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Sharp QT-80W, Service Manual

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Sharp QT-80W Service Manual Download Page 11

QT-80W

– 11 –

Figure 11 SCHEMATIC DIAGRAM (2/2)

7

8

9

10

11

12

IC201: BA3313L

OUT 1

NF 1

IN 1

GND

150K

IN 2

NF 2

ALC

150K

ALC

N.C.

GND(SUB)

VCC

FILTER

OUT 2

1

3

5

7

9

11

2

4

6

8

10

12

IC101: LA1186N

IC401: BA5415A

VRE1

RF

MIX

REG

BUTTER

OSC

ST. BY

33K

240

47

µ

47

µ

100

µ

240

33K

GND

44K

44K

0.1

µ

0.1

µ

47

µ

1000

µ

1000

µ

VCC

RL

1000

µ

47

µ

RL

IC102: LA1805

Vcc

FM

AM

RF AMP

MIX

RNG.

OSC

GND

AGC

AM IF

DET

LEVEL DET

TUNING
INDIC.
DRIVE

FM IF

DCT

MUTING

POST
AMP.

PILOT DET

PHASE DET

DECODER

VCO

FF

STEREO
SW

FF

TNG.

STEREO
INDIC.
DRIVE

Vcc

FF

3

5

1 2

20

17

16

11

13

15

14

21

7

10

9

18

19

8

12

4

6

24

23

22

1

2

3

4

5

6

7

8

9

6

1

3

2

11

10

12

8

9

7

5

4

3

2

1

1

2

3

4

1

3

7

5

4

2

6

1

3

7

5

4

2

6

C420

1000P

STAND-BY

+12V DC

1

1

2

2

0V

AC 220-240 V

AC 110-127 V/220-240 V,

50/60 Hz

AC POWER 

SUPPLY CORD

AC 110-127 V/

       220-240 V,

    50/60 Hz

BATTERY (+12V)

5

5

4

3

2

1

4

3

2

1

4

3

2

1

4

3

2

1

L-CH
SPEAKERS

6 OHM

6 OHM

6 OHM

6 OHM

RECORD SIGNAL

PLAYBACK SIGNAL

FM SIGNAL

MW/SW1/SW2 SIGNAL

MAIN PWB-A1

R-CH
SPEAKERS

BATTERIES
DC 12 V [ "D" SIZE
(UM/SUM-1, R20 or 
HP-2)BATTERY x 8 ]

VOLUME PWB-A4

HEADPHONES
PWB-A3

BATTERY
PWB-A6

X-BASS PWB-A5

OFF

OFF

ON

ON

12

6

5

4

7

9

8

10

11

2

1

3

S302-A

S302-B

VR301-A

VR301-B

S301-A

IC401

AC 110-127 V

3

1

3

6

5

1

+B

+B

+B

+B

+B

+B

+B

+B

+B

+B

IC BLOCK DIAGRAM

TAPE(STAND-BY)

FM(ST)

FM(MONO)/BEAT

LINE

S301

FUNCTION/

BEAT CANCEL

MOTOR

CONTROL

REGULATOR

VOLUME

CONTROL

VOLUME

CONTROL

X-BASS

CONTROL

X-BASS

CONTROL

R221

220

R305

4.7K

CN302

S302

X-BASS

R308

4.7K

CON504

D401

1N4148-T72

Q401

3DA8050

C514

100/16

ZD401

TZX10V C

R410

560

C415

100/16

Q304

2SC945

R326

22K

R309

6.8K

R310

3.9K

R318

10K

C302
220P

C306

1/50

C307

1/50

R312
330K

R321

4.7K

R322

4.7K

C310

0.15(ML)

C312

0.15(ML)

C309

0.0015(ML)

C311

0.0015

(ML)

CON303

CN303

R307

3.9K

R306

6.8K

R325

22K

R311
330K

C305

1/50

C301
220P

C256

1000/16

R317

10K

C308

1/50

R313

470

Q301

2SC945

VR301
50K(B)

R315

2.2K

R316

470

Q302

2SC945

Q404

SS8550

R409

2.2

R431

22K

R432

1K

D404

1N4148

D403

1N4148

R433

1K

R434

22K

R401

1K

R402

1K

R404

33K

R403

33K

R406

220

R405

220

C402

1/50

C404
47/16

R423

47K

R413

3.3

C401

1/50

C416

100/16

C403
47/16

C413

470/16

C407
47/16

C409

1000/16

C417

0.1

C411

0.1(ML)

C405

0.1

C412

0.1(ML)

C406

0.1

C408
47/16

R414

3.3

C410

1000/16

IC401

BA5415A

POWER AMP.

