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STR-W770

E Model

Australian Model

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

MICROFILM

STR-W770 is RECEIVER section in
MHC-W770AV.

SPECIFICATIONS

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range

87.5-108.0MHz

Aerial

FM lead aerial

Aerial terminals

75 ohm unbalanced

Intermediate frequency 10.7MHz

AM tuner section

Tuning range

(Thai,Australian,E)
AM: 530-1,710kHz

(with interval set at 10kHz)
531-1,710kHz
(with interval set at 9kHz)

(EXCEPT Thai,Australian,E)
MW: 531-1,602kHz

(with interval set at 9kHz)

(EXCEPT Thai,Australian,E)
SW: 5.95-17.90MHz

(with interval set at 9kHz)

Intermediate frequency 450kHz
Aerial

AM loop aerial,
External aerial terminal

Video  section

Inputs

AV INPUT VIDEO
(phone jack) :
1 Vp-p, 75 ohms
MONITOR OUT
(phone jack) :
1 Vp-p, 75 ohms

Amplifier section

DIN power output

80W +80W
(6 ohms at 1kHz, DIN)

Music power output

190W + 190W
(6 ohms at 1kHz, 10%, THD)

Inputs

MD/VIDEO 1 IN (phono jacks) : voltage 250 mV,
impedance 47 kilo ohms AV INPUT AUDIO
(phone jacks) : voltage 250 mV, impedance 47
kilo ohms
MIX/MIC (phone jack) :sensitivity 1mV,
impedance 10 kilo ohms

Outputs

MD/VIDEO 1 OUT
(phone jacks) : voltage 250
mV, impedance 1 kilo ohm
PHONES (stereo phone
 jack) : accepts headphone
of 8 ohms or more.
SPEAKER : accepts
impedance of 6 to 16
ohms
SUPER WOOFER :
Voltage 1 V, impedance 1
kilo ohms

— Continued on next page —

Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol 

a

  are

trademarks of Dolby Laboratories Licensing Corporation.

Summary of Contents for STR-W770

Page 1: ...ternal aerial terminal Video section Inputs AV INPUT VIDEO phone jack 1 Vp p 75 ohms MONITOR OUT phone jack 1 Vp p 75 ohms Amplifier section DIN power output 80W 80W 6 ohms at 1kHz DIN Music power output 190W 190W 6 ohms at 1kHz 10 THD Inputs MD VIDEO 1 IN phono jacks voltage 250 mV impedance 47 kilo ohms AV INPUT AUDIO phone jacks voltage 250 mV impedance 47 kilo ohms MIX MIC phone jack sensitivi...

Page 2: ...ECEIVER TABLE OF CONTENTS 1 GENERAL 3 2 TEST MODE 5 3 DIAGRAMS 6 3 1 Circuit Boards Location 6 3 2 Printed Wiring Board Panel Section 7 3 3 Schematic Diagram Panel Section 9 3 4 Printed Wiring Board Main Section 12 3 5 Schematic Diagram Main Section 15 3 6 Printed Wiring Board and Schematic Diagram Power Section 19 3 7 Printed Wiring Board and Schematic Diagram Mic Echo AV in Section 23 3 8 Printe...

Page 3: ...n MONO ST button FUNCTION button MIC LEVEL MIX MIC jack PHONES jack EDIT button ª PLAY MODE button º 1 ALL DISCS button REPEAT button HIGH FREQ button ENTER NEXT button MULTI JOG STATION dial LOW FREQ button MEMORY button TUNING MODE button FLASH button ª LOOP button º WAVE button AV INPUT jack CLOCK TIMER SET button TIMER SELECT button DOLBY PROLOGIC button MODE button DISPLAY button POWER button...

Page 4: ...EM CONTROL ª MD VIDEO jack º FRONT SPEAKER terminal SUPER WOOFER jack MONITOR OUT jack CENTER SPEAKER terminal REAR SPEAKER terminal VOLTAGE SELECTOR switch EXCEPT Thai Australian model ANTENNA terminal Photo E MODEL ª º ...

