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Sony STR-DB798 Service Manual
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Sony STR-DB798 Service Manual

Fm stereo fm/am receiver
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SERVICE MANUAL
Ver. 1.0 2005.07
This receiver incorporates Dolby* Digital and Pro
Logic Surround and the DTS** Digital Surround
System.
* Manufactured under license from Dolby
Laboratories.
"Dolby", "Pro Logic" and the double-D symbol are
trademarks of Dolby Laboratories.
** "DTS" and "DTS Digital Surround" are registered
trademarks of Digital Theater Systems, Inc.
Sony Corporation
9-879-775-01
Audio Group
2005G05-1
Published by Sony Engineering Corporation
© 2005.07
STR-DB798
SPECIFICATIONS
Amplifier section
Power Output
Models of area code CEL, CEK, TW
Rated Power Output at Stereo Mode
(8 ohms 20 Hz – 20 kHz, THD 0.09%)
1)
100 W + 100 W
(8 ohms 1 kHz, THD 0.7%)
1)
110 W + 110 W
(8 ohms 1 kHz, THD 10%)
1)
135 W + 135 W
1)
Reference Power Output
(8 ohms 20 Hz – 20 kHz, THD 0.09%)
2)
FRONT
:
100 W/ch
2)
CENTER
:
100 W
2)
SURR
:
100 W/ch
2)
SURR BACK
:
100 W/ch
(8 ohms 1 kHz, THD 0.7%)
2)
FRONT
:
110 W/ch
2)
CENTER
:
110 W
2)
SURR
:
110 W/ch
2)
SURR BACK
:
110 W/ch
(8 ohms 1 kHz, THD 10%)
2)
FRONT
:
135 W/ch
2)
CENTER
:
135 W
2)
SURR
:
135 W/ch
2)
SURR BACK
:
135 W/ch
1) Measured under the following conditions:
Area code
Power requirements
AEP, UK
230 V AC, 50 Hz
Taiwan
110 V AC, 60 Hz
2) Depending on the sound field settings and the
source, there may be no sound output.
Frequency response
PHONO
RIAA equalization curve
±0.5 dB
MULTI CH IN, SA-CD/
10 Hz – 100 kHz
CD, MD/TAPE, DVD,
+0.5/–2 dB (when
TV/SAT, VIDEO 1, 2, 3
ANALOG DIRECT is
selected)
FM STEREO FM/AM RECEIVER
AEP Model
UK Model
Taiwan Model
Inputs (Analog)
PHONO
Sensitivity: 2.5 mV
Impedance: 50 k ohms
3)
S/N
: 86 dB
4)
(A, 2.5 mV
)
MULTI CH IN, SA-CD/
Sensitivity: 150 mV
CD, MD/TAPE, DVD,
Impedance: 50 k ohms
3)
TV/SAT, VIDEO 1, 2, 3
S/N
: 96 dB
4)
(A, 150 mV
)
3) INPUT SHORT.
4) Weighted network, input level.
Inputs (Digital)
DVD, SA-CD/CD
Sensitivity: –
(Coaxial)
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
DVD, TV/SAT,
Sensitivity: –
MD/TAPE, VIDEO 3
Impedance: –
(Optical)
S/N: 100 dB
(A, 20 kHz LPF)
Outputs (Analog)
MD/TAPE (OUT),
Voltage: 150 mV
VIDEO 1, 2
Impedance: 2.2 k ohms
(AUDIO OUT)
SUB WOOFER
Voltage: 2 V
Impedance: 1 k ohm
Outputs (Digital)
MD/TAPE (Optical)
Sensitivity: –
Equalizer
±10 dB, 1 dB step
Gain levels
– Continued on next page –

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  • Page 1 10 Hz – 100 kHz CD, MD/TAPE, DVD, +0.5/–2 dB (when TV/SAT, VIDEO 1, 2, 3 ANALOG DIRECT is selected) – Continued on next page – FM STEREO FM/AM RECEIVER Sony Corporation 9-879-775-01 Audio Group 2005G05-1 Published by Sony Engineering Corporation © 2005.07...
  • Page 2 COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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.

  • Page 3: Table Of Contents

    STR-DB798 TABLE OF CONTENTS SERVICING NOTES EXPLODED VIEWS ..........4 7-1. Overall Section ..............69 GENERAL 7-2. Back Panel Section ............70 ..............6 7-3. Main Board Section ............71 7-4. Heat Sink Section ............72 DISASSEMBLY 7-5. Chassis Section ..............73 3-1.

  • Page 4: Servicing Notes

    STR-DB798 SECTION 1 SERVICING NOTES • MODEL IDENTIFICATION UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the lead- – Back Panel – free mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with...
  • Page 5 STR-DB798 SERVICE POSITION When checking without back panel, it is necessary to connect the clip for GND to a chassis. COMP-V board (JW300) DIGITAL board (EB1101) clip AU-IN board (JW101) clip -MAIN BOARD SERVICE POSITION- DIGITAL board rear panel COMP-V board...

  • Page 6: General

    STR-DB798 SECTION 2 This section is extracted from instruction manual. GENERAL Receiver PUSH wf ALPHABETICAL ORDER M - Z SPEAKERS (OFF/A/B/A+B) wh MAIN MENU 4 SURR BACK DECODING ql A - L MASTER VOLUME –/+ qa TUNING –/+ w; A.F.D. qj...

