Sharp WQ-740W Service Manual Download Page 7

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WQ-740W/WQ-780W

– 7 –

Figure 7 TYPE OF TRANSISTOR AND LED

IFR-523 HD
IFR-553 PD

VIEW

FRONT

2SB1370
2SD2061
8050 C
9014 C
9015 C
9012 G

VIEW

FRONT

E B C

IC201 (LA1186N): FM Front End

TAPE

1.8V

1.4V

IC103 (AN6884): Sound Level Meter

6.13V

6.16V

6.5V

IC202 (LA1805): IF Amp, & FM MPX.

TAPE

1.4V

1.6V

1.4V

1.6V

5.6V

0.6V

1.5V

2.3V

2.4V

2.3V

2.4V

0.5V

TAPE

1.8V

1.5V

1.6V

0.6V

0.4V

6.6V

5.7V

6.6V

5.7V

1.67V

1.62V

1.67V

1.62V

1.4V

IC301 (TA8189N): Record/Playback Amp.

RADIO

TAPE PLAY

TAPE REC

0.98V

2.11V

1.57V

1.6V

5.7V

4.8V

1.2V

RADIO

TAPE PLAY

TAPE REC

1.4V

1.29V

1.4V

5.8V

5.7V

5.3V

IC402 (LA4558): Power Amp.

14.5V

0.01V

1.1V

7.6V

0.6V

13.6V

15V

13.7V

0.6V

7.6V

1.1V

0.01V

IC401 (BA4558): Ope Amp.

RADIO

TAPE PLAY

TAPE REC

RADIO

TAPE PLAY

TAPE REC

RADIO

TAPE PLAY

TAPE REC

RADIO

TAPE PLAY

TAPE REC

3.3V

6.7V

Q101

Q102

Q103

Q106

Q107

Q108

Q202

Q203

Q301

Q302

Q303

Q401

Q402

Q501

Q502

Q503

Q504

Q505

Q506

Q507

Q508

Q509

7.36V

7.38V

7.98V

0.32V

0.5V

7.43V

–1.74V

15.01V

1.93V

0.63V

6.52V

0.69V

6.54V

7.37V

0.98V

0.27V

1.18V

8.06V

0.7V

14.23V

0.74V

2.57V

3.27V

3.35V

7.28V

0.1V

7.3V

13.67V

2.88V

2.85V

0.27V

0.4V

5.53V

13.14V

–

0.7V

14.98V

0.12V

3.82V

7.36V

7.38V

7.98V

0.32V

0.5V

7.43V

15V

15.01V

1.93V

0.63V

6.52V

0.69V

6.54V

7.37V

0.98V

0.27V

1.18V

8.06V

0.70V

14.23V

0.74V

2.57V

3.27V

3.35V

7.28V

7.3V

13.67V

2.88V

2.85V

0.27V

0.4V

5.53V

13.14V

8.8V

0.7V

14.98V

0.12V

3.82V

0.05V

0.5V

15V

–

1.93V

–0.18V

1.18V

0.7V

0.74V

2.57V

6.2V

5.53V

8.8V

0.12V

3.82V

RADIO

TAPE REC

TAPE PLAY

TRANSISTOR

VOLTAGE

Summary of Contents for WQ-740W

Page 1: ... 740W WQ 780W SERVICE MANUAL SHARP CORPORATION No S7862WQ780W 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 This document has been published to be used for after sales service only The contents are subject to change without notice WQ 740W 9FF24801830210 AC POWER SUPPLY CORD AND PLUG 9FF24801600292 9FF...

Page 2: ... 233 Dial Drum 231 B A C Dial Pointer 234 0 Point SPECIFICATIONS Specifications for this model are subject to change without prior notice General Power source AC 110 127 V 220 240 V 50 60 Hz DC 15 V D size UM SUM 1 R20 or HP 2 battery 10 Power consumption 20 W Output power PMPO 120 W 60 W 60 W AC operation MPO Max 30 W 15 W 15 W AC operation RMS 15 W 7 5 W 7 5 W DC operation 10 T H D Speakers 12 c...

Page 3: ... 34 CD Line Input Sockets 35 Headphone Socket 36 Beat Cancel Switch 37 Battery Compartment 38 AC Power Input Socket 39 AC Voltage Selector 16 15 24 31 30 29 28 25 26 27 17 18 19 20 21 22 23 13 14 32 1 7 8 9 10 11 12 6 5 4 3 2 33 34 35 36 37 38 11 TAPE 1 Cassette Compartment 12 TAPE 1 Record Button 13 TAPE 1 Play Button 4 TAPE 1 Rewind Button 15 TAPE 1 Fast Forward Button 16 TAPE 1 Stop Eject Butto...