Page 5: ...oe xecutetheCDa ging setthethreediscstotheCDtra yand setthefunctiontoCD REPEA T ENTER NEXTandLOOP buttonssim ultaneousl y TheCDa gingmodestar tsandthedisc calendarstartsblinking 2 Tapea gingmode Toe xecutethetapea ging setthetw otapestothetapeAandB drives Setthefunctionto TAPE PresstheREPEA T ENTER NEXTandLOOPb uttonssim ultaneousl y PresstheAf orwar d keytostar tthetapea gingmode AGING appear son...

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Page 14: ... encoder input Volum encoder input JOG dial encoder input Not used 12C clock I O 12C data I O Not used Power supply 5V Power supply Ground Latch output to IC105 Latch output to IC2002 Mute output to transistor L Mute ON DBFB level control output L DBFB HIGH Latch output to IC6003 H Key con ON L SP relay ON Not used Key data input A D converter Key data input A D converter Key data input A D conver...

Page 15: ...O O O O O O O O O Description H MUTE L Signal Receiving Not used Pin Name FL 1G FL 2G FL 3G FL 4G FL 5G FL 6G FL 7G FL 8G FL 9G FL 10G FL 11G FL 12G FL 13G FL 14G FL P1 FL P2 FL P3 FL P4 FL P5 FL P6 FL P7 FL P8 FL P9 FL P10 FL P11 FL P12 FL P13 FL P14 FL P15 FL P16 FL P17 FL P18 FL P19 FL P20 FL P21 FL P22 FL P23 FL P24 FL P25 FL P26 FL P27 FL P28 FL P29 FL P30 FL P31 FL P32 FL P33 FL P34 ST MUTE ...

Page 16: ...A V CC L OUT R OUT S OUT C OUT ENABLE OSC1 CMODE CAP C TRIM DC CUT R BPF1 R BPF2 R BPF3 DC CUT DC CUT L R RECT L R RECT VCS TH VCS 1 VCS 2 BPF1 BPF2 VREF S CH DC OUT C CH DC OUT L CH DC OUT R CH DC OUT VREF L BPF1 L BPF2 L BPF3 DC CUT DC CUT R RECT L RECT VLR TH VLR 1 VLR 2 1 5 6 20 19 18 17 16 15 14 13 21 22 23 24 2 3 4 7 8 9 10 12 11 DEC IN FILTER 40kHz VDD ADM CONT SRAM ADM OUT FILTER 7k 5k B N...

Page 17: ... 77 76 75 74 73 72 71 65 66 67 68 69 70 KEY OUT1 NC3 REC 1A REC 1B REC 1C NC4 F1 F1 F1 O1 F1 IN1 F2 F1 F2 O1 F2 IN1 F3 F1 F3 O1 F3 IN1 F4 F1 F4 O1 F4 IN1 F5 F1 F OUT1 VOL OUT1 VOL IN1 BBIN1 BB11 BB12 BBIN2 VOL OUT2 VOL IN2 F OUT2 F5 F2 F4 IN2 F4 O2 F4 F2 F3 IN2 F3 O2 F3 F2 F2 IN2 F2 O2 F2 F2 F1 IN2 F1 O2 F1 F2 NC6 REC 2C REC 2B REC 2A NC7 KEY OUT2 BB22 BUF IN1 BUF OUT1 NC5 AVDD DGND LATCH DATA CLO...

Page 18: ...362 21 PANEL WH3 BACK HK 8 4 991 362 31 PANEL WH3 BACK AUS 8 4 991 362 41 PANEL WH3 BACK TH 8 4 991 362 51 PANEL WH3 BACK EA 9 A 4398 455 A MAIN BOARD COMPLETE EXCEPT AUS TH 9 A 4398 456 A MAIN BOARD COMPLETE AUS 9 A 4403 208 A MAIN BOARD COMPLETE TH 10 4 970 381 11 FOOT REAR 11 3 703 244 00 BUSHING 2104 CORD EXCEPT TH 11 3 703 571 11 BUSHING S 4516 CORD TH 12 1 690 608 11 CORD POWER AUS 12 1 751 ...

