SHARP 27R-FS1 Service Manual

27R-FS1

SERVICE MANUAL

S61W527R-FS1/

COLOR TELEVISION

Chassis No. V01A

MODEL

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.

27R-FS1

CONTENTS

Page

» ELECTRICAL SPECIFICATIONS ...........................................................................................................1

» IMPORTANT SERVICE SAFETY PRECAUTION ...................................................................................2

» LOCATION OF USER'S CONTROL .......................................................................................................4

» INSTALLATION AND SERVICE INSTRUCTIONS..................................................................................5

» CHASSIS LAYOUT ...............................................................................................................................12

» BLOCK DIAGRAM ................................................................................................................................14

» SCHEMATIC DIAGRAMS.....................................................................................................................16

» PRINTED WIRING BOARD ASSEMBLIES ..........................................................................................28

» REPLACEMENT PARTS LIST..............................................................................................................34

» PACKING OF THE SET........................................................................................................................47

ELECTRICAL SPECIFICATIONS

POWER INPUT...................................................... 120V AC 60 Hz

POWER RATING .................................................................. 134W

PICTURE SIZE ........................................ 1,240cm2 (192.2sq 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 .................... 5W + 5W (at 10% distortion and

Dual CH Operate)

SPEAKER

SIZE ..................................................................... 10 cm (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

(EIA, Channel Plan U.S.A.)

Specifications are subject to change without prior notice.

SHARP CORPORATION

This document has been published to be used for after sales service only. The contents are subject to change without notice.

27R-FS1

IMPORTANT SERVICE SAFETY PRECAUTION

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 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.

CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE

6.3A 125V

ONL Y WITH SAME TYPE 6.3A125V 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 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 colour 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.

IMPORTANT SERVICE SAFETY PRECAUTION

1.5k ohm 10W

0.15µF

TEST PROBE

TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

VOLTMETER

(Continued)

27R-FS1

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 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, 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.

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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.

27R-FS1

Front Panel

POWER

Press → On. Press again → Off.

LOCATION OF USER'S CONTROL

VIDEO/AUDIO IN 2 TERMINALS

SENSOR AREA FOR REMOTE CONTROL

VOLUME UP/DOWN

(+) Increases sound. (–) Decreases sound.

CHANNEL UP/DOWN

(

) Selects next higher channel.

( ) Selects next lower channel.

Basic Remote Control Functions

POWER

Press → On. Press again → Off.

REMOTE KEYPAD

Accesses any channel from keypad.

FLASHBACK

Returns to previous channel.

PERSONAL PREFERENCE

With the Personal Preference buttons, you can program your favorite programs by using the 4 categories A, B, C and D. The channels can be accessed quickly by using these buttons.

VOLUME UP/DOWN

(+) Increases sound. (–) Decreases sound.

• In menu mode, changes or selects the TV adjustments.

Press → Accesses MAIN MENU. Press again → Exits MAIN MENU.

CATV/DVD-TV/VCR MODE SELECT SWITCH

In TV/VCR position, sends power and channel select commands (Channel up/down and Random Access buttons) to the TV and VCR control. In CATV/DVD position, sends power and channel select commands to a cable TV converter and DVD control.

DVD/VCR CONTROL

POWER

DVD VCR

DISPLAY

1 2 3 4 5 6 7 8 9

FLASHBACK

PERSONAL PREFERENCE

A B C D

VOL

—

MENU MUTE

REW PLAY FF

PA USE

TV • CATV • VCR • D VD

STOP REC

ENTER

100

CATV TV

DVD VCR

CH/SKIP

INPUT

VOL

(INSIDE DOOR)

MENU.

Press → Accesses MAIN MENU. Press again → Exits MAIN MENU.

Infrared Transmitter Window

DISPLAY

Press → Displays receiving channel for four seconds. Press again → Removes display.

• Temporarily displays receiving channel when in Closed Caption mode.

INPUT

Press → Switch to external video INPUT 1 mode. Press 2 times → Switch to external video INPUT 2 mode. Press 3 times → Switch to external video INPUT 3 mode or COMPONENT

mode. Press 4 times → Switch back to the original TV mode.

ENTER

Used in some instances where a Cable Converter Box requires an “enter” command after selecting channels, when using the REMOTE KEYPAD button.

CHANNEL UP/DOWN

') Selects next higher channel.

(

( ) Selects next lower channel.

Moves the “»” mark of the MENU

• screens.

MUTE

Press → Mutes sound. Press again → Restores sound.

• CLOSED CAPTION appears when sound is muted.

Note:

• The above shaded buttons on the Remote Control glow in the dark. To use the glow-in-the-dark display on the remote control, place it under a fluorescent light or other lighting.

• The phosphorescent material contains no radioactive or toxic material, so it is safe to use.

• The degree of illumination will vary depending on the strength of lighting used.

• The degree of illumination will decrease with time and depending on the temperature.