Q405

SS8550

C512

3300/16

C511

0.1

C501

0.02

C502

0.02

C503

0.02

C504

0.02

D501

1N4004S

D502

1N4004S

D503

1N4004S

D504

1N4004S

F501

T2A L 250V

CON502

CON601

T501

POWER

TRANSFORMER

SO501

AC INPUT SOCKET

CON501

CN501

R408

150

R407

150

JK401

HEADPHONES

CON503

CN503

Q303

2SC945

C419

1000P

SP503

SP504

SP501

SP502

SW501

VOLTAGE

SELECTOR

VOLUME

R314

2.2K

Summary of Contents for QT-80W

Page 1: ...DE OF P W BOARD 12 NOTES ON SCHEMATIC DIAGRAM 14 TYPES OF TRANSISTOR 14 VOLTAGE 14 PARTS GUIDE EXPLODED VIEW In the interests of user safety the set should be restored to its original condition and only parts identical to those specified should be used SERVICE MANUAL SHARP CORPORATION No S4129QT80W This document has been published to be used for after sales service only The contents are subject to...

Page 2: ...QACCL0008AW00 AC 110 127 220 240 V 50 60 Hz DC 12 V D size UM SUM 1 R20 or HP 2 battery x 8 20 W MPO 18 W 9 W 9 W AC operation 10 T H D RMS 10 W 5 W 5 W DC operation 10 T H D 8 cm 3 1 8 full range speaker x 4 Headphones 16 50 ohms recommended 32 ohms Mixing microphone 600 ohms Line input 350 mV 47 kohms Width 520 mm 20 1 2 Height 191 mm 7 1 2 Depth 216 mm 8 1 2 4 2 kg 9 3 lbs without batteries Gen...

Page 3: ...ise 5 Reassemble the front cabinet 01 Function Beat Cancel Switch 02 Cassette Compartment 03 Record Button 04 Play Button 05 Rewind Button 06 Fast Forward Button 07 Stop Eject Button 08 Pause Button 09 Volume Control 10 Band Selector 11 Built in Microphone 12 Extra Bass Button 13 Fine Tuning Control 14 Tuning Control 15 Mixing Microphone Socket 16 Line Input Sockets 17 AC Voltage Selector 18 AC In...

Page 4: ...ly plug from the wall outlet before starting to disassemble the unit 3 Take off nylon bands or wire holders where they need to be removed when disassembling the unit After servicing the unit be sure to rearrange the leads where they were before disassembling 4 Take sufficient care on static electricity of integrated circuits and other circuits when servicing G1 x2 ø3x12mm C2 x2 ø4x14mm G2 x1 ø3x8m...

Page 5: ...1 x 2 pcs to remove the record playback head 2 Remove the hooks A2 x 2 pcs toward the center position as shown in Fig 5 3 and then extract the erase head upward Note After replacing the heads and performing the azimuth adjustment be sure to apply screwlock How to remove the pinch roller See Fig 5 4 1 Remove the screw B1 x 1 pc and remove the pinch roller upwards Figure 5 3 Figure 5 4 REMOVING AND ...

Page 6: ...ote When mounting the motor pay attention to the motor bracket angle Figure 6 1 Figure 6 2 Figure 6 3 How to remove the flywheel See Fig 6 3 1 Remove the belt See Fig 6 1 2 Remove the stop washer E1 x 1 pc with a small precision screwdriver to extract the flywheel from the capstan metal Note When the stop washer is deformed or damaged replace it with a new one How to reinstall the parts Install ea...