  • Page 7: Disassembly Flow

    STR-DB798 SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. DISASSEMBLY FLOW 3-2. CASE (Page 7) 3-3. COMP-V BOARD (Page 8) 3-4. BACK PANEL BLOCK (Page 8) 3-5. DIGITAL BOARD, A/V SYNC BOARD (Page 9) 3-6.

  • Page 8: Comp-V Board

    STR-DB798 3-3. COMP-V BOARD 6 COMP-V board 3 two connectors 5 connector (CN919, 3801) (CN3052) 2 feeder fixed screw 1 two screws (BVTP3 × 8) 3 connector (CN168) 3-4. BACK PANEL BLOCK 3 eight screws (BVTP3 × 8) 6 two screws (BVTP4 ×...

  • Page 9: Digital Board, A/V Sync Board

    STR-DB798 3-5. DIGITAL BOARD, A/V SYNC BOARD 8 A/V SYNC holder 9 A/V SYNC board 7 DIGITAL board 4 three connectors (CN107, 1110, 1112) 6 connector (CNS551) 3 wire 5 screw (flat type) (BVTP3 × 8) (31 core) (CN1105) 1 two connectors (CN402, 403) 3-6.

  • Page 10: Main Board Block

    STR-DB798 3-7. MAIN BOARD BLOCK 1 connector (CN418) 3 four screws (BVTP3 × 8) 2 four screws (BVTP3 × 8) 1 three connectors (CN907, 909, 910) 4 MAIN board block 3-8. MAIN BOARD 2 three connectors (CN18, 28, 38) 6 A CLASS board...

  • Page 11: Test Mode

    STR-DB798 SECTION 4 TEST MODE TUNER FACTORY PRESET MODE VERSION CHECK MODE All preset contents are reset to the default setting. The version of the micro computer displayed. Procedure: Procedure: 1. While pressing the [MUSIC] and [PRESET TUNING --] buttons, 1.

  • Page 12: Electrical Adjustments

    STR-DB798 SECTION 5 ELECTRICAL ADJUSTMENTS BIAS ADJUSTMENT Condition: input signal: no signal (no load) volume: minimum Connection digital voltmeter CN432 (CN482, 532, 582, 632, 682, 732) pin 1 – CN432 (CN482, 532, 582, 632, 682, 732) pin 2 Procedure: 1. Connect a digital voltmeter to the CN432 (CN482, CN532, CN582, CN632, CN682, CN732) on the MAIN board.

  • Page 13: Block Diagram − Tuner/Video Section

    STR-DB798 SECTION 6 DIAGRAMS 6-1. BLOCK DIAGRAM – TUNER/VIDEO Section – INPUT SELECT IC1304 J301 (1/2) TUNER-L J301 (2/2) CH1IN3 CH1OUT (Page 15) CH1IN2 TUNER COMPONENT COAXIAL TV/SAT MONITOR L CH CH2IN3 CH2OUT VIDEO FM 75 /B-Y /B-Y ASSIGNABLE CH2IN2...

  • Page 14: Block Diagram − Audio Dsp Section

    STR-DB798 6-2. BLOCK DIAGRAM – AUDIO DSP Section – BCKO, LRCKO S-RAM D0 – D15 A0 – A15 IC1202 (Page 15) 7 – 10, 13 – 16, 5 – 1, 44 – 42, 29 – 32, 35 – 38 27 – 24, 21 – 18...

  • Page 15: Block Diagram − Audio Control Section

    STR-DB798 6-3. BLOCK DIAGRAM – AUDIO CONTROL Section – AUDIO SELECTOR IC101 J101 FRONT 5.1FL AUDIO SELECTOR IC173 SURR 12 5.1SL VRIN LINE AMP AUDIO FLOUT BUFFER IC110 TRIM MULTI CH IN IC402 CENTER 28 5.1 C BUFFER (Page 16)

  • Page 16: Block Diagram − Audio Amp Section

    STR-DB798 6-4. BLOCK DIAGRAM – AUDIO AMP Section – J1086 R-CH PHONES RY806 RELAY DRIVE TM699 Q823 BIAS BOOSTER PRE DRIVE Q2204, 2205 Q602 – Q2201, 2203 RV631 RY449 D411 CURRENT BIAS FRONT A (Page 15) – BIAS DETECT Q631, 634...

  • Page 17: Block Diagram − Display, Key Control Section

    STR-DB798 6-5. BLOCK DIAGRAM – DISPLAY, KEY CONTROL Section – SYSTEM CONTROLLER IC1703 (5/6) REMOTE ROTARY +/–.JOG (4A) CONTROL 63 SIRCS ENCODER MENU RECEIVER +/–.JOG (4B) RV1051 IC1051 ROTARY +/–.JOG (3A) ENCODER –/+ +/–.JOG (3B) RV1052 ROTARY VOL.JOG (1A) MASTER...

  • Page 18: Block Diagram − Power Supply Section

    STR-DB798 6-6. BLOCK DIAGRAM – POWER SUPPLY Section – (AEP, Taiwan) S901 IMPEDANCE SELECTOR 8Ω T901 MAIN POWER TRANSFORMER 4Ω MUTING +5V REGULATOR B– Q824 BIAS LIMITER SWITCH RECT TUNER +9V B– Q2602 D914 +3.3V BIAS LIMITER SWITCH REGULATOR REGULATOR TUNER +3.3V...
  • Page 19 STR-DB798 • Note for Printed Wiring Boards and Schematic Diagrams • Circuit Boards Location Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. (p: pF) •...

