Sharp 32U-S60, 32U-S50, 36U-S60 User Manual

32U-S50, 32U-S60 36U-S60
SERVICE MANUAL
S12F332U-S50/
COLOR TELEVISION
Chassis No. MS-B
32U-S50
In the interests of user-safety (Required by saf ety regulations in some countries ) the set should be restored to its original condition and only parts identical to those specified should be used.
» ELECTRICAL SPECIFICATIONS .........................................................................................................1
» IMPORTANT SERVICE SAFETY PRECAUTION.................................................................................2
» LOCATION OF USER'S CONTROL .....................................................................................................4
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................5
» SERVICE ADJUSTMENT .....................................................................................................................9
» CHASSIS LAYOUT .............................................................................................................................12
» BLOCK DIAGRAM ..............................................................................................................................14
» SCHEMATIC DIAGRAMS ...................................................................................................................16
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................35
» REPLACEMENT PARTS LIST ............................................................................................................40
» PACKING OF THE SET ......................................................................................................................51
POWER INPUT..................................................... 120V AC 60 Hz
POWER RATING
32U-S50/60 ....................................................................... 152W
36U-S60 ............................................................................ 167W
PICTURE SIZE
32U-S50/60 ............................................. 3,073cm2 (476sq inch)
36U-S60 .................................................. 3,905cm2 (605sq 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
32U-S60 36U-S60
CONTENTS
ELECTRICAL SPECIFICATIONS
(Nominal)
MODELS
AUDIO POWER
OUTPUT RATING .............. 3.0W + 3.0W (at 10% distortion and
SPEAKER
SIZE .................................................. 12 cm x 6 cm oval (2 pcs.)
VOICE COIL IMPEDANCE .............................. 8 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.
36U-S60
Page
Dual CH Operate)
(EIA, Channel Plan U.S.A.)
32U-S50/60
SHARP CORPORATION
This document has been published to be used for after sales service only. The contents are subject to change without notice.
1
32U-S50, 32U-S60 36U-S60
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed only by qualified service technicians who are thoroughly 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. 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.
CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE
4A 125V
ONLY WITH SAME TYPE 4A­125V FUSE.
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 VOLTA GE 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. Howe ver , 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 ser vicemen 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 excessiv e high voltage, av oid 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
2
IMPORTANT SERVICE SAFETY PRECAUTION
1.5k ohm 10W
0.15µF
TEST PROBE
TO EXPOSED METAL PARTS
CONNECT TO KNOWN EARTH GROUND
(Continued)
32U-S50, 32U-S60 36U-S60
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 120 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 A C 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, etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC line 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.
234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121
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.
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32U-S50, 32U-S60 36U-S60
LOCATION OF USER'S CONTROL
32U-S50 32U-S60 36U-S60
4
32U-S50, 32U-S60 36U-S60
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 4.0A 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 120V 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 TP651 and make sure that the voltmeter reads 13.2 ±0.7V.
5. Apply external 16.3V DC at TP651 by using an external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and plug the AC cord power on. 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 120V 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 "V18" and Bus data "01" (Y -m ute on, CRT Cut Off).
4. The voltage should be approximately 33.0kV (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
32U-S50, 32U-S60 36U-S60
For adjustments of this model, the bus data is conver ted 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 "V01" to "P08". Select the item you wish to adjust.
3. Data number selection
Press the V ol-up or V ol-down button to adjust the data number.
DATA NUMBER
SERVICE ADJUSTMENT NUMBER
To enter the ser vice mode and exit serv­ice mode.
To enter the service mode manually just press and hold the Vol-down and Ch-up buttons at the same time, plug the AC cord into a wall socket. Now the TV set is switched on and enters the ser vice mode. To exit the service mode, turn the television off by pressing the power button.
CHANNEL
V01
Figure A.
