21
107S2 CM23 GSIII
Electrical Adjustments
0. General
1. B+ supply voltage (3145) 83Vdc
2. High-voltage EHT (3561)
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 8 factory-preset modes as below.
720 x 400 31.5 kHz/70 Hz
640 x 480 31.5 kHz/60 Hz
640 x 480 43.0 kHz/85 Hz
800 x 600 46.9 kHz/75 Hz
800 x 600 53.6 kHz/85 Hz
1024x768 60.0 kHz/75 Hz
1280 x 1024 64.0kHz/60Hz
14
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
- 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 3145(+) and 3561(EHT)
in mid-position.
- Set Vg2 (screen) to fully Counter-clockwise (zero beamcurrent).
- Connect a dc voltmeter between the joint of capacitor 2151 and
ground (common ground).
- Set the B+ trimming potentiometer 3145 so that the reading on the
dc voltmeter is 83 V +/- 0.2 Vdc.
- 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.
- Turn off the power.
- Connect a dc voltmeter between the joint of capacitor c2601 and
ground (common ground).
- Turn on the power.
- Set the EHT trimming potentiometer 3561 so that the reading on
the dc voltmeter is 66.0V+/-0.2V(for PHL tube) or 67.0V+/- 0.2V
(for CPT tube)
1024 x 768 68.7 kHz/85 Hz
factory-preload modes as below
640 x 350 31.5 kHz/70 Hz 800 x 600 48.0 kHz/72 Hz
640 x 350 37.8 kHz/85 Hz 800 x 600 64.0 kHz/100 Hz
640 x 480 37.5 kHz/75 Hz 832 x 624 49.7 kHz/75 Hz
640 x 480 37.8 kHz/72 Hz 1024 x 768 48.3 kHz/60 Hz
640 x 480 50.5 kHz/100 Hz 1024 x 768 56.5 kHz/70 Hz
720 x 400 38.0 kHz/85 Hz 1152 x 864 67.5 kHz/75 Hz
800 x 600 37.90kHz/60Hz 1280 x 960 60.0 kHz/60 Hz
3.Monitor the following auxiliary voltages.
5. To access factory mode:
5.1. To leave factory mode
SOURCE ACROSS 7114 Pin and GRN +5 V +/- 0.25 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 C2155
-6.1 V +/- 0.3 VDC.
SOURCE ACROSS C2141
+8.0 V +/- 0.4 VDC.
SOURCE ACROSS C2153
+13.1V +/- 1.0 VDC.
SOURCE ACROSS C2154
- 13.1V +/- 1.0 VDC.
SOURCE ACROSS C2151
+83.0V +/- 1.0 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=450 mG, Z=0
Southern hemisphere : H=0, V=-500 mG, Z=0
Equatorial Support
: H=0, V=0
mG, Z=0
4.4 All voltages are to be measured or applied with respect to ground.
SOURCE ACROSS C2609
- 170 V +/- 15.0 VDC.
SOURCE ACROSS C2152(+ to Gnd) +180.0V +/-2.0 VDC.
4. General conditions for alignment
Note: Do not use heatsink as ground.
00195
G S 3 107S2LF
V2.00 20000614
G S 3 107S2LF
V2.00 20000614
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