Daewoo 432X, Service Manual

Page: 14 / 46

12
ALIGNMENT PROCEDURE
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Standard Adjustment Conditions
1. Power source voltage: 100-240Vac 50/60Hz
2. Aging: Take at least 20 minutes warm-up time.
3. Signals
Video:Analog 0.7Vpp 75
Ω
terminal positive polarity
Synchronizing:TTL level Negative/Positive Separate
Deflection frequency
Horizontal Frequency : 30KHz - 54KHz
Vertical Frequency : 50Hz - 120Hz
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Pre-Adjustment
1. B+ Adjustment
Adjust 165Vdc ± 0.5Vdc between P008 and ground at 31.5KHz mode, varying VR101.
Adjust 27.5Vdc ± 0.2Vdc between P009 and ground at 31.5KHz mode, varying VR501.
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Main Adjustment
1. Setting the Controls
Set the value of items as following.
Contrast:Max.(OSD value up to MAX)
Brightness:Center(Set the OSD value to center)
2. H.size, V.size, H.phase, V.position, Pincushion, Trapezoid
Receive the cross hatch pattern of Factory preset mode.
H.size, V.size, H.phase, V.position, Pincushion, Trapezoid are adjusted at each mode.
In Factory, Auto Alignment was done at each mode. Therefore, Factory preset mode has it’s
own value according to each control.
3. Focus
(a) Set brightness control to center and contrast control to MAX.
(b) Receive all “H” character pattern of 1024 X 768 (48KHz, 60Hz)
(c) Adjust the Focus control of FBT to obtain best Focus.
4. Geometric Distortion Adjustment.
(a) Receive the cross hatch pattern of factory preset mode.
(b) Pincushion, Trapezoid are adjusted the best geometric status.
5. White Balance Adjustment
(a) Select 9300 °K on the OSD Menu.
(b) Receive a full white pattern of 54KHz mode signal by using the signal generator.
(c) Set the brightness control to the maximum, the contrast control to the maximum.
(d) Cut off the FBT screen VR.
(e) Receive all the black patterns. The luminance of the screen should be 0.5~1.0 Ft-L by using Screen VR.
(f) Select the R-BIAS, G-BIAS and B-BIAS on the control menu and adjust the DATA +/– key to get the color
coordinates in x=0.281 ± 0.015, y=0.311± 0.015.
(g) Receive a full white pattern. Adjust the brightness value to the center.
(h) Select the R-GAIN and B-GAIN and adjust the DATA +/– key to get the color coordinates in x=0.281 ±
0.015, y=0.311 ± 0.015.
(i) Adjust the sub contrast control to get the screen luminance to 30 Ft/L (a full white pattern over 30 Ft/L)
(j) Check if the x, y coordinates of color analyzer is in x=0.281±0.015, y=0.311±0.015.
If the color coordinates is out of range, adjust the R. G. B BIAS & GAIN to get the coorinates in x=0.281,
y=0.311. Make sure that the coordinates is in range.
(k) Select 6550 °K on the OSD Menu and set the color coordinates in x=0.313, y=0.329 at the maximum
contrast control and center brightness control
(l) Check if a full white pattern is over 30Ft/L.