Page 19: ...IN BOARD 61 1 666 062 11 JOG BOARD 62 X 4948 611 1 BUTTON E N ASSY 63 4 984 085 01 SPRING ENTER COMPRESSION 64 A 4398 467 A PANEL BOARD COMPLETE EXCEPT AUS TH 64 A 4398 468 A PANEL BOARD COMPLETE AUS 64 A 4403 218 A PANEL BOARD COMPLETE TH 65 4 951 620 01 SCREW 2 6X8 BVTP 66 1 666 057 11 MIC ECHO BOARD FL501 1 517 618 11 INDICATOR TUBE FLUORESCENT 66 57 65 65 64 61 62 63 60 58 59 58 55 56 53 51 52...

Page 20: ... 126 967 11 ELECT 47uF 20 50V C956 1 136 495 11 FILM 0 068uF 5 50V C957 1 136 495 11 FILM 0 068uF 5 50V CONNECTOR CN902 1 564 524 11 PLUG CONNECTOR 9P DIODE D903 8 719 987 63 DIODE 1N4148M D953 8 719 987 63 DIODE 1N4148M IC IC901 8 749 921 04 IC STK 4211MK 2 TRANSISTOR Q901 8 729 900 80 TRANSISTOR DTC114ES Q902 8 729 140 84 TRANSISTOR 2SC1841 PAFAEA Q952 8 729 140 84 TRANSISTOR 2SC1841 PAFAEA RESI...

Page 21: ...uF 5 50V C112 1 126 964 11 ELECT 10uF 20 50V C113 1 126 963 11 ELECT 4 7uF 20 50V C114 1 136 167 00 FILM 0 15uF 5 50V TH C114 1 136 166 00 FILM 0 12uF 5 50V EXCEPT TH C115 1 136 167 00 FILM 0 15uF 5 50V TH C115 1 136 166 00 FILM 0 12uF 5 50V EXCEPT TH C116 1 126 961 11 ELECT 2 2uF 20 50V C117 1 162 306 11 CERAMIC 0 01uF 20 16V C118 1 126 964 11 ELECT 10uF 20 50V C120 1 126 959 11 ELECT 0 47uF 20 5...

Page 22: ... 1 136 167 00 FILM 0 15uF 5 50V C3032 1 126 962 11 ELECT 3 3uF 20 50V C3033 1 136 167 00 FILM 0 15uF 5 50V C3034 1 136 157 00 FILM 0 022uF 5 50V C3035 1 136 161 00 FILM 0 047uF 5 50V C3036 1 126 923 11 ELECT 220uF 20 10V C3037 1 126 964 11 ELECT 10uF 20 50V C3038 1 126 964 11 ELECT 10uF 20 50V C3039 1 126 964 11 ELECT 10uF 20 50V C3040 1 126 964 11 ELECT 10uF 20 50V C3041 1 126 923 11 ELECT 220uF ...

Page 23: ...ON 1 5K 5 1 4W F EXCEPT TH R110 1 249 433 11 CARBON 22K 5 1 4W R111 1 249 441 11 CARBON 100K 5 1 4W R112 1 249 421 11 CARBON 2 2K 5 1 4W F R113 1 249 435 11 CARBON 33K 5 1 4W R115 1 249 441 11 CARBON 100K 5 1 4W TH R115 1 249 439 11 CARBON 68K 5 1 4W EXCEPT TH R116 1 249 437 11 CARBON 47K 5 1 4W R117 1 247 903 00 CARBON 1M 5 1 4W R118 1 249 417 11 CARBON 1K 5 1 4W F R119 1 249 437 11 CARBON 47K 5 ...

