Page 1
16
109B2 GS3 CM25
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Electrical Instructions
0. General
When carry-out the electrical settings in many cases a video
signal must be applied to the monitor. A computer with :
- ATI GPT-1600 (4822 397 10065), Mach 64 (up to 107kHz)
are used as the video signal source. The signal patterns
are selected from the "service test software" package, see
user guide 4822 727 21046 (GPT-1600).
0.1 This monitor has 35 factory-preset modes as below:
640 x 350 37.9 kHz/85 Hz 1152 x 870 68.7 kHz/75 Hz
640 x 400 31.5 kHz/70 Hz 1152 x 900 71.8 kHz/76 Hz
640 x 480 31.5 kHz/60 Hz 1280 x 960 60.0 kHz/60 Hz
640 x 480 37.9 kHz/72 Hz 1280 x 960 85.9 kHz/85 Hz
640 x 480 37.5 kHz/75 Hz 1280 x 1024 63.9 kHz/60Hz
640 x 480 43.3 kHz/85 Hz 1280 x 1024 79.9 kHz/75 Hz
640 x 480 50.6 kHz/100 Hz 1280 x 1024 91.1 kHz/85 Hz
72
0 x 400 31.5 kHz/70 Hz 1600 x 1200 75.0 kHz/60 Hz
720 x 400 37.9 kHz/85 Hz 1600 x 1200 81.3 kHz/65 Hz
800 x 600 37.9 kHz/60 Hz 1600 x 1200 87.5 kHz/70 Hz
800 x 600 48.1 kHz/72 Hz 1600 x 1200 93.8 kHz/75 Hz
800 x 600 46.9 kHz/75 Hz 1792 x 1344 83.6 kHz/60 Hz
800 x 600 53.7 kHz/85 Hz 1856 x 1392 86.3 kHz/60 Hz
800 x 600 63.9 kHz/100 Hz 1920 x 1440 90.0 kHz/60 H
832 x 624 49.7 kHz/75 Hz
1024 x 768 48.4 kHz/60 Hz
1024 x 768 56.5 kHz/70 Hz
1024 x 768 60.0 kHz/75 Hz
1024 x 768 68.7 kHz/85 Hz
1152 x 864 67.5 kHz/75 Hz
1152 x 864 77.1 kHz/85 Hz
z
0.2 With normal VGA card:
If not using the ATI card during repair or alignment, The
service engineer also can use this service test software
adapting with normal standard VGA adaptor and using
standard VGA mode 640 x 480, 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 (3165) 79Vdc
- Apply a video signal in the 1024 x 768 with 68.7 kHz/85Hz
mode.
- Select the "cross-hatch" pattern.
- Set the brightness control and the contrast control to the
minimum position.
- Pre-set trimming potentiometer R3165(B+) and
R3587(EHT) in mid-position.
- Set Vg2 (screen) to fully Counter-clockwise (zero
beamcurrent).
- Connect a dc voltmeter between the joint of C2152 and
ground (common ground).
- Set the B+ trimming potentiometer 3165 so that the reading
on the dc voltmeter is 190.0 V +/- 0.5 Vdc.
2. High-voltage EHT (3587)
- Apply a video signal in the 1024 x 768 with 68.7 kHz/85Hz
mode.
- Select the "cross-hatch" pattern.
- Set the brightness control and the contrast control to the
minimum position.
- Connect a "high-voltage voltmeter" between the highvoltage connection of the picture tube and earth.
- Turn on the power.
- Set the EHT trimming potentiometer R3587 so that the
"high- voltage voltmeter" reads 26.5 KV +/- 0.5 KV .
- Turn off the power.
- Remove the "high-voltage voltmeter" from the picture tube.
- Turn on the power again.
3. Monitor the following auxiliary voltages.
SOURCE ACROSS C2152 + 190.0V +/- 1.0VDC.
SOURCE ACROSS C2154 + 79.0V +/- 1.0VDC.
SOURCE ACROSS C2156 - 6.3V +/- 0.3VDC.
SOURCE ACROSS C2160 + 13.5V +/- 0.5VDC.
SOURCE ACROSS C2157 - 13.5V +/- 0.5VDC.
