8104S CM23 GSIII
Electrical Instructions
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0. General:2. EHT voltage (3540)
When carrying out the electrical setting, in many cases a video- Connect a dc voltmeter between capacitor 2643 joint and ground.
signal must be applied to the monitor. A computer with :- Apply a video signal in the 640 x 480 with 31.5 kHz/60 Hz mode.
- Select the "crosshatch" pattern. Adjust trimming pot-meter 3540
- "ATI VGA1024" interface carduntil the DC voltmeter reads : 67.5 +/- 0.2V (for PHILIPS CRT),
- PGA1024 (4822 212 30916)But 68 V for CPT CRT
- PGA1280 (4822 212 30917)
3. Monitor the following auxiliary voltages
are used as the video signal source. The signal pattern are selected
from the "service test software" package. see user guide 4822 727+12V source across C2158 +12.7V +/- 0.5 VDC
19896 (ATI 1024), or 4822 727 20273 (PGA 1280).- 12V source across C2162 - 12.7V +/- 0.5 VDC
+8V source across C2172+8.0V +/- 0.4 VDC
+6V source across C2164+6.2V +/- 0.3 VDC
0.1 Factory preset timing mode-178V source across C2647-178V +/- 8.0 VDC
+180V source across C2153+183V +/- 1.5 VDC
+5V source across C2168+5.0V +/- 0.25VDC
Resolution H.freq./V.freq.H.V.+80V source across C2156 +81.0 V +/- 0.5 VDC
640 x 400 31.5 kHz/70 Hz-+
640 x 480 31.5 kHz/60 Hz--4. General conditions for alignment
640 x 480 37.5 kHz/75 Hz--
800 x 600 46.9 kHz/75 Hz++4.1 During all alignments, supply a distortion free AC mains voltage
800 x 600 53.7 kHz/85 Hz++to set via an isolating transformer with low internal impedance.
1024 x 768 48.3 kHz/60 Hz--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.
0.2 With normal VGA card:Northern hemisphere : H=0, V=450 mG, Z=0
Southern hemisphere : H=0, V=-500 mG, Z=0
If not using the ATI card during repair or alignment, The serviceEquatorial Support: H=0, V=0mG, Z=0
engineer also can use this service test software adapting with normal
standard VGA adaptor and using standard VGA mode4.4 All voltages are to be measured or applied with respect to
640 x 480, 31.5kHz/60Hz (only) as signal source.ground.
Note: Do not use heatsink as ground.
4.5 Adjust brightness controls to center position except for contrast
0.3 AC/DC measurement:control which should be set to MAX.
The measurements for AC waveform and DC figure is based on 640 x5. To access Factory Mode:
480 31.5 kHz / 60 Hz resolution mode with test pattern gray scale.
1. When "shift" LED is off, control is at 1st level, and when LED is on,
control is at 2nd level.
1. B+ Supply voltage (3178), 81 VDC
2. "Shift" LED will flash 0.1 second at the time when function keys (e.g.
H-Shift, H-Size,...,etc.) are pressed, and it should flash continuously
when adjusting "+" or "-" is at end of range. Releasing "+" or "-" key,
- Set the brightness front control and the contrast front control to
all adjusted values will be stored automatically after 10 seconds.(at
minimum.
user Mode).
- Set the trimming pot-meters 3178/3540 in the mechanical mid-
position (this is a pre-setting).
3. Factory preset mode entry, in power on status pressed "H-shift" and
- Connect a DC voltmeter between capacitor 2156 joint and ground.
"V-size"simultaneously at 1st level. After 2 seconds the shift led will
- Switch on the monitor.
flash 3 times then the u-controller will entry factory mode.
- Apply a video signal in the 640 x 480 with 31.5 kHz/60 Hz mode.
( turn off power and then on to return to user mode)
- Select the "crosshatch" pattern.
- Adjust trimming pot-meter 3178 until the DC voltmeter reads 81 V
4. "Power down overrule" is only functional in power saving status and
+/- 0.2V.will be reset by switching off power.
5. At factory adjust mode, Press Shift key( shift LED on) then press V-
size, the modified data will be stored in factory preset area on
EEPROM and shift LED will flash two times.
6. At service, please entry Factory mode (pressing H-Shift and V-size
simultaneously) first before using service factory alignment tools or
auto-alignment to perform factory alignment.
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