Sony STR-DB725 Service Manual Download

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MICROFILM

AEP Model

UK Model

SPECIFICATIONS

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

STR-DB725/DB825

— Continued on next page —

Photo: STR-DB825

Summary of Contents for STR-DB725

Page 1: ... 1 MICROFILM AEP Model UK Model SPECIFICATIONS SERVICE MANUAL FM STEREO FM AM RECEIVER STR DB725 DB825 Continued on next page Photo STR DB825 ...

Page 2: ... 3 5 Schematic Diagram Input Section 17 3 6 Printed Wiring Board Input Section 19 3 7 Schematic Diagram S Video Section 21 3 8 Printed Wiring Board S Video Section 23 3 9 Schematic Diagram Speaker Section 25 3 10 Printed Wiring Board Speaker Section 27 3 11 Printed Wiring Board Display Section 29 3 12 Schematic Diagram Display Section 31 3 13 Schematic Diagram Front Panel Section 33 3 14 Printed W...

Page 3: ...e power The whole fluorescent display tube lights up The fluorescent display tube and LED light up in the following sequence each time the FUNCTION knob is rotated KEY CHECK Mode for checking key input Procedure Turn on the power by pressing the 1 u button while pressing the button and the BASS BOOST button REST 25 KEY is displayed The count decreases each time the button is pressed Buttons counte...

Page 4: ...on 21 SOUND FIELD MODE button 22 SOUND FIELD GENRE button 23 BASS BOOST button 24 TONE ON OFF button 25 5 1 DVD INPUT button 26 BASS TREBLE indicator 27 INDEX indicator 28 SET UP button 29 Digital Processing Controls 30 CURSOR MODE button 31 RDS EON button 32 RDS PTY button 33 VIDEO 3 INPUT AUDIO R connecot 34 VIDEO 3 INPUT AUDIO L connecot 35 VIDEO 3 INPUT VIDEO connecot 36 VIDEO 3 INPUT S VIDEO ...

Page 5: ...LOCATION SURR board S VIDEO board STANDBY 2 board DISPLAY board AMP board INPUT board SP board CONNECTOR board H P board STANDBY board BALANCE board VIDEO board FUNCTION board SW board VIDEO 3 board SP SWITCH board VOLUME board REAR AMP board ...

Page 6: ... 3 6 5 BASS TREBLE TONE CONTROL IC502 LEVEL SHIFT STB 10 CLK 8 DI 9 T LAT S CLK S DATA BOOST DET Q501 502 Q414 5V RY301 RELAY DRIVE Q308 RV401 VOLUME RV402 BALANCE L C W SL A POWER SECTION M UP DOWN V A 2 SYSTEM CONTROL IC103 1 2 V B 3 V E 4 V INH 27 09 21 AUTO STOP 23 STEREO 22 TUNER MUTE RDS DATA RDS CLK S DATA S CLK S LAT DO AUTO STOP STEREO TMUTE 19 S DATA 18 15 38 S CLOCK 20 S LATCH 9 D LATCH...

Page 7: ... F802 D802 805 B B IMPEDANCE SELECTOR 8 4 S501 F901 F903 D901 904 DB825 CNJ909 CNP901 AC IN L R FM CD B MAIN SECTION Signal Path RCH is omitted IN W 6 14 VCC 2 VE 3 VE 1 18V REG IC702 3 T901 F803 F804 1 15V REG 3 3 5V REG 1 REG Q801 IC809 24V 24V 30V 3 15V REG 1 IC809 IC801 3 12V REG 1 IC451 3 5V REG 1 IC450 15V 12V 5V IC803 15V T902 SYSTEM CONTROL MODE CONTROL IC103 2 2 P RY A MAIN SECTION 8 AC M...

Page 8: ... MΩ Voltage variations may be noted due to normal produc tion tolerances Waveforms are taken with a oscilloscope Voltage variations may be noted due to normal produc tion tolerances Circled numbers refer to waveforms Signal path F FM L AUDIO g VIDEO i SURROUND d PB TAPE MD G REC TAPE MD p Y l CHROMA J CD I PHONO For printed wiring boards Note X parts extracted from the component side Y parts extra...

