Sharp WQ-740W Service Manual

Text of Sharp WQ-740W User Guide:

• Sharp WQ-740W, WQ-740W/WQ-780W – 13 – 78 9101112 Figure 13 WIRING SIDE OF P.W.BOARD (3/5) C503 D503 C502 D502 C501 D501 C504 D504 T2A L 250V F501 P11 7-C (WQ-740W) P17 7-C (WQ-780W) 11 22 RD RD RD 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 YELLO

• Sharp WQ-740W, WQ-740W/WQ-780W – 5 – ADJUSTMENT Figure 5 VCO FREQUENCY TEST CIRCUIT TUNER SECTION fL: Low-range frequency fH: High-renge frequency Specified value Instrument Connection VR201 76 kHz ± 200 Hz Pin 13, Pin 21 and ground of IC202 Specified Value MECHANISM SECTION • Driving Force Check Specified Value • Torque Check (For WQ-740W) Play: TW-2111 30 to 60 g.cm 30 to 60 g.cm Fast forward: TW-2231 55 g.cm more 55 g.cm more Rewind: TW-2231 55 g.cm more 55 g.cm more • Head Azimuth MTT-114 Headphones Socket (Load resistance: 32 ohms) Instrument Connection • Tape Speed (Normal only) Instrument Connection MTT-111 Tape 1,2:VR501 3,000 ± 60 Hz Headphones Socket (Loadresistance

• WQ-740W/WQ-780W CONTENTS Page AC POWER SUPPLY CORD AND PLUG ........................................................................................................................... 1 SPECIFICATIONS ............................................................................................................................................................... 2 VOLTAGE SELEC

• Sharp WQ-740W, WQ-740W/WQ-780W – 12 – • NOTES ON SCHEMATIC DIAGRAM can be found on page 6. A B C D E F G H 1 2 34 5 6 Figure 12 SCHEMATIC DIAGRAM (3/6) WQ-740W R191 100 R180 2.2 R181 680 15V GND LIVE STEREO R135 3.9K VOLTAGE REGULATOR R182 33 R650 330 D135 LIVE C182 100/16 C181 0.1 C180 100/16 D131 1 6 FUSIBLE D130:IFR-523HD +B HALL 1 7 FM SIGNAL X-BASS VR101-A VR101-B VR102-A VR102-B VR103-A VR103-B VR104-A VR104-B VR105-A VR105-B 330Hz 1kHz 3.3kHz 10kHz GRAPHIC EQUALIZER C103 470/16 C102 0.1 C106 0.022 R644 68K VR101-A 50K(B) R106 12K R110 18K C108 0.01(ML) R112 8.2K VR102-A 100K(B) R114 8.2K R116 5.6K R120 4.7K C110 0.0068(ML) R118

• Sharp WQ-740W, 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 PIN FM AM TAPE 1V 0V 0V 1.8V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 5V 0V 0V 1.4V 0V 0V 4V 0V 0V 5V 0V 0V 12345 6789 IC103 (AN6884): Sound Level Meter 6.13V 6V 6V 6.16V 6V 6V 6V 6V 6V 6V 6V 6V 0V 0V 0V 6V 6V 6V 0V 0V 0V 0V 0V 0V 6.5V 6.5V 6.5V 12345 6789 IC202 (LA1805): IF Amp, & FM MPX. PIN FM AM TAPE 1.4V 1.6V 0V 1.4V 1.6V 0V 5.6V 6V 0V 0.6V 0.6V 0V 1.5V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 2.3V 2.4V 0V 2.3V 2.4V 0V 5V 0.5V 0V 1V 1V 0V 12345 6789101112 PIN FM AM TAPE 1V 1.

• Sharp WQ-740W, WQ-740W/WQ-780W NAMES OF PARTS – 3 – 16 25 32 31 30 29 26 27 28 17 18 19 20 2122 23 24 14 15 33 1 789101112 13 65432 34 35 36 37 38 39 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 Button: 17. (TAPE 1) Pause Button: 18. (TAPE 2) Reverse Mode Switch: 19. (TAPE 2) Play Button: 10. (TAPE 2) Fast Wind Buttons: 11. (TAPE 2) Stop/Eject Button: 12. (TAPE 2) Direction Switch: 13. (TAPE 2) Cassette Compartment 14. Full-Range Speaker 15. Surround Speaker 16. Mixing Microphone Sockets 17. Mixing Micropho

• Sharp WQ-740W, WQ-740W/WQ-780W – 8 – • NOTES ON SCHEMATIC DIAGRAM can be found on page 6. A B C D E F G H 1 2 34 5 6 Figure 8 SCHEMATIC DIAGRAM (1/6) WQ-740W LA GA BA RA RPRP LB GB RB D202 1N4148 1 IC201 LA1186N FM FRONT END 2 3 4 5 6 CF201 BAND PASS FILTER 108MHz C201 0.001 C202 0.001 7 8 9 L202 C211 0.022 R205 220K T202 R208 3.9K C228 1/50 R214 12K R216 2.2K R207 820K C212 0.022 SW201-A C233 0.022 C520 0.0033(ML) R354 18K R327 100K D521 1N4148 R245 100 C258 1/50 R367 18K 1 2 3 4 5 6 7 8 9 10 11 12 131415161718192021222324 IC301 TA8189N RECORD/PLAYBACK AMP. C338 47/16 R364 1M C326 2.2/50 C319 4.7/50 R317 180K C317 10/16 L361 2.