Page 4: ...net 1 Battery Compartment Lid 4 1 Rear Cabinet A1 x1 2 Screw A2 x1 3 Screw A3 x8 4 Socket A4 x1 2 Tape mechanism 1 Screw B1 x2 4 2 2 Socket B2 x3 WQ 740W 2 Socket B2 x4 WQ 780W 3 Open the cassette holder 4 Screw B3 x6 3 Main PWB 1 Knob C1 x1 4 2 2 Screw C2 x4 3 Socket C3 x5 4 Graphic Equalizer 1 Screw D1 x5 4 3 PWB 5 Volume PWB 1 Knob E1 x1 4 3 2 Screw E2 x2 3 Screw E3 x1 6 Power PWB 1 Screw F1 x1...

Page 5: ...ng the test circuit shown in Fig 5 connect the Pin 13 Pin 21 and ground of the IC202 with the test circuit and measure the value FM IF RF Specified Value Adjusting Point Test Stage IF T201 Input FM Antenna Detection T202 Output Pin 9 of IC202 Band fL L202 Input Antenna Coverage fH TC202 Output Headphone Socket Tracking fL 88 0 MHz L201 Load resistance fH 108 MHz TC201 32 ohms Instrument Connection...

Page 6: ...vement without prior notice Parts marked with are important for maintaining the safety of the set Be sure to replace these parts with specified ones for maintaining the safety and performance of the set REF NO DESCRIPTION SW201 BAND SELECTOR FM SW301 BEAT CANCEL C SW302 RECORD PLAYBACK PLAYBACK SW401 SURROUND MODE LIVE SELECT SW402 SURROUND ON OFF OFF SW403 DUBBING SPEED HIGH FM STEREO BUILT IN MI...

Page 7: ... 1V 1V 13 14 15 16 17 18 19 20 21 22 23 24 IC402 LA4558 Power Amp 14 5V 14 5V 14 5V 0 01V 0 01V 0 01V 1 1V 1 1V 1 1V 7 6V 7 6V 7 6V 0 6V 0 6V 0 6V 13 6V 13 6V 13 6V 0V 0V 0V 15V 15V 15V 13 7V 13 7V 13 7V 0 6V 0 6V 0 6V 1 2 3 4 5 6 7 8 9 10 7 6V 7 6V 7 6V 1 1V 1 1V 1 1V 0 01V 0 01V 0 01V 0V 0V 0V 11 12 13 14 IC401 BA4558 Ope Amp PIN RADIO TAPE PLAY TAPE REC PIN RADIO TAPE PLAY TAPE REC PIN RADIO TA...

Page 8: ...TAPE SPEED CONTROL Q504 9014 C TAPE TAPE SPEED CONTROL R508 10K R510 10K R512 10K R240 150K C260 1 50 SW404 C R241 150K L203 L204 L205 SW2 OSC C235 10P CH TC203 C236 5P CH TC204 C237 5P CH TC205 SW201 G C238 360P C239 0 0022 C240 0 0047 R223 47 R222 47 C242 0 022 R220 220 VR202 5K B FINE TUNING C241 3P CH VC204 AC BIAS CIRCUIT C210 10 16 R203 22K C311 0 0082 ML C313 4 7 50 R249 18K R250 18K C314 4...

Page 9: ...0 01 ML C469 220 16 D401 1N4001 C437 470 25 C426 100 16 C425 100 16 C424 0 0015 ML C423 0 0015 ML C422 1 50 Q402 9014 C POWER MUTE Q401 9014 C POWER MUTE C421 1 50 R421 10K R442 10K R441 10K R420 10K F1 C429 100 16 C433 1000 10 C434 1000 10 C432 0 18 ML C431 0 18 ML J1 HEADPHONES C440 10 16 R440 27K Q501 8050 C VOLTAGE REGULATOR R501 4 7 D518 1N4148 FUSE RESISTOR FUSIBLE D305 1N4148 D525 1N4148 Q5...

Page 10: ...0 R121 R126 R125 R119 R113 R 1 0 8 R 1 0 9 C 1 1 5 C117 C123 C106 R183 D136 R182 R181 R168 C149 R640 D126 D130 R637 R626 D111 D112 CNH102 R472 C472 C474 VR401 C471 C473 E B C C B E C B E E B C 1 2 3 4 5 6 7 8 9 VOLUME PWB B1 1 6 A B A B A B A B A B E C B 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 GRAPHIC EQUALIZER PWB B2 TAPE 1 TAPE 2 M501 TAPE MOTOR A B SP2 FULL RANGE SP4 SURROUND L CH SP1 FULL RANGE SP3 SUR...

Page 11: ...23 R450 C415 C408 C411 C409 SW401 C469 C422 C432 C431 C429 C437 C433 C355 Q501 E B C C508 C505 C507 C530 C319 C309 C305 C307 C516 R311 R307 R309 R336 C363 C365 C364 C366 D505 CN4 R345 R548 D518 D522 R501 R502 C352 C351 C354 Q301 T301 C356 C357 SW301 R332 C522 C430 D401 C427 C424 Q402 Q401 C421 C425 C428 C426 C423 C434 IC402 R562 C459 C450 CNS106 C263 C258 C529 D201 D526 C229 T203 C228 C227 C225 CF...

