SHARP 20LK60A, 20LK30A Service Manual

20LK30A/60A
SERVICE MANUAL
S49F420LK30A/
COLOR TELEVISION
Chassis No. SN-70A
20LK30A
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.
20LK60A
MODELS
20LK30A/60A
CONTENTS
Page
» ELECTRICAL SPECIFICATIONS......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................2
» INSTALLATION AND SERVICE INSTRUCTIONS ............................................................................... 5
» CHASSIS LAYOUT .............................................................................................................................11
» BLOCK DIAGRAM ............................................................................................................................. 13
» SCHEMATIC DIAGRAMS .................................................................................................................. 15
» PRINTED WIRING BOARD ASSEMBLIES........................................................................................22
» REPLACEMENT PARTS LIST ........................................................................................................... 25
» PACKING OF THE SET ..................................................................................................................... 31
ELECTRICAL SPECIFICATIONS
POWER INPUT .........................................110-220 V AC 50/60 Hz
POWER RATING
20LK30A .............................................................................88 W
20LK60A .............................................................................98 W
PICTURE SIZE ........................................... 1,194cm2 (185sq inch)
CONVERGENCE............................................................. Magnetic
SWEEP DEFLECTION .....................................................Magnetic
FOCUS ............................................... Hi-Bi-Potential 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
20LK30A ............................................ 1.3W (at 10% distortion)
20LK60A ............................................ 2.5W (at 10% distortion)
SHARP CORPORATION
SPEAKER
SIZE ........................................................................ 9 cm × 5 cm
VOICE COIL IMPEDANCE
20LK30A .......................................................8 ohm at 400 Hz
20LK60A .....................................................16 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.
1
20LK30A/60A
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed only by qualified service technicians who are throughly familiar with all safety checks and the servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems which are separated by insulating material. The non­isolated (hot) ground system is for the B+ voltage regulator circuit and the horizontal output circuit. The isolated ground system is for the low B+ DC voltages and the secondary circuit of the high voltage transformer. To prevent electrical shock use an isolation transformer between the line cord and power receptacle, when servicing this chassis.
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
When servicing the high voltage system, remove the static charge by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the pic­ture tube ground and the anode lead. (AC line cord should be disconnected from AC outlet.)
1. Picture tube in this receiver employs integral implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage anode completely.
X-RADIATION AND HIGH VOLTAGE LIMITS
1. Be sure all service personnel are aware of the procedures and instructions covering X-radiation. The only potential source of X-ray in current solid state TV receivers is the picture tube. However, the picture tube does not emit measurable X-Ray radiation, if the high voltage is as specified in the "High Voltage Check" instructions. It is only when high voltage is excessive that X­radiation is capable of penetrating the shell of the picture tube including the lead in the glass material. The important precaution is to keep the high voltage below the maximum level specified.
2. It is essential that servicemen have available at all times an accurate high voltage meter. The calibration of this meter should be checked periodically.
3. High voltage should always be kept at the rated value
no higher. Operation at higher voltages may cause a failure of the picture tube or high voltage circuitry and;also, under certain conditions, may produce radiation in exceeding of desirable levels.
4. When the high voltage regulator is operating properly there is no possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be tested while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly.
5. Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry.
6. When trouble shooting and taking test measurements on a receiver with excessive high voltage, avoid being unnecessarily close to the receiver. Do not operate the receiver longer than is necessary to locate the cause of excessive voltage.
2
2 2
IMPORTANT SERVICE SAFETY PRECAUTION
1.5k ohm 10W
0.15µF
TEST PROBE
CONNECT TO KNOWN EARTH GROUND
TO EXPOSED METAL PARTS
AC
VOLTMETER
(Continued)
20LK30A/60A
BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)
Before returning the receiver to the user, perform the following safety checks.
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity networks, mechanical insulators, etc.
3. To be sure that no shock hazard exists, check for leakage current in the following manner.
Plug the AC cord directly into a 1 10~220 volt AC outlet, (Do not use an isolation transformer for this test).
Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to earth ground.
Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity to measure the AC voltage drop across the resistor.
Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC ine cord plug connection reversed. (If necessary, a non­polarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.5 milliamp. Any measurements not within the limits outlined above indicate of a potential shock hazard and corrective action must be taken before returning the instrument to the customer.
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SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features are identified by "å" and shaded areas in the Replacement Parts Lists and Schematic Diagrams.
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For continued protection, replacement parts must be identical to those used in the original circuit. The use of substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire, X-radiation or other hazards.
3
20LK30A/60A
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (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.
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 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 20.6 ± 1.5V.
5. Apply external 26.8V 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.
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. Enter the service mode and select the service adjustment "S19" and Bus data "01" (Y-mute on).