• Sharp WQ-740W, WQ-740W/WQ-780W – 4 – DISASSEMBLY Caution on Disassembly Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance: 1. Take cassette tape out of the unit. 2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit and remove the batteries from 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 th

• Sharp WQ-740W, WQ-740W/WQ-780W – 15 – Figure 15 SCHEMATIC DIAGRAM (5/6) 78 9101112 Q302 9014 C MUTE C342 470/16 Q508 9014 C MIC AMP. R557 1K R558 33 C533 4.7/50 R556 150K C532 500P C341 4.7/50 R344 4.7K R343 330 R346 470K C343 500P R552 4.7K R555 4.7K C345 0.0047(ML) R553 680 R554 680 R534 4.7K C346 4.7/50 R351 1K SW402-B D519 1N4001 VR301 50K(B) D507 1N4001 R341 10K R531 1K 6 6 1 2 0 Q303 9014 C MIC AMP. C344 4.7/50 C414 0.0033(ML) R416 10K C417 0.0033(ML) R415 10K R349 2.2K C347 10/16 R350 3.9K R345 1K D520 1N4148 SW401-C R450 4.7K D517 1N4148 R565 5.6K C536 47/16 R566 100K D402 1N4148

• Sharp WQ-740W, WQ-740W/WQ-780W – 18 – A B C D E F G H 1 2 34 5 6 Figure 18 SCHEMATIC DIAGRAM (6/6) WQ-780W R191 100 R180 2.2 R181 680 15V GND LIVE A-SIDE B-SIDE STEREO R135 3.9K Q101 9014 C VOLTAGE REGULATOR R182 33 R650 330 D135 LIVE C182 100/16 C181 0.1 C180 100/16 D131 1 6 FUSIBLE D126~D129 D132,D133 D135,D136 D130:IFR-523HD IFR-553PD +B HALL 1 7 FM SIGNAL X-BASS VR101-A VR101B VR102-A VR102-B VR103-A VR103-B VR104-A VR104-B VR105-A VR105-B 330Hz 1kHz 3.3kHz 10kHz GRAPHIC EQUALIZER C103 470/16 C102 0.1 C106 0.022 R644 68K VR101-A 50K

• Sharp WQ-740W, WQ-740W/WQ-780W – 9 – Figure 9 SCHEMATIC DIAGRAM (2/6) 78 9101112 Q302 9014 C MUTE C342 470/16 Q508 9014 C MIC AMP. R557 1K R558 33 C533 4.7/50 R556 150K C532 500P C341 4.7/50 R344 4.7K R343 330 R346 470K C343 500P R552 4.7K R555 4.7K C345 0.0047(ML) R553 680 R554 680 R534 4.7K C346 4.7/50 R351 1K SW402-B D519 1N4001 VR301 50K(B) D507 1N4001 R341 10K R531 1K Q303 9014 C MIC AMP. C344 4.7/50 C414 0.0033(ML) R416 10K C417 0.0033(ML) R415 10K R349 2.2K C347 10/16 R350 3.9K R345 1K D520 1N4148 SW401-C R450 4.7K D517 1N4148 R565 5.6K C536 47/16 R566 100K D402 1N4148 ON OFF LIVE HALL M

• Sharp WQ-740W, WQ-740W/WQ-780W – 10 – A B C D E F G H 1 2 34 5 6 Figure 10 WIRING SIDE OF P.W.BOARD (1/5) WQ-740W D115 R611 D113 R615 D114 R614 R613 R612 C147 C148 R167 R169 IC103 R636 R638 D134 1 1234567 7 R137 R112 R111 R116 R118 R122 R117 R123 D131 Q107 Q106 C191 CN207 SOUND LEVEL METER R180 Q103 C180 R628 D132 D128 D135 R650 R642 C181 C182 C183 C184 R184 C185 R643 R629 R651 D129 D133 R644 R106 R110 R632 R631 C177 C125 C116 C118 Q101 Q102 C176 R135 C124 C105 VR102 VR101 R645 C105 C108 C110 C107 C111 C114 C109 C112 VR103 VR104 R124 C120 R136 R138 C102 C103 C126 C122 R130 R103 CN205 R101 R102 R104 R191 VR105 R134 R129 C113 R1

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Sharp WQ-740W Service manual 02-04-2023 28

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