Page 9: ... 13 14 STR DB725 DB825 3 3 SCHEMATIC DIAGRAM VIDEO INPUT SECTION See page 43 for IC Block Diagrams Page 21 Page 32 Page 17 Page 21 ...

Page 10: ... 15 16 STR DB725 DB825 3 4 PRINTED WIRING BOARD VIDEO INPUT SECTION See page 5 for Circuit Boards Location Page 30 Page 23 Page 23 Page 19 ...

Page 11: ... 17 18 STR DB725 DB825 3 5 SCHEMATIC DIAGRAM INPUT SECTION See page 43 for IC Block Diagrams Page 32 Page 14 Page 37 Page 31 32 Page 33 Page 26 Page 25 Page 37 Page 22 Page 22 Page 21 22 ...

Page 12: ... 7 IC301 D 5 IC302 B 2 IC303 C 2 IC304 E 8 IC305 E 7 IC306 D 10 IC450 B 11 IC451 B 10 IC452 F 1 IC502 D 11 IC601 B 7 IC701 B 5 IC801 B 9 IC803 B 10 Q300 F 8 Q301 E 8 Q302 E 6 Q303 E 5 Q304 E 6 Q305 D 6 Q411 F 7 Q414 E 11 Q501 C 10 Q502 B 10 Q551 E 10 Q552 E 11 Q691 B 8 Q692 B 8 Q3008 D 6 Page 15 Page 39 Page 27 Page 27 Page 40 Page 35 Page 24 Page 30 Page 30 Page 24 Page 24 ...

Page 13: ... 21 22 STR DB725 DB825 3 7 SCHEMATIC DIAGRAM S VIDEO SECTION See page 43 for IC Block Diagrams Page 14 Page 14 Page 18 Page 18 Page 18 ...

Page 14: ... 23 24 STR DB725 DB825 3 8 PRINTED WIRING BOARD S VIDEO SECTION See page 5 for Circuit Boards Location Page 19 Page 19 Page 19 Page 15 Page 15 ...

Page 15: ... 25 26 3 9 SCHEMATIC DIAGRAM SPEAKER SECTION See page 43 for IC Block Diagrams STR DB725 DB825 Page 38 Page 37 Page 37 Page 31 Page 41 Page 38 Page 31 Page 18 Page 18 ...

Page 16: ... 27 28 3 10 PRINTED WIRING BOARD SPEAKER SECTION See page 5 for Circuit Boards Location STR DB725 DB825 Page 29 Page 19 Page 39 Page 39 Page 42 Page 29 Page 40 Page 19 Page 39 ...

Page 17: ...102 C 2 D103 C 2 D104 C 2 D105 C 2 D106 D 2 D107 D 10 D108 E 10 D111 C 10 D117 C 11 D119 D 2 D120 D 2 D121 E 2 D124 D 9 D125 D 3 D126 D 10 D127 D 7 D128 D 6 D129 D 4 D130 D 8 D131 D 5 D135 C 10 D136 C 10 D151 E 3 D152 E 3 D153 E 4 D154 E 4 D184 D 11 D1101 C 2 IC101 C 10 IC102 B 3 IC103 C 7 IC106 D 11 IC107 B 2 Q101 E 2 Q102 E 2 Q103 D 10 Q104 D 10 Q105 C 10 Q106 C 1 Q107 C 3 Q108 C 11 Q129 C 2 Q13...

Page 18: ... 31 32 3 12 SCHEMATIC DIAGRAM DISPLAY SECTION See page 11 for Waveforms See page 46 for IC Pin Function STR DB725 DB825 Page 34 Page 26 Page 38 Page 26 Page 17 18 Page 14 Page 17 Page 34 Page 34 Page 33 ...

Page 19: ... 33 34 3 13 SCHEMATIC DIAGRAM FRONT PANEL SECTION STR DB725 DB825 Page 32 Page 32 Page 32 Page 31 Page 18 ...

Page 20: ... 35 36 3 14 PRINTED WIRING BOARD FRONT PANEL SECTION See page 5 for Circuit Boards Location STR DB725 DB825 Page 29 Page 30 Page 20 Page 29 Page 30 ...

