1. Application Object
These adjustment instructions are applied to CW62E chassis.
2. Notes
(1) Because this is a cold chassis, it is not necessary to use
an isolation transformer.But, operate it using a transformer
between the power supply line and chassis input to prevent
electric shock and to protect the test instrument.
(2) All adjustments must be done in correct sequence.
However, for the better productivity, it can be changed in
pre-permitted range.
(3) Environment conditions: If not specified, it must be done in
following conditions.
1) Temperature : 25°C ± 5°C
2)Humidity : 65% ± 10%
(4) Power supply of a SET which is adjusted is
(100~240V) ±10% AC, 50~60Hz
(5) If not specified, the receiver must be operated for more
than 20 minutes prior to the adjustment.
(6)Signal : Receive the standard color signal. (65dB ±1dB uV)
LG standard signal means the digital pattern
(PAL_EU 05CH)
3. Adjustment
3.1 Focus adjustment
3.1.1. Preperation
a. Receive the Cross-Hatch Pattern(Fig. 1) and Set the picture
condition on DYNAMIC Mode or APC CLEAR mode
3.1.2. Adjustment 1
Adjust the FOCUS VOLUME of FBT for the Best focus of
vertical line
3.2 Focus adjustment
Following direction is a case using of None-ITC CPT for CPT
manufacture factory.
This adjustment shoule be done as below direction.
3.2.1. Purity Adjustment
a. Do degauss CPT and Cabinet
b. Receive the RED Raster Pattern for purity adjustment.(11CH).
c. Unfasten fixing Screw of DY, close DY to CPT Funnel DY as
possible as you can.
d. Make R-Land be centered as cross Purity Magnet
That time,4
th
6
th
magnet should keep free gauss status
e. Make uniform RED Raster as moving DY,
Check there is purity problem or not on R/G/B, white Raster.
Then, Fix screw of DY.
(At this time, be careful about inclination and DY should be
fixed keeping horizontality)
f. Check the TV in direction of EAST, WEST, SOUTH, NORTH,.
Adjust with supporting MAGNET when adjustment is not
operated
.
3.2.2. Convergence Adjustment
This adjustment should be operated at the best condition of
FOCUS after finishing the PURITY adjustment.
a. BACK RASTER receives black CROSS HATCH signal.
b. Adjust Brightness so that there are 9-12 dots.
c. Widen two tabs of 4pole Magnet with equal angles and accord
red, blue vertical lines at the center of screen.
d. With keeping angle of "c. clause", rotate tab and accord
red/blue, green vertical lines at the center of screen
e. Widen two tabs of 6pole Magnet with equal angles and accord
red, blue vertical lines at the center of screen
f. With keeping angle of "e. clause", repeat the adjustment from c
to e keeping in mind the movement of red,blue, green when the
horizontal lines are twisted
- 5 -
ADJUSTMENT INSTRUCTIONS
<Fig. 1> Cross-Hatch Pattern (NTSC : US 09CH, PAL : E-7CH)
Assembling DY and
Magnet
CPT Assembly
As preparatory operations before
assembling CPT, wind cotton Tape for
protecting to CPT NECK and DY, CPT
connection parts. At this moment, end
of tape should be over-lapped and
wound in direct route to the NECK.
It needs minimum 15 minutes for
Heat run under Standard picture
condition.
Torque is 9~11 Kg f.cm when DY is
Fixed.
Fix the Magnet to the position as
shown picture below. Be careful not to
make CPT neck shadow while
adjusting DY.
HEAT RUN
Degaussing
Pre STC Adjust
Adjust Purity
Fix DY.
SCREEN Adjustment
Fix W/B
Adjust Focus
Adjust STC
Adjust DYC
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