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Sony STR-DB725 Service Manual
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Sony STR-DB725 Service Manual

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STR-DB725/DB825
SERVICE MANUAL
AEP Model
UK Model
Photo: STR-DB825
SPECIFICATIONS
— Continued on next page —
FM STEREO/FM-AM RECEIVER
MICROFILM
– 1 –

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Summary of Contents for Sony STR-DB725

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

  • Page 2: Table Of Contents

    WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. MODEL IDENTIFICATION — BACK PANEL — Parts No.

  • Page 3: Servicing Note

    SECTION 1 SERVICING NOTE FACTORY SET Mode which sets the preset settings of the unit to that at shipment. Procedure: While pressing the < button and BASS BOOST button together, press the 1/u button to turn on the power. “FACTORY” will be displayed and factory settings executed. INITIALIZATION Mode which erases all the preset settings of the unit.

  • Page 4: General

    SECTION 2 GENERAL Front Panel Descriptions 10 11 13 14 LOCATION OF PARTS AND CONTROLS 1 1/u (power) switch 23 BASS BOOST button 2 DISPLAY button 24 TONE ON/OFF button 3 FM/AM button 25 5.1/DVD INPUT button 4 VIDEO 1 indicator 26 BASS/TREBLE indicator 5 VIDEO 2 indicator 27 INDEX indicator...

  • Page 5: Diagrams

    SECTION 3 DIAGRAMS 3-1. CIRCUIT BOARDS LOCATION SP board S VIDEO board H.P board VIDEO board VIDEO (3) board SURR board BALANCE board VOLUME board STANDBY board STANDBY (2) board AMP board REAR AMP board DISPLAY board CONNECTOR board SP SWITCH board INPUT board SW board...

  • Page 6: Block Diagrams

    STR-DB725/DB825 3-2. BLOCK DIAGRAMS – MAIN SECTION – DOLBY PROLOGIC SURROUND TUNER UNIT IS SUPPLIED AS THE ASSEMBLED BLOCK AUDIO SELECT MATRIX DECODER PROCESSOR SELECTOR IC302 IC401 IC400 IC403 LINE AMP L.P.F TUNER UNIT IC404 L OUT L OUT IC306...

  • Page 7: Power Section

    STR-DB725/DB825 – POWER SECTION – POWER AMP(L) IC601 J701 R CH 13 VCC PHONES RY602 BOOSTER RELAY Q506 –B DRIVE LIMITER Q601 Q504 S155 • RCH is omitted LIMITER Q511 SPEAKERS Q505 • Signal Path PROTECTOR Q509,510 TM501 BOOSTER CUR DET –VE...
  • Page 8 WAVEFORMS THIS NOTE IS COMMON FOR PRINTED WIRING – DISPLAY SECTION – BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) 3.8Vp-p For schematic diagrams. Note: 7.28MHz • All capacitors are in µF unless otherwise noted. pF: µµF IC102 !§...

  • Page 9: Schematic Diagram - Video Input Section

    STR-DB725/DB825 3-3. SCHEMATIC DIAGRAM – VIDEO INPUT SECTION – • See page 43 for IC Block Diagrams. (Page 21) (Page 32) (Page 21) (Page 17) – 13 – – 14 –...

  • Page 10: Printed Wiring Board - Video Input Section

    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) – 15 – – 16 –...

  • Page 11: Schematic Diagram - Input Section

    STR-DB725/DB825 3-5. SCHEMATIC DIAGRAM – INPUT SECTION – • See page 43 for IC Block Diagrams. (Page 22) (Page 21, (Page 22) (Page (Page (Page (Page 32) (Page (Page (Page 33) (Page 31, 32) – 18 – – 17 –...

  • Page 12: Printed Wiring Board - Input Section

    STR-DB725/DB825 3-6. PRINTED WIRING BOARD – INPUT SECTION – • See page 5 for Circuit Boards Location. (Page 27) • Semiconductor (Page 39) (Page 15) (Page 27) Location Ref. No. Location D301 D401 D402 E-10 IC001 IC301 IC302 IC303 IC304...

  • Page 13: Schematic Diagram - S-Video Section

    STR-DB725/DB825 3-7. SCHEMATIC DIAGRAM – S-VIDEO SECTION – • See page 43 for IC Block Diagrams. (Page 18) (Page 18) (Page 18) (Page 14) (Page 14) – 22 – – 21 –...