4. General conditions for alignment
4.1 During all alignments, supply a distortion free AC mains
voltage to set via an isolating transformer with low internal
impedance.
4.2 Align in pre-warmed condition, at least 30 minutes warmup with nominal picture brightness.
4.3 Purity, geometry and subsequent alignments should be
carried out in magnetic cage with correct magnetic field.
Northern hemisphere : H=0, V=430+/-50 mG, Z=0
Southern hemisphere : H=0, V=-520+/-50 mG, Z=0
4.4 All voltages are to be measured or applied with respect to
ground.
Note: Do not use heatsink as ground.
4.5 Adjust function controls " " to center position except
for contrast control which should be set to MAX.
5. To access factory mode:
- Turn off monitor (don't turn off PC)
- Press " " and " " simultaneously on the front
control panel, then press " ",wait till the OSD menu
with characters " factory mode (below OSD menu)" come
on the screen of monitor.
00115
109B2 V1.52 20000619
- If OSD menu disappears on the screen of monitor, press
" " again (anytime), then the OSD menu comes on the
screen again.
- using " " : to select OSD menu.
: to increase or decrease the setting.
- Using " " to confirm the selection.
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Page 2
Electrical Instructions (Continued)
109B2 GS3 CM25
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17
6 To leave factory mode
* After alignment of factory mode, turn off monitor (if you do
not turn off monitor, the OSD menu is always at the factory
mode), then turn on monitor again (at this moment, the
OSD menu goes back to user mode).
TIMER Set OSD display time.
7. Alignment of Vg2 cut-off point, white tracking (OSD
control)
Equipment : 1. Video Test Generator-801GC (Quantum
Data)
2. Color-analyzer (Minolta CA-100)
VG2 [(screen), at the bottom of the L.O.T.].
* Apply a video signal in the 1024 x 768 with 68.7 kHz/85 Hz
mode,
select the "full white pattern" (sizes 355 x 265 mm).
* Use color-analyzer (Minolta CA-100) to adjust cutoff and
2
white uniformity.
OSD R/G/B cut-off and R/G/B gain can be accessed, with
initial data:
9300 K
°
R cutoff = 40%, R gain = 65% (I C)
G cutoff = 40%, G gain = 65% (I C)
B cutoff = 40%, B gain = 65% (I C)
2
2
2
9300 BIAS R G B GAINRGB
6500 BIAS R G B GAINRGB
5500 BIAS R G B GAINRGB
FOCUS(H V) VLINBAL USER
RASTER(H V) LIN ( H V ) SUB
V(OFFSET GAIN) SUB
CORNER(T B) ABL
LF(BRIGH SHARP)
EXIT
135
BIASRGB:R(red) G(green) B(blue) cutoff
GAINRGB:R(red) G(green) B(blue) gain
V FOCUS : Vertical Focus
H FOCUS : Horizontal Focus
VLIN BAL : Vertical Linearity Balance
USER : Horizontal size range
RASTER H: Horizontal raster Shift
RASTER V: Vertical raster Shift
HLIN : Horizontal Linearity
V LIN : Vertical Linearity
SUB : Zoom Control range
SUB : Sub Contrast
V OFFSET : Vertical offset
V GAIN : Vertical Gain
ABL : Auto Beam Limit
T CORNER: Corner Correctionof TOP
B CORNER: Corner Correctionof BOTTOM
Fig. 2.2
9300 BIAS R G B GAINRGB
6500 BIAS R G B GAINRGB
5500 BIAS R G B GAINRGB
FOCUS(H V) VLINBAL USER
RASTER(H V) LIN ( H V ) SUB
V(OFFSET GAIN) SUB
CORNER(T B) ABL
LF(BRIGH SHARP)
EXIT
135
LF : LightFrame
After pressing " " ,then Press " "
.
Fig. 2.3
°
6500 K
R cutoff = 40%, R gain = 55% (I C)
G cutoff = 40%, G gain = 55% (I C)
B cutoff = 40%, B gain = 55% (I C)
°
5500 K
R cutoff = 40%, R gain = 55% (I C)
G cutoff = 40%, G gain = 55% (I C)
B cutoff = 40%, B gain = 55% (I C)
Brightness = 50%, Sub-Contrast = 85%, ABL = 70% (I C)
2
2
2
2
2
2
2
Step 1: To select the character "FACTORY MODE" as shown
in Fig. 2.1, press " " to access the OSD menu for
R/G/B gain & cutoff as shown in Fig. 2.2.
