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Electrical Adjustments 107P2 CM25 GSIII 23
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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 C2152 and GND. +185.0V +/- 1.5 VDC
must be applied to the monitor. A computer with : SOURCE ACROSS C2154 + 82.0V +/- 1.5 VDC.
SOURCE ACROSS C2156 - 6.4 V +/- 0.3 VDC.
- ATI GPT-1600 (4822 397 10065), Mach 64 (up to 107kHz) SOURCE ACROSS C2160 +13.5V +/- 0.5 VDC.
SOURCE ACROSS C2157 - 14.0V +/- 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
21046 (GPT-1600).
4. General conditions for alignment
0.1 This monitor has 9 factory-preset modes as below. 4.1 During all alignments, supply a distortion free AC mains voltage
1. 640 x 350 31.5 Khz 70 HZ(VESA) to set via an isolating transformer with low internal impedance.
2. 640 x 400 31.5 Khz 70 HZ(VESA) 4.2 Align in pre-warmed condition, at least 30 minutes warm-up with
nominal picture brightness.
3. 640 x 480 43.2 Khz 85 HZ(VESA)
4.3 Purity, geometry and subsequent alignments should be carried
4. 800 x 600 46.9 Khz 75 HZ(VESA) out in magnetic cage with correct magnetic field.
5. 800 x 600 53.7 Khz 85 HZ(VESA)
6. 1024 x 768 60.0 Khz 75 HZ(VESA) Northern hemisphere : H=0, V=430 +/- 50 mG, Z=0
7 1024 x 768 68.7 Khz 85 HZ(VESA) Southern hemisphere : H=0, V=-520 +/-50 mG, Z=0
8. 1280 x 1024 80.0 Khz 75 Hz (VESA)
9. 1280 x 1024 91.1 Khz 85 Hz (VESA) 4.4 All voltages are to be measured or applied with respect to ground.
0.2 With normal VGA card: Note: Do not use heatsink as ground.
4.5 Adjust brightness controls to center position except for contrast
If not using the ATI card during repair or alignment, The service control which should be set to MAX.
engineer also can use this service test software adapting with normal
standard VGA adaptor and using standard VGA mode 1024 x 768,
68.7 kHz/85 Hz (only) as signal source. 5. To access factory mode:
0.3 AC/DC Measurement: - Turn off monitor (don't turn off PC)
- Press " " and " " simultaneously on the front control panel
The measurements for AC waveform and DC figure is based on 1024 ,then press " ",wait till the OSD menu with characters
x 768 68.7 kHz/85 Hz resolution mode with test pattern "gray scale". " factory mode (below OSD menu)" come on the screen of monitor.
Power input: 110V AC
1. B+ supply voltage (3165) 84Vdc 00195
- 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 3165(+) and 3698(EHT)
in mid-position.
- Set Vg2 (screen) to fully Counter-clockwise (zero beamcurrent).
- Connect a dc voltmeter between the joint of capacitor 2152 and
ground (common ground).
- Set the B+ trimming potentiometer 3165 so that the reading on the
dc voltmeter is 185 V +/- 0.2 Vdc.
2. High-voltage EHT (3698)
107PVE V 1.44 000427
- Apply a video signal in the 1024 x 768 with 68.7kHz/85Hz mode.
- Select the "cross-hatch" pattern.
- Set the brightness control and the contrast control to the minimum - If OSD menu disappears on the screen of monitor, press " "
position. again (anytime), then the OSD menu comes on the screen again.
- Connect a "high-voltage voltmeter" between the high-voltage - using " " : to select OSD menu.
connection of the picture tube and earth. - using " " : to increase or decrease the setting.
- Turn on the power. (Please also refer to page 8 to page 15 for OSD adjustment)
- Set the EHT trimming potentiometer 3698 so that the "high- - Using " " to confirm the selection.
voltage voltmeter" reads 25.0 kV +/- 0.2 kV .
- Turn off the power. 5.1. To leave factory mode
- Remove the "high-voltage voltmeter" from the picture tube.
- Turn on the power again. 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).
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24 107P2 CM25 GSIII Electrical Adjustments (Continued)
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6. Picture geometry setting
- 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 contrast control at Max. position, and brightness control in the
mid-point.
6.4 Alignment of horizontal geometry and vertical geometry
6.4.1 Adjust the H-width to 306 mm
6.4.2 Adjust the H-phase to center position.
6.4.3 Adjust V-size to 230mm.
6.4.4 Adjust V-Position to center.
Adjust/Trapezium/pincushion
Fig. 2.2
6.4.5 Adjust picture tilt via I2C BUS for correct top/bottom lines.
6.4.6 Adjust the top and bottom corner by I2C to straight vertical lines BIAS R G B : R(red) G(green) B(blue) cutoff
of the left and right edge. GAIN R G B : R(red) G(green) B(blue) gain
6.4.7 Adjust the parallelogram by I2 CBUS to get optimum vertical V FOCUS : Vertical Focus
line. VLIN BAL : Vertical Linearity Balance
6.4.8 Adjust the unbalance pin by I2C BUS to get optimum vertical USER : Horizontal size range
line. RASTER H: Horizontal DC (raster) Shift
6.4.9 Adjust the unbalance Vertical linearity balance by I2C BUS to RASTER V: Vertical DC (raster) Shift
get optimum vertical linearity balance. HLIN : Horizontal Linearity
6.4.10Adjust the unbalance Vertical linearity by I2C to get optimum V LIN : Vertical Linearity
vertical linearity. SUB : Zoom range
6.5 Adjust size/centering/trapezium/pincushion/parallelogram SUB : Sub Contrast
of all other preset modes via I2C bus. V OFFSET : Vertical offset
V GAIN : Vertical Gain
7. Alignment of Vg2 cut-off point, white tracking ABL : Auto Beam Limit
T CORNER: Corner Correctionof TOP
Equipment : 1. Video Test Generator-801GC (Quantum Data) B CORNER: Corner Correctionof BOTTOM
2. Color-analyzer (Minolta CA-100) CONVERGENCE(V H):CONVERGENCE Correction of Vertical,
VG2 [(screen), at the bottom of the L.O.T.]. Horizontal.
* Apply a video signal in the 1024 x 768 with 68.7 kHz/85 Hz mode, VE(HILI SHARP): Video Enhance of HIghLIght,SHARPness
select the "full white pattern" (sizes 306 x 230 mm). (VE Adjustment Range from 1(10%) to 4(40%))
* Use color-analyzer (Minolta CA-100) to adjust cutoff and (VE Is also LightFrame)
white uniformity. 7.2 Connect the video input, set brightness control at center, and
Brightness = 50%, Sub-Contrast = 190%, ABL = 128% (I2 C) contrast control at maximum
OSD R/G/B cut-off and R/G/B gain can be accessed, with 7.3 set 9300