File name p21_p23.pdf
Electrical Adjustments 107P CM25 GSIII 21
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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
4. General conditions for alignment
0.1 This monitor has 8 factory-preset modes as below. 4.1 During all alignments, supply a distortion free AC mains voltage
800 x 600 46.9 kHz/75 Hz to set via an isolating transformer with low internal impedance.
800 x 600 53.7 kHz/85 Hz 4.2 Align in pre-warmed condition, at least 30 minutes warm-up with
1024 x 768 60.0 kHz/75 Hz nominal picture brightness.
1024 x 768 68.7 khz/85 Hz 4.3 Purity, geometry and subsequent alignments should be carried
1280 x 960 85.0 kHz/85 Hz out in magnetic cage with correct magnetic field.
1280 x 1024 80.0 kHz/75 Hz
1280 x 1024 91.1 kHz/85 Hz Northern hemisphere : H=0, V=430 +/- 50 mG, Z=0
1600 x 1200 93.8 khz/75 hz Southern hemisphere : H=0, V=-520 +/-50 mG, Z=0
0.2 With normal VGA card:
4.4 All voltages are to be measured or applied with respect to ground.
If not using the ATI card during repair or alignment, The service Note: Do not use heatsink as ground.
engineer also can use this service test software adapting with normal 4.5 Adjust brightness controls to center position except for contrast
standard VGA adaptor and using standard VGA mode 1024 x 768, control which should be set to MAX.
68.7 kHz/85 Hz (only) as signal source.
0.3 AC/DC Measurement: 5. To access factory mode:
The measurements for AC wave