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WQ-740W
WQ-780W
AC POWER SUPPLY CORD AND PLUG ........................................................................................................................... 1
SPECIFICATIONS ............................................................................................................................................................... 2
VOLTAGE SELECTION ....................................................................................................................................................... 2
FITTING OF DIAL POINTER ............................................................................................................................................... 2
NAMES OF PARTS ............................................................................................................................................................. 3
DISASSEMBLY .................................................................................................................................................................... 4
ADJUSTMENT ..................................................................................................................................................................... 5
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 6
VOLTAGE ............................................................................................................................................................................ 7
TYPES OF TRANSISTOR AND LED ................................................................................................................................... 7
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ................................................................................................. 8
PARTS GUIDE / EXPLODED VIEW
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All manuals and user guides at all-guides.com
SERVICE MANUAL
CONTENTS
AC POWER SUPPLY CORD AND PLUG
SHARP CORPORATION
WQ-740W
WQ-780W
• 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.
DIFFERENCE BETWEEN
WQ-740W AND WQ-780W
WQ-740W
Auto Reverse
None
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This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
WQ-740W/WQ-780W
No. S7862WQ780W//
WQ-780W
Used
Page
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Summary of Contents for Sharp WQ-740W
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Page 1: Table Of Contents
WQ-740W WQ-780W WQ-740W • 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. DIFFERENCE BETWEEN WQ-740W AND WQ-780W WQ-740W WQ-780W Auto Reverse None Used WQ-780W... -
Page 2: Specifications
All manuals and user guides at all-guides.com WQ-740W/WQ-780W FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS Radio section General Power source: AC 110-127 V/220-240 V, Frequency range: FM; 88 - 108 MHz 50/60 Hz SW1;... -
Page 3: Names Of Parts
All manuals and user guides at all-guides.com WQ-740W/WQ-780W NAMES OF PARTS WQ-740W 13 14 7 8 9 10 11 17 18 19 20 21 22 23 34 35 37 38 (TAPE 1) Cassette Compartment Surround Speaker Built-in Microphone Mixing Microphone Sockets... -
Page 4: Disassembly
3. Screw ....(A3)x8 4. Socket ....(A4)x1 Main (C2)x4 Tape mechanism 1. Screw ....(B1)x2 (B2)x1 ø3x10mm 2. Socket (B2)x3 WQ-740W WQ-780W Only 2. Socket (B2)x4 WQ-780W 3. Open the cassette holder. Figure 4-2 4. Screw ....(B3)x6 Main PWB 1. -
Page 5: Adjustment
• FM IF/RF Play: TW-2412 Tape 1: Over 60 g Tape 2: Over 50 g Specified Value/ Instrument Test Stage Adjusting Connection • Torque Check (For WQ-740W) Point Torque Meter Specified Value T201 Input: FM Antenna Detection T202 Output:Pin 9 of IC202... -
Page 6: Notes On Schematic Diagram
All manuals and user guides at all-guides.com WQ-740W/WQ-780W CNS110 T301 BIAS OSCILLATION FM BAND COVERAGE FM IF T201 SW1 BAND TRACKING COVERAGE T203 CNS108 IC201 AM IF L201 L203 L202 MW BAND COVERAGE IC202 L204 T202 VR201 207 TC DETECTION... -
Page 7: Voltage
All manuals and user guides at all-guides.com WQ-740W/WQ-780W VOLTAGE TRANSISTOR RADIO TAPE PLAY TAPE REC IC103 (AN6884): Sound Level Meter Q101 0.63V 3.27V 0.63V 3.27V RADIO 6.13V 6.16V 6.5V Q102 0.63V 3.35V 0.63V 3.35V TAPE PLAY 6.5V Q103 7.36V 6.52V 7.28V... -
Page 8: Schematic Diagram / Wiring Side Of P.w.board
All manuals and user guides at all-guides.com WQ-740W/WQ-780W WQ-740W R207 820K C220 IC201 470P LA1186N C212 C218 T202 0.022 0.0047(ML) FM FRONT END R210 FM/SW R209 C222 R205 R208 150K ROD ANTENNA MIC/FM M SW201 3.3/50 FM DETECTION 220K 3.9K... - Page 9 All manuals and user guides at all-guides.com WQ-740W/WQ-780W SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/ R531 FM MODE MIC/FM MONO SW403-A R552 R344 L/FM STEREO R345 R557 R565 4.7K 4.7K MIC2 5.6K R346 H/FM STEREO C533 C344 R556 470K C341 4.7/50 4.7/50 150K 4.7/50...