Page 21: ... 37 38 3 15 SCHEMATIC DIAGRAM POWER AMP SECTION STR DB725 DB825 Page 25 Page 41 Page 41 Page 26 Page 31 Page 25 Page 17 Page 18 Page 25 ...

Page 22: ... 2 D547 C 10 D548 C 10 D549 C 10 D551 D 10 D552 D 10 D553 D 10 D554 D 10 D555 B 3 D556 A 3 D601 D 7 D602 D 7 D603 D 7 D604 D 7 D608 A 10 D801 B 7 D802 C 8 D803 C 8 D804 C 8 D805 C 8 D806 A 9 D807 C 6 IC809 B 10 Q504 D 5 Q505 D 5 Q506 D 4 Q507 D 5 Q508 D 6 Q509 B 3 Q510 A 2 Q511 A 3 Q546 A 9 Q547 C 10 Q548 C 10 Q549 C 10 Q554 D 10 Q555 D 10 Q556 D 9 Q557 D 10 Q558 D 11 Q559 B 3 Q560 A 3 Q561 A 3 Q5...

Page 23: ... 41 3 17 SCHEMATIC DIAGRAM TRANS SECTION STR DB725 DB825 Page 38 Page 38 Page 26 ...

Page 24: ... 42 3 18 PRINTED WIRING BOARD TRANS SECTION See page 5 for Circuit Boards Location Page 28 Page 40 Page 40 ...

Page 25: ... 9 NC OUTPUT 2 Vcc GND NC INPUT 2 INPUT 1 NC MOTOR DRIVE MOTOR DRIVE REG SWITCH SWITCH OUTPUT1 IC251 NJM2296D 9 S5 S6 S7 S4 S1 S2 S3 Vout1 Vout2 Vout3 V GND SW3 SW2 SW1 SW5 SW4 Vin1 Vin2 Vin3 Vin4 Vin5 V 10 11 12 13 14 15 16 1 5 2 3 4 6 7 8 IC302 LC7822 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 CONTROL LATCH SHIFT RESISTOR LEVEL SHIFT CL DI CE VEE OUT IN OUT ...

Page 26: ... FCC IN2 ENABLE DATA CLK OSC1 NS BPF1 NS BPF2 VREF S DCUT C DCUT L DCUT R DCUT VREF BUF L IN R IN GND CT OUT1 CT IN1 FCC IN1 L BRF1 L BRF2 L BRF3 DCUT DCUT R RCT VCR TH VCR1 VCR2 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 L R RECT 27 26 25 P S VCS LOG OSC DEC N GEN N BPF N OH DIV BAL DET BALCONT VREF VR VR VCRX8 COMB NET CMODE SMUTE C TRIM P B P B P B P B R B R B R B P F L B P F L...

Page 27: ...LOGIC AND OUTPUT SELECTOR SWITCH RECONSTRUCTION FILTER 14 15 16 13 12 11 10 9 3 2 1 4 5 6 7 8 CLOCK REGENERATION AND SYNC VP1 RDCL TS7 OSCO OSCI V DDD V SSD TEST TSTLD QUAL RDDA Vref MUX V DDA V SSA CIN SCOUT IC502 TC9184P 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 S DATA T LAT 9V 9V GND S CLK TONE CE BASS BASS COM TREBLE TREBLE BASS BASS COM TREBLE TREBLE 1 2 3 4 5 6 7 8 V VSB SESIN VSA RESET GND OUT...

Page 28: ...uto stop Tuner mute Stereo Tuner data in A D ground 0 V SIRCS input Video IC SW4 S LINK CONTROL A1 latch Version A D key 4 A D key 3 A D key 2 A D key 1 A D power supply 5 V A D reference voltage 5 V S LINK CONTROL A1 data output S LINK CONTROL A1 data input RDS clock input STOP Ground VDD 5V V A V B V E S MUTE S MUTE AC MUTE D LATCH RESET X2 X1 VSS GND NP RDS DAT IN VDD 5V T LATCH S CLOCK S DATA ...

