9
104S CM23 GSIII
Electrical Instructions (Continued)
6. Picture geometry setting for factory pre-set mode
6.1 General
- Pre-set contrast front control and brightness front control
to mid-position.
6.2 53.7 kHz 85 Hz mode
(apply crosshatch pattern in 800 x 600 with 53.7 kHz/85 Hz mode)
6.3 Alignment of Horizontal and vertical geometry
6.3.1 Adjust the picture width to 250 mm.
6.3.2 Adjust the H-phase to center position.
6.3.3 Adjust the picture height to 188 mm.
6.3.4 Adjust V-Position to center
Adjust/Trapezium/pincushion
6.3.5 Adjust picture tilt I CBUS for correct top/bottom lines.(Optional)
(picture tube should be mounted without tilt w.r.t. cabinet)
6.3.6 Adjust the corner by I C to straight vertical lines of the left and
right edge.
6.3.7 Adjust the parallelogram by I C to get optimum vertical line.
6.3.8 Adjust the unbalance pin by I C to get optimum vertical line.
6.3.9 Adjust the unbalance Vertical linearity balance by I C to get
optimum vertical linearity balance.
6.3.10 Adjust the unbalance Vertival linearity by I C to get optimum
vertical linearity.
6.4 Adjust size / centering / trapezium / pincushion / parallelogram
of all other preset modes via I C bus
7. Alignments of VG2 cut-off point, white tracking:
7.1 External degaussing
7.1.1 Remove ferromagnetic measuring equipment, iron table, etc.
in the neighborhood of the apparatus within the half meter.
7.1.2 positioned in the E-W direction, set has to be degaussed
externally with coil 7122 704 18001(220V)
7.1.3 Slowly increase the distance between the picture tube and
degaussing coil, keep the coil in parallel with the screen of CRT .
When the distance is more than 2m, then turn off the degaussing
current.
7.2 Apply 53.7Khz/85Hz 800 x 600 mode with 700mV 50x50mm
white block pattern.
7.3 Set brightness control at center click and contrast at Maximum
Set R,G,B cut-off at 50%
(EEPROM preload value)
R,G,B gain at 28(dec) (EEPROM preload value)
ABL
at 50%
(EEPROM preload value)
Via I C bus , set 7099 TDA 4886 contrast to minimum
7.4 With the help of a factory calibrated color analyzer CA100
set LOW R,G,B scale 100=0.12FL, X=281, y=311.
Adjust VG2(screen) until brightness gun at 100 on low brightness
scale.
7.5 Adjust the R,G,B cut - off for all gun readings to get 100 on low
brightness scale.
2
2
2
2
2
2
2
2
7.6 Set 7099 TDA4886 contrast value at 63. (dec)
7.7 Set CA100 high R,G,B scale 100 = 50 +/- 1FL
7.8 Adjust R,B gain so that blue and green have the same readings
as red on high brightness scale.
7.9 Set contrast at minimum and repeat 7.5, 7.6, 7.7, 7.8 until RGB
three guns get same readings on low and high brightness scale.
7.10 Apply full white pattern,adjust ABL via I2C to reach 30 +/- 1FL
(contrast at Max.)
7.11 Check full white at contrast and brightness at minimum, the
foreground shall be extinguished.
Apply a signal of " @ " character. at 53.6 kHz/85 Hz mode set the
brightness to mid-position , contrast to max - position and adjust
the focus for optimal sharpness in the area within 2/3 from the
screen center.
The DDC HEX data(refer sheet 190) should be written into the
EEPROM (7806) by EEPROM writer or equivalent method.
Software DDC(with 7806 model)
The DDC HEX data(refer sheet 190) should be written into the
EEPROM (7806) ,0~127 bytes by EEPROM writer or equivalent
method.
8. Focus adjustment
9. Loading DDC code