55(085)
02
6
32U-S50, 32U-S60 36U-S60
SERVICE
NUMBER
V01 PICTURE 03 0-15(00h-0Fh) V02 TINT 3E 0-127(00h-7Fh) V03 COLOR 2D 0-127(00h-7Fh) V04 SUB-COLOR 10 0-31(00h-1Fh) Must be set to "10" V05 BRIGHT 4D 0-127(00h-7Fh) V06 R CUT-OFF 40 64-255(40h-FFh) V07 G CUT-OFF 40 64-255(40h-FFh) V08 B CUT-OFF 40 64-255(40h-FFh) V09 G DRIVE 40 0-127(00h-7Fh) V10 B DRIVE 40 0-127(00h-7Fh) V11 SHARP 14 0-63(00h-3Fh) Must be set to "1E" V12 N PHASE 01 0-3(00h-03h) Must be set to "01" V13 DC RESTORATION 00 0-3(00h-03h) Must be set to "00" V14 BLACK STRETCH 03 0-3(00h-03h) Must be set to "03" V15 ABL START POINT 03 0-3(00h-03h) Must be set to "03" V16 ABL GAIN 02 0-3(00h-03h) Must be set to "02" V17 γ POINT 00 0-3(00h-03h) Must be set to "00" V18 Y-MUTE/V-STOP 00 0-2 "00"=Normal, "01"=No-Y, "02"=No-Y & No-Vertical V19 ENERGY SAVE 28 0-63(00h-3Fh) Must be set to "28" V20 RTONE-G F6 0-255(00h-FFh) Must be set to "F6" V21 RTONE-B F6 0-255(00h-FFh) Must be set to "F6" V22 BTONE-G 00 0-255(00h-FFh) Must be set to "00" V23 BTONE-B 0A 0-255(00h-FFh) Must be set to "0A" V24 LOW-G F7 0-255(00h-FFh) Must be set to "F7" V25 LOW-B E8 0-255(00h-FFh) Must be set to "E8" V26 ML-G 00 0-255(00h-FFh) Must be set to "00" V27 ML-B F9 0-255(00h-FFh) Must be set to "F9" V28 HIGH-G 03 0-255(00h-FFh) Must be set to "03" V29 HIGH-B 06 0-255(00h-FFh) Must be set to "06" V30 WPS 01 0-1 Must be set to "01" V31 RGB CONTRAST 20 0-63(00h-3Fh) Must be set to "2A" V32 Y-DL 02 0-7(00h-07h) Must be set to "02" V33 Y-DL-INPUT 01 0-7(00h-07h) Must be set to "01" V34 VSM GAIN 07 0-7(00h-07h) Must be set to "07" V35 N COMB 01 0-1 Must be set to "01" V36 BPF/TOF-INPUT 00 0-1 Must be set to "00" V37 CORING 00 0-1 Must be set to "00" V38 VSM PHASE 00 0-1 Must be set to "00" V39 COLOR γ 00 0-1 Must be set to "00" V40 SHARP-INPUT 14 0-63(00h-3Fh) Must be set to "1E" V41 TINT-INPUT 3E 0-127(00h-7Fh) V53 C-TRAP 00 0-1 Must be set to "00"
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
R01 RF-AGC 24 0-63(00h-3Fh) R02 PIF VCO coil – R03 RF-AGC REF 5C 0-255(00h-FFh) Must be set to "5C"
D01 V POSITION 00 0-7(00h-07h) D02 H POSITION 10 0-31(00h-1Fh) D03 V SIZE 12 0-63(00h-3Fh) D04 H SIZE 1F 0-63(00h-3Fh) D05 V-LINEARITY 07 0-15(00h-0Fh) D06 V-S CORRECTION 08 0-15(00h-0Fh) Must be set to "08" D07 EW PARABOLA 21 0-63(00h-3Fh) D08 EW TRAPEZIUM 0E 0-31(00h-1Fh) D09 EW CORNER 0C 0-15(00h-0Fh) D10 AFC GAIN 02 0-3(00h-03h) Must be set to "02" D11 V EHT 07 0-7(00h-07h) Must be set to "07" D12 H EHT 03 0-7(00h-07h) Must be set to "03"
EX1 FAO VOLUME 24 0-50(00h-32h) Must be set to "24" EX2 CC-POSITION 21 0-127(00h-7Fh) EX3 INT 7A 0-255(00h-FFh) Must be set to "7A" EX4 A-ATT 5A 0-127
OP1 OPTION1 BO 0-255(00h-FFh) OP2 OPTION2 31 0-7(00h-07h) Must be set to "01"
Must be set to "B7" (32R-S450,36R-S450), "A7" (CR32S45,CR36S45)
Table - A
7
32U-S50, 32U-S60 36U-S60
SERVICE
NUMBER
M01 INPUT LEVEL 09 0-15(00h-0Fh) M02 MTS VCO 24 0-63(00h-3Fh) M03 FILTER 1F 0-63(00h-3Fh) M04 WIDEBAND 18 0-63(00h-3Fh) M05 SPECTRAL 10 0-63(00h-3Fh)
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
Table - A
Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2102.
PART REPLACED
IC2001 IC201
IC2102
CRT IC3001
IC1801
NECESSARY UNNECESSARY
ADJUSTMENT
X
X
X X X
NOTES
X
Data is stored in IC2102. The adjustment is needed to compensate for characteristics of parts
including IC201 and MTS level (M01). Holding down both the VOL-up and CH-up buttons on the TV set in
the service mode for more than 2 seconds will automatically write the above initial values into IC2102. Then perform a complete adjustment.