Page 29: ...pass LED Muting LED Tone LED Surround LED Index LED PHONO LED TUNER LED CD LED TAPE MD LED TV LD LED VIDEO 3 LED VIDEO 2 LED VIDEO 1 LED FL segment signal output FIP pull down 35 V FL segment signal output FL gride signal output DIRECT PASS SUR RY CENTER RY FRONT RY MIX SUB RY VDD 5V PROTECTOR IN POWER RY BASS BOOST SP OFF VOL VOL RE A RE B VOL LED POWER KEY 5 1 INPUT LED DIRECT PASS LED MUTING LE...

Page 30: ...ecified 9 4 900 493 11 PANEL BACK DB825 10 1 769 941 11 WIRE FLAT TYPE 11 CORE 11 1 769 908 11 WIRE FLAT TYPE 9 CORE 12 4 924 098 31 HOLDER PC BOARD 13 3 703 244 00 BUSHING 2104 CORD 14 1 769 744 11 CORD POWER 15 X 4949 523 1 FOOT ASSY F50180S 16 4 970 124 01 CUSHION F50180S 17 A 4407 575 A SURR BOARD COMPLETE CNJ909 1 526 794 11 OUTLET AC AC OUTLET 1 4 210 291 01 SCREW TAPPING 2 4 900 512 01 CASE...

Page 31: ...NS LED 80 4 921 941 01 CUSHION FL 81 3 386 245 11 HOLDER FL FL101 1 517 770 11 INDICATOR TUBE FLUORESCENT 51 4 900 570 11 ESCUTCHEON A LID 52 4 900 492 01 KNOB LID 53 4 900 569 01 ESCUTCHEON M LID 54 4 900 579 01 COVER STI 55 X 4948 601 1 KNOB FUNC ASSY 56 X 3375 592 1 KNOB VOL ASSY 57 4 900 568 11 PANEL FRONT DB725 57 4 900 568 21 PANEL FRONT DB825 58 4 900 566 11 WINDOW 59 4 900 572 01 FULCRUM L...

Page 32: ...4 1 670 096 11 BALANCE BOARD 105 1 670 098 11 VOLUME BOARD 106 1 773 110 11 WIRE FLAT TYPE 19 CORE 107 A 4414 176 A INPUT BOARD COMPLETE 109 1 773 008 11 WIRE FLAT TYPE 15 CORE 140mm 110 3 905 609 11 SCREW TRANSISTOR 111 A 4414 843 A REAR AMP BOARD COMPLETE 112 1 669 449 11 STANDBY BOARD 113 A 4407 589 A STANDBY 2 BOARD COMPLETE 114 A 4414 175 A AMP BOARD COMPLETE DB825 114 A 4417 193 A AMP BOARD ...

Page 33: ...803 1 117 950 11 ELECT 10000uF 20 63V C804 1 117 950 11 ELECT 10000uF 20 63V C805 1 130 781 00 FILM 0 22uF 10 100V C806 1 130 781 00 FILM 0 22uF 10 100V C811 1 126 952 11 ELECT 1000uF 20 35V C812 1 126 951 11 ELECT 470uF 20 35V C813 1 126 967 11 ELECT 47uF 20 50V C817 1 126 967 11 ELECT 47uF 20 50V C818 1 126 967 11 ELECT 47uF 20 50V CC48 1 136 153 00 CERAMIC 5 50V CC49 1 136 153 00 CERAMIC 5 50V ...

Page 34: ...7 11 CARBON 47K 5 1 4W R533 1 249 393 11 CARBON 10 5 1 4W F R534 1 249 389 11 CARBON 4 7 5 1 4W F R535 1 249 431 11 CARBON 15K 5 1 4W R539 1 249 427 11 CARBON 6 8K 5 1 4W F R540 1 249 417 11 CARBON 1K 5 1 4W F R542 1 249 429 11 CARBON 10K 5 1 4W R547 1 249 425 11 CARBON 4 7K 5 1 4W F R548 1 249 429 11 CARBON 10K 5 1 4W R549 1 249 393 11 CARBON 10 5 1 4W F R551 1 247 881 00 CARBON 120K 5 1 4W R552 ...

