Sony-STRDB795-rec-sm 电路图 维修手册.pdf

SERVICE MANUAL FM STEREO FM/AM PECEIVER AEP Model UK Model E Model Australian Model SPECIFICATIONS STR-DB795 Ver 1.0 2004.10 9-879-195-01 2004J05-1 2004.10 Sony Corporation Audio Group Published by Sony Engineering Corporation 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. Continued on next page Amplifier section POWER OUTPUT Models of area code AEP, UK, TW, KR, AUS Rated Power Output at Stereo Mode (8 ohms 1 kHz, THD 0.7%) 100 W + 100 W2) 90 W + 90 W3) Reference Power Output2) (8 ohms 20 Hz20 kHz, THD 0.09%) FRONT1): 90 W + 90 W CENTER1): 90 W SURR1): 90 W + 90 W SURR BACK1): 90 W + 90 W (8 ohms 1 kHz, THD 0.7%) FRONT1): 100 W + 100 W CENTER1): 100 W SURR1): 100 W + 100 W SURR BACK1): 100 W + 100 W (8 ohms 1 kHz, THD 10%) FRONT1): 110 W + 110 W CENTER1): 110 W SURR1): 110 W + 110 W SURR BACK1): 110 W + 110 W Models of area code SP, MY Rated Power Output at Stereo Mode (8 ohms 1 kHz, THD 0.7%) 90 W + 90 W2) Reference Power Output2) (8 ohms 1 kHz, THD 0.7%) FRONT1): 90 W + 90 W CENTER1): 90 W SURR1): 90 W + 90 W SURR BACK1): 90 W + 90 W 1) Depending on the sound field settings and the source, there may be no sound output. 2) Measured under the following conditions: 3) Measured under the following conditions: Area codePower requirements AEP, UK, SP, MY, KR230 V AC, 50 Hz AUS240 V AC, 50 Hz TW110 V AC, 60 Hz Area codePower requirements KR220 V AC, 50 Hz Frequency response Inputs (Analog) PHONORIAA equalization curve 0.5 dB MULTI CH IN, SA-CD/ CD, MD/TAPE, DVD, TV/SAT, VIDEO 1, 2, 3 10 Hz 100 kHz +0.5/2 dB (when ANALOG DIRECT is selected) PHONOSensitivity: 2.5 mV Impedance: 50 kilohms S/N3): 86 dB (A, 2.5 mV4) MULTI CH IN, SA-CD/ CD, MD/TAPE, DVD, TV/SAT, VIDEO 1, 2, 3 Sensitivity: 150 mV Impedance: 50 kilohms S/N4): 96 dB (A, 150 mV5) RadioFans.CN 收音机爱 好者资料库 2 STR-DB795 4) INPUT SHORT. 5) Weighted network, input level. Inputs (Digital) Outputs EQ FM tuner section Tuning range87.5 - 108.0 MHz AntennaFM wire antenna Antenna terminals75 ohms, unbalanced Intermediate frequency10.7 MHz Sensitivity Mono:18.3 dBf, 2.2 V/75 ohms Stereo:38.3 dBf, 22.5 V/75 ohms Useable sensitivity11.2 dBf, 1 V/75 ohms S/N Mono: 76 dB Stereo: 70 dB Harmonic distortion at 1 kHz Mono: 0.3% Stereo: 0.5% Separation45 dB at 1 kHz Frequency response30 Hz 15 kHz, +0.5/2 dB Selectivity60 dB at 400 kHz AM tuner section Tuning range Models of area code AEP, UK, SP, MY, TW, KR, AUS With 9-kHz tuning scale531 1,602 kHz AntennaLoop antenna Intermediate frequency450 kHz Usable sensitivity50 dB/m (at 1,000 kHz or 999 kHz) S/N54 dB (at 50 mV/m) Harmonic distortion0.5% (50 mV/m, 400 Hz) Selectivity At 9 kHz:35 dB Video section Inputs/Outputs Video:1 Vp-p, 75 ohms S-video:Y: 1 Vp-p, 75 ohms C: 0.286 Vp-p, 75 ohms COMPONENT VIDEO:Y: 1 Vp-p, 75 ohms B-Y: 0.7 Vp-p, 75 ohms R-Y: 0.7 Vp-p, 75 ohms 80 MHz HD Pass Through General Power requirements DVD (Coaxial)Impedance: 75 ohms S/N: 100 dB (A, 20 kHz LPF) DVD, TV/SAT, MD, VIDEO3 (Optical) S/N: 100 dB (A, 20 kHz LPF) MD/TAPE (REC OUT), VIDEO 1, 2 (AUDIO OUT) Voltage: 150 mV Impedance: 2.2 kilohms SUB WOOFERVoltage: 2 V Impedance: 1 kilohms Gain levels10 dB, 1 dB step Area codePower requirements AEP, UK230 V AC, 50/60 Hz AUS240 V AC, 50 Hz SP, MY220230 V AC, 50/60 Hz TW110 V AC, 60 Hz KR220230 V AC, 50/60 Hz Power consumption Power consumption (during standby mode) 0.3 W (when “POWER SAVE” in the CUSTOMIZE menu is set to “ON”) Dimensions430 161 400 mm including projecting parts and controls Mass (Approx.)14.5 kg Supplied accessories FM wire antenna (1) AM loop antenna (1) Remote commander RM-PP413 (1) R6 (size-AA) batteries (2) Design and specifications are subject to change without notice. Area codePower consumption AEP, UK, SP, MY, KR, AUS 270 W TW650 W Abbreviation AUS : Australian model KR: Korean model MY: Malaysia model SP: Singapore model TW: Taiwan model RadioFans.CN 收音机爱 好者资料库 3 STR-DB795 SAFETY CHECK-OUT After correcting the original service problem, perform the following safety check before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes.). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suitable. (See Fig. A) Fig. A.Using an AC voltmeter to check AC leakage. 1.5 k0.15 F AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. SAFETY-RELATED COMPONENT WARNING! 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. RadioFans.CN 收音机爱 好者资料库 4 STR-DB795 TABLE OF CONTENTS 7.EXPLODED VIEWS 7-1.Case Section . 68 7-2.Chassis Section-1 . 69 7-3.Chassis Section-2 . 70 7-4.Main Block Section . 71 7-5.MAIN Board Block . 72 7-6.Chassis Section-3 . 73 7-7.Front Panel Block-1. 74 7-8.Front Panel Block-2. 75 7-9.Front Panel Block-3. 76 8.ELECTRICAL PARTS LIST. 77 1.SERVICING NOTES.5 2.GENERAL.7 3.DISASSEMBLY 3-1.Disassembly Flow .9 3-2.Case (414535). 10 3-3.COMP-V Board. 10 3-4.Back Panel Block . 11 3-5.Main Block . 11 3-6.DIGITAL Board . 12 3-7.STAY 3/STAY 4/SP-B/SP-A/S-VIDEO/VIDEO/ VIDEO-AU/AU-IN Board. 12 3-8.MAIN board . 13 4.TEST MODE. 14 5.ELECTRICAL ADJUSTMENTS. 15 6.DIAGRAMS 6-1.Block Diagram TUNER/VIDEO Section . 17 6-2.Block Diagram AUDIO DSP Section . 18 6-3.Block Diagram AUDIO CONTROL Section . 19 6-4.Block Diagram AUDIO AMP Section . 20 6-5.Block Diagram DISPLAY/KEY CONTROL Section . 21 6-6.Block Diagram POWER SUPPLY Section . 22 6-7.Printed Wiring Board DIGITAL Section (1/2) . 24 6-8.Printed Wiring Board DIGITAL Section (2/2) . 25 6-9.Schematic Diagram DIGITAL Section (1/4) . 26 6-10. Schematic Diagram DIGITAL Section (2/4) . 27 6-11. Schematic Diagram DIGITAL Section (3/4) . 28 6-12. Schematic Diagram DIGITAL Section (4/4) . 29 6-13. Printed Wiring Boards VIDEO Section . 30 6-14. Schematic Diagram VIDEO Section . 31 6-15. Printed Wiring Boards S-VIDEO Section . 32 6-16. Schematic Diagram S-VIDEO Section . 33 6-17. Printed Wiring Board COMP-V Section . 34 6-18. Schematic Diagram COMP-V Section . 35 6-19. Printed Wiring Board AU-IN Section . 36 6-20. Schematic Diagram AU-IN Section . 37 6-21. Printed Wiring Board MAIN Section . 38 6-22. Schematic Diagram MAIN Section (1/3) . 39 6-23. Schematic Diagram MAIN Section (2/3) . 40 6-24. Schematic Diagram MAIN Section (3/3) . 41 6-25. Printed Wiring Board A CLASS Section . 42 6-26. Schematic Diagram A CLASS Section . 43 6-27. Printed Wiring Board SBL Section . 44 6-28. Schematic Diagram SBL Section . 45 6-29. Printed Wiring Board SP Section . 46 6-30. Schematic Diagram SP Section . 47 6-31. Printed Wiring Boards DISPLAY Section . 48 6-32. Schematic Diagram DISPLAY Section . 49 6-33. Printed Wiring Boards DC Section . 50 6-34. Schematic Diagram DC Section . 51 6-35. Printed Wiring Boards AC Section . 52 6-36. Schematic Diagram AC Section . 53 5 STR-DB795 MODEL IDENTIFICATION Back Panel PART No. ModelPART No. AEP and UK models4-050-932-0 Singapore and Malaysia models4-050-932-2 Australian model4-050-932-3 Taiwan model4-050-932-4 Korean model4-050-932-5 UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the lead- free mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size) : LEAD FREE MARK Unleaded solder has the following characteristics. Unleaded solder melts at a temperature about 40 C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder. SECTION 1 SERVICING NOTES 6 STR-DB795 SERVICE POSITION Connecting the clip for GND When checking without back panel, it is necessary to connect the clip for GND to a chassis. clip AU-IN board (JW101) It is necessary to remove cord bushing from back panel. 