• The time needed to charge the phosphorescent display will vary depending on the surrounding lighting.

• Sunlight and fluorescent lighting are the most effective when charging the display.

27R-FS1

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 6.3A fuse (F701), mounted on PWB-C, 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 v oltage 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 TP653 and make sure that the voltmeter reads 11.10±0.9V.

5. Apply external 14.5V DC at TP653 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 VOLT AGE 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 No. "V10" and Bus data "01" (Y-mute on).

4. The voltage should be approximately , 32.0kV (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.

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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-C" 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 "D01" to "OP05". Select the item you wish to adjust.

3. Data Number Selection

Press the Vol-up or down button to adjust the data number.

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.

DA T A NUMBER

CHANNEL

D01 55 2

Figure A.

16:9 ZOOM

Must be set to "01" Must be set to "14" Must be set to "15"

Must be set to "140" Must be set to "125" Must be set to "124"

Must be set to "65" Must be set to "65" Must be set to "80"

Must be set to "117" Must be set to "117" Must be set to "108"

Must be set to "50" Must be set to "50" Must be set to "50"

Must be set to "52" Must be set to "48" Must be set to "53"

Must be set to "50" Must be set to "51" Must be set to "55"

27R-FS1

ADJUSTMENT CONTENTS

RF VIDEO COMPONENT 4:3

ZOOM

16:94:3

COMPONENT

DATA

INITIAL VALUE

VIDEO

RANGE

Must be set to "00"

Must be set to "50"

Must be set to "00"

Must be set to "55" Must be set to "55" Must be set to "60"

Must be set to "15" Must be set to "15" Must be set to "15"

Must be set to "51" Must be set to "51" Must be set to "51"

Must be set to "01" Must be set to "00" Must be set to "00"

Must be set to "06"

Must be set to "00"

Must be set to "03"

Must be set to "77"

Must be set to "125"

Must be set to "52"

Must be set to "01"

Must be set to "00"

Must be set to "52"

Must be set to "57"

Must be set to "47"

Table - A

ADJUSTMENT ITEM

D01 PICTURE HEIGHT 00~63 30 19 37

D02 V-LINEARITY 00~15 09 09 08

D03 V-S CORRECTION 00~07 05 05 06

SERVICE

NUMBER

D04 PICTURE WIDTH 00~63 45 45 36

D05 E-W PARABOLA 00~31 13 08 18

D06 E-W CORNER 00~15 05 05 02

D07 TRAPEZIUM 00~15 07 07 07

D08 V-POSITION 00~127 44 46 45

D09 H-POSITION 00~31 21 21 21

D10 UPER MASK END 01~63 01 14 15

D11 LOWER MASK START 00~255 140 125 124

D12 LEFT MASK END 01~127 65 65 80

D13 RIGHT MASK START 00~127 117 117 108

D14 OFFSET V-POSITION 00~100 50 50 50

D15 OSD POSITION 00~31 25

D16 OSD SL 00~31 00

V01 PICTURE 00~63 24 24 24

V02 TINT 00~127 34 34 38

V03 COLOR 00~127 36 36 44

V04 BRIGHT 00~127 51 51 48

V05 R CUT-OFF 00~255 64 64 64

HIGH 14,500°K

ML 9,300°K

V06 G CUT-OFF 00~255 64 64 64

V07 B CUT-OFF 00~255 64 64 64

V08 G DRIVE 00~127 64 64 64

V09 B DRIVE 00~127 64 64 64

V10 Y-MUTE/V-OFF 00~01 00

V1 1 SHARPNESS OFFSET 20~83 55 55 55

V12 OFFSET PICTURE (SUB-CON) 40~55 52 48 53

V13 OFFSET BRIGHT 00~100 50 51 55

V14 SUB-CONTRAST 00~31 15 15 15

V15 OFFSET TINT (RF/VIDEO/COMPONENT) 20~70 51 51 51

V16 OFFSET TINT (S-VIDEO) 20~80 50

V17 BPF 00~01 01 00 00

V18 BLACK STRECH START POINT 00~07 06

V19 ABL POINT 00~03 00

V20 ABL GAIN 00~03 03

V21 ENERGY SAVE (ABL-CONT) 00~255 77

V22 ENERGY SAVE (SVM-CONT) 00~255 125

V23 ENERGY SAVE (BLACK LEVEL OFFSET) 00~100 52

V24 COLOR-γ 00~01 01

V25 RGB-γ 00~01 00

V26 COLOR TEMPARATURE, G DRIVE OFFSET 00~100 52

V27 COLOR TEMPARATURE, B DRIVE OFFSET 00~100 57

V28 COLOR TEMPARATURE, G DRIVE OFFSET 00~10 47

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16:9 ZOOM

ADJUSTMENT CONTENTS

DATA

RF VIDEO COMPONENT 4:3

ZOOM

16:94:3

COMPONENT

INITIAL VALUE

VIDEO

RANGE

Must be set to "40"

Must be set to "41"