  • Page 20: Printed Wiring Board − Digital Board (Component Side)

    STR-DB798 • See page 19 for Circuit Boards Location. 6-7. PRINTED WIRING BOARD – DIGITAL BOARD (Component Side) – : Uses unleaded solder. (Page 26) A/V SYNC BOARD CN2001 DIGITAL BOARD (COMPONENT SIDE) • Semiconductor Location (AEP, UK) Ref. No. Location...

  • Page 21: Printed Wiring Board − Digital Board (Conductor Side)

    STR-DB798 • See page 19 for Circuit Boards Location. 6-8. PRINTED WIRING BOARD – DIGITAL BOARD (Conductor Side) – : Uses unleaded solder. ANTENNA COAXIAL FM 75Ω TUNER DIGITAL BOARD (CONDUCTOR SIDE) • Semiconductor Location (AEP, UK) IC1903 IC1904 Ref. No. Location...

  • Page 22: Schematic Diagram − Digital Board (1/4)

    STR-DB798 • See page 52 for Waveforms. • See page 53 for IC Block Diagrams. • See page 61 for IC Pin Function Description. 6-9. SCHEMATIC DIAGRAM – DIGITAL BOARD (1/4) – (1/4) IC1104 TORX147L R1127 OPTICAL R1120 DVD IN...

  • Page 23: Schematic Diagram − Digital Board (2/4)

    STR-DB798 • See page 52 for Waveforms. • See page 53 for IC Block Diagrams. • See page 61 for IC Pin Function Description. 6-10. SCHEMATIC DIAGRAM – DIGITAL BOARD (2/4) – (2/4) FB1201 JR1121 FB1202 (Page 22) C1213 C1214...

  • Page 24: Schematic Diagram − Digital Board (3/4)

    STR-DB798 • See page 52 for Waveforms. • See page 53 for IC Block Diagrams. 6-11. SCHEMATIC DIAGRAM – DIGITAL BOARD (3/4) – TUNER (Page 23) COAXIAL FM 75Ω ANTENNA IC1905 IC1902 BA33BC0T TA7809 CN1103 11P (EXCEPT AEP,UK) (AEP,UK) C1915...

  • Page 25: Schematic Diagram − Digital Board (4/4)

    STR-DB798 • See page 52 for Waveforms. • See page 61 for IC Pin Function Description. 6-12. SCHEMATIC DIAGRAM – DIGITAL BOARD (4/4) – (Page 22) +8V (DAB) Q1957 (4/4) 2SB733 GND (D) DAB-PWR5 D1907 1SR154-400 TE-25 (NC) C1905 DAB-PWR...

  • Page 26: Printed Wiring Board − A/V Sync Board

    STR-DB798 • See page 19 for Circuit Boards Location. 6-13. PRINTED WIRING BOARD – A/V SYNC BOARD – : Uses unleaded solder. DIGITAL BOARD CNS551 A/V SYNC BOARD A/V SYNC BOARD (COMPONENT SIDE) (CONDUCTOR SIDE) (Page 20) R2006 R2005 CN2001...

  • Page 27: Schematic Diagram − A/V Sync Board

    STR-DB798 • See page 61 for IC Pin Function Description. 6-14. SCHEMATIC DIAGRAM – A/V SYNC BOARD – FB2003 FB2002 C2002 C2004 C2003 R2007 0.01 CN2001 R2011 FLFR0 R2012 SLSR0 FLFRI DSP SD01 R2013 CSW0 SLSRI DSP SD02 R2014 DLDR0...

  • Page 28: Printed Wiring Boards − Video Section

    STR-DB798 • See page 19 for Circuit Boards Location. 6-15. PRINTED WIRING BOARDS – VIDEO Section – : Uses unleaded solder. J302 MONITOR OUT VIDEO BOARD VIDEO-AU BOARD (CHASSIS) VIDEO 1 IN HP-V3 VIDEO 1 AUDIO IN BOARD CN1091 (Page 30)

  • Page 29: Schematic Diagram − Video Section

    STR-DB798 • See page 53 for IC Block Diagrams. 6-16. SCHEMATIC DIAGRAM – VIDEO Section – C215 2200p CN202 (CHASSIS) E304 V3 R C304 (CHASSIS) 2200p E302 V3 GND V3 L C302 (CHASSIS) 2200p J202 (Page J302 CN301 CN201 R256...

  • Page 30: Printed Wiring Boards − S-Video Section

    STR-DB798 • See page 19 for Circuit Boards Location. 6-17. PRINTED WIRING BOARDS – S-VIDEO Section – : Uses unleaded solder. VIDEO 3 (Page 32) INPUT DIGITAL OPTICAL COMP-V BOARD CN3801 S-VIDEO BOARD PHONES AUDIO S-VIDEO VIDEO HP-V3 BOARD (CHASSIS)

  • Page 31: Schematic Diagram − S-Video Section

    STR-DB798 • See page 53 for IC Block Diagrams. 6-18. SCHEMATIC DIAGRAM – S-VIDEO Section – IC1081 GP1FM313RZ C1081 DIGITAL OPTICAL RECEIVER VIDEO 3 INPUT DIGITAL OPTICAL R1081 C1088 J1086 PHONES CN1081 EP1086 VCC(3.3V) OPT GND (Page 47) C1098 C1097...