- Page 10 All manuals and user guides at all-guides.com WQ-740W/WQ-780W WQ-740W PLAYBACK HEAD TAPE 2 (300-4) SW502 CNH107 CNS1 TAPE1 MAIN SW501 TAPE2 MAIN SW503 TAPE2 PLAY TAPE MECHANISM RECORD/PLAYBACK ERASE HEAD(300-3) HEAD(300-2) TAPE 1 A B + - M501 TAPE MOTOR...
- Page 11 All manuals and user guides at all-guides.com WQ-740W/WQ-780W 1 2 3 4 CNH108 CNH109 MIC101 BUILT-IN MICROPHONE C347 R351 R350 L303 L304 SW302 RECORD/ 1 2 3 4 R333 PLAYBACK R343 CNS108 C515 R330 PALY REC. C321 C353 C352 R545...
- Page 12 All manuals and user guides at all-guides.com WQ-740W/WQ-780W WQ-740W FM SIGNAL GRAPHIC EQUALIZER VR102-A VR103-A VR104-A VR105-A X-BASS VR102-B VR103-B VR104-B VR105-B VR101-A 330Hz 1kHz 3.3kHz 10kHz VR101-B R138 3.9K C176 R130 R106 R112 R118 500P 4.7K 8.2K R136 680K...
- Page 13 All manuals and user guides at all-guides.com WQ-740W/WQ-780W SO501 AC POWER INLET SOCKET AC110V-127V POWER PWB-C 50/60Hz AC220V-240V 50/60Hz CNH110 TO MAIN PWB CNS110 P11 7-C (WQ-740W) P17 7-C (WQ-780W) D504 C504 D501 C501 D502 COLOR TABLE C502 BROWN T501 RD(R)
- Page 14 All manuals and user guides at all-guides.com WQ-740W/WQ-780W WQ-780W R207 IC201 820K C220 470P LA1186N C218 C212 T202 0.0047(ML) FM FRONT END 0.022 SW201 FM/SW R209 R210 BAND SELECTOR C222 R205 R208 ROD ANTENNA 150K 3.3/50 MIC/FM M FM DETECTION 220K 3.9K...
- Page 15 All manuals and user guides at all-guides.com WQ-740W/WQ-780W SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/ R531 FM MODE MIC/FM MONO SW403-A R565 R552 R344 R345 AL/FM STEREO 5.6K 4.7K 4.7K MIC2 R557 R346 GH/FM STEREO C533 C344 470K R556 C341 4.7/50 4.7/50 150K 4.7/50...
- Page 16 All manuals and user guides at all-guides.com WQ-740W/WQ-780W WQ-780W CNS2 TAPE 2 SW504 HEAD TAPE2 PLAYBACK SW502 FLEXIBLE PWB CNS1 DIRECTION HEAD (400-6) TAPE1 MAIN SW501 TAPE2 MAIN SW503 CNH107 TAPE2 PLAY RECORD/PLAYBACK ERASE HEAD(400-5) HEAD(400-4) TAPE 1 A B + -...
- Page 17 All manuals and user guides at all-guides.com WQ-740W/WQ-780W 1 2 3 4 CNH108 CNH109 MIC101 BUILT-IN MICROPHONE C347 R351 R350 L303 L304 SW302 RECORD/ 1 2 3 4 R333 PLAYBACK R343 C515 R330 CNS108 PALY REC. C353 C321 C352 R545...
- Page 18 All manuals and user guides at all-guides.com WQ-740W/WQ-780W WQ-780W FM SIGNAL GRAPHIC EQUALIZER VR102-A VR103-A VR104-A VR105-A X-BASS VR102-B VR103-B VR104-B VR105-B VR101-A 330Hz 1kHz 3.3kHz 10kHz VR101B R138 3.9K C176 R112 R118 R124 R130 R106 500P 8.2K 4.7K 3.3K...
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