Page 12: ...09 0 0068 ML R117 4 7K VR103 B 100K B R119 4 7K R121 2 2K C111 0 0022 ML VR104 B 100K B R123 3 3K R125 3 3K R127 1 5K R129 820 C113 100P VR105 B 100K B R131 820 R133 1K B Q101 9014 C R137 680K C125 1 50 C177 500P R107 12K C115 0 022 ML C123 1 50 C121 0 0068 ML C119 0 012 ML C117 0 022 ML R138 3 9K C176 500P R136 680K Q102 9014 C C126 1 50 R108 12K B R102 1K R628 330 D128 LIVE R642 330 D132 LIVE R6...

Page 13: ...RD RD RD BK BK BK WH WH CNH110 CNS110 TO MAIN PWB SW505 VOLTAGE SELECTOR AC220 240V AC110 127V T501 POWER TRANSFORMER 280 281 279 BATTERYS DC15V D SIZE UM SUM 1 R20 or HP2 battery X10 POWER PWB C BL SO501 AC POWER INLET SOCKET AC110V 127V 50 60Hz AC220V 240V 50 60Hz BR COLOR TABLE RD R OR YL GR BL VL GY WH W BK PK BROWN RED ORANGE YELLOW GREEN BLUE VIOLET GRAY WHITE BLACK PINK ...

Page 14: ...014 C TAPE SPEED CONTROL R508 10K R510 10K R512 10K R240 150K C260 1 50 SW404 C R241 150K L203 L204 L205 SW2 OSC C235 10P CH TC203 C236 5P CH TC204 C237 5P CH TC205 SW201 G C238 360P C239 0 0022 C240 0 0047 R223 47 R222 47 C242 0 022 R220 220 VR202 5K B FINE TUNING C241 3P CH VC204 AC BIAS CIRCUIT C210 10 16 R203 22K C311 0 0082 ML C313 4 7 50 R249 18K R250 18K C314 4 7 50 R314 22K C312 0 0082 ML ...

Page 15: ...0 01 ML C469 220 16 D401 1N4001 C437 470 25 C426 100 16 C425 100 16 C424 0 0015 ML C423 0 0015 ML C422 1 50 Q402 9014 C POWER MUTE Q401 9014 C POWER MUTE C421 1 50 R421 10K R442 10K R441 10K R420 10K F1 C429 100 16 C433 1000 10 C434 1000 10 C432 0 18 ML C431 0 18 ML J1 HEADPHONES C440 10 16 R440 27K Q501 8050 C VOLTAGE REGULATOR R501 4 7 D518 1N4148 FUSE RESISTOR FUSIBLE D305 1N4148 D525 1N4148 Q5...

Page 16: ...5 R119 R113 R 1 0 8 R 1 0 9 C 1 1 5 C117 C123 C106 R183 D136 R182 R181 R168 C149 R640 D126 D130 R637 R626 D111 D112 CNH102 R472 C472 C474 VR401 C471 C473 E B C C B E C B E E B C 1 2 3 4 5 6 7 8 9 VOLUME PWB B1 1 6 A B A B A B A B A B E C B 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 GRAPHIC EQUALIZER PWB B2 TAPE 1 TAPE 2 M501 TAPE MOTOR A B SP2 FULL RANGE SP4 SURROUND L CH SP1 FULL RANGE SP3 SURROUND R CH CNH1...

Page 17: ...450 C415 C408 C411 C409 SW401 C469 C422 C432 C431 C429 C437 C433 C355 Q501 E B C C508 C505 C507 C530 C319 C309 C305 C307 C516 R311 R307 R309 R336 C363 C365 C364 C366 D505 CN4 R345 CN2 R548 D518 D522 R501 R502 C352 C351 C354 Q301 T301 C356 C357 SW301 R332 C522 C430 D401 C427 C424 Q402 Q401 C421 C425 C428 C426 C423 C434 IC402 R562 C459 C450 CNS106 C263 C258 C529 D201 D526 C229 T203 C228 C227 C225 CF...

Page 18: ...0K B R115 5 6K C109 0 0068 ML R117 4 7K VR103 B 100K B R119 4 7K R121 2 2K C111 0 0022 ML VR104 B 100K R123 3 3K R125 3 3K R127 1 5K R129 820 C113 100P VR105 B 100K B R131 820 R133 1K ML B R137 680K C125 1 50 C177 500P R107 12K C115 0 022 ML C123 1 50 C117 0 022 ML C119 0 012 ML C121 0 0068 ML R138 3 9K C176 500P R136 680K Q102 9014 C C126 1 50 R108 12K C116 0 022 ML B R102 1K R628 330 D128 LIVE R...

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