  • Page 32: Printed Wiring Board − Comp-V Board

    STR-DB798 • See page 19 for Circuit Boards Location. 6-19. PRINTED WIRING BOARD – COMP-V BOARD – : Uses unleaded solder. COMPONENT VIDEO ASSIGNABLE MONITOR DVD IN TV/SAT IN /B-Y COMP-V BOARD /R-Y (CHASSIS) • Semiconductor Location (CHASSIS) Ref. No. Location...

  • Page 33: Schematic Diagram − Comp-V Board

    STR-DB798 • See page 52 for Waveforms. • See page 53 for IC Block Diagrams. 6-20. SCHEMATIC DIAGRAM – COMP-V BOARD – CNP3052 PS SAVE- C386 ∗ X371 ∗ L375 R303 SW1- R313 3.5795MHz (TW) 22µH (ARP,UK) R302 SW2- 4.43MHz (AEP,UK) 33µH...

  • Page 34: Printed Wiring Board − Au-In Board

    STR-DB798 • See page 19 for Circuit Boards Location. 6-21. PRINTED WIRING BOARD – AU-IN BOARD – : Uses unleaded solder. • Semiconductor COMP-V BOARD (Page 32) Location CN919 AU-IN BOARD Ref. No. Location MAIN BOARD (Page 36) IC101 EB403...

  • Page 35: Schematic Diagram − Au-In Board

    STR-DB798 • See page 53 for IC Block Diagrams. 6-22. SCHEMATIC DIAGRAM – AU-IN BOARD – C135 C137 100p R145 C161 (CHASSIS) 0.01 R131 CN104 2.2k C145 R141 J151 IC131(1/2) M5218AP-22 C131 100P R133 R135 R137 R139 100k 8.2k 100k...

  • Page 36: Printed Wiring Board − Main Board

    STR-DB798 • See page 19 for Circuit Boards Location. : Uses unleaded solder. 6-23. PRINTED WIRING BOARD – MAIN BOARD – (Page 34) (Page 34) (Page 28) (Page 28) (Page 48) (Page 30) (Page 30) (Page 44) (Page 48) SPK-A BOARD...

  • Page 37: Schematic Diagram − Main Board (1/3)

    STR-DB798 • See page 53 for IC Block Diagrams. 6-24. SCHEMATIC DIAGRAM – MAIN BOARD (1/3) – (1/3) C818 CN405 +15V R841 Q824 CN402 2SC1815YGR R828 -15V 4.7k C817 STOP STOP C819 REGULATOR PW-RY PW-RY C814 C815 F-LAT FUN-LAT D815 HZS6B2 SUB.T...

  • Page 38: Schematic Diagram − Main Board (2/3)

    STR-DB798 6-25. SCHEMATIC DIAGRAM – MAIN BOARD (2/3) – (Page 37) CN411 (Page 45) SR-RY FB-RY (2/3) FA-RY 24V(RY) CN410 (Page 45) JWH002 R593 CN412 (Page 45) R812 2.2k Q582 2SA1038S R816 Q807 R588 CURRENT 2SC1740TP-FEK DETECT RELAY DRIVE D581...

  • Page 39: Schematic Diagram − Main Board (3/3)

    STR-DB798 6-26. SCHEMATIC DIAGRAM – MAIN BOARD (3/3) – (3/3) R636 R632 4.7k 2.2k C632 220p Q634 2SA1115 Q602 BIAS R612 MN2488 Q631 CN632 BOOSTER 2SC3623A RV631 BIAS (FOR ADJUSTMENT) Q633 2SA1038S C631 R631 CURRENT R614 0.22X2 DETECT R637 1.8k...

  • Page 40: Printed Wiring Board − A Class Board

    STR-DB798 • See page 19 for Circuit Boards Location. 6-27. PRINTED WIRING BOARD – A CLASS BOARD – : Uses unleaded solder. (Page 36) (Page 36) (Page 36) (Page 36) (Page 36) MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD...

  • Page 41: Printed Wiring Boards − Stay Section

    STR-DB798 • See page 19 for Circuit Boards Location. 6-28. PRINTED WIRING BOARDS – STAY Section – : Uses unleaded solder. (Page 40) (Page 40) (Page 40) (Page 36) A CLASS BOARD A CLASS BOARD A CLASS BOARD MAIN BOARD...

  • Page 42: Schematic Diagram − A Class Section (1/2)

    STR-DB798 6-29. SCHEMATIC DIAGRAM – A CLASS Section (1/2) – (1/2) C2410 2200p GNDA 100V CN2401 C2310 2200p 100V BIAS+ C2409 R2419 C2408 2200p 100V 220p 100V BIAS- R2014 R2214 R2414 C2508 GNDB 220p 100V R2416 BIAS+ (Page 43) R2519...