Adjust items related to picture tube only. Adjust items related to MTS only (M01~M05).
Adjust items related to P-IN-P only (P01~P08).
Table - B
8
SERVICE ADJUSTMENT
32U-S50, 32U-S60 36U-S60
VCO Adjustment
1. Connect a digital voltmeter between pin (55) of IC201 and ground.
2. Receive a good local channel.
3. Enter the service mode and select the service adjustment "R02".
4. Adjust T201 so that digital voltmeter reads
2.5±1.0VDC.
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 "R01".
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
White Balance Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "V03" and set to "00" (minimum color)(Record original data code under adjustment "V03" before changing). "V03" does not have to be adjusted, if you selected a B/W picture or monoscope pattern.
3. Alternately adjust the service adjustment data of "V09" and "V10" until a good grey scale with normal whites is obtained. (RF Input)
4. For component input, the data value of "V49" and "V50" is adjusted to follow the data value of "V09" and "V10" respectively.
5. Select the service adjustment "V03" and reset data to obtain normal color level.
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 "V01".
4. Adjust the data value to achieve normal contrast range.
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "V03" and set the data value to "00" to set the color level to minimum. (Record original data code under adjustment "V03" before changing) You may skip this step, if you selected a B/W picture or monoscope pattern.
3. Select the service adjustment "V18" and adjust the data value to "01", this turn off the luminance signal (Y-mute).
4. Adjust the master screen control until the raster darkens to the point where raster is barely seen.
5. Adjust the service adjustments "V06" red, "V07" green and "V08" blue to obtain a good grey scale with normal whites at low brightness level.
6. Select the service adjustment "V18" and reset data to "00". Select the service adjustment "V03" and reset data to obtain normal color level.
7. For component input, the data value of "V46" red, "V47" green and "V48" blue is adjusted to follow the data value of "V06", "V07" and "V08" respectively.
8. Reset the master screen control to obtain normal brightness range.
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 "V02".
4. Adjust "V02" data value to obtain normal flesh tones.
5. Input same data to "V41".
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 service adjustment "V04".
4. Adjust "V04" data value to obtain normal color level.
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 "V05".
4. Adjust "V05" data value to obtain normal brightness level.
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32U-S50, 32U-S60 36U-S60
Vertical-Size and Linearity Adjustments
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D03" for V-size.
3. Adjust the "D03" bus data to get the proper V-size.
4. For V -linearity adjustment, select data bus "D05" and adjust to get the proper vertical linearity. Note: Aging for 10 min before adjustment. After the
adjustment of V-center and V-size, re­adjustment for this V-line.
Vertical Phase Adjustment
1. Enter the service mode and select the service adjustment "D01".
2. Adjust "D01" data value so that picture is centered.
Horizontal Position Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D02".
3. Adjust "D02" 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 "EX2".
3. A black text box appears on the screen. (see
B.
below)
4. Adjust "EX2" data value so that text box is positioned in the center of the screen.
Figure
Horizontal-Size Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D04" for H-size.
3. Adjust the "D04" bus data to get the proper H-size.
EW-Parabola
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D07" for EW parabola.
3. Adjust the "D07" bus data to get the proper vertical straight line for both left and right side.
EW-Trapezium
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D08" for EW-Trapezium.
3. Adjust the "D08" bus data to get the best position display.
EW-Corner
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D09" for EW-Corner.
3. Adjust the "D09" bus data to get the best linearity for 4 corner points.
Other Adjustments
1. Enter the service mode.
2. Adjust the following data values as listed below.
Figure B.
SERVICE ADJUST DATA(Hex)
POSITION ITEM
OP1 OPTION1 130 OP2 OPTION2 31
32U-S50/60, 36U-S60
10
Ë
MTS ADJUSTMENT
MTS Level Adjustment
1. Receive the following composite signal. Monaural signal: 400Hz, 100% modulation
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode and select the service adjustment "M01" and set to "09".
4. Enter the service mode and select the service adjustment "EX4".
5. Adjust the data so that the rms voltmeter reads 490 ±10 mVrms.
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
62.94 ±0.75kHz.
32U-S50, 32U-S60 36U-S60
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 until "OK" appears in position on the screen. Make sure the "OK" is displayed almost at the center of the data range.
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 7 again for fine adjustment.
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32U-S50, 32U-S60 36U-S60
MODELS 32U-S50/60 CHASSIS LAYOUT
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32U-S50, 32U-S60 36U-S60
MODEL 36U-S60 CHASSIS LAYOUT
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32U-S50, 32U-S60 36U-S60
MODELS 32U-S50/60 BLOCK DIAGRAM
H
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