Page 35: ...ND104 1 564 501 11 PIN CONNECTOR 8P CNE102 1 564 519 11 PLUG CONNECTOR 4P CNP103 1 770 553 11 CONNECTOR BOARD TO BOARD 11P CNP107 1 779 365 11 CONNECTOR PC BOARD PLUG 8P CNP119 1 770 553 11 CONNECTOR BOARD TO BOARD 11P CNS102 1 770 397 11 HOUSING CONNECTOR PC BOARD 4P CNS116 1 568 856 11 SOCKET CONNECTOR 13P CNS117 1 568 858 11 SOCKET CONNECTOR 15P DIODE D101 8 719 059 14 DIODE SID313BP TP19 DB825...

Page 36: ...W R142 1 247 807 31 CARBON 100 5 1 4W R143 1 247 807 31 CARBON 100 5 1 4W R144 1 247 807 31 CARBON 100 5 1 4W R146 1 249 383 11 CARBON 1 5 5 1 6W F DB825 R148 1 249 425 11 CARBON 4 7K 5 1 4W F DB825 R150 1 249 409 11 CARBON 220 5 1 4W R152 1 249 411 11 CARBON 330 5 1 4W R153 1 249 411 11 CARBON 330 5 1 4W R154 1 249 411 11 CARBON 330 5 1 4W R155 1 249 429 11 CARBON 10K 5 1 4W R156 1 249 421 11 CAR...

Page 37: ...934 11 ELECT 220uF 20 10V C309 1 126 934 11 ELECT 220uF 20 10V C310 1 125 896 91 MYLAR 0 0091uF 5 50V C311 1 125 896 91 MYLAR 0 0091uF 5 50V C312 1 136 159 00 FILM 0 033uF 5 50V C313 1 136 159 00 FILM 0 033uF 5 50V C314 1 126 961 11 ELECT 2 2uF 20 50V C315 1 126 961 11 ELECT 2 2uF 20 50V C316 1 126 933 11 ELECT 100uF 20 16V C317 1 126 933 11 ELECT 100uF 20 16V C318 1 104 664 11 ELECT 47uF 20 16V C...

Page 38: ...7 584 11 CERAMIC 4PF 0 25PF 500V C755 1 126 934 11 ELECT 220uF 20 10V C756 1 162 282 31 CERAMIC 100PF 10 50V C807 1 126 934 11 ELECT 220uF 20 16V C808 1 126 934 11 ELECT 220uF 20 16V C809 1 126 948 11 ELECT 100uF 20 35V C1000 1 161 494 11 CERAMIC 0 022uF 30 25V C5001 1 126 966 11 ELECT 33uF 20 50V C5051 1 126 966 11 ELECT 33uF 20 50V CC01 1 162 282 31 CERAMIC 100PF 10 50V CC02 1 162 286 31 CERAMIC...

Page 39: ...0 5 1 4W R358 1 247 807 31 CARBON 100 5 1 4W R359 1 249 417 11 CARBON 1K 5 1 4W F R360 1 249 441 11 CARBON 100K 5 1 4W R361 1 249 441 11 CARBON 100K 5 1 4W R362 1 249 417 11 CARBON 1K 5 1 4W F R363 1 249 417 11 CARBON 1K 5 1 4W F R364 1 249 429 11 CARBON 10K 5 1 4W R365 1 249 429 11 CARBON 10K 5 1 4W R366 1 249 429 11 CARBON 10K 5 1 4W R367 1 249 417 11 CARBON 1K 5 1 4W F R368 1 249 441 11 CARBON ...

Page 40: ...08 1 249 425 11 CARBON 4 7K 5 1 4W F R3009 1 249 441 11 CARBON 100K 5 1 4W R3010 1 247 852 11 CARBON 7 5K 5 1 4W R3011 1 249 413 11 CARBON 470 5 1 4W F R3012 1 249 429 11 CARBON 10K 5 1 4W R3013 1 249 429 11 CARBON 10K 5 1 4W R3014 1 249 429 11 CARBON 10K 5 1 4W R3060 1 247 852 11 CARBON 7 5K 5 1 4W R3062 1 249 429 11 CARBON 10K 5 1 4W R3063 1 249 429 11 CARBON 10K 5 1 4W R3368 1 247 903 00 CARBON...