  • Page 43: Schematic Diagram − A Class Section (2/2)

    STR-DB798 6-30. SCHEMATIC DIAGRAM – A CLASS Section (2/2) – (2/2) CN2005 CN18 Q2705 2SA949 R2714 BIAS EB18 (CHASSIS) C2708 Q2704 Q2706 R2716 220p 2SA992 2SC2229 R2713 R2715 100V BIAS BIAS R2719 D2701 MTZJ5.6B CN2004 CN28 C2707 4p 500V C2705...

  • Page 44: Printed Wiring Boards − Speaker Section

    STR-DB798 • See page 19 for Circuit Boards Location. 6-31. PRINTED WIRING BOARDS – SPEAKER Section – : Uses unleaded solder. (Page 36) (Page 36) MAIN BOARD MAIN BOARD CN410 CN411 SPK-B BOARD (NC) SPK-A BOARD (CHASSIS) TM444 CN451 TM699 –...

  • Page 45: Schematic Diagram − Speaker Section

    STR-DB798 6-32. SCHEMATIC DIAGRAM – SPEAKER Section – C549 0.01 L549 RY549 R548 CN449 R549 (CHASSIS) C448 470p R598 C598 470p L599 C599 0.01 D549 R599 1SS133 (Page 38) R547 CN448 SURR SR-RY C443 0.01 FB-RY L449 RY444 FA-RY TM449...

  • Page 46: Printed Wiring Boards − Display Section

    STR-DB798 • See page 19 for Circuit Boards Location. 6-33. PRINTED WIRING BOARDS – DISPLAY Section – : Uses unleaded solder. • Semiconductor DIRECT BOARD Location Ref. No. Location D1031 I-13 D1071 I-11 IC1001 H-13 R1057 R1060 VOL BOARD IC1006...

  • Page 47: Schematic Diagram − Display Section

    STR-DB798 6-34. SCHEMATIC DIAGRAM – DISPLAY Section – RV1051 RV1052 ROTARY ENCODER ROTARY ENCODER R1035 R1036 4.7k MENU R1032 REMOTE CN1001 CONTROL RECEIVER D1071 C1071 AC 6V C1031 HZ6.8BP IC1051 R1037 NJL24H400A 4.7k R1033 AC 6V POWER R1059 Q1031 Q1032...

  • Page 48: Printed Wiring Boards − Dc Section

    STR-DB798 • See page 19 for Circuit Boards Location. 6-35. PRINTED WIRING BOARDS – DC Section – : Uses unleaded solder. (Page 50) (Page 36) AC BOARD MAIN BOARD DC PWR BOARD CN51 CN422 (CHASSIS) CN912 MAIN POWER R912 TRANSFORMER...

  • Page 49: Schematic Diagram − Dc Section

    STR-DB798 6-36. SCHEMATIC DIAGRAM – DC Section – (AEP,TW) CN911 CN902 S901 CN901 IMPEDANCE C917 C919 JW902 SELECTOR HI-A 0.015 100V 200V 4Ω 8Ω LO-A JW903 CN910 R913 (Page 39) C915 D914 JW901 LO-B 8200 D6SBN20 HI-B B GND (Page 51) C918 0.015...

  • Page 50: Printed Wiring Board − Ac Board

    STR-DB798 • See page 19 for Circuit Boards Location. 6-37. PRINTED WIRING BOARD – AC BOARD – : Uses unleaded solder. (AEP, TW) AC BOARD 4-8 OHM BOARD CN901 (Page 48) (CHASSIS) DC PWR BOARD CN906 (Page 48) DC PWR...