7 STR-DB795 SECTION 2 GENERAL This section is extracted from instruction manual. Main unit A.F.D. qg DIRECT q; DISPLAY 7 Display 5 INPUT MODE 8 INPUT SELECTOR qs IR receptor 1 MAIN MENU 3 MASTER VOLUME /+ 9 MEMORY/ENTER 4 MENU ws MOVIE qf MULTI CHANNEL DECODING indicator 6 MULTI CH IN qa MUSIC qd PHONES jack wd PRESET TUNING /+ ql SPEAKERS (OFF/A/B/A+B) wf SURR BACK DECODING qj TUNING /+ qk VIDEO 3 INPUT jacks wa ALPHABETICAL ORDER 2CH qh /+ w; ?/1 (power) 2 NUMBERS AND SYMBOLS 289653471 wawfwdwsw;qkqj qh qg qf qdqsq;qaql HX Mm . - VIDEO1VIDEO2 RM SET UP SYSTEM STANDBY SLEEP AV1AV2 TV ?/1AV ?/1 VIDEO3DVD TV/SATMD/TAPE SA-CD/CDTUNER PHONOAUXMULTI CHSOURCE SHIFT TOP MENU/ GUIDE AV MENU MUTING MASTER VOL DISPLAY TV VOLTV CH WIDEDIMMER TV/ VIDEO MAIN MENU RETURN/EXIT D.TUNINGDISCALT ANTCLEARSEARCH MODE 2CHA.F.D. 123 456 789 0/1010/1112 MOVIE SUBTITLEENTER MUSIC AUDIOANGLE JUMP/ TIME PRESET/ CH/D.SKIP TEST TONE SB DECODINGDIRECT DUAL MONO x ?/1 P O v V bB v V bB 1 2 9 qa 5 3 4 6 7 8 q; qs qd qf qg qh qj qk w; ws wd wf wg wa wh ql ENTER The tables below show the settings of each button. Remote Button OperationsFunction A.F.D. wdReceiverSelects the decoding mode for audio sound. ALT 9RemoteWhen ALT button lights up, it changes the remote key function to activate those buttons with orange printing. ANGLE w; DVD playerSelects viewing angle or changes the angles. ANT qlVCRSelects output signal from the antenna terminal: TV signal or VCR program. AUDIO wa TV/VCR/ DVD player Changes the sound to Multiplex, Bilingual or Multi channel TV Sound. AUX wfReceiverTo listen to an audio equipment. AV MENU qj VCR/ Satellite tuner/ DVD player Displays menu. AV1 and AV2 wh RemoteSelects the command mode of the remote. AV ?/1 1 TV/VCR/ CD player/ VCD player/ LD player/ DVD player/ MD deck/ DAT deck Turns the audio and video components on or off. CLEAR qk CD player/ DVD player Clears a mistake when you press the incorrect numeric buttons or returns to continuos playback etc. DIMMER qf ReceiverAdjusts the brightness of the display. DIRECT ws ReceiverSelects 2CH ANALOG DIRECT. DISC q;CD player/ VCD player Selects a disc directly (multi-disc changer only). Remote Button OperationsFunction DISPLAY qg TV/VCR/ VCD player/ LD player/ DVD player Selects information displayed on the TV screen. D.TUNING qk ReceiverEnters direct tuning mode. DUAL MONO 6 ReceiverSelects the language you want during digital broadcast. DVD 2ReceiverTo watch DVD. ENTER 8TV/VCR/ satellite tuner/ LD player/ MD deck/ DAT deck/ Tape deck After selecting a channel, disc or track using the numeric buttons, press to enter the value. ENTER qhReceiver/ VCR/ Satellite tuner/ DVD player Enters the selection. JUMP/TIME 7 Satellite tuner Toggles between the previous and the current channels. CD player/ MD deck/ VCD player/ DVD player Shows the time or displays the playing time of disc, etc. MAIN MENU qd ReceiverSelects the menu of the receiver. MASTER VOL +/ qs ReceiverAdjusts the master volume of the receiver. MD/TAPE wg ReceiverTo listen to Minidisc or audio tape. MOVIE 4ReceiverSelects the pre- programmed sound fields for movie. MULTI CH 3 ReceiverSelects MULTI CH IN source. MUSIC 5ReceiverSelects the pre- progr