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Electrical Instructions
109B6 CRT
27
1. General point
1.1 During alignment and measurement supply a distortion free AC-
mains voltage to the apparatus via an isolating transformer with
a low internal resistance.
1.2 All voltages have to be measured or applied with respect to ground,
unless otherwise stated. Note: Do not use heat-sink as ground.
1.3 The term Linear RGB is meant the 0.7Vpp video with separate
sync. (TTL level).The pre-set timing formats from pattern generator
CHROMA- 2250 are shown in
GENERAL PRODUCT SPECIFICATION
1.4 Any external voltage source should have low internal impedance.
1.5 The alignment has to be done in room temperature 25+/-5 .
1.6 Digital control buttons for
OSD MENU :
Main Controls
- Language .Chinese
.English ---------- default item.
Espanol
Francais
Deutsch
Italiano
Portuguese
Korean
- Zoom Zoom
- Adjust Horizontal Position
.Size
- Adjust Vertical .Position
.Size
- Adjust Shape Adjust side curve Pincushion
.Balanced
.Adjust side angles Trapezoid
Parallelogram
Rotate image .Rotate
- Adjust Color .9300K for general use
6500K for image management
5500K for photo-retouch
.SRGB
.User Preset R, G, B
- Reset to factory settings .No
.yes
- Extra controls .Adjust Moire .Horizontal
.Vertical
.Degauss
.Light-frame
.Serial No.
.Resolution
.Frequency
""
C
- Model select (under factory mode)
CPT CRT: set 109B6 CPT ON
LPD & SDI CRT: set 109B6 LG & SDI ON
.SWDDC set ON
.LF ONOSD set ON
.LF3 set ON
- Close main controls
2. Pre warm -up
2.1 Align in pre-warmed condition at least 30 minutes during
manufacturing.
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3. Main chassis alignment
3.1 Power supply adjustment
3.1.1 Set Vg2 manually (screen) to fully counterclockwise
(zero beam current).
3.1.2 Apply 80KHz/75Hz full black pattern.
3.1.3 Monitor the following auxiliary voltages.
+197.0V SOURCE ACROSS C2152 and gnd. +196.0V ± 3.0 VDC
+82.5V SOURCE ACROSS C2151 + 82.5V ± 1.5 VDC
+6.2V SOURCE ACROSS C2155 + 6.2V ± 0.2 VDC
+12.2V SOURCE ACROSS C2153 + 12.2V ± 0.7 VDC
-12.2V SOURCE ACROSS C2154 - 12.2V ± 0.7 VDC
3.2 H-Deflection supply voltage adjustment
3.2.1 Apply 80KHz /75Hz 1280x1024 full black pattern.
3.2.2 Adjust manually R3561 to obtain :
146V +/- 0.3V for LPD , CPT & SDI CRT
across C2600 at zero beam current
.
3.3 Picture geometry and EHT regulation adjustment
3.3.1 EHT regulation adjustment
At 1280x1024 80KHz/75Hz mode full black pattern
use DC voltage meter to measure socket 1681 Pin 1. Adjust VR 3699
to get 4.75V +/- 0.05V at socket 1681 pin 1.
4. General conditions for alignment
4.1 During all alignments, supply a distortion free AC mains voltage
to set via an isolating transformer with low internal impedance.
4.2 All measurements are carried out at nominal mains voltage,
unless otherwise stated.
4.3 Align in pre-warmed condition, at least 30 minutes warm-up with
nominal light output.
4.4 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+/-50Mg, Z=0.
4.5 All voltages are to be measured or applied with respect to ground,
unless otherwise stated. Attention: Do not use heat-sink as ground.
4.6 Any external voltage sources should have a low internal impedance.
4.7Adjust function controls to center position unless otherwise stated.
4.8 The white balance and purity has to be adjusted in dully lighted
room.
4.9 All alignments have to be done in a room with a temperature
of 25+/- 10 °C.
5. Alignment of Vg2 cut-off point, white tracking
5.1 Please pre-store EPROM datas as below Form 1. before PCB
assembly .
Form 1 : EEROM preset data list of CRT deviation
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