Must be set to "24"

Must be set to "00" Must be set to "00" Must be set to "00"

Must be set to "01"

Table - A

ADJUSTMENT ITEM

ML 9,300°K

LOW 6,500°K

V29 COLOR TEMPARATURE, B DRIVE OFFSET 00~100 40

SERVICE

NUMBER

V30 COLOR TEMPARATURE, G DRIVE OFFSET 00~100 41

LOW 6,500°K

V31 COLOR TEMPARATURE, B DRIVE OFFSET 00~100 24

V32 CHORMA RELATIVE PHASE/AMPLITUDE 00~03 00 00 00

M01 INPUT LEVEL (ATT) 00~15 09

M02 MTS VCO 00~63 28

M03 FILTER 00~63 28

M04 WIDE BAND 00~63 18

M05 SPECTRAL 00~63 38

M06 FAO LEVEL 00~63 44

OP01 V-CHIP 00~01 01

OP02 SCREEN FORMAT 00~01 01

OP03 DEMO MODE 00~01 01

OP04 ENGL/ESPA 00~01 01

OP05 SYNC FIX at NO SIGNAL 00~01 01

SERVICE ADJUSTMENT

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Screen Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service No. "V03" and set the data value to "00" to set the color level to minimum. (Record original data code under No. "V03" before changing) Y ou may skip this step, if you selected a B/W picture or monoscope pattern.

3. Select the service No. "V10" and adjust the data value to "01", this turn off the luminance signal (Y-mute).

4. Select the service No. "V04" and adjust data value to "51".

5. Adjust the master screen control until the raster darkens to the point where raster is barely seen.

6. Adjust the service numbers "V05" red, "V06" green and "V07" blue to obtain a good grey scale with normal whites at low brightness level.

7. Select the service No. "V10" and reset data to "00". Select the service No. "V03" and reset data to obtain normal color level.

8. 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 No. "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 numbers "V08" and "V09" until a good grey scale with normal whites is obtained.

4. Select the service No. "V03" 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 No. "V01".

4. Adjust the data value to achieve normal contrast range.

Sub-Tint Adjustment

Video-Tint Adjustment

1. Enter the service mode and select the service No. "V15".

2. Adjust "V15" data value to "V02" data value.

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 No. "V03".

4. Adjust "V03" 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 No. "V04".

4. Adjust "V04" data value to obtain normal brightness level.

Vertical Linearity Adjustment

1. Receive a good CATV channel.

2. Set to standard setting mode.

3. Enter the service mode and select the service No. "D02".

4. While observing the top and bottom of the screen, adjust "D02" data value to proper vertical linearity.

Vertical Phase Adjustment

1. Enter the service mode and select the service No. "D08".

2. Adjust data value to "00". Note: This must be set "00" when changed data

retrace line will appear.

Vertical-Size Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service No. "D01".

3. While observing the top and bottom of the screen, adjust "D01" data value to proper vertical size.

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 No. "V02".

4. Adjust "V02" data value to obtain normal flesh tones.

27R-FS1

Side Pincushion Adjustment

1. Receive a good CATV channel or crosshatch pattern signal.

2. Set to standard setting mode.

3. Enter the service mode and select the service No. "D05".

4. Adjust the data of service No. "D05" so that the outermost line on the screen be straight.

Horizontal Position Adjustment

1. Receive a good CATV channel or crosshatch pattern signal.

2. Set to standard setting mode.

3. Enter the service mode and select the service No. "D09".

4. Adjust so that the left and right overscans are equal to each other.

Horizontal Size Adjustment

1. Receive a good CATV channel or crosshatch pattern signal.

2. Set to standard setting mode.

3. Enter the service mode and select the service No. "D04".

4. Vary the data of service No. "D04" to obtain the best horizontal size.

Corner Distortion Adjustment

1. Receive a good CATV channel or crosshatch pattern signal.

2. Set to standard setting mode.

3. Enter the service mode and select the service No. "D06".

4. Adjust so that the vertical lines should be straight.

Caption Position Adjustment (Horizontal)

1. Receive a good local channel.

2. Enter the service mode and select the service No. "D15".

3. A black text box appears on the screen. (see Figure B below)

4. Adjust "D15" data value so that text box is positioned in the center of the screen.

Sharpness Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service No. "V11".

3. Adjust data value to "55" (center of data range).

Trapezoidal Distortion Adjustment

1. Receive a good CATV channel or crosshatch pattern signal.

2. Set to standard setting mode.

3. Enter the service mode and select the service No. "D07".

4. Adjust so that the leftmost and rightmost vertical lines are parallel to each other.

Figure B.

MTS ADJUSTMENT

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 No. "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 No. "M02"

5. Adjust the data so that the frequency counter reads.

Spec : 62.94 ±0.75kHz.

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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 No. "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 No. "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 No. "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.

CHASSIS LAYOUT

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121110987654321

BLOCK DIAGRAM

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121110987654321

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