12. SUB·BRIGHTNESS
ADJUSTMENT
1.
Supply whrte color with a computer
to
the video input terminal.
2.
Turn the contrast to be MAXIMUM with the contrast volume
(fully clockwise) and BRIGHTNESS
to
be MINIMUM with the
Bright Volume (fully count clock wise).
3.
Adjust the Sub-Bright Volume (R239) to cun off the picture
slightly.
13. VERTICAL CENTER
ADJUSTMENT
Adjust the V-Center Contra! (R625), so that the center of pic-
ture
is
the same as the mechanical center of color picture tube.
14. BAND PASS
TRANS
ADJUSTMENT
(T201)
1.
Supply a video signal to the Video input terminal
2.
Connect oscilloscope probe to the base of Q202.
3.
Turn the core of
T201
so that the 3.58 MHz signal
IS
maximized.
15. 3.58 MHz TRAP (DL201)
1.
Supply a video signal to the video input terminal
2.
connect oscilloscope probe
to
the pin 27 of IC301.
3.
Turn the core of PL201 so that the 3.58 MHz signal
is
minimized.
16. WHITE BALANCE ADJUSTMENT
-13-
1.
Remove
the
input signal.
2. Remove the connector of the P351.
3.
Short the terminal TPI and TP2 with a jumber wire.
4. Turn the screen control fully counterclockwise.
5.
By rotating the
RED,
GREEN, and BLUE bias controls (R358,
R354, R362) counter clockwise from the maximum. set them
to the
1/3 position.
6.
Set
the
RED
and BLUE
DRIVE
CONTROLS (R355, R351) to
the mid-position.
7.
Turn on the Monitor.
8.
Rotate the SCREEN CONTROL gradually clockwise until the
first horizontal line appears
9.
Set
the line to be white color with the other two Bias Con·
trois (Except the first color Bias Control).
10. By Rotating the screen volume counter clockwise. adjust for
the point that the horizontal line appears faintly.
11. Remove a jumper wire between terminals TPI and
TP2.
12. Adjust the RED and BLUE
DRIVE
CONTROLS
to
obtain pro·
per white balanced picture
in
high light areas.
13. Rotate the BRIGHTNESS and CONTRAST CONTROLS to ob·
tain dark gray raster. Then check the white balance
in
low
brightness.
If
the white balance
is
not proper, retouch the
BIAS
CONTROLS and
DRIVE
CONTROLS to obtain a good white
balance
in
both low and high light area.
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