Step 2: Press " " for function selection as shown in Fig
2.3.
Step 3: Use " " to increase or decrease the value as
shown in Fig. 2.3.
00115
Fig.2.1
7.1 Connect the video input, set brightness control at 50%
and contrast at minimum position (OSD), Vg2 at Minimum
(counter clockwise, and ABL (OSD) at 50% position.
Slowly increase Vg2 voltage until light output is at
0.1 Ft-L +/- 0.01Ft-L (Y=0.1 Ft-L, on the screen of CA-
100).
7.2 (The screen of monitor is dark now)
: Press " " to show the OSD menu as shown in Fig.
2.1.
: Select the character "FACTORY MODE" to access the
R/G/B adjustment as shown in Fig. 2.2 and Fig. 2.3.
: Adjust the cutoff of R/G/B to get 9300K
(x=0.283 +/- 0.015, y=0.297 +/- 0.015), and brightness
output at 0.07 +/- 0.01 Ft-L (Y=0.07Ft-L).
7.3 : Press " " to set contrast at maximum (100%).
: Adjust gain of R/G/B to get 9300K
(x=0.283 +/- 0.015, y=0.297 +/-0.015, don't care about
the Y value)
7.4 Apply a small white square 10 x 10 cm pattern, brightness
set to center (50%), and contrast at maximum (100%),
adjust Sub-contrast control (OSD) to reach 44 +/- 1 Ft-L.
7.5 Apply full white pattern at 9300K, adjust ABL (OSD) to
reach 30+/- 1 Ft-L (contrast at maximum 100%,
brightness at center 50%).
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109B2 V1.52 20000619
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Page 3
109B2 GS3 CM25
18
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Electrical Instructions (Continued)
7.6 : Select the 6500K colour temperature as shown in Fig.
2.2.
: Adjust the R/G/B cutoff and R/G/B gain as shown in
procedure 7.2~7.3 to get
R/G/B cutoff x= 0.313 +/- 0.015
y= 0.329 +/- 0.015
R/G/B gain x= 0.313 +/- 0.015
y= 0.329 +/- 0.015
Y= 38 +/- 1 Ft-L
7.7 : Select the 5500K colour temperature as shown in Fig.
2.2.
: Adjust the R/G/B cutoff and R/G/B gain as shown in
procedure 7.2~7.3 to get
R/G/B cutoff x= 0.332 +/- 0.015
y= 0.347 +/- 0.015
R/G/B gain x= 0.332 +/- 0.015
y= 0.347 +/- 0.015
Y= 33 +/- 1 Ft-L
8. Picture geometry setting (factory pre-set modes)
- Apply a video signal with cross-hatch pattern.
- Apply a video signal in the 1024 x 768 with 68.7 kHz/85 Hz
mode.
- Set brightness and contrast controls to their center positions
(OSD control).
9. Focus adjustment
: Apply a video signal in the 1600 x 1200 with 93.8 kHz/75
Hz mode
: Select " @ " pattern.
: Set the brightness at center (50%) and the contrast to 25
FL.
: Adjust focus potentiometers (top of L.O.T.) Focus 1 for
horizontal focus and Focus 2 for vertical focus so that the
picture at 2/3 of the diagonal lines (from center to four
corners) of the displayed screen is as sharp as possible.
10. Loading DDC code
into the DDC IC by EEPROM writer or EDID301.EXE
program and Software DDC Alignment Kit.
The DDC HEX data should be written
8.1 Horizontal geometry (OSD control)
- Adjust the H-width to 355 mm
- Adjust the H-phase to center position.
8.2 Vertical geometry (OSD control)
- Adjust vertical size to 265 mm
- Adjust V-phase to center position.
8.3 Trapezoid distortion (OSD control)
- Adjust the trapezoid to get optimal vertical lines.
