LG KF-20P31 Service Manual page 20

4.2.2. Let the picture be the most clear by the criterion of the
vertical line of it, varying the focus V/R of FBT.
4.3. PURITY AND CONVERGENCE ADJUSTMENT
: Warm up the TV set at least 15 minutes before adjustment.
4.3.1. PURITY ADJUSTMENT
1. After degaussing the CPT with using the degaussing coil, set
the picture at Standard ON.
2. Receive the raster signal or E50CH(red pattern) from a
pattern generator.
3. Move the DY toward CPT PANEL to put the picture like the
figure 5.
4. Turn the purity magnet(the second pole magnet) to let red
color located at the center of picture. At the same time let
color-line located at the center vertically.
5. After finishing the second pole magnet adjustment, fix it
temporarily by the lock ring.
6. Let the picture became uniform red color by moving the DY
R
< figure 5 >
PICTURE STANDARD ON
CONTRAST
BRIGHTNESS : 70%
COLOUR
slowly backward and then tighten the fixing screw. (Check
the slope)
4.4. SCREEN ELECTRIC VOLTAGE
1. ONPUT PAL DIGITAL PATTERN(EU05 CH)
2. SELECT CHANNEL 0
3. CONNECT THE PROBE OF OSCILLOSCOPE TO THE RK
OF CPT PCB
4. SET the oscilloscope TO 50V/DIV, 20us/DIV(using 10:1
Prpbe ) and after putting the GND ling upon the lowest grid
V V
140V 140V
GND GND
line of the scope by pushing the GND button, enter into DC
mode.
No Adjust Voltage
1
140V ± 3V
2
130V ± 3V
* Adjust screen volume of FBT so that the waveform is the same
as below figure.
G B
: 85%
: 50%
BLACK LEVEL(DC) BLACK LEVEL(DC)
Remark Note
4.5 WHITE BALANCE
4.5.1 NECESSARY INSTRUMENT
: WHITE BALANCE METER
4.5.2 ADJUST PREPARATION
1. Adjust it after warming up the meter over 15 minutes.
2. Input the picture with the white signal and black signal at
upper and lower side each in a standard of the CPT°Øs
horizontal center.
3. Set this picture in the status of standard ON.
4.5.3 ADJUSTMENT
: Push the SVC key of a transmitter which is possible to control
Model(14/20/21) X
EU 288
NON-EU
281
Model(15 FLAT ) X
EU
288
NON-EU
272
the SVC and adjust the RG and BG varying the VOL +/-, in the
status of the initial data 32 of the CG in SVC MENU on the
screen. (This chassis adjusts only the high light.)
4.6. DEFLECTION DATA ADJUSTMENT
4.6.1. INPUT PAL DIGITAL PATTERN(EU05CH)
4.6.2. PRESS SVC KEY ON THE SERVICE REMOTE
CONTROLLER AND SELECT LINE SERVICE2 MODE
ADJUSTABLE ITEM IS SELECTED BY CH+/- KEY,
STATUS Adjust Cintents
V-SLP Vertical Slope
V-AMP Vertical Amplitude
V-SFT Vertical Shift
H-SFT Horizontal Shift
S-COL Vertical S-correction
VARIABLE ITEM IS SELECTED BY VOL +/- KEY.
4.6.3. DEFLECTION EARLY ESTABLISHMENT DATA
4.6.4.VERTICAL SLOPE, V-SLP ADJUSTMENT
: Select V-SLP mode and adjust until horizontal center line of
the large circle coincides with blanking line
4.6.5. VERTICAL AMPLITUDE, V-AMP ADJUSTMENT
: Select V-AMP mode , and adjust until the upper and lower
end of the large circle reach 5ᒠinside from the effective
area of CPT.
4.6.6. VERTIVAL SHIFT, V-SFT ADJUSTMENT
: Select V-SFT mode and adjust until the horizontal center
coincides with the vertical sign Slot mark of CPT.
4.6.7. HORIZONTAL SHIFT, H-SFT ADJUSTMENT
: Select H-SFT mode and adjust until the vertical center
coincides with horizontal sign slot mark of CPT.
4.6.8. VERTICAL S-CORRECTION, S-COL ADJUSTMENT
: Select S-COL mode and adjust until the grid of cross hatch
Y Color Temperature
295 9000K
10000K
288
Y Color Temperature
9000K
295
12000K
288
Y Y Y
25 25 25
31 31 31
32 32 32
32 32 32
15 15 15
Y
25
31
32
32
15
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