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4. Adjustment Procedure
8
Refer to the Location of the Test Points and
Adjusting Controls on page 14.
Power Board
(1). Power Good Signal Adjustment
Test Point:
Pin 2 of CN3 (5V)
Pin 1 of CN3 (P-GOOD)
Adjust:
VR1 (4.85V)
VR3 (P-GOOD)
8
Connect the Digital Voltmeter to the pin 2 of CN3.
8
Adjust VR1 to obtain 4.85 ± 0.5 V DC.
8
Change the connection of the Digital Voltmeter to the pin 1
of CN3.
8
Adjust VR3 so that the Power Good Signal level just
changes from Low level to High level.
8
Confirm that the changing point should be between 4.8V
DC and 4.9V DC by adjusting of VR1.
(2). 5V Adjustment
Test Point:
L202 (5V)
Adjust:
VR1 (5V)
8
Connect the Digital Voltmeter to L202 on the Mixer Board.
8
Adjust VR1 to obtain 5.05 ± 0.02V DC.
(3). 12V Adjustment
Test Point:
TP3 (12V)
Adjust:
VR2 (12V)
8
Connect the Digital Voltmeter to TP3 on the Mixer Board.
8
Adjust VR2 to obtain 12 ± 0.05V DC.
Mixer Board
(4). Subcarrier Frequency Adjustment
Test Point:
TP6 (FSC)
Adjust:
VR202 (FSC)
8
Connect the Frequency Counter to TP6.
8
Adjust VR202 to obtain 17.734525 MHz ± 5 Hz.
(5). Ach VCO Adjustment
Test Point:
Land between R997 and L742 (Ach VCO)
Adjust:
L742 (Ach VCO)
8
Executes the Manual Digitizer and set the Record mode.
8
Select the CH1-Y/C Input by the Device setting, and
supply the Colour Bar signal to the Y/C Video Input
Connector of CH1.
8
8
(6). Bch VCO Adjustment
Test Point:
Adjust:
Power Board
8
Power Board
Power Board
Power Board
8
8
8
8
Mixer Board
8
Power Board
Mixer Board
Power Board
(7). Output Y Gain Adjustment
Mixer Board
Test Point:
Mixer Board
Adjust:
8
8
Mixer Board
Mixer Board
7
Connect the Digital Voltmeter to the land between R997
and L742.
Adjust L742 to obtain 2.1 ± 0.1V DC.
Land between R98 and L743 (Bch VCO)
L743 (Bch VCO)
Set the SW1 and SW2 on the Pattern Side of the MIxer
Board are as shown in Fig. 3-1.
SW1
8 7 6 5 4 3 2 1
ON
Fig. 3-1
Executes the Manual Digitizer and set the Record mode.
Select the CH1-Y/C Input by the Device setting, and
supply the Colour Bar signal to the Y/C Video Input
Connector of CH1.
Connect the Digital Voltmeter to the land between R98
and L743.
Adjust L743 to obtain 2.1 ± 0.1V DC.
After completion of adjustment, set the SW1 and SW2 as
shown in Fig. 3-2.
SW1
8 7 6 5 4 3 2 1
ON
Fig. 3-2
Before start to next steps, executes the Sequence
Editor, then plays the Still Image of the Colour Bar
(Setup = 0) by drag & drop the Colour Bar Icon to the
Sequence Editor.
Video Out Y Connector
R439 (Y GAIN)
Connect the Waveform Monitor to the Video Out Y
Connector.
Adjust R439 so that the Y Level of the Y Reference signal
becomes 700 ± 7 mV as shown in Fig. 3-3.
Mixer Board
Mixer Board
SW2
8 7 6 5 4 3 2 1
ON
SW2
8 7 6 5 4 3 2 1
ON
Rear Panel
Mixer Board
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