Page 24: ... 1 249 429 11 CARBON 10K 5 1 4W R1002 1 249 429 11 CARBON 10K 5 1 4W R1020 1 249 425 11 CARBON 4 7K 5 1 4W F R1021 1 249 417 11 CARBON 1K 5 1 4W F R2001 1 249 417 11 CARBON 1K 5 1 4W F R2002 1 249 441 11 CARBON 100K 5 1 4W R2003 1 249 429 11 CARBON 10K 5 1 4W R2004 1 249 429 11 CARBON 10K 5 1 4W R2005 1 249 441 11 CARBON 100K 5 1 4W R2006 1 249 421 11 CARBON 2 2K 5 1 4W F R2007 1 249 425 11 CARBON...

Page 25: ...FILM 0 015uF 5 50V C521 1 124 463 00 ELECT 0 1uF 20 50V C522 1 164 159 11 CERAMIC 0 1uF 50V C523 1 162 302 11 CERAMIC 0 0022uF 30 16V C524 1 162 301 11 CERAMIC 0 0015uF 30 16V C525 1 162 288 31 CERAMIC 330PF 10 50V C526 1 164 159 11 CERAMIC 0 1uF 50V C527 1 164 159 11 CERAMIC 0 1uF 50V C528 1 104 905 11 CAPACITOR 0 22F 5 5V C544 1 162 306 11 CERAMIC 0 01uF 20 16V C545 1 162 306 11 CERAMIC 0 01uF 2...

Page 26: ...15K 5 1 4W R531 1 249 437 11 CARBON 47K 5 1 4W R532 1 249 409 11 CARBON 220 5 1 4W F R550 1 249 407 11 CARBON 150 5 1 4W F R551 1 249 407 11 CARBON 150 5 1 4W F R552 1 249 407 11 CARBON 150 5 1 4W F R553 1 249 407 11 CARBON 150 5 1 4W F R554 1 249 407 11 CARBON 150 5 1 4W F R555 1 249 401 11 CARBON 47 5 1 4W F R556 1 249 403 11 CARBON 68 5 1 4W F R557 1 249 399 11 CARBON 33 5 1 4W R557 1 249 401 1...

Page 27: ...21 1 762 751 11 SWITCH TACTILE GROOVE S522 1 762 751 11 SWITCH TACTILE FUNCTION S523 1 762 751 11 SWITCH TACTILE MONO ST S524 1 762 751 11 SWITCH TACTILE TUNER BAND S525 1 762 751 11 SWITCH TACTILE TIMER SELECT S526 1 762 751 11 SWITCH TACTILE CLOCK TIMER SET S527 1 762 751 11 SWITCH TACTILE DOLBY PRO LOGIC S528 1 762 751 11 SWITCH TACTILE MODE S531 1 762 751 11 SWITCH TACTILE KARAOKE PON S532 1 7...

Page 28: ... R4058 1 249 425 11 CARBON 4 7K 5 1 4W F R4059 1 249 425 11 CARBON 4 7K 5 1 4W F R4060 1 249 397 11 CARBON 22 5 1 4W F R4061 1 249 397 11 CARBON 22 5 1 4W F R4063 1 249 417 11 CARBON 1K 5 1 4W F R4064 1 249 431 11 CARBON 15K 5 1 4W R4065 1 249 441 11 CARBON 100K 5 1 4W R4070 1 208 602 11 WIREWOUND 0 22 10 2W F 1 666 071 11 SUR BOARD CAPACITOR C601 1 162 306 11 CERAMIC 0 01uF 20 16V CONNECTOR CN601...

Page 29: ...3 545 21 ENCAPSULATED COMPONENT AUS TH 6 1 233 546 21 ENCAPSULATED COMPONENT EXCEPT AUS TH 12 1 690 608 11 CORD POWER AUS 12 1 751 326 31 CORD POWER TH 12 1 777 071 21 CORD POWER EA HK MY SP 12 1 782 315 11 CORD POWER E 13 1 569 007 11 ADAPTOR CONVERSION 2P E 13 1 569 008 21 ADAPTOR CONVERSION 2P EA MY SP 13 1 770 019 11 ADAPTOR CONVERSION PLUG 3P HK M601 1 698 792 11 FAN DC T901 1 431 363 11 TRAN...

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