3-5
ADJUSTMENT INSTRUCTIONS
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: 25
c
C
!
5
c
C
Reality Humidity : 60 %
!
20 %
Embedded Component Body Temperature In PCB: 25
c
C
!
5
c
C
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
Z
/Input Impedance: over 1M
X
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.
3. DECK LINE ADJ.(VCR DECK/CIRCUIT ADJ.)
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
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 ,
ADJUST PART LOCATION
TAKE
- UP
REEL
AZIMUTH ADJUST SCEW
X- DISTANT FIX SCREW
HEIGHT ADJUST SCREW
TILT ADJUST SCREW
CAPSTAN
T/UP ARM
X- DISTANT ADJUST GROOVE
PINCH
- ROLLER
SUPPLY
REEL
DRUM
P2
P3
FE HEAD
P1
TENTION ARM
P4
P0
ADJUST PART LOCATION
TAKE
- UP
REEL
AZIMUTH ADJUST SCEW
X- DISTANT FIX SCREW
HEIGHT ADJUST SCREW
TILT ADJUST SCREW
CAPSTAN
T/UP ARM
X- DISTANT ADJUST GROOVE
PINCH
- ROLLER
SUPPLY
REEL
DRUM
P2
P3
FE HEAD
P1
TENTION ARM
P4
P0
TAKE
- UP
REEL
AZIMUTH ADJUST SCEW
X- DISTANT FIX SCREW
HEIGHT ADJUST SCREW
TILT ADJUST SCREW
CAPSTAN
T/UP ARM
X- DISTANT ADJUST GROOVE
PINCH
- ROLLER
SUPPLY
REEL
DRUM
P2
P3
FE HEAD
P1
TENTION ARM
P4
P0
P2
<A> P2 POST ADJUSTMENT
P3
<B> P3 POST ADJUSTMENT
D
<C> FINAL ADJUSTMENT WAVWFORM
P2
P2
<A> P2 POST ADJUSTMENT
P3
P3
<B> P3 POST ADJUSTMENT
FIGURE 2> P2/P3 ADJUSTMENT WAVEFORM
D
<C> FINAL ADJUSTMENT WAVWFORM
Summary of Contents for KE-20P32X
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Page 28: ...3 16 PRINTED CIRCUIT BOARD MAIN ...
Page 30: ...3 18 POWER ...
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