Page 7: ... end 87 4 MHz 4 Repeat step 2 3 until no further improvement can be made 5 FM TRACKING Same as step 2 Same as step 2 Same as step 1 Adjust P V C TC2 to Tune P V C to fH 106 MHz get MAX output 106 MHz 6 FM TRACKING Same as step 2 Same as step 2 Same as step 1 Adjust L102 to get MAX Tune P V C to fL 90 MHz output 90 MHz 7 Repeat step 5 6 and then step 2 3 5 6 until no further improvement can be made...

Page 8: ...osition oscilloscope 3 Tune P V C to 3 Power supply high end 2 SW1 BAND Same as step 1 Same as step 1 Same as step 1 Adjust T104 get MAX Tune P V C to low COVERAGE fL output at 2 25 MHz end 2 25MHz 3 Repeat step 1 2 until no further improvement can be made 4 SW1 Same as step 1 Same as step 1 Same as step 1 Adjust CT104 get MAX Tune P V C to 6 MHz TRACKING fH output at 6 MHz 6 MHz 5 SW1 Same as ste...

Page 9: ...back Head Tape Mechanism TP2 FM BAND COVERAGE FM DETECTION BIAS OSCILLATION FM TRACKING fL fH MW BAND COVERAGE fH MW TRACKING fH T105 T104 T103 CT101 CT102 T106 VR102 IC102 T102 CT104 T107 T101 CT103 T108 TUNER P V C L103 IC101 1 9 L102 T201 IC201 MAIN PWB L109 MW BAR ANTENNA TC1 TC2 TC3 TC4 MW BAND COVERAGE fL SW1 BAND COVERAGE fH fL SW1 TRACKING fL fH SW2 TRACKING fL fH SW2 BAND COVERAGE fL fH M...

Page 10: ... C235 47 16 Q204 SS8550 C231 1 50 R233 1 8K C230 0 01 ML CON301 R301 10K R303 10K R302 2 2K R304 2 2K R211 18K C211 0 0022 ML R212 18K C212 0 0022 ML T201 BIAS OSCILLATION C216 0 0027 C223 100P R253 10K R254 10K CON201 CN201 C251 0 018 ML C220 0 0068 ML C219 0 022 ML Q201 3DA8050 R247 220 C218 47 16 R225 22K R224 10 C207 0 47 50 C208 0 47 50 C206 0 022 ML R231 120K C201 0 0015 ML R204 150 R208 5 6...

Page 11: ...01 AC 110 127 V 3 1 3 6 5 1 B B B B B B B B B B IC BLOCK DIAGRAM TAPE STAND BY FM ST FM MONO BEAT LINE S301 FUNCTION BEAT CANCEL MOTOR CONTROL REGULATOR VOLUME CONTROL VOLUME CONTROL X BASS CONTROL X BASS CONTROL R221 220 R305 4 7K CN302 S302 X BASS R308 4 7K CON504 D401 1N4148 T72 Q401 3DA8050 C514 100 16 ZD401 TZX10V C R410 560 C415 100 16 Q304 2SC945 R326 22K R309 6 8K R310 3 9K R318 10K C302 2...

Page 12: ...04 Q303 R223 R222 R217 R243 R244 R326 R325 C308 R311 C305 R218 R306 R316 Q301 Q302 C301 R313 C307 R312 C306 C302 R305 R307 R309 R308 R310 C303 C304 CON302 S301 C310 CON303 C311 C312 1 1 2 3 4 5 6 7 2 3 4 E C B Q501 CON201 R501 C516 C416 S201 RECORD PLAYBACK ZD501 C415 R410 C514 Q401 E E B B C C 1 1 2 3 4 5 6 7 8 9 10 11 12 2 3 4 C518 ZD401 C417 R405 C402 D401 C401 R403 R404 C403 R321 R401 C404 R42...

Page 13: ...R CH CN503 BK BK RD RD BK RD BK RD BR COLOR TABLE RD R OR YL GR BL BROWN RED ORANGE YELLOW GREEN BLUE JACK PWB A2 VOLUME PWB A4 1 7 1 2 3 CN202 CN301 5 4 3 2 1 WH PK WH X BASS PWB A5 7 6 5 4 3 2 1 CN303 RD RD RD BK 1 SW501 VOLTAGE SELECTOR AC 220 V 240 V AC 110 V 127 V BL BK WH VL GY WH W BK PK VIOLET GRAY WHITE BLACK PINK T501 POWER TRANSFORMER YL YL PK WH WH CN302 1 2 3 1 3 HEADPHONES PWB A3 CN5...

