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(10). Focus Coarse Adjustment
Adjust:
FOCUS control
Flyback Transformer on the Main Board
Observe:
Colour Video Monitor
8
Supply the Cross Hatch signal or the Dot signal to the
Video Input Connector.
8
Adjust the FOCUS control for the best focus.
(11). Purity Adjustment
Adjust:
Purity Magnet
Deflection Coil
Observe:
Colour Video Monitor
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 screw that secure the deflection coil.
8
Move back the deflection coil until it reaches to the purity
magnet.
Fig. 4-6
8
Supply the red colour 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. 4-7.
Fig. 4-7
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.
(12). Convergence Adjustment
Adjust:
Convergence magnet-1
Convergence magnet-2
Observe:
Colour Video Monitor
8
Supply the Cross Hatch 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.
(13). White Balance Adjustment
Adjust:
CUTOFF R
Increment Button (+)
Decrement Button (–)
CUTOFF B
Increment Button (+)
Decrement Button (–)
DRIVE R
Increment Button (+)
Decrement Button (–)
DRIVE B
Increment Button (+)
Decrement Button (–)
Observe:
Colour Video Monitor
8
Supply the White Colour signal or the Dot Signal to the
Video Input Connector.
8
Select the MENU Button to the W/B MENU.
8
Select the Cursor Buttons (
i
) or (
o
) to the CUTOFF R,
CUTOFF B, DRIVE R or DRIVE B position.
8
Adjust the Increment Button (+) or Decrement Button (–)
so that the raster on the CRT Screen becomes White.
(14). Sub Bright Adjustment
Adjust:
STD BRIGHT
Increment Button (+)
Decrement Button (–)
Observe:
Colour Video Monitor
8
Supply the Grayscale signal to the Video Input Connector.
8
Isolate the CRT screen from the outside light source.
8
Select the MENU Button to the SUB MENU.
NO GOOD
GOOD
RED
RED
Deflection coil
Deflection coil fixing screw
Purity magnet
Convergence magnet-1
Convergence magnet-2
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