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PDF 20PL83 Data sheet ( Hoja de datos )
| Número de pieza | 20PL83 | |
| Descripción | COLOR TELEVISION SERVICE MANUAL | |
| Fabricantes | Sharp | |
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Hay una vista previa y un enlace de descarga de 20PL83 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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20PL83
SERVICE MANUAL
S49F614LK20A/
P
COLOR TELEVISION
Chassis No. MSA
MODELS 20PL83
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.
CONTENTS
Page
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» LOCATION OF USER'S CONTROL ..................................................................................................... 4
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 5
» CHASSIS LAYOUT ............................................................................................................................. 13
» BLOCK DIAGRAM .............................................................................................................................. 14
» SCHEMATIC DIAGRAMS ...................................................................................................................18
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 2 3
» REPLACEMENT PARTS LIST ............................................................................................................ 27
» PACKING OF THE SET ...................................................................................................................... 33
ELECTRICAL SPECIFICATIONS
POWER INPUT ........................................ 110-220 V AC 50/60 Hz
POWER RATING .................................................................7..2 W
PICTURE SIZE .......................................... 1,194 cm2 (185sq inch)
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................................... QPF Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency .................................... 42.17 MHz
(Nominal)
AUDIO POWER
OUTPUT RATING....................... 3.0 + 3.0 W (at 10% distortion)
SPEAKER
SIZE ................................................................ 9 × 5 cm (Round)
VOICE COIL IMPEDANCE ........................... 32 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ..................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels ........................................................... 1 thru 125
Specifications are subject to c hange without
prior notice.
SHARP COR1 PORATION
http://www.Datasheet4U.com
1 page  
20PL83
Note:
INSTALLATION AND SERVICE INSTRUCTIONS
(1) When performing any adjustments to resistor contr ols and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 min utes.
CIRCUIT PROTECTION
The receiver is pr otected b y a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the A C
line input.
+B DC REGULATOR CONFIRMATION
The + B DC output voltage adjustment is not included
in this cir cuit.However, should confirmation be
reguired proceed as follows.
1. Actuate receiver with 220V AC input voltage.
2. Receive a local channel.
3. Connect positiv e lead of digital v oltmeter to C754
positive side on PWB-A ; negative lead to chassis
ground.
4. Confirm this voltage reading is as below.
CAUTION: The reading should be within +130.0 ± 2.0V
DC to ensure nor mal function and circuitr y
reliability.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within saf e
and efficient design limitations as specified checks
should be as follows:
1. Connect an accur ate high v oltage meter betw een
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 110~220V
AC line voltage, with a strong air signal or a properly
tuned in test signal.
3. Receve a good local channel.
4. The v oltage should be appro ximately, 25.5kV (at
pictuer MAX Bright center condition).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation pr otection circuit to ascer tain
proper operation as follows:
1. Apply 220V AC using a variac transformer for accurate
input voltage.
2. Allow for warm up and adjust all customer controls
for normal picture and sound.
3. Receive a good local channel.
4. Connect a digital voltmeter to TP653 and make sure
that the voltmeter reads 21.4 ± 1.5 V.
5. Apply e xternal 27.9V DC at TP653 b y using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and make
a short circuit between TP651 andTP652. Now make
sure that normal picture appears on the screen.
7. If the operation of the hor izontal oscillator does not
stop in step 5, the circuit must be repaired beofre the
set is returned to the customer.
5
5 Page 
20PL83
Ë SERVICE ADJUSTMENT
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the ser vice mode signal categor y and select
the service adjustment "AGC".
3. Set the data v alue to point where no noise or beat
appears.
4. Select another channel to confir m that no noise or
beat appears.
CHROMA ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1 SUB-TINT (I2C 1. Receive the "Colour Bar" signal through AV in.
BUS CON-
2. Connect the oscilloscope to TP853 (Pin (5) of
TROL)
P882) BLUE-OUT.
» Range
: 100mV/div. (AC)(Use Probe 10:1)
» Sweep time : 10 µsec/div.
3. Call the "SUB-TINT" mode in ser vice mode. Ad-
just the "SUB-TINT" bus data to obtain the wave-
form shown as Fig 1.
4. "SUB-TINT" bus data decrease 4 steps to get fi-
nal waveform. (Fig 2.)
5. Clear the SERVICE mode.
Waveform and others
WAVEFORM 1
FINAL WAVEFORM
SAME LEVEL
W Y CY G MG R B
Fig 1
Fig 2
HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1 V-SLOPE(I2C
BUS CON-
TROL)
1. Receive Monoscope Pattern Signal.
2. Call the "V-LIN" mode.
3. Increase or decrease "V -LIN" by Volume key till
the horizontal line in the center of monoscope is
just at the position where the blanking starts.
Waveform and others
2 V-CENTER (I2C 1. Call the "V-CENT" mode.
BUS CON-
2. Increase or decrease "V-CENT" by Volume key till
TROL)
the picture is centered.
3 V - AMP (I2C
BUS CON-
TROL)
1. Call the "V-AMP" mode.
2. Increase or decrease "V - AMP" by Volume key to
set overscan of 10.0% typical.
Adjustment Spec 10.0% range ±1%.
4 S-CORREC-
TION (I2C BUS FIXED DATA, NO NEED TO ADJUST.
CONTROL)
H - CENTER
5 1. Call the "H-CENT" mode.
2. Increase or decrease "H-CENT" by Volume key
to center the picture horizontal.
6 Focus
adjustment
1. Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
3. Adjust the focus control to get the best focus.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet 20PL83.PDF ] | |
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