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PDF 20PL84 Data sheet ( Hoja de datos )

Número de pieza 20PL84
Descripción COLOR TELEVISION SERVICE MANUAL
Fabricantes Sharp 
Logotipo Sharp Logotipo



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No Preview Available ! 20PL84 Hoja de datos, Descripción, Manual

20PL84
SERVICE MANUAL
COLOR TELEVISION
Chassis No. GA-1
MODELS 20PL84
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 INSTRUCTIONhSttp://www.DataShee.t4U.ne.t/ .............................................................................. 5
» CHASSIS LAYOUT ............................................................................................................................. 13
» BLOCK DIAGRAM .............................................................................................................................. 14
» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS........................................................ 16
» SCHEMATIC DIAGRAMS ...................................................................................................................17
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 2 1
» REPLACEMENT PARTS LIST ............................................................................................................ 25
» PACKING OF THE SET ...................................................................................................................... 31
ELECTRICAL SPECIFICATIONS
POWER INPUT ........................................ 110-220 V AC 50/60 Hz
POWER RATING.................................................................... 72 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 change without
prior notice.
SHARP COR1 PORATION
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20PL84 pdf
20PL84
Note:
INSTALLATION AND SERVICE INSTRUCTIONS
(1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 minutes.
CIRCUIT PROTECTION
The receiver is protected by a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
+B DC REGULATOR CONFIRMATION
The + B DC output voltage adjustment is not included
in this circuit.However, should confirmation be
reguired proceed as follows.
1. Actuate receiver with 220V AC input voltage.
2. Receive a local channel.
3. Connect positive lead of digital voltmeter 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 normal function and circuitry
reliability.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
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 voltage should be approximately, 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 protection circuit to ascertain
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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 external 27.9V DC at TP653 by 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 and TP652. Now make
sure that normal picture appears on the screen.
7. If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
5
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20PL84 arduino
20PL84
Ë SERVICE ADJUSTMENT
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode signal category and select
the service adjustment "AGC".
3. Set the data value to point where no noise or beat
appears.
4. Select another channel to confirm 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 service 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
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No. Adjusting point
Adjusting procedure/conditions
Waveform and others
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.
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
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