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16 109B2 GS3 CM25 Electrical Instructions
Go to cover page

0. General - Connect a "high-voltage voltmeter" between the high-
voltage connection of the picture tube and earth.
When carry-out the electrical settings in many cases a video - Turn on the power.
signal must be applied to the monitor. A computer with : - Set the EHT trimming potentiometer R3587 so that the
"high- voltage voltmeter" reads 26.5 KV +/- 0.5 KV .
- ATI GPT-1600 (4822 397 10065), Mach 64 (up to 107kHz)
- Turn off the power.
are used as the video signal source. The signal patterns - Remove the "high-voltage voltmeter" from the picture tube.
are selected from the "service test software" package, see - Turn on the power again.
user guide 4822 727 21046 (GPT-1600).
3. Monitor the following auxiliary voltages.
0.1 This monitor has 35 factory-preset modes as below:
SOURCE ACROSS C2152 + 190.0V +/- 1.0VDC.
640 x 350 37.9 kHz/85 Hz 1152 x 870 68.7 kHz/75 Hz SOURCE ACROSS C2154 + 79.0V +/- 1.0VDC.
640 x 400 31.5 kHz/70 Hz 1152 x 900 71.8 kHz/76 Hz SOURCE ACROSS C2156 - 6.3V +/- 0.3VDC.
640 x 480 31.5 kHz/60 Hz 1280 x 960 60.0 kHz/60 Hz SOURCE ACROSS C2160 + 13.5V +/- 0.5VDC.
640 x 480 37.9 kHz/72 Hz 1280 x 960 85.9 kHz/85 Hz
SOURCE ACROSS C2157 - 13.5V +/- 0.5VDC.
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 4. General conditions for alignment
720 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 4.1 During all alignments, supply a distortion free AC mains
800 x 600 37.9 kHz/60 Hz 1600 x 1200 87.5 kHz/70 Hz voltage to set via an isolating transformer with low internal
800 x 600 48.1 kHz/72 Hz 1600 x 1200 93.8 kHz/75 Hz impedance.
800 x 600 46.9 kHz/75 Hz 1792 x 1344 83.6 kHz/60 Hz 4.2 Align in pre-warmed condition, at least 30 minutes warm-
800 x 600 53.7 kHz/85 Hz 1856 x 1392 86.3 kHz/60 Hz
up with nominal picture brightness.
800 x 600 63.9 kHz/100 Hz 1920 x 1440 90.0 kHz/60 Hz
4.3 Purity, geometry and subsequent alignments should be
832 x 624 49.7 kHz/75 Hz
1024 x 768 48.4 kHz/60 Hz carried out in magnetic cage with correct magnetic field.
1024 x 768 56.5 kHz/70 Hz
1024 x 768 60.0 kHz/75 Hz Northern hemisphere : H=0, V=430+/-50 mG, Z=0
1024 x 768 68.7 kHz/85 Hz Southern hemisphere : H=0, V=-520+/-50 mG, Z=0
1152 x 864 67.5 kHz/75 Hz
1152 x 864 77.1 kHz/85 Hz 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.
If not using the ATI card during repair or alignment, The 4.5 Adjust function controls " " to center position except
service engineer also can use this service test software for contrast control which should be set to MAX.
adapting with normal standard VGA adaptor and using
standard VGA mode 640 x 480, 31.5 kHz/60 Hz (only) as 5. To access factory mode:
signal source.
0.3 AC/DC Measurement: - Turn off monitor (don't turn off PC)
The measurements for AC waveform and DC figure is based - Press " " and " " simultaneously on the front
on 640 x 480 31.5 kHz/60 Hz resolution mode with test control panel, then press " ",wait till the OSD menu
pattern "gray scale". with characters " factory mode (below OSD menu)" come
Power input: 110V AC on the screen of monitor.
1. B+ supply voltage (3165) 79Vdc
- Apply a video signal in the 1024 x 768 with 68.7 kHz/85Hz
mode. 00115

- 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 109B2 V1.52 20000619

ground (common ground). - If OSD menu disappears on the screen of monitor, press
- Set the B+ trimming potentiometer 3165 so that the reading " " again (anytime), then the OSD menu comes on the
on the dc voltmeter is 190.0 V +/- 0.5 Vdc. screen again.
2. High-voltage EHT (3587) - using " " : to select OSD menu.
- Apply a video signal in the 1024 x 768 with 68.7 kHz/85Hz
: to increase or decrease the setting.
mode.
- Select the "cross-hatch" pattern. - Using " " to confirm the selection.
- Set the brightness control and the contrast control to the
minimum position.

Back Forward
Electrical Instructions (Continued) 109B2 GS3 CM25 17
Go to cover page
6 To leave factory mode
9300 BIAS R G B GAIN R G B 9300 BIAS R G B GAIN R G B
6500 BIAS R G B GAIN R G B 6500 BIAS R G B GAIN R G B
* After alignment of factory mode, turn off monitor (if you do 5500 BIAS R G B GAIN R G B 5500 BIAS R G B GAIN R G B
not turn off monitor, the OSD menu is always at the factory FOCUS(H V) VLINBAL USER FOCUS(H V) VLINBAL USER
mode), then turn on monitor again (at this moment, the .
RASTER(H V) LIN ( H V ) SUB RASTER(H V) LIN ( H V ) SUB
OSD menu goes back to user mode). V(OFFSET GAIN) SUB V(OFFSET GAIN) SUB
CORNER(T B) ABL CORNER(T B) ABL
LF(BRIGH SHARP) LF(BRIGH SHARP)
EXIT EXIT
TIMER Set OSD display time. 135 135
Fig. 2.2 Fig. 2.3

7. Alignment of Vg2 cut-off point, white tracking (OSD
control) BIAS R G B : R(red) G(green) B(blue) cutoff
GAIN R G B : R(red) G(green) B(blue) gain
Equipment : 1. Video Test Generator-801GC (Quantum V FOCUS : Vertical Focus
H FOCUS : Horizontal Focus
Data)
VLIN BAL : Vertical Linearity Balance
2. Color-analyzer (Minolta CA-100) USER : Horizontal size range
RASTER H: Horizontal raster Shift
VG2 [(screen), at the bottom of the L.O.T.]. RASTER V: Vertical raster Shift
* Apply a video signal in the 1024 x 768 with 68.7 kHz/85 Hz HLIN : Horizontal Linearity
mode, V LIN : Vertical Linearity
select the "full white pattern" (sizes 355 x 265 mm). SUB : Zoom Control range
* Use color-analyzer (Minolta CA-100) to adjust cutoff and
2 SUB : Sub Contrast
V OFFSET : Vertical offset
white uniformity.
V GAIN : Vertical Gain
ABL : Auto Beam Limit
OSD R/G/B cut-off and R/G/B gain can be accessed, with T CORNER: Corner Correctionof TOP
initial data: B CORNER: Corner Correctionof BOTTOM
LF : LightFrame
9300