  • Page 14: Printed Wiring Board - S-Video Section

    STR-DB725/DB825 3-8. PRINTED WIRING BOARD – S-VIDEO SECTION – • See page 5 for Circuit Boards Location. (Page 15) (Page 15) (Page 19) (Page 19) (Page 19) – 23 – – 24 –...

  • Page 15: Schematic Diagram - Speaker Section

    STR-DB725/DB825 3-9. SCHEMATIC DIAGRAM – SPEAKER SECTION – • See page 43 for IC Block Diagrams. (Page 18) (Page 31) (Page 38) (Page 38) (Page 18) (Page 41) (Page 31) (Page 37) (Page 37) – 25 – – 26 –...

  • Page 16: Printed Wiring Board - Speaker Section

    STR-DB725/DB825 3-10. PRINTED WIRING BOARD – SPEAKER SECTION – • See page 5 for Circuit Boards Location. (Page 19) (Page 39) (Page 39) (Page 29) (Page 19) (Page 39) (Page 42) (Page 40) (Page 29) – 27 – – 28 –...

  • Page 17: Printed Wiring Board - Display Section

    STR-DB725/DB825 3-11. PRINTED WIRING BOARD – DISPLAY SECTION – • Semiconductor • See page 5 for Circuit Boards Location. Location Ref. No. Location D101 D102 D103 D104 D105 D106 D107 D-10 D108 E-10 D111 C-10 D117 C-11 D119 D120 D121...

  • Page 18: Schematic Diagram - Display Section

    STR-DB725/DB825 3-12. SCHEMATIC DIAGRAM – DISPLAY SECTION – • See page 11 for Waveforms. • See page 46 for IC Pin Function. (Page (Page (Page (Page (Page 14) (Page 17) (Page (Page (Page (Page 17,18) – 31 – – 32 –...

  • Page 19: Schematic Diagram - Front Panel Section

    STR-DB725/DB825 3-13. SCHEMATIC DIAGRAM – FRONT PANEL SECTION – (Page 32) (Page 32) (Page 32) (Page 31) (Page 18) – 34 – – 33 –...

  • Page 20: Printed Wiring Board - Front Panel Section

    STR-DB725/DB825 3-14. PRINTED WIRING BOARD – FRONT PANEL SECTION – • See page 5 for Circuit Boards Location. (Page 29) (Page 30) (Page 29) (Page 30) (Page 20) – 35 – – 36 –...

  • Page 21: Schematic Diagram - Power Amp Section

    STR-DB725/DB825 3-15. SCHEMATIC DIAGRAM – POWER AMP SECTION – (Page 25) (Page (Page 25) (Page 41) (Page 17) (Page 41) (Page 25) (Page 26) (Page 31) – 38 – – 37 –...

  • Page 22: Printed Wiring Board - Power Amp Section

    STR-DB725/DB825 3-16. PRINTED WIRING BOARD – POWER AMP SECTION – • See page 5 for Circuit Boards Location. • Semiconductor (Page 27) (Page 27) (Page 42) (Page 27) (Page 42) Location Ref. No. Location D501 D502 D503 D504 D505 D506...

  • Page 23: Schematic Diagram - Trans Section

    STR-DB725/DB825 3-17. SCHEMATIC DIAGRAM – TRANS SECTION – (Page 38) (Page 38) (Page 26) – 41 –...

  • Page 24: Printed Wiring Board - Trans Section

    3-18. PRINTED WIRING BOARD – TRANS SECTION – • See page 5 for Circuit Boards Location. (Page 40) (Page 40) (Page 28) – 42 –...

  • Page 25: Ic Block Diagrams

    3-19. IC BLOCK DIAGRAMS IC001, 601, 701 uPC2581V BIAS CIRCUIT PROTECTOR DRIVE DRIVE DRIVE DRIVE IC106 BA6208 MOTOR SWITCH DRIVE MOTOR SWITCH DRIVE IC251 NJM2296D Vout2 Vin1 Vout3 Vin2 Vout1 Vin5 Vin4 Vin3 IC302 LC7822 IN IN LEVEL SHIFT LATCH RESET SHIFT RESISTOR –...
  • Page 26 IC400 CXA8081S AGND PDM-COUT SRA1-8K INV-PHASE R+DELAY L+DELAY 5K/7K-L.P.F. VOL/MUTE 20KH-L.P.F. B-NR -6dB RS-TRIM R-STEREO LS-TRIM VREF 17 18 IC401 CXA8079S 47 46 45 44 43 30 29 28 C-TRIM R-B.P.F. L+R-RECT VCS-LOG N-GEN N-BPF BAL-DET L-R-RECT DUAL-TIME CMODE SMUTE N-OH BALCONT R-RECT...
  • Page 27 IC452 BU1922 TEST LOGIC AND OUTPUT SELECTOR SWITCH 57kHz OSCILLATOR ANTI- QUALITY BIT RECONSTRUCTION BANDPASS ALIASING GENERATOR FILTER (8th ORDER) DIVIDER FILTER BIPHASE CONTAS LOOP DEFFERENTIAL CLOCKED SYMBOL VARIABLE AND DECODER COMPARATOR DECODER FIXED DIVIDER CLOCK REGENERATION AND SYNC REFERENCE VOLTAGE IC901 NJM2103D IC502 TC9184P...