4. The voltage should be approximately, 26.5kV (at zero beam). If a correct reading cannot be obtained, check circuitry for malfunctioning components. After the voltage test, make Y-mute off to the normal mode.
5
20LK30A/60A
For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit.
Note: There are still a few analog adjustments in this series such as focus and master screen voltage.
Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv­ice adjustments are required.
1. Service mode
Before putting unit into the service mode, check that customer adjustments are in the normal mode. Use the reset function in the video adjustment menu to ensure customer controls are in their proper (reset) position.
2. Service number selection
Once in the service mode, press the Ch-up or Ch­down button on the remote controller or at the set. The service adjustment number will vary in increments of one, from "S01" to "M05". Select the item you wish to adjust.
3. Data number selection
Press the Vol-up or down button to adjust the data number.
DATA NUMBER (HEX) (HEXADEC: MAL)
SERVICE ADJUSTMENT NUMBER
To enter the service mode and exit serv­ice mode.
While pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket. Now the TV set is switched on and enters the service mode. To exit the service mode, turn the television off by pressing the power button.
CHANNEL
S01
Figure A.
55
02
S01 D:00
6
20LK30A/60A
SERVICE
NUMBER
S01 PICTURE 55 00-7F S02 TINT 46 00-7F S03 COLOR 32 00-7F S04 BRIGHTNESS 40 00-7F S05 SHARPNESS 28 00-3F Must be set to "24" S06 VERTICAL PHASE 00 00-07 Must be set between "0" to "03" S07 HORIZONTAL PHASE 12 00-1F S08 RF-AGC 2A 00-3F S09 VERTICAL AMP 20 00-3F S10 VCO 2C 00-7F S11 R CUT-OFF 00 00-FF S12 G CUT -OFF 00 00-FF S13 B CUT-OFF 00 00-FF S14 G GAIN 7F 00-FF S15 B GAIN 7F 00-FF S16 TRAP(3.58MHz) 00 00 or 01 Must be set to "00" S17 BALANCE 20 00-3F Must be set to "20" S18 C.C.POSITION 18 00-7F S19 Y-MUTE 00 00,01,03 "00"=Normal, "01"=No-Y, "03"=No Vertical OP. OPTION (Set to each model) 80 00-FF Must be set to "08"=20LK30A, "09"=20LK60A M01 MTS LEVEL 0A 00-0F M02 STEREO-VCO 20 00-3F M03 FILTER 1C 00-3F M04 LOW SEPARATION 20 00-3F M05 HIGH SEPARATION 1B 00-3F
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
Table - A
Holding down both the CH-up/down buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101.
PART REPLACED
IC2001
IC201 X
IC2101
CRT IC3001
(20LK60A)
ADJUSTMENT
NECESSARY
X
X X
UNNECESSARY
X
Data is stored in IC2101.
The adjustment is needed to compensate for characteristics of parts including IC201.
Holding down both the CH-up/down buttons on the TV set in the service mode for more than 2 seconds will automatically write the above initial values into IC2101.
Adjust items related to picture tube only.
Adjust items related to MTS only (M01~M05).
NOTES
Table - B
7
20LK30A/60A
Ë
SERVICE ADJUSTMENT
VCO Adjustment
1. Connect a digital voltmeter between pin (44) of IC201 and ground.
2. Receive a good local channel.
3. Enter the service mode and select the service adjustment "S10".
4. Adjust the data so that digital voltmeter reads 2.2V.
5. Adjustment is completed, remove the voltmeter, return to "normal" mode.
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "S08".
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. Note 1 : You will have to come out of the service
mode to select another channel.
Note 2 : Setting the data to "00" will produce a black
raster.
Screen Adjustment
1. Connect a digital voltmeter between TP852 and TP853 on the CRT socket PWB. Note : These test points may not be provided.
Then connect the voltmeter to both ends of R852 located near Q852 on the foil side.
2. Receive a good local channel.
3. Enter the service mode and select the service adjustment "S03" and set the data value to "00" to set the color level to minimum. (Record original data code under adjustment "S03" before changing) You may skip this step, if you selected a B/W picture or monoscope pattern.
4. Select the service adjustment "S19" and adjust the data value to "01", this turn off the luminance signal (Y-mute).
5. Select the service adjustment "S04" and adjust data value to obtain 0.17 volts on the oscilloscope screen.
6. Adjust the master screen control until the raster darkens to the point where raster is barely seen.
7. Adjust the service adjustments "S11" red, "S12" green and "S13" blue to obtain a good grey scale with normal whites at low brightness level.
8. Select the service adjustment "S19" and reset data to "00". Select the service adjustment "S03" and reset data to obtain normal color level.
9. Remove digital voltmeter, and reset the master screen control to obtain normal brightness range.
White Balance Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "S03" and set to "00" (minimum color). "S03" does not have to be adjusted, if you selected a B/W picture or monoscope pattern.
