Samsung CHA4217L Service Manual page 18

6 Alignment and Adjustments
6-2-3 Trapezoid Adjustment
CONDITIONS
Scanning frequency:
Display image:
Make the the test pattern rectangular.
2.2 mm 2.2 mm
Figure 6-4. Trapezoid
6-2-4 Parallelogram Adjustment
CONDITIONS
Scanning frequency:
Display image:
To activate the Parallelogram Adjustment
function, push both the Horizontal Position and
Vertical Position buttons and hold them in for
longer than 3 seconds, or until the power indicator
LED changes from green to blink and back to
green.
Use the Increase (+) and Decrease (Ð) buttons to
correct the display shape.
2.2 mm
Figure 6-5. Parallelogram
6-2-5 Side Pincushion Adjustment
CONDITIONS
Scanning frequency:
Display image:
After pushing the Side Pincushion button once,
push the Increase (+) and Decrease (Ð) buttons to
straighten the sides of the test pattern.
| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.2 mm.
D1
Figure 6-6. Pincushion
6-4
53.7 kHz/85 Hz (15Ó)
43.3 kHz/85 Hz (14Ó)
Crosshatch pattern
2.2 mm 2.2 mm
53.7 kHz/85 Hz (15Ó)
43.3 kHz/85 Hz (14Ó)
Crosshatch pattern
53.7 kHz/85 Hz (15Ó)
43.3 kHz/85 Hz (14Ó)
Crosshatch pattern
C2
D2
C1
6-2-6 CRT Tilt Adjustment
TILT ADJUSTMENT (CHA5807L With Tilt)
Push the V-Posi and H-Size simultaneously until
Led blinks and back on again. Push the Increase
(+) and Decrease (Ð) buttons to correct the Tilt.
A
Figure 6-7. CRT Tilt Adjustment
6-2-7 Vertical Linearity Adjustment
To activate the vertical linearity adjustment, push
both the horizontal position and horizontal size
buttons and hold then in for longer than 3
seconds, or until the power indicator LED changes
from green to blink and back to green.
Use the Increase (+) and Decrease (Ð) buttons to
correct the display shape.
6-2-8 Pin Balance Adjustments
To activate the pin balacne function, push both the
horizontal position and vertical Size buttons and
hold then in for longer than 3 seconds, or until the
power indicator LED changes from green to blink
and back to green.
Use the Increase (+) and Decrease (Ð) buttons to
correct the display shape.
6-2-9 Degauss
Push the contrast and brightness buttons
simultaneously. The degaussing circuit can
effectively function only once per 30 minutes. If
available, use an external degaussing coil during
servicing.
6-2-10 Delete User Mode Data
To delete the picture data from the user modes,
push the contrast button and side pincushion
button for 5 or more seconds simultaneously.
6-2-11 Recall
To delete the picture data from current user mode,
push the contrast button and trapzoid button for 5
or more seconds simultaneoulsy.
B
C
FRONT BEZEL
BACK RASTER
D
CHA42*7L/5**7L