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(8). Screen Cut off Fine Adjustment
Adjust:
SCREEN Control of Flyback Transformer
Main Board
Observe:
Video Monitor Screen
8
Supply the Grayscale signal to the Video Input Connector.
8
Adjust the SCREEN control so that the 8th step of the stair
step becomes cut off.
(9). Purity Adjustment
Adjust:
Purity Magnet
Deflection Coil
Observe:
Video Monitor Screen
8
This adjustment should be done after aging for more than
20 minutes.
8
Adjust the FOCUS control on the Flyback Transformer for
the best focus and then disconnect the input signal.
8
Degauss the CRT screen with a degaussing coil.
8
Loosen the deflection coil fixing screw as shown in Fig. 4-5.
8
Move back the deflection coil until it reaches to the purity
magnet.
Fig. 4-5
8
Supply the Red Raster signal to the Video Input
Connector.
8
Adjust the purity magnet so that the red area comes to the
center on the CRT screen as shown in Fig. 4-6.
Fig. 4-6
8
Rotate the deflection coil to find the point where the center
portion of the red area becomes equal on the CRT screen.
8
Move the deflection coil forward until the red colour fully
occupies the entire screen and tighten the screws that
secure the deflection coil.
Note: For WV-CM1480/WV-CM1780, do not adjust two
variable resistors and magnets on the Deflection
Coil as shown in Fig. 4-7.
Fig. 4-7
(10). Convergence Adjustment
Adjust:
Convergence magnet-1
Convergence magnet-2
Observe:
Video Monitor Screen
8
Supply the Crosshatch signal or the Dot Signal to the
Video Input Connector.
8
Adjust the FOCUS control on the Flyback Transformer for
the best focus.
8
Degauss the CRT screen with a degaussing coil.
8
Adjust the Convergence magnet-2 so that the red and blue
dots on the center area of the CRT screen is overlapped.
8
Adjust the Convergence magnet-1 so that the green and
magenta (red+blue) dots on the center area of the CRT
screen is overlapped.
8
Repeat above adjustment until no discrepancy appears on
the entire screen.
Deflection coil fixing screw
Purity magnet
Convergence magnet-1
Convergence magnet-2
Deflection coil
Magnets
Variable Resistors
RED
RED
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