Board
Rear Panel
Main Board
Main Board
2.5 V DC
t
p
2.5 V DC
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