23
107P2 CM25 GSIII
Electrical Adjustments
0. General
1. B+ supply voltage (3165) 84Vdc
2. High-voltage EHT (3698)
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 9 factory-preset modes as below.
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 1024 x 768,
68.7 kHz/85 Hz (only) as signal source.
0.3 AC/DC Measurement:
The measurements for AC waveform and DC figure is based on 1024
x 768 68.7 kHz/85 Hz resolution mode with test pattern "gray scale".
Power input: 110V AC
- 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.
- 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
position.
- Connect a "high-voltage voltmeter" between the high-voltage
connection of the picture tube and earth.
- Turn on the power.
- Set the EHT trimming potentiometer 3698 so that the "high-
voltage voltmeter" reads 25.0 kV +/- 0.2 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.
5. To access factory mode:
5.1. To leave factory mode
SOURCE ACROSS C2152 and GND. +185.0V +/- 1.5 VDC
4.5 Adjust brightness controls to center position except for contrast
control which should be set to MAX.
- 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.
- 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.
- using "
" : to increase or decrease the setting.
(Please also refer to page 8 to page 15 for OSD adjustment)
- Using "
" to confirm the selection.
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).
SOURCE ACROSS C2154
+ 82.0V +/- 1.5 VDC.
SOURCE ACROSS C2156
- 6.4 V +/- 0.3 VDC.
SOURCE ACROSS C2160
+13.5V +/- 0.5 VDC.
SOURCE ACROSS C2157
- 14.0V +/- 0.5 VDC.
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 warm-up 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.
4. General conditions for alignment
Note: Do not use heatsink as ground.
00195
107PVE
V 1.44
000427
107PVE
V 1.44
000427
1.
640 x 350
31.5 Khz 70 HZ(VESA)
2.
640 x 400
31.5 Khz 70 HZ(VESA)
3.
640 x 480
43.2 Khz 85 HZ(VESA)
4.
800 x 600
46.9 Khz 75 HZ(VESA)
5.
800 x 600
53.7 Khz 85 HZ(VESA)
6.
1024 x 768
60.0 Khz 75 HZ(VESA)
7
1024 x 768
68.7 Khz 85 HZ(VESA)
8.
1280 x 1024
80.0 Khz 75 Hz (VESA)
9.
1280 x 1024
91.1 Khz 85 Hz (VESA)