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22 105S2 CM23 GSIII Electrical Adjustments
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0. General 3.Monitor the following auxiliary voltages.

When carry-out the electrical settings in many cases a video signal SOURCE ACROSS C2153 and GRN +183.0V +/- 1.5 VDC
must be applied to the monitor. A computer with : SOURCE ACROSS C2156 +81.0V +/- 0.5 VDC.
SOURCE ACROSS C2164 +6.2V +/- 0.3 VDC.
- ATI GPT-1600 (4822 397 10065), Mach 64 (up to 107kHz) SOURCE ACROSS C2158 +12.7V +/- 0.5 VDC.
SOURCE ACROSS C2162 - 12.7V +/- 0.5 VDC.
are used as the video signal source. The signal patterns are selected
from the "service test software" package, see user guide 4822 727 4. General conditions for alignment
21046 (GPT-1600).
4.1 During all alignments, supply a distortion free AC mains voltage
to set via an isolating transformer with low internal impedance.
0.1 This monitor has 6 factory-preset modes as below. 4.2 Align in pre-warmed condition, at least 30 minutes warm-up with
720 x 400 31.5 kHz/70 Hz nominal picture brightness.
640 x 480 31.47 kHz/60 Hz 4.3 Purity, geometry and subsequent alignments should be carried
640 x 480 43.3 kHz/85 Hz out in magnetic cage with correct magnetic field.
800 x 600 46.9 kHz/75 Hz
800 x 600 53.67 kHz/85 Hz Northern hemisphere : H=0, V=450 mG, Z=0
1024x768 60.0 kHz/75 Hz Southern hemisphere : H=0, V=-500 mG, Z=0
Equatorial Support : H=0, V=0 mG, Z=0
12 factory-preload modes as below
640 x 350 31.5 kHz/70 Hz 832 x 624 49.7 kHz/74.5 Hz 4.4 All voltages are to be measured or applied with respect to ground.
640 x 350 37.9 kHz/85 Hz 1024 x 768 56.5 kHz/70 Hz Note: Do not use heatsink as ground.
640 x 480 37.5 kHz/75 Hz 1280 x 960 60 kHz/60 Hz 4.5 Adjust brightness controls to center position except for contrast
640 x 480 37.9 kHz/72.8 Hz 800 x 600 48.1 kHz/72Hz control which should be set to MAX.
800 x 600 37.9 kHz/60 Hz 640 x 480 5.06kHz/100Hz
720 x 400 37.9 kHz/85 Hz
1024 x 768 48.3kHz/60Hz 5. To access factory mode:

0.2 With normal VGA card: - Turn off monitor (don't turn off PC)
If not using the ATI card during repair or alignment, The service - Press " " and " " simultaneously on the front control panel
engineer also can use this service test software adapting with normal ,then press " ",wait till the OSD menu with characters
standard VGA adaptor and using standard VGA mode 640 x 480, " factory mode (below OSD menu)" come on the screen of monitor.
31.5 kHz/60 Hz (only) as signal source.

0.3 AC/DC Measurement:
The measurements for AC waveform and DC figure is based on 640 x
480 31.5 kHz/60 Hz resolution mode with test pattern "gray scale".
Power input: 110V AC

1. B+ supply voltage

- Apply a video signal in the 640 x 480 with 31.5 kHz/60Hz mode.
- Select the "cross-hatch" pattern.
- Set the brightness control and the contrast control to the minimum
position.
- Pre-set trimming potentiometer R3178(B+) and R3540 (EHT)
MODEL SELECT
in mid-position.
- Set Vg2 (screen) to fully Counter-clockwise (zero beamcurrent).
- Connect a dc voltmeter between the joint of capacitor C2156 and
ground (common ground). ASUS15 V2.21 2000406
- Set the B+ trimming potentiometer R3178(B+) so that the reading
on the dc voltmeter is 81V +/- 0.2 Vdc. - If OSD menu disappears on the screen of monitor, press " "
again (anytime), then the OSD menu comes on the screen again.
2. High-voltage EHT - using " " : to select OSD menu.
- using " " : to increase or decrease the setting.
- Apply a video signal in the 640 x480 with 31.5 kHz/60Hz mode.
- Select the "cross-hatch" pattern. - Using " " to confirm the selection.
- Set the brightness control and the contrast control to the minimum
position. 5.1. To leave factory mode
- Turn off the power.
- Connect a dc voltmeter between the joint of capacitor C2643 and * After alignment of factory mode, turn off monitor (if you do not turn
ground (common ground). off monitor, the OSD menu is always at the factory mode), then turn
- Turn on the power. on monitor again (at this moment, the OSD menu goes back to user
- Set the EHT trimming potentiometer R3540 so that the reading on mode).
the dc voltmeter is 67.0V+/-0.2V (for PHI and CPT CRT).