  • Page 51: Schematic Diagram − Ac Board

    STR-DB798 6-38. SCHEMATIC DIAGRAM – AC BOARD – ∗ 10A 125V (TW) T4AL 250V (AEP,UK) T901 MAIN POWER (AEP,TW) TRANSFORMER ∗ HI-B LO-B 2200 2.2k LO-A 2SC2785 (Page 49) HI-A AC POWER DETECT CN51 STOP +24V -24V 2SC1740TP RELAY (Page 49) P.RY...
  • Page 52 STR-DB798 • Waveforms – DIGITAL Board – – COMP-V Board – IC1101 qd (CKOUT) IC1201 qg (LRCKI1), IC1401 qf (BCK) IC371 4 (X’TAL) (VIDEO 1 wk (LRCKI2) mode) (AEP, UK) 3.6 Vp-p 4.2 Vp-p 5.4 Vp-p 120 mVp-p 20.8 µs...
  • Page 53 STR-DB798 • IC Block Diagrams – DIGITAL Board – IC1101 LC89056W-E AUDIO C BIT PA/PB DETECT DETECT EMPHA SAMPLING XSEL FREQUENCY MICROCOMPUTER MODE0 INTERFACE MODE1 LOCK XOUT X’ TAL DGND DETECT XMCK DVDD 19 DVDD 18 DGND XSTATE DATAO LRCK...
  • Page 54 STR-DB798 IC1401 PCM1800E/2K 15 14 13 DIGITAL ∑ MODULATOR 1/64 SERIAL I/O DECIMATION INTERFACE FILTER & & MODE/FORMAT LOW-CUT CONTROL DIGITAL ∑ FILTER MODULATOR SINGLE-END SINGLE-END CLOCK/ DEFERENTIAL REFERENCE DEFERENTIAL TIMING CONTROL RESET/ CONVERTER CONVERTER POWER CONTROL IC1501 PCM1609KPTR 36 35 34 33...
  • Page 55 STR-DB798 – VIDEO-AU Board – IC201 TC9273N-014 10BIT 10BIT LATCH LATCH CIRCUIT CIRCUIT (L-CH) (R-CH) LEVEL SHIFT & SHIFT REGISTER DATA – VIDEO Board – IC301 NJM2595D VOUT1 75Ω DRIVER VIN5 16 V+ 75Ω VIN4 DRIVER 15 VOUT2 VIN3 14 SW1 13 VIN1 V–...
  • Page 56 STR-DB798 – S-VIDEO Board – IC850, 851 NJM2595D IC852 LA7213 SYNC V-SYNC VOUT1 75Ω DRIVER VIN5 16 V+ 75Ω VIN4 DRIVER 15 VOUT2 VIN3 14 SW1 13 VIN1 V– 12 GND 75Ω DRIVER 11 VOUT3 10 SW2 9 VIN2 – COMP-V Board –...
  • Page 57 STR-DB798 IC371 MM1093PFB (AEP, UK model) MM1093NF (Taiwan model) 4FSC SYNV DIVIDER APC2 (1/4) APC1 VCXO IC372 NJM2268D 75Ω DRIVER BIAS CLAMP 75Ω DRIVER...
  • Page 58 STR-DB798 IC1304 NJM2586AM 75Ω DRIVER CONT1 CH1 IN1 24 CH1 OUT BIAS CONT2 CH1 IN2 23 PS 75Ω DRIVER CONT1 BIAS 22 CH2 OUT CH1 IN3 BIAS 21 V+2 75Ω DRIVER CONT1 CH2 IN1 20 CH3 OUT BIAS 19 GND...
  • Page 59 STR-DB798 IC173 TC9273F-012 (EL) 10BIT 10BIT LATCH LATCH CIRCUIT CIRCUIT (L-CH) (R-CH) LEVEL SHIFT & SHIFT REGISTER DATA – MAIN Board – IC401, 501, 601, 651 CXD9725M 28 NC TRIM VOLUME TRIM VOLUME 26 VDD 0-+24dB/ 0-+24dB/ 1dB STEP 1dB STEP...
  • Page 60 STR-DB798 – DISPLAY Board – IC1001 uPD16315GB-3BS LED1 LED2 4-BIT LATCH LED3 LED4 GRID 12-BIT SHIFT DRIVER REGISTER KEY DATA MEMORY 33 SEG19/GRID10 (2 x 16 BITS) 32 SEG18/GRID11 31 SEG17/GRID12 DATA MULTIPLEXED TIMING GENERATOR 30 VEE SELECTOR DRIVER KEY SCAN...
  • Page 61 STR-DB798 • IC Pin Function Description DIGITAL BOARD IC1101 LC89056W-E (DIGITAL AUDIO INTERFACE RECEIVER) Pin No. Pin Name Description DISEL Selection signal input terminal of data input terminal Fixed at "L" in this set DOUT Digital data output to the digital optical transceiver...
  • Page 62 STR-DB798 DIGITAL BOARD IC1201 CXD9718BQ (AUDIO DIGITAL SIGNAL PROCESSOR) Pin No. Pin Name Description Ground terminal XRST System reset signal input from the system controller "L": reset EXTIN Master clock signal input terminal Not used Sampling frequency selection signal input terminal Not used VDDI Power supply terminal (+2.5V)
  • Page 63 STR-DB798 Pin No. Pin Name Description Ground terminal WMD0 External memory wait mode setting terminal Fixed at "H" in this set PAGE2 External memory page selection signal output terminal Not used Ground terminal 52, 53 PAGE1, PAGE0 External memory page selection signal output terminal Not used...
  • Page 64 STR-DB798 DIGITAL BOARD IC1703 MB91154PFV-G-125E1 (SYSTEM CONTROLLER) Pin No. Pin Name Description PW RY Relay drive signal output terminal (for main power) "H": relay on H/P RY Relay drive signal output terminal (for headphone) "H": relay on SP.A.RY Relay drive signal output terminal (for front A speaker) "H": relay on SP B RY Relay drive signal output terminal (for front B speaker) "H": relay on...
  • Page 65 STR-DB798 Pin No. Pin Name Description Ground terminal Not used DAB_SEL DAB selection signal output terminal Not used RDS.DATA RDS serial data input from the tuner unit (AEP and UK models only) TUNER ST FM stereo detection signal input from the tuner unit...
  • Page 66 STR-DB798 Pin No. Pin Name Description DA1LAT Serial data latch pulse signal output to the D/A converter DACCLK Serial data transfer clock signal output to the D/A converter DAC_MDI Serial data output to the D/A converter NO_USE Not used Power supply terminal (+3.3V)
  • Page 67 STR-DB798 A/V SYNC BOARD IC2010 CXD9722TQ (LIP SYNC ADJUST) Pin No. Pin Name Description 1 to 5 D1 to D5 Two-way data bus with the SD-RAM Power supply terminal (+3.3V) 7, 8 D6, D7 Two-way data bus with the SD-RAM...
  • Page 68 STR-DB798 Pin No. Pin Name Description Ground terminal DLDRI Surround back audio data input from the audio digital signal processor CSWI Center and sub woofer audio data input from the audio digital signal processor SLSRI Surround audio data input from the audio digital signal processor...