3. Alternately adjust the service adjustment data of "S14" and "S15" until a good grey scale with normal whites is obtained.
4. Select the service adjustment "S03" and adjust data to obtain normal color level.
Sub-Picture Adjustment
1. Receive a good local channel.
2. Make sure the customer picture control is set to maximum.
3. Enter the service mode and select the service adjustment "S01".
4. Adjust the data value to achieve normal contrast range.
Sub-Tint Adjustment
1. Receive a good local channel.
2. Set customer tint control to center of it's range.
3. Enter the service mode and select the service adjustment "S02".
4. Adjust "S02" data value to obtain normal flesh tones.
+115V DC REGULATOR Adjustment
The +115V DC Adj. control (R721) is adjusted at the factory . However, should readjustment be required, proceed as follows:
1. Actuate the receiver with 220V AC input voltage.
2. Select a local channel.
3. Connect positive lead of Digital Voltmeter to R603 TP751 (positive side) on PWB-A; negative lead to chassis ground.
4. Adjust R721 to obtain a +115V DC reading.
CAUTION: The reading should be within +1 15V ±1VDC
to ensure normal function and circuitry reliability.
8
20LK30A/60A
Sub-Color Adjustment
1. Receive a good local channel.
2. Make sure the customer color control is set to center position .
3. Enter the service mode and select the service adjustment "S03".
4. Adjust "S03" data value to obtain normal color level.
Sub-Brightness Adjustment
1. Receive a good local channel.
2. Make sure the customer brightness control is set to center position.
3. Enter the service mode and select the service adjustment "S04".
4. Adjust "S04" data value to obtain normal brightness level.
Vertical-Size Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "S09".
3. While observing the top and bottom of the screen, adjust "S09" data value to proper vertical size.
Vertical Phase Adjustment
1. Enter the service mode and select the service adjustment "S06".
2. Adjust data value to "00" ~ "03" so that picture is approximate center. Note: This must be set "00" ~ "03" when adjust
another data retrace line will be appear.
Horizontal Position Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "S07".
3. Adjust "S07" data value so that picture is centered.
Caption Position Adjustment (Horizontal)
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "S18".
3. A black text box appears on the screen. (see Figure B. below)
4. Adjust "S18" data value so that text box is positioned in the center of the screen.
3.58MHz Trap Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "S16".
3. This is a two position adjustment, "00" is ON, "01" is OFF.
4. Adjust data value to "00" for normal viewing.
Sharpness and Audio Balance Adjust­ments
1. Receive a good local channel.
2. Enter the service mode and select the service adjustments "S05" for sharpness and "S17" for balance.
» Sharpness Adjustment
3. Adjust data value to "24"(center of data range) for sharpness adjustment.
» Audio Balance Adjustment
4. Adjust data value to "20"(center of data range) for audio balance adjustment.
Figure B.
9
20LK30A/60A
Ë
MTS ADJUSTMENT
(Only for 20LK60A)
MTS Level Adjustment
1. Feed the following monaural signal to pin (14) of IC3001.
Monaural signal : 300Hz, 245mVrms
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode and select the service adjustment "M01".
4. Adjust the data so that the rms voltmeter reads.
Spec.: 490 ±10mVrms.
MTS VCO Adjustment
1. Keep the unit in no-signal state.
2. Connect the frequency counter to pin (39) of IC3001.
3. Connect a capacitor (100µF, 50V) in between positive(+) side of C3005 and ground.
4. Enter the service mode and select the service adjustment "M02"
5. Adjust the data so that the frequency counter reads.
Spec.: 62.94 ±0.75kHz.
Filter Adjustment
1. Feed the following stereo pilot signal to pin (14) of IC3001 . Stereo pilot signal: 9.4kHz, 600mVrms.
2. Enter the service mode and select the service adjustment "M03".
3. Adjust the data at the point where "OK" appears on the screen. The "OK" represents the approximate center of the adjustable range of the data.
Separation Adjustment
1. Connect the rms voltmeter to pin (39) of IC3001.
2. Receive the following composite stereo signal 1. Composite stereo signal: 30% modulation, left channel only, noise reduction on, 300Hz
3. Enter the service mode and select the service adjustment "M04".
4. Adjust the data until the AC voltage reading of the rms voltmeter is minimum.
5. Receive the following composite stereo signal 2. Stereo signal: 30% modulation, left channel only, noise reduction on, 3kHz
6. Enter the service mode and select the service adjustment "M05".
7. Adjust the data until the AC voltage reading of the rms voltmeter is minimum.
8. Take the above steps 1 thru 8 again for fine adjustment.
10
MODEL 20LK30A CHASSIS LAYOUT
20LK30A/60A
H
PWB-B
G
PWB-C
PWB-A
F
E
D
C
B
A
11
654321
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