Page 41: ...52 8 719 911 19 DIODE 1SS119 25 IC IC251 8 759 529 20 IC NJM2296D IC252 8 759 529 20 IC NJM2296D JACK J251 1 537 943 11 TERMINAL S MONITOR S VIDEO OUT J252 1 764 676 11 CONNECTOR ROUND TYPE VIDEO 1 S VIDEO OUT IN J253 1 537 943 11 TERMINAL S TV LD S VIDEO IN RESISTOR R251 1 249 403 11 CARBON 68 5 1 4W F R252 1 249 429 11 CARBON 10K 5 1 4W R253 1 249 403 11 CARBON 68 5 1 4W F R254 1 249 403 11 CARB...

Page 42: ...RBON 4 7K 5 1 4W F R749 1 249 393 11 CARBON 10 5 1 4W F R784 1 249 389 11 CARBON 4 7 5 1 4W F R787 1 249 429 11 CARBON 10K 5 1 4W R788 1 247 887 00 CARBON 220K 5 1 4W RELAY RY503 1 515 793 11 RELAY RY601 1 515 920 11 RELAY 24V RY701 1 515 920 11 RELAY 24V RY901 1 515 999 11 RELAY POWER TRANSFORMER T902 1 450 358 11 TRANSFORMER POWER 1 670 101 11 SP SWITCH BOARD CONNECTOR CNS104 1 770 404 11 HOUSIN...

Page 43: ...5 00 FILM 0 1uF 5 50V C402 1 102 852 91 CERAMIC 47PF 5 50V C403 1 130 469 00 MYLAR 680PF 5 50V C404 1 136 157 00 FILM 0 022uF 5 50V C405 1 102 973 00 CERAMIC 100PF 5 50V C406 1 102 953 00 CERAMIC 18PF 5 50V C407 1 136 161 00 FILM 0 047uF 5 50V C408 1 126 925 11 ELECT 470uF 20 10V C409 1 124 261 00 ELECT 10uF 20 50V C410 1 126 925 11 ELECT 470uF 20 10V C411 1 124 261 00 ELECT 10uF 20 50V C412 1 136...

Page 44: ... 11 CARBON 22 5 1 4W F R322 1 249 417 11 CARBON 1K 5 1 4W F R323 1 249 397 11 CARBON 22 5 1 4W F R400 1 249 441 11 CARBON 100K 5 1 4W R401 1 249 436 11 CARBON 39K 5 1 4W R402 1 249 425 11 CARBON 4 7K 5 1 4W F R403 1 249 417 11 CARBON 1K 5 1 4W F R451 1 249 435 11 CARBON 33K 5 1 4W R458 1 249 436 11 CARBON 39K 5 1 4W 1 670 095 11 SW BOARD CONNECTOR CNS107 1 695 808 11 CONNECTOR PC BOARD 8P DIODE D1...

Page 45: ... AC AC OUTLET FL101 1 517 770 11 INDICATOR TUBE FLUORESCENT VOLUME S122 1 762 751 11 SWITCH TACTILE SOUND FIELD ON OFF 1 670 097 11 VIDEO BOARD CAPACITOR C201 1 126 964 11 ELECT 10uF 20 50V C202 1 126 964 11 ELECT 10uF 20 50V C203 1 126 964 11 ELECT 10uF 20 50V C204 1 126 964 11 ELECT 10uF 20 50V C205 1 162 215 31 CERAMIC 47PF 5 50V C206 1 162 215 31 CERAMIC 47PF 5 50V C207 1 162 215 31 CERAMIC 47...

Page 46: ...MATERIALS 1 475 726 11 REMOTE COMMANDER RM LJ301 DB825 1 501 374 11 ANTENNA LOOP 3 810 765 21 MANUAL COMMONNESS INSTRUCTION FOR CONTROL A1 ENGLISH FRENCH GERMAN SPANISH DUTCH SWEDISH ITALIAN PORTUGUESE CHINESE DB825 3 864 029 61 MANUAL INSTRUCTION ENGLISH FRENCH DUTCH SWEDISH 3 864 029 71 MANUAL INSTRUCTION GERMAN SPANISH ITALIAN PORTUGUESE 3 864 230 11 MANUAL INSTRUCTION RM PP401 ENGLISH DB725 3 ...

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Sony STR-DB725, Service Manual

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