  • Page 69: Exploded Views

    STR-DB798 SECTION 7 EXPLODED VIEWS NOTE: • Items marked “*” are not stocked since they • -XX and -X mean standardized parts, so they The components identified by mark 0 or dotted line with mark 0 are may have some difference from the original are seldom required for routine service.

  • Page 70: Back Panel Section

    STR-DB798 7-2. BACK PANEL SECTION supplied MAIN board section (AEP, TW) (AEP, TW) not supplied (4-8 OHM board) supplied not supplied chassis section supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-655-653-21 BAND (TAITON), BINDING...

  • Page 71: Main Board Section

    STR-DB798 7-3. MAIN BOARD SECTION not supplied not supplied (VIDEO board) (SPK-A board) not supplied not supplied (SPK-B board) (VIDEO-AU board) not supplied (STAY-5 board) supplied supplied supplied heat sink section Ref. No. Part No. Description Remark Ref. No. Part No.

  • Page 72: Disassembly 7-4. Heat Sink Section

    STR-DB798 7-4. HEAT SINK SECTION not supplied (FAN board) not supplied (STAY-1 board) Q403 Q402 Q452 not supplied Q703 (STAY-2 board) Q702 Q453 Q603 Q602 Q653 Q652 Q503 Q502 not supplied Q552 not supplied Q553 not supplied Ref. No. Part No.

  • Page 73: Chassis Section

    STR-DB798 7-5. CHASSIS SECTION not supplied (AC board) F903 F904 supplied T901 supplied not supplied (DC PWR board) not supplied not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-4955-348-1 FOOT ASSY 0 F904...

  • Page 74: Front Panel Section

    4-232-569-22 KNOB (FN DE9) (for SILVER) X-4953-000-1 WINDOW ASSY, REMOTE CONTROL 4-245-437-01 KNOB (MENU) (for BLACK) 4-245-437-21 KNOB (MENU) (for GOLD) 4-942-568-41 EMBLEM (NO.5), SONY (for BLACK) 4-245-437-31 KNOB (MENU) (for SILVER) 4-942-568-51 EMBLEM (NO.5), SONY (for GOLD) 1-773-339-11 WIRE (FLAT TYPE) (31 CORE) 4-942-568-61 EMBLEM (NO.5), SONY (for SILVER)

  • Page 75: Panel Base Section

    STR-DB798 7-7. PANEL BASE SECTION not supplied (HP-V3 board) not supplied supplied with J1081 not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-245-438-02 PLATE, INDICATION (for BLACK) 4-245-436-31 BUTTON (MENU) (for SILVER) 4-245-438-21 PLATE, INDICATION (for SILVER, GOLD) 3-087-053-01 +BVTP2.6 (3CR)

