LG KE-14P2B Service Manual page 3

Adjust Period
<Adjust Waveform>
* CAUTION: Set the trigger mode of Oscilloscope to DC.
3. Focus Voltage Adjustment
1) Receive the cross hatch pattern.
2) Press the PICTURE button to set the Standard ON
condition.
3) Adjust Focus control knob so that the focus of center &
circumference to be best.
4. Screen Adjustment
1) Receive PAL DIGITAL PATTERN.
2) Select channel 0.
3) Connect the probe of oscilloscope to the RK of CPT PCB.
4) Adjust screen volume of FBT so that the waveform is the
same as below figure.
V
140V
GND
H H o o w w t t o o g g e e t t i i n n t t o o S S V V C C m m o o d d e e w w h h e e n n y y o o u u d d o o n n ' ' t t h h a a v v e e S S V V C C
¡
R R e e m m o o t t e e C C o o n n t t r r o o l l l l e e r r . .
P P u u s s h h t t h h e e " " O O K K " " K K e e y y o o n n t t h h e e u u s s e e r r ' ' s s R R e e m m o o t t e e C C o o n n t t r r o o l l l l e e r r a a n n d d l l o o c c a a l l
" " O O K K " " b b u u t t t t o o n n a a t t t t h h e e s s a a m m e e t t i i m m e e . .
5. SIF Adjustment
1) Receive PAL DIGITAL PATTERN.
2) Connect the DMM to pin 5 of IC100 (SIF TP).
3) Adjust L107 to be DC 2.3¡ 0.05V.
6. RF AGC Adjustment
1) Input PAL DIGITAL PATTERN.
2) Connect DMM to AGC(J184) test point on the Main PCB.
3) Press SVC Key on the Service Remote Controller to get
into SVC mode and press PR +/- Key to select AGC.
4) Press VOL +/- Key until DMM reads the data on the table
below.
MODEL
Electric fields strength
65dBu ¡
AGC Voltage
3-6
Black Level (DC)
KL/KF/KE KI
0.2dBu 65dBu ¡ 0.2dBu
2.3 ¡ 0.1Vdc 2.1 ¡ 0.1Vdc
7. White Balance Adjustment
1) Input a signal which lower half is black and upper half is
white.
2) Set the picture at standard on.
3) Press SVC Key on the Service Remote Controller to get
into Service mode.
4) Press PR +/- Key to select BG, RG.
Press VOL +/- Key until X=281¡ 3, Y=288¡ 3.
¡ GG is fixed data at 32 so, do not adjust GG data.
8 Deflection Data Adjustment
1) Input PAL Digital Pattern.
2) Press SVC Key on the Service Remote Controller and
select LINE SERVICE 2 mode.
3) Press PR +/- Key to select an adjustment mode.
4) Press VOL +/- Key to adjust data.
5) Vertical SLOPE adjustment
¤ Select V-SLP mode with PR +/- Key.
¤Ł Press VOL +/- Key until the horizontal center line of
the large circle coincides with Blanking Line.
6) Vertical amplitude adjustment
¤ Select V-AMP mode with PR +/- Key.
¤ŁPress VOL +/- Key until the upper and lower end of the
large circle reach 5 mm inside from the effective area
of CPT.
7) Vertical Shift Adjustment
¤ Select V-SFT mode with PR +/- Key.
¤ŁPress VOL +/- Key until the horizontal center coincides
with the vertical sign slot mark of CPT.
8) Horizontal Shift Adjustment
¤ Select H-SFT mode with PR +/- Key.
¤Ł Press VOL +/- Key until the vertical center coincides
with the horizontal sign slot mark of CPT.
9) Vertical S-Correction Adjustment
¤ Select S-COL mode with PR +/- Key.
¤Ł Press VOL +/- Key until the grid of Cross Hatch
Pattern is even all over the screen.