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Electrical Adjustments (Continued) 105S2 CM23 GSIII 23
9 Go to cover page
6. Picture geometry setting
9300 BIAS R G B GAIN R G B
- Apply a video signal with cross-hatch pattern. 6500 BIAS R G B GAIN R G B
6.2 Apply a video signal in the 1024 x 768 with 60 kHz/75 Hz mode. FOCUS(H V) VLIN BAL USER
6.3 Set contrast control at Max. position, and brightness control in RASTER(H V) LIN ( H V ) SUB
Fig. 2.2
the mid-point. SUB T CORNER ABL
6.4 Alignment of horizontal geometry and vertical geometry H EHT
6.4.1 Adjust the H-width to 270 mm EXIT
174
6.4.2 Adjust the H-phase to center position.
6.4.3 Adjust V-size to 202mm.
6.4.4 Adjust V-Position to center.
Adjust/Trapezium/pincushion
6.4.5 Adjust picture tilt via I2C BUS for correct top/bottom lines. BIAS R G B : R(red) G(green) B(blue) cutoff
6.4.6 Adjust the top and bottom corner by I2C to straight vertical lines GAIN R G B : R(red) G(green) B(blue) gain
of the left and right edge. FOCUS : Horizontal and Vertical Focus
6.4.7 Adjust the parallelogram by I CBUS to get optimum vertical line.
2
VLIN BAL : Vertical Linearity Balance
6.4.8 Adjust the unbalance pin by I C BUS to get optimum vertical
2
USER : Horizontal size range
line. RASTER H: Horizontal DC (raster) Shift
6.4.9 Adjust the unbalance Vertical linearity balance by I C BUS to RASTER V: Vertical DC (raster) Shift
2

get optimum vertical linearity balance. HLIN : Horizontal Linearity
6.4.10Adjust the unbalance Vertical linearity by I C to get optimum V LIN : Vertical Linearity
2

vertical linearity. SUB : Zoom range
6.5 Adjust size/centering/trapezium/pincushion/parallelogram SUB : Sub Contrast
of all other preset modes via I C bus. T CORNER: Corner Correctionof TOP
2

6.6 Preset factory preload timing according to step 6.5 values. ABL : Auto Beam Limit
H EHT : Horizontal Extensive High Tension
7. Alignment of Vg2 cut-off point, white tracking
7.2 Connect the video input, set brightness control at center, and
Equipment : 1. Video Test Generator-801GC (Quantum Data) contrast control at maximum
2. Color-analyzer (Minolta CA-100) 7.3
VG2 [(screen), at the bottom of the L.O.T.]. set R,G,B cut-off at 127 9300k and 6500K(EEPROM preload value)
* Apply a video signal in the 1024 x 768 with 60 kHz/75 Hz mode, R,G,B gain at 77 9300k and 6500K(EEPROM preload value)
select the "full white pattern" (sizes 270 x 202 mm). ABL at 127 9300k and 6500K(EEPROM preload value)
* Use color-analyzer (Minolta CA-100) to adjust cutoff and SUB-CON at 218 (EEPROM preload value)
white uniformity. 7.4 Adjust 9300K color:
With the help of a factory calibrated color analyzer CA 100
OSD R/G/B cut-off and R/G/B gain can be accessed, with set low R,G,B scale 100=0.12FL,x=283,y=297
initial data: Adjust Vg2 until brightest gun at 100 on low brightness scale.
7.5 Adjust R,G,B cut-off for all gun reading to get 100 on low
9300 oK brightness scale.
R cutoff = 25%, R gain = 65% (I2 C) 7.6 Set CA100 high R,G,B scale 100 = 41+/- 1FL,X=283,y=297
G cutoff = 25%, G gain = 65% (I C)
2
Adjust G gain at 100 scale on high brightness scale.
B cutoff = 25%, B gain = 65% (I C)
2
7.7 Adjust R,B gain so that blue and green have the same reading as
red on the high brightness scale
6500 K
o
7.8 Set contrast at minimum and repeat 7.5,7.6,7.7,until RGB three
R cutoff = 25%, R gain = 55% (I C)
2
guns get same readings on low and high brightness scale.
G cutoff = 25%, G gain = 55% (I C)
2
7.8.1 Adjust SUB-CON to get Y=41+/- 1FL
B cutoff = 25%, B gain = 55% (I C)
2
7.8.2 Apply full white pattern, Adjust ABL to reach 30+/- 1FL(contrast
at Max.)
Brightness = 50%, Sub-Contrast = 85%, ABL = 50% (I C)
2
7.9 Adjust 6500K color:
With the help of a factory calibrated color analyzer CA 100
Step 1: To press power button switch and left & right set low R,G,B scale 100=0.12FL,x=313,y=329
simulaneously to entert the character "ASUS15 V2.21 7.10 Adjust the R,G,B cut-off for all gun reading to get 100 on low
20000406" as shown in Fig.2.1, press " " to access the brightness scale.
OSD menu for R/G/B gain & cutoff as shown in Fig. 2.2. 7.11 Set CA100 high R,G,B scale 100 = 41+/- 1FL,X=313,y=329
Step 2: Press " " for function selection as shown in Fig. 2.2. Adjust G gain at 100 scale on high brightness scale.
7.12 Adjust R,B gain so that blue and green have the same reading
as red on the high brightness scale
7.13 Set contrast at minimum and repeat 7.10,7.11,7.12,until RGB
three guns get same readings on low and high brightness
scale.
7.14 Check full white at contrast and brightness at minimum, the
foreground shall be extinguished.