  • Page 28: Ic Pin Functions

    3-20. IC PIN FUNCTIONS • IC103 uPD780208GF (DISPLAY BOARD) Pin No. Pin Name Function — Power Supply (+5 V) VDD.+5V Video IC SW1 Video IC SW2 Video IC SW3 Ground through resister — S Mute S.MUTE Not used (Connected to ground) (S.MUTE) A-class mute AC.MUTE...
  • Page 29 Pin No. Pin Name Function DIRECT.PASS Direct pass relay SUR.RY Surround relay CENTER.RY Center relay FRONT.RY Front relay MIX/SUB.RY Mix/sub relay VDD.+5V — +5 V PROTECTOR.IN Protector in POWER.RY Power relay BASS.BOOST Bass boost SP.OFF Speaker off VOL– Volume – VOL+ Volume + RE.A...

  • Page 30: Exploded Views

    SECTION 4 EXPLODED VIEWS NOTE: The components identified by • Items marked “*” are not stocked since they are mark ! or dotted line with mark seldom required for routine service. Some delay ! are critical for safety. should be anticipated when ordering these items. Replace only with part number •...

  • Page 31: Front Panel Section

    1-773-024-11 WIRE (FLAT TYPE)(15 CORE)(320mm) 4-900-568-21 PANEL, FRONT (DB825) 3-350-426-01 SPRING, RING 4-900-566-11 WINDOW 4-900-572-01 FULCRUM (L) 3-703-466-00 SPRING (6600) 4-942-568-41 EMBLEM (NO.5), SONY 4-900-571-01 FULCRUM (R) 4-900-577-01 SPRING (1)(R) X-3375-589-1 BASE ASSY, PANEL 4-900-576-01 SPRING (1)(L) 4-900-563-01 BUTTON (5)

  • Page 32: Chassis Section

    4-3. CHASSIS SECTION Q706 not supplied not supplied Q705 Q707 Q756 Q755 not supplied supplied Q757 T901 supplied Q506 Q505 Q507 Q557 Q556 Q605 Q555 Q606 Q607 Supplied with J701 supplied Supplied with RV401 not supplied The components identified by mark ! or dotted line with mark ! are critical for safety.

