Adjustment Instructions; Application Range - LG KE/KL-20/21P32X Service Manual

1. APPLICATION RANGE

This specification is applicable to tvcr's (MV-031Achassis)
manufactured in the tv factory or the approved site.
1.1 MAIN PRUDUCTION FORM
-. SET ( O )
-. SKD ( O )
-. CKD ( 0 )
2. DESIGNATION
2.1. Hot GND & Cold GND must be connected separately to
prevent electric shock and to protect equipments because
this chassis is an insulation chassis.
2.2. The adjustment must be done by the exact sequence.
But, it can be changeable within the allowable margin of
error.
2.3. Adjust surrounding condition: unless otherwise noted,
adjust to the following condition.
Surrouding Temperature:
Reality Humidity : 60 % ! 20 %
Embedded Component Body Temperature In PCB: 25cC! 5 cC
2.4. The AC line voltage of TV must be maintained at 110-230V
@50/60 Hz.(NEU AC 110V-240V)
2.5. Before any adjustment, TV set must have warming time for
15 minutes.
2.6. Necessary instrument
- Multimeter (ADJUSTMENT/ASSEMBLY Line)
Max Input Current : over 1A / Max Input Voltage : 500Vdc
Measurement Range : 10Vdc ~ 100Vdc / Accuracy : 0.03%
- Oscilloscope : (ADJUSTMENT/ASSEMBLY Line)
Frequency Band: over 20MH
Input Capacitance : below 30pF / Max Input Voltage : 250V
- 10:1 PROBE
2.7. SIGNAL
Unless otherwise noted,input the STANDARD COLOR SIGNAL
60~80 dBu.
The standard color signal is LG's standard digital signal.
It refers the standard color signal to LG standard signal.
If LG standard signal is a criterion,PAL standard signal is PAL-
B/G 05 CH and SECAM standard signal is SECAM 04CH or
40CH.
LG standard color signal has priority to others and other
vendors which use different equipment from LG can use the
PHILIPS DIGITAL PATTERN or COLOR BAR PATTERN or
CIRCLE PATTERN depend on itmes.

ADJUSTMENT INSTRUCTIONS

25cC! 5 cC
/Input Impedance: over 1MX
Z
3. DECK LINE ADJ.(VCR DECK/CIRCUIT ADJ.)
AZIMUTH ADJUST SCEW AZIMUTH ADJUST SCEW AZIMUTH ADJUST SCEW
P2 P2 P2
DRUM DRUM DRUM
FE HEAD FE HEAD FE HEAD
P1 P1 P1
TENTION ARM TENTION ARM TENTION ARM
P0 P0 P0
SUPPLY SUPPLY SUPPLY
REEL REEL REEL
ADJUST PART LOCATION ADJUST PART LOCATION
3.1. P2/P3 TEMPORARY ADJUSTMENT
3.1.1. NECESSARY INSTRUMENT
1. PAL SP Normal TAPE
2. OSCILLOSCOPE
3. 10:1 PROBE : 2 PIECES
4. SPECIAL NUT DRIVER (P2/P3 for Adjustment)
3.1.2. ADJUSTMENT
1. Play the PAL SP NORMAL TAPE.
2. Connect the oscilloscope(CH-1) to J123(H/SW) of main
PCB.
3. Connect the oscilloscope(CH-2) to J158(RF) of main PCB.
4. With observing the RF envelope waveform, adjust P2, P3
until it becomes the waveform C.
5. Check the envelope waveform is in the maximum size by
pressing the TRK UP(+), down(-) button.
3.2. CTL/AUDIO LEVEL ADJUSTMENT
P2 P2 P2
<A> P2 POST ADJUSTMENT <A> P2 POST ADJUSTMENT
P3 P3 P3
<B> P3 POST ADJUSTMENT <B> P3 POST ADJUSTMENT
FIGURE 2> P2/P3 ADJUSTMENT WAVEFORM
3.2.1. NECESSARY INSTRUMENT
1. CTL TAPE
2. PAL SP Normal TAPE(AUDIO LEVEL for Adjustment)
3. OSCILLOSCOPE
4. 10:1 PROBE : 2 PIECES
5. RMS METER(AUDIO LEVEL for Adjustment)
3.2.2. CTL ADJUSTMENT
THIS ADJUSTMENT MUST BE DONE WHEN THE
UNCONTROLLED DECK IS WAREHOUSED.
1. Connect the oscilloscope to J101(CTL).
2. After playing the CTL control tape, make sure the CTL
waveform range is from 1.5 :1 to 2.5 : 1. If it is out of range ,
X- DISTANT FIX SCREW X- DISTANT FIX SCREW X- DISTANT FIX SCREW
X- DISTANT ADJUST GROOVE X- DISTANT ADJUST GROOVE X- DISTANT ADJUST GROOVE
P3 P3 P3
HEIGHT ADJUST SCREW HEIGHT ADJUST SCREW HEIGHT ADJUST SCREW
TILT ADJUST SCREW TILT ADJUST SCREW TILT ADJUST SCREW
PINCH - ROLLER PINCH - ROLLER PINCH - ROLLER
P4 P4 P4
T/UP ARM T/UP ARM T/UP ARM
CAPSTAN CAPSTAN CAPSTAN
TAKE - UP TAKE - UP TAKE - UP
REEL REEL REEL
D D
<C> FINAL ADJUSTMENT WAVWFORM <C> FINAL ADJUSTMENT WAVWFORM
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