Page 14: ...N POSITION E C B FRONT VIEW 2SC945 3DA8550 SS8550 E B C FRONT VIEW 3DA8050 IC101 LA1186N FM Pin No Voltage IC201 BA3313L PLAYBACK Pin No Voltage IC102 LA1805 FM Pin No Voltage Pin No Voltage IC102 LA1805 MW SW1 SW2 Pin No Voltage Pin No Voltage IC401 BA5415A FULL POWER Pin No Voltage Q404 SS8550 Pin No Voltage Q405 SS8550 Pin No Voltage Q501 3DA8050 Pin No Voltage Q301 2SC945 Pin No Voltage Q207 2...

Page 15: ...type VC MF Cylindrical type without lead wire VC MN Cylindrical type without lead wire VC TV Square type without lead wire VC TQ Square type without lead wire VC CY Square type without lead wire VC CZ Square type without lead wire VC J The 13th character represents capacity difference J 5 K 10 M 20 N 30 C 0 25 pF D 0 5 pF Z 80 20 If there are no indications for the electrolytic capacitors error is...

Page 16: ...F 50V Mylar C127 129 VCEAZA1HW105M J AB 1 µF 50V Electrolytic C131 VCTYPA1HB152K J 1500 pF 50V C132 133 VCEAZA1HW335M J AB 3 3 µF 50V Electrolytic C134 VCTYPA1HB471K J 470 pF 50V C135 VCQYKA1HM822K J AA 0 0082 µF 50V Mylar C136 VCTYPA1HM472K J 4700 pF 50V C137 VCKYPA1CF224Z J 0 22 µF 16V C138 VCEAZA1CW227M J AC 220 µF 16V Electrolytic C139 VCKYPA1HF203Z J 0 02 µF 50V C141 VCCCPA1HH100J J AA 10 pF ...

Page 17: ...ctor Ass y 3Pin CN302 92L3421 777001 J Connector Ass y 3Pin CN303 92L3421 780001 J Connector Ass y 7Pin CN501 92L3421 778001 J Connector Ass y 5Pin CN503 92L3421 783001 J Connector Ass y 4Pin CN504 92L3421 774001 J Connector Ass y 4Pin CON201 202 92L3101 054003 J Plug 4Pin CON203 92L3101 054001 J Plug 2Pin CON301 302 92L3101 054002 J Plug 3Pin CON303 92L3101 054006 J Plug 7Pin CON501 92L3101 09400...

Page 18: ...L66090752012 J Nut ø9 ø12 2mm 619 92L62030061070 J Screw ø3 10mm 620 92L61440041010 J Screw ø4 10mm 621 92L53008003008 J Washer ø3 ø8 0 8mm ACCESSORIES PACKING PARTS 1 QACCB0012AW00 J AS AC Power Supply Cord 1 QACCE0007AW00 J AH AC Power Supply Cord 1 QACCL0002AW00 J AN AC Power Supply Cord 1 QACCL0008AW00 J AC Power Supply Cord 1 QPLGA0003AWZZ J AF Adaptor AC Plug 1 QPLGA0004AWZZ J AF Adaptor AC ...

Page 19: ...620 230 233 612 239 616x2 615x2 621 209 207 614 609 601 226 208 606 211 238 603 214 PWB A1 619x2 204 213 204 2 204 1 236 224 223 215 217 219 216 237 218 220 232 604 203 240x2 203 1 203 2 606x3 613x4 SP501 212 225 221 618 SP502 SP503 201 MIC SP504 613x4 611x3 222 235 613x4 613x4 229 TAPE MECHANISM 241 241 1 241 2 241 3 241 4 241 5 M601 241 6 SW601 PWB A5 PWB A4 Motor M601 REW FF Clutch Flywheel FF ...

Page 20: ...by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher COPYRIGHT 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED A0105 1213DS HA C SHARP CORPORATION AV Systems Group Audio Systems Division Higashihiroshima Hiroshima 739 0192 Japan Printed in Japan EX ...

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