  • Page 76: Electrical Parts List

    STR-DB798 SECTION 8 4-8 OHM A CLASS ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark 0 are parts list may be different from the parts are seldom required for routine service.
  • Page 77 STR-DB798 A CLASS Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C2711 1-137-503-11 FILM 100PF 100V Q2602 8-729-024-93 TRANSISTOR 2SB1565E C2807 1-137-389-11 MYLAR 0.0022uF 5% 100V Q2603 8-729-140-84 TRANSISTOR 2SC1841-PAFAEA C2808 1-137-389-11 MYLAR 0.0022uF 5% 100V...
  • Page 78 STR-DB798 A CLASS A/V SYNC Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R2216 1-259-458-61 CARBON 1/6W R2605 1-259-420-61 CARBON 1/6W R2606 1-259-420-61 CARBON 1/6W R2219 1-259-408-61 CARBON 1/6W R2607 1-259-480-61 CARBON 150K 1/6W R2301 1-259-428-61 CARBON...
  • Page 79 STR-DB798 A/V SYNC AU-IN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R2003 1-216-809-11 METAL CHIP 1/10W CN51 1-778-227-41 CONNECTOR, BOARD TO BOARD 6P R2004 1-216-821-11 METAL CHIP 1/10W R2005 1-216-809-11 METAL CHIP 1/10W < DIODE >...
  • Page 80 STR-DB798 AU-IN COMP-V Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C121 1-127-880-11 CERAMIC 0.022uF R114 1-259-468-61 CARBON 1/6W R115 1-259-468-61 CARBON 1/6W C122 1-127-880-11 CERAMIC 0.022uF R119 1-259-428-61 CARBON 1/6W C123 1-128-809-11 CERAMIC 100PF R131 1-259-436-61 CARBON 2.2K...
  • Page 81 STR-DB798 COMP-V Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C310 1-126-960-11 ELECT C311 1-126-960-11 ELECT C955 1-136-169-00 MYLAR 0.22uF C312 1-126-960-11 ELECT C956 1-126-935-11 ELECT 470uF C3801 1-126-933-11 ELECT 100uF C313 1-126-960-11 ELECT C3802 1-127-888-11 CERAMIC 0.1uF...
  • Page 82 STR-DB798 COMP-V DC PWR DIGITAL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R305 1-247-804-11 CARBON 1/4W C908 1-112-124-11 ELECT 1000uF C909 1-126-970-11 ELECT 330uF R306 1-247-804-11 CARBON 1/4W C915 1-112-031-11 ELECT (BLOCK) 8200uF R307 1-247-804-11 CARBON...
  • Page 83 STR-DB798 DIGITAL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < CAPACITOR > C1231 1-164-156-11 CERAMIC CHIP 0.1uF C1233 1-164-156-11 CERAMIC CHIP 0.1uF C1100 1-164-222-11 CERAMIC CHIP 0.22uF C1234 1-162-920-11 CERAMIC CHIP 27PF C1101 1-164-156-11 CERAMIC CHIP 0.1uF...
  • Page 84 STR-DB798 DIGITAL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C1594 1-112-129-11 ELECT 100uF CN1102 1-764-867-41 CONNECTOR, BOARD TO BOARD 20P C1601 1-164-156-11 CERAMIC CHIP 0.1uF CN1103 1-568-830-11 CONNECTOR, FFC 11P (TW) CN1103 1-784-776-11 CONNECTOR, FFC 15P (AEP, UK)
  • Page 85 STR-DB798 DIGITAL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1023 1-216-809-11 METAL CHIP 1/10W IC1204 8-759-546-74 IC TC7WH157FU (TE12R) R1024 1-216-809-11 METAL CHIP 1/10W IC1401 8-759-560-56 IC PCM1800E/2K R1025 1-216-809-11 METAL CHIP 1/10W IC1402 8-759-636-55 IC M5218AFP...
  • Page 86 STR-DB798 DIGITAL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1226 1-216-864-11 SHORT CHIP R1583 1-216-821-11 METAL CHIP 1/10W R1304 1-216-841-11 METAL CHIP 1/10W R1584 1-216-845-11 METAL CHIP 100K 1/10W R1590 1-216-832-11 METAL CHIP 8.2K 1/10W...
  • Page 87 STR-DB798 DIGITAL DIRECT DISPLAY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1652 1-216-833-11 METAL CHIP 1/10W R1715 1-216-833-11 METAL CHIP 1/10W R1653 1-216-833-11 METAL CHIP 1/10W R1716 1-216-833-11 METAL CHIP 1/10W R1654 1-216-833-11 METAL CHIP...
  • Page 88 STR-DB798 DISPLAY FUNC HP-V3 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1059 1-247-807-31 CARBON 1/4W C1022 1-128-813-11 CERAMIC 220PF C1023 1-128-813-11 CERAMIC 220PF < VARIABLE RESISTOR > C1024 1-128-813-11 CERAMIC 220PF C1025 1-128-813-11 CERAMIC 220PF RV1051 1-467-808-21 ENCODER, ROTARY (MENU) RV1052 1-467-808-21 ENCODER, ROTARY ( −...
  • Page 89 STR-DB798 HP-V3 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < IC > C563 1-127-876-11 CERAMIC 0.01uF C566 1-136-161-00 MYLAR 0.047uF IC1081 6-600-219-01 IC GP1FM313RZ0F (VIDEO 3 INPUT C567 1-136-165-00 MYLAR 0.1uF DIGITAL OPTICAL) C568...
  • Page 90 STR-DB798 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < CONNECTOR > D823 8-719-921-48 DIODE MTZJ-5.6C CN401 1-770-382-11 CONNECTOR, BOARD TO BOARD 12P < EARTH TERMINAL > CN402 1-573-852-11 CONNECTOR, BOARD TO BOARD 20P CN403...
  • Page 91 STR-DB798 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q803 8-729-042-09 TRANSISTOR 2SA1038S-RSE-TP R515 1-259-468-61 CARBON 1/6W Q805 8-729-140-84 TRANSISTOR 2SC1841-PAFAEA Q807 8-729-119-78 TRANSISTOR 2SC2785-HFE R516 1-259-476-61 CARBON 100K 1/6W 0 R519 1-249-393-11 CARBON 1/4W F...
  • Page 92 STR-DB798 MAIN SPK-A Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R682 1-259-436-61 CARBON 2.2K 1/6W R852 1-259-460-61 CARBON 1/6W 0 R685 1-240-855-11 CARBON 6.2K 1/4W F R686 1-259-444-61 CARBON 4.7K 1/6W R853 1-259-460-61 CARBON 1/6W...
  • Page 93 STR-DB798 SPK-A STAY-1 STAY-2 STAY-5 S-VIDEO SPK-B Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 0 R493 0 R748 1-249-393-11 CARBON 1/4W F 1-249-393-11 CARBON 1/4W F 0 R498 1-249-393-11 CARBON 1/4W F 0 R749 1-249-393-11 CARBON...
  • Page 94 STR-DB798 S-VIDEO VIDEO VIDEO-AU Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C871 1-126-786-11 ELECT 47uF R883 1-247-804-11 CARBON 1/4W R884 1-247-804-11 CARBON 1/4W C872 1-127-888-11 CERAMIC 0.1uF R885 1-247-804-11 CARBON 1/4W C873 1-126-786-11 ELECT 47uF...
  • Page 95 STR-DB798 VIDEO-AU Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C211 1-127-880-11 CERAMIC 0.022uF 1-773-339-11 WIRE (FLAT TYPE) (31 CORE) C212 1-127-880-11 CERAMIC 0.022uF 0 F1 1-532-504-33 FUSE (T4AL/250V) (AEP, UK) 0 F1 C213 1-128-809-11 CERAMIC 100PF 1-533-312-12 FUSE GLASS CYLINDRICAL (DIA.5)
  • Page 96 STR-DB798 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision...

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