  • Page 33: Electrical Parts List

    SECTION 5 ELECTRICAL PARTS LIST Note: • Due to standardization, replacements in the parts list • SEMICONDUCTORS The components identified by In each case, u: µ , for example: may be different from the parts specified in the mark ! or dotted line with mark uA...: µ...
  • Page 34 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < IC > R532 1-249-437-11 CARBON 1/4W ! R533 1-249-393-11 CARBON 1/4W F IC809 8-759-708-05 IC NJM78L05A ! R534 1-249-389-11 CARBON 1/4W F < COIL > R535 1-249-431-11 CARBON 1/4W R539 1-249-427-11 CARBON...
  • Page 35 BALANCE CONNECTOR DISPLAY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < RELAY > C131 1-162-306-11 CERAMIC 0.01uF (DB825) RY501 1-515-920-11 RELAY (24V) C132 1-162-306-11 CERAMIC 0.01uF RY502 1-515-920-11 RELAY (24V) (DB825) RY602 1-515-793-11 RELAY C143 1-164-159-11 CERAMIC 0.1uF <...
  • Page 36 DISPLAY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark IC107 8-759-267-86 IC SN74HC00ANS-E20 (DB825) R146 1-249-383-11 CARBON 1/6W F (DB825) < COIL > R148 1-249-425-11 CARBON 4.7K 1/4W F (DB825) L101 1-410-509-11 INDUCTOR 10uH R150 1-249-409-11 CARBON 1/4W L102 1-408-080-00 INDUCTOR 100uH (DB825)
  • Page 37 DISPLAY FUNCTION INPUT Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark RR126 1-249-437-11 CARBON 1/4W C054 1-107-584-11 CERAMIC 0.25PF 500V RR127 1-249-437-11 CARBON 1/4W C056 1-162-282-31 CERAMIC 100PF C100 1-126-948-11 ELECT 100uF RR128 1-249-437-11 CARBON 1/4W C300 1-162-283-31 CERAMIC 120PF...
  • Page 38 INPUT Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C490 1-126-963-11 ELECT 4.7uF CC02 1-162-286-31 CERAMIC 220PF C508 1-136-495-11 FILM 0.068uF CC04 1-162-282-31 CERAMIC 100PF CC05 1-162-282-31 CERAMIC 100PF C509 1-136-153-00 FILM 0.01uF CC06 1-162-282-31 CERAMIC 100PF C510 1-110-335-11 MYLAR...
  • Page 39 INPUT Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < TRANSISTOR > R361 1-249-441-11 CARBON 100K 1/4W R362 1-249-417-11 CARBON 1/4W F Q300 8-729-922-37 TRANSISTOR 2SD2144S-UVW R363 1-249-417-11 CARBON 1/4W F Q301 8-729-922-37 TRANSISTOR 2SD2144S-UVW R364 1-249-429-11 CARBON 1/4W Q302...
  • Page 40 INPUT REAR AMP Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R558 1-249-441-11 CARBON 100K 1/4W R3063 1-249-429-11 CARBON 1/4W R559 1-247-903-00 CARBON 1/4W R3368 1-247-903-00 CARBON 1/4W R5002 1-249-429-11 CARBON 1/4W R560 1-249-426-11 CARBON 5.6K 1/4W R5052 1-249-429-11 CARBON...
  • Page 41 REAR AMP S VIDEO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R722 1-249-429-11 CARBON 1/4W J252 1-764-676-11 CONNECTOR (ROUND TYPE) R723 1-249-421-11 CARBON 2.2K 1/4W F (VIDEO 1 S-VIDEO OUT/IN) ! R724 1-249-408-11 CARBON 1/4W F J253 1-537-943-11 TERMINAL, S (TV/LD S-VIDEO IN) ! R725...
  • Page 42 SP SWITCH STANDBY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < TRANSISTOR > 1-670-101-11 SP SWITCH BOARD *************** Q544 8-729-119-79 TRANSISTOR 2SC2785-FEK Q609 8-729-281-53 TRANSISTOR 2SC1815-GR < CONNECTOR > Q610 8-729-900-63 TRANSISTOR DTA124ES Q611 8-729-900-63 TRANSISTOR DTA124ES CNS104 1-770-404-11 HOUSING, CONNECTOR (PC BOARD) 11P Q645 8-729-119-79 TRANSISTOR 2SC2785-FEK...
  • Page 43 STANDBY (2) SURR Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-4407-589-A STANDBY (2) BOARD, COMPLETE C355 1-126-925-11 ELECT 470uF *************************** C356 1-126-933-11 ELECT 100uF < CAPACITOR > C357 1-126-514-11 ELECT 22uF C358 1-126-514-11 ELECT 22uF C901 1-136-157-00 FILM 0.022uF...
  • Page 44 SURR Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C455 1-126-162-11 ELECT 3.3uF R323 1-249-397-11 CARBON 1/4W F C456 1-124-250-11 ELECT 0.15uF R400 1-249-441-11 CARBON 100K 1/4W C457 1-124-250-11 ELECT 0.15uF C458 1-124-261-00 ELECT 10uF R401 1-249-436-11 CARBON 1/4W R402...
  • Page 45 VIDEO VIDEO (3) VOLUME Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark S122 1-762-751-11 SWITCH, TACTILE (SOUND FIELD ON/OFF) 1-670-100-11 VIDEO (3) BOARD *************** ************************************************************** < CAPACITOR > 1-670-097-11 VIDEO BOARD C299 1-164-159-11 CERAMIC 0.1uF *********** CC14 1-162-282-31 CERAMIC 100PF...
  • Page 46 STR-DB725/DB825 Ref. No. Part No. Description Remark Q505 8-729-209-15 TRANSISTOR 2SD2012 Q506 8-749-010-25 IC MN2488-OPY-M Q507 8-749-010-26 IC MP1620-OPY-M Q555 8-729-209-15 TRANSISTOR 2SD2012 Q556 8-749-010-25 IC MN2488-OPY-M Q557 8-749-010-26 IC MP1620-OPY-M Q605 8-729-209-15 TRANSISTOR 2SD2012 Q606 8-749-010-25 IC MN2488-OPY-M Q607...

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