– 7 –
8
The magnets holding screw will be fastened after
completing next step.
(4). Convergence Adjustment
Adjusts :
Convergence Magnet-1
Convergence Magnet-2
Observe :
Colour Monitor
8
Supply the Dot signal to the Video Input Connector.
8
Adjust the PICTURE and BRIGHT so that much easy to
see the picture on the Screen.
8
Adjust the Convergence Magnet-1 as shown in Fig. 5-3 so
that red and blue dots on the center area of the CRT
Screen is overlapped.
8
Adjust the Convergence Magnet-2 as shown in Fig. 5-3 so
that the green and magenta (Red + Blue) dots on the
center area of the CRT Screen is overlapped (dots
becomes White).
Fig. 5-3
8
Change the signal from Dot signal to Cross-Hatch signal.
8
If a discrepancy appears at the corner area, slightly adjust
the Convergence Magnets 1 and 2.
8
Repeat above adjustment (Convergence Magnets 1 and
2) until no discrepancy appears on the entire screen.
8
Tighten the Magnets Holding Screw.
(5). White Balance Adjustment
Test Point :
Pin 3 of A11 (G)
Main Board
KG (Cathode of Green) CRT Socket Board
Adjust :
SCREEN Control
Flyback Transformer on the Main Board
LEVEL CONTROL (+)
Main Board
LEVEL CONTROL (–)
Main Board
Observe :
Colour Monitor
8
Supply the Monoscope signal to the Video Input
Connector.
8
Set the Service Mode and select the "CHK 1" mode.
8
Select the BRIGHT Item.
8
Set the BRIGHT Item to the center position (32).
8
Select the CONTRAST Item.
8
Set the CONTRAST Item to the maximum position (63).
8
Select the PICTURE Item.
8
Set the PICTURE Item to the center position (32).
8
Select the COLOUR Item.
8
Set the COLOUR Item to the center position (32).
8
Select the "CHK 2" Mode.
8
Select SUB BRIGHT Item.
8
Set the R-CUTOFF to (0), G-CUTOFF to (125) and B-
CUTOFF to (0).
8
Set the R-DRIVE to (40) and B-DRIVE to (40).
8
Short between FA3 and ground by jumper wire.
8
Set the SCREEN Control of the Flyback Transformer to
fully counterclockwise direction.
8
Connect the Oscilloscope to the pin 3 of Connector A11
on the Main Board.
8
Adjust the SUB BRIGHT so that the voltage at the pin 3 of
A11 becomes 2.2 ± 0.05 V DC as shown in Fig. 5-4.
Fig. 5-4
8
Remove the jumper wire from FA3 and ground.
8
Set the SCREEN Control to clockwise direction for
illuminating the Screen.
8
Select the G-CUTOFF mode, short between FA3 and
ground by jumper wire.
8
Set the SCREEN Control to fully counterclockwise
direction again.
8
Connect the Oscilloscope to the Cathode of the Green on
the CRT Socket Board.
8
Adjust the SUB BRIGHT so that the voltage at the
Cathode of the Green becomes 140 ± 2 V DC for WV-
CK1420, 160 ± 2 V DC for WV-CK2020 as shown in Fig.
5-5.
Deflection
Coil
Deflection Coil Fixing Screw
Purity Magnet for WV-CK1420
(Convergence Magnet-1 for WV-CK2020)
Convergence Magnet-1 for WV-CK1420
(Convergence Magnet-2 for WV-CK2020)
Convergence Magnet-2 for WV-CK1420
(Purity Magnet for WV-CK2020)
Magnet Holding Screw
2.2
±
0.05 V
GND
Adjust center of scanning periode.
