Table of Contents
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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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9FF24801600292
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
9FF26802125120
9FF26802125210
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
None
Used
Page
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Summary of Contents for Sharp WQ-740W
- Page 1 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...
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Page 2: Specifications
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; 2.3 - 7.3 MHz DC 15 V ["D"... -
Page 3: Names Of Parts
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 Built-in Microphone Surround Speaker Mixing Microphone Sockets Dubbing Speed/Built-in (TAPE 1) Record Button:... -
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: Tuner Section
• 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
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 SW2 BAND TC210 COVERAGE TC209 L205 TRACKING... -
Page 7: Front View
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 7.36V 6.52V 7.28V TAPE REC 6.5V Q106 0.69V... - Page 8 WQ-740W/WQ-780W WQ-740W R207 820K C220 IC201 470P LA1186N C212 C218 T202 0.022 0.0047(ML) FM FRONT END FM/SW R209 R210 C222 R205 R208 ROD ANTENNA 150K SW201 3.3/50 MIC/FM M FM DETECTION 220K 3.9K BAND SELECTOR C201 NORMAL/FM STE 0.001 HIGH/FM STE...
- Page 9 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 5.6K 4.7K MIC2 R346 H/FM STEREO C344 C533 R556 470K C341 4.7/50 4.7/50 150K 4.7/50 Q303 Q302 9014 C 9014 C VR301 MIC AMP.
- Page 10 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 TAPE MECHANISM CN207 1 2 3 4 5 6 7...
- Page 11 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 R553 R344 R552 CNS107 R555 R558 T1.25A L 250V...
- Page 12 WQ-740W/WQ-780W WQ-740W FM SIGNAL GRAPHIC EQUALIZER VR104-A VR102-A VR103-A VR105-A VR104-B X-BASS VR102-B VR103-B VR105-B VR101-A 330Hz 1kHz 3.3kHz 10kHz VR101-B R138 3.9K C176 R130 R106 R112 R118 500P 8.2K 4.7K R136 680K C102 C103 470/16 R101 R103 C126 1/50...
- Page 13 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) POWER D503 TRANSFORMER ORANGE C503 YELLOW...
- Page 14 WQ-740W/WQ-780W WQ-780W R207 820K IC201 C220 470P LA1186N C212 C218 T202 0.022 0.0047(ML) FM FRONT END SW201 FM/SW R209 R210 C222 BAND SELECTOR R205 R208 ROD ANTENNA 150K 3.3/50 MIC/FM M 220K FM DETECTION 3.9K C201 NORMAL/FM ST 0.001 HIGH/FM ST...
- Page 15 WQ-740W/WQ-780W SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/ R531 FM MODE MIC/FM MONO SW403-A R565 R552 R344 AL/FM STEREO R345 5.6K 4.7K MIC2 4.7K R557 R346 GH/FM STEREO C533 C344 470K R556 C341 4.7/50 4.7/50 150K 4.7/50 Q303 R211 VR301 9014 C 50K(B) MIC AMP.
- Page 16 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 + - M501 TAPE MOTOR TAPE MECHANISM...
- Page 17 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. C353 C321 C352 R545 R553 R344 R552 CNS107 R555 R558 T1.25A L 250V...
- Page 18 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 C102 R136 C114 680K 100P C103 470/16...