MODEL SELECT

ASUS15 V2.21 20000406

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24 105S2 CM23 GSIII Electrical Adjustments (Continued)
9 Go to cover page

8. Focus adjustment

Apply a signal of " @ " character. at 68.7 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.

9. Loading DDC code
The DDC HEX data should be written into the EEPROM
(7803,7804) by EEPROM writer or equivalent method.

a: Service DDC Kit
DDC Module (DDC cable), Part number = 4822 320 12004 2-pole purity magnet
DDCV2u.EXE software (3.5" disk), Part number = 4822 711 00024 6-pole convergence magnet
b: Please refer to Service information 4822 727 21995 for using 4-pole convergence magnet
the Service DDC Kit. Deflection Yoke

10. Purity adjustment

- Make sure the monitor is not exposed to any 4-pole Beam motion producced by the
external magnetic field. 4-pole convergence magnet
- Produce a full red pattern on the screen, adjust the
purity magnet rings on the PCM assy (on CRT) to
obtain a complete field of the color red. This is done S
S N
by moving the two tabs (2-pole) in such a manner
that they advance in an opposite direction but at
B G R N B G R N
the same time to obtain the same angle between
the two tabs, which should be approximately 180
degree. N S
S
- Check by full green pattern and full blue pattern
again to observe their respective color purity.
Beam displacement Magnetic flux
11. Static convergence direction lines

Introduction
Slight deviation in the static convergence can be
corrected by using two permanent pairs of magnets
which are fitted around the neck of the CRT. These 6-pole Beam motion producced by the
are the 4-pole magnet and the 6-pole magnet. 6- pole convergence magnet
The 4-pole magnet move the outermost electron
beams (R and B) parallel in the opposite direction N
S N
from the other. The 6-pole magnet moves the
outermost electron beam (R, B and G) parallel in the S S
opposite direction from the other. B G R N B G R S
The magnetic field of the above magnets do not affect
the center of the CRT neck. N N
S N
S
Setting
- Before the static convergence setting can be made,
the monitor must be switched on for 30 minutes.
- The focus setting must be made correctly.
- Signal: 640 * 480, 31.5 kHz/60 Hz mode.
- Set the tabs of the 4-pole magnet in the neutral
position. This is when the tabs are opposite one
another. In this position the magnets do not affect the
deflection of the R and B electron beams.
- Set the tabs of the 6-pole magnet in the neutral
position. This is when the tabs are opposite one
another. In this position the magnets do not affect the
deflection of the R, B, and G electron beams.
- First set the 4-pole magnet optimally.
- Then set the 6-pole magnet optimally.
- If the convergence is not now optimal, then adjust to
the optimal setting with the 4-pole magnet and then with
the 6- Pole magnet again.
- Set the tabs of the 6-pole magnet in the neutral
position. This is when the tabs are opposite one
another. In this position the magnets do not affect the
deflection of the R, B, and G electron beams.
- First set the 4-pole magnet optimally.
- Then set the 6-pole magnet optimally.
- If the convergence is not now optimal, then adjust to
the optimal setting with the 4-pole magnet and then
with the 6- pole magnet again.

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