8.4 Pincushion (OSD control)
- Adjust the pincushion to get optimal vertical line.
8.5 Parallelogram (OSD control)
- Adjust parallelogram so that vertical lines are vertical or
symmetrically about the center vertical axis.
8.6 Unbalance-pin (OSD control)
- Adjust the unbalance-pin so that that vertical border lines
are aligned symmetrically.
8.7 Rotation (OSD control)
- Adjust picture so that vertical tilt is less than +/- 0.5mm.
8.8 Top/Bottom corner(control)
- Adjust the top/bottom corner control to get optimum corner
geometry.
8.9 Store the preset results by selecting the "exit" (OSD
control).
8.10 Repeat the procedure 8.1 to 8.9 until all the preset
timings have been adjusted completely
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Page 4
Electrical Instructions (Continued)
Item Resolution Freq. V x H Pixel rate(Mhz) Remark
1 640x350 85(37.861k) 31.500 VESA
2 640x350 70(31.469k) 25.175 VGA
3 640x480 60(31.469k) 25.175 VGA
4 72.8(37.861k) 31.500 VESA
5 75(37.500k) 31.500 VESA
6 85(43.269k) 36.000 VESA
7 100.1(50.60k) 40.500 SNI
8 720x400 70(31.469k) 28.321 VGA
9 85(37.927k) 35.500 VESA
10 800x600 60.3(37.879k) 40.000 VESA
11 72.12(48.077k) 50.000 VESA
12 75(46.875k) 49.500 VESA
@13 85(53.674k) 56.250 VESA
14 100.1(63.90k) 67.500 SNI
15 832x624 74.6(49.725k) 57.280 MAC
16 1024x768 60(48.363k) 65.000 VESA
17 70(56.476k) 75.000 VESA
@18 75(60.000k) 78.750 VESA
@19 84.997(68.677k) 94.500 VESA
20 1152x864 75(67.500k) 108.000 VESA
21 85(77.100k) 121.500 VESA/P
22 1152x870 75(68.681k) 100.000 MAC
23 1152x900 76(71.800k) 108.000 SUN
24 1280x960 60(60.000k) 108.000 VESA
25 85(85.938k) 148.500 VESA
26 1280x1024 60(63.981k) 108.000 VESA
@27 75(79.976k) 135.000 VESA
@28 85(91.146k) 157.500 VESA
29 1600x1200 60(75.000k) 162.000 VESA
30 65(81.250k) 175.500 VESA
31 70(87.500k) 189.000 VESA
@32 75(93.750k) 202.500 VESA
33 1792x1344 60(83.640k) 204.750 VESA/P
34 1856x1392 60(86.333k) 218.250 VESA/P
35 1920x1440 60(90.000k) 234.000 VESA/P
109B2 GS3 CM25
19
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CHARACTER
FOR FOCUS
C
A
D
B
m
m
65
2
Back
355 mm
A,B<2.0mm C,D<2.0mm
IMAGE GEOMETRY
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Page 5
20
109B2 GS3 CM25
Electrical Instructions (Continued)
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1. Purity adjustment
- Make sure the monitor is not exposed to any
external magnetic field.
- 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
by moving the two tabs (2-pole) in such a manner
that they advance in an opposite direction but at
the same time to obtain the same angle between
the two tabs, which should be approximately 180
degree.
- Check by full green pattern and full blue pattern
again to observe their respective color purity.
2. Static convergence
2-pole purity magnet
6-pole convergence magnet
4-pole convergence magnet
Deflection Yoke
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
are the 4-pole magnet and the 6-pole magnet.
The 4-pole magnet move the outermost electron
beams (R and B) parallel in the opposite direction
from the other. The 6-pole magnet moves the
outermost electron beam (R, B and G) parallel in the
opposite direction from the other.
The magnetic field of the above magnets do not affect
the center of the CRT neck.
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.
4-pole Beam motion producced by the
4-pole convergence magnet
S
B
N
Beam displacement
direction
6-pole
N
G
R
S
N
B
Magnetic flux
lines
Beam motion producced by the
6- pole convergence magnet
N
S
B
N
S
R
G
N
S
S
B
N
G
S
S
G R
S
N
N
S
R
N
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