Sony-STRDE425-rec-sm 维修电路原理图.pdf
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1、STR-DE425US ModelCanadian ModelAEP ModelUK ModelE ModelAustralian ModelChinese ModelSERVICE MANUALFM STEREO/FM-AM RECEIVERManufactured under license from Dolby LaboratoriesLicensing Corporation.“DOLBY”, “PRO LOGIC” and the double-D symbol aretrademarks of Dolby Laboratories Licensing Corporation.MIC
2、ROFILMSPECIFICATIONSAmplifier sectionPower outputStereo mode(DIN 1 kHz, 4 ohms)90 W + 90 WSurround(DIN 1 kHz, 4 ohms)modeFront: 90W/chCentre: 90W(only in PRO LOG IC MODE)REAR: (DIN 1 kHZ, 8ohms) 45 W/ch5.1/DVDFront: 90 W/chINPUT * mode(DIN 1 kHz, 4 ohms)Centre: 90 W (DIN 1 kHz, 4 ohms)Rear: 45 W/ch
3、(DIN 1 kHz, 8 ohms)FrequencyPHONO: RIAAresponseequalization curve 0.5 dBTV / LD, CD, TAPE / MD,VIDEO, 5.1/DVD INPUT:10Hz - 50kHz 1dBInputSensitivity Impedance S/N(Weightingnetwork,input level)PHONO2.5mV5074 dB(MM)kilohms72 dB*(A, 2.5 mV)CD,5.1/DVD200 mVINPUT*5082 dBTAPE/MD,kilohms82 dB*TV/LD,150 mV(
4、A, 150 mV)VIDEO*78IHFOutputsTAPE/MD REC OUT:Voltage: 150 mV,Impedance: 10 kilohmsVIDEO AUDIO OUT:Voltage: 150 mV,Impedance: 10 kilohmsWOOFER/MIX AUDIOOUT: Voltage: 2VImpedance: 10 kilohmsPHONES: Accepts low and highimpedance headphonesMutingFull muteBASS BOOST+10dB at 70 HzTONE8dB at 100 Hz and 10 k
5、HzFM tuner sectionTuning range87.5 108.0 MHzAerial terminals75 ohms, unbalancedSensitivityMono: 18.3 dBf, 2.2V /75 ohmsStereo: 38.3 dBf, 22.5V /75 ohmsUsable sensitivity11.2 dBf, 1V /75 ohms (IHF)S/NMono: 76 dBStereo: 70dBHarmonicMono: 0.3 %distortion atStereo: 0.5 %1 kHzSeparation45dB at 1 kHzFrequ
6、ency30 Hz 15kHz +0.5 dBresponseSelectivity60 dB at 400 kHz2 Continued on next page AM tuner sectionTuning range531 1602 kHzAerialLoop aerialUsable sensitivity50 dB/m (at 999 kHz)S/N54 dB(at 50 mV/m)Harmonic0.5%(50 mV/m, 400Hz)distortionSelectivity35 dBVideo sectionInputVIDEO 1, 2, TV:1 Vp-p 75 ohmsO
7、utputVIDEO 1, 2, MONITOR:1 Vp-p 75 ohmsGeneralSystemTuner section; PLLquartz-locked digitalsynthesizer systemPreamplifier section:Low-noise NF typeepualizerPower amplifier section:Pure-complimentarySEPPPower230 V AC, 50/60 HzrequirementsPower230 WconsumptionAC outletsSwitched 100 W(except for the U.
8、K.model)RadioFans.CN 收音机爱 好者资料库 2 1.GENERAL 32.TEST MODE43.DIAGRAMS3-1.Circuit Boards Location 53-2.Block Diagram 73-3.Schematic Diagram Display Section 93-4.Printed Wiring Board Display Section 113-5.Schematic Diagram Power Section 133-6.Printed Wiring Board Power Section 153-7.Printed Wiring Board
9、 Main Section 173-8.Schematic Diagram Main Section (1/3) 193-9.Schematic Diagram Main Section (2/3) 213-10. Schematic Diagram Main Section (3/3) 233-11. IC Pin Function Description253-12. IC Block Diagrams 274.EXPLODED VIEWS4-1.Front Panel Section 294-2.Chassis Section305.ELECTRICAL PARTS LIST31TABL
10、E OF CONTENTS After correcting the original service problem, perform thefollowing safety checks 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 asdescribed below.LEAKAGE The A
11、C leakage from any exposed metal part to earth ground andfrom all exposed metal parts to any exposed metal part having areturn to chassis, must not exceed 0.5 mA (500 microampers).Leakage current can be measured by any one of three methods.1.A commercial leakage tester, such as the Simpson 229 or RC
12、AWT-540A. Follow the manufacturers instructions to use theseinstruments.2.A battery-operated AC milliammeter. The Data Precision 245digital multimeter is suitable for this job.3.Measuring the voltage drop across a resistor by means of aVOM or battery-operated AC voltmeter. The “limit” indicationis 0
13、.75 V, so analog meters must have an accurate low-voltagescale. The Simpson 250 and Sanwa SH-63Trd are examples ofa passive VOM that is suitable. Nearly all battery operateddigital multimeters that have a 2V AC range are suitable. (SeeFig. A)SAFETY CHECK-OUTTo Exposed Metal Parts on Set0.15 F1.5 kAC
14、Voltmeter(0.75 V)Earth GroundFig. A. Using an AC voltmeter to check AC leakage.SAFETY-RELATED COMPONENT WARNING!COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITHMARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTSLIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESECOMPONENTS WITH SONY PARTS WHOSE PART
15、NUMBERSAPPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTSPUBLISHED BY SONY.ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT!LES COMPOSANTS IDENTIFS PAR UNE MARQUE ! SUR LESDIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONTCRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NEREMPLACER CES COMPOSANTS QUE PAR DES
16、PISES SONYDONT LES NUMROS SONT DONNS DANS CE MANUEL OUDANS LES SUPPMENTS PUBLIS PAR SONY.Dimensions430 145 295 mmMass(Approx.)STR-DE425: 7.9 kgSuppliedFM wire aerial (1)accessoriesAM loop aerial (1)Remote controller (remote) (1)Size AA (R6) batteries (2)Design and specifications are subject to chang
17、e without notice.Specifications indicated are measured at 230 VAC, 50 HzRadioFans.CN 收音机爱 好者资料库 3 SECTION 1GENERAL12356789!?!?!?!?!?!?!?!?!?!?#?#?4123457869!?!?!?!?!?!?1 POWER switch (I/u)2 CENTER LEVEL +, buttons3 REAR LEVEL +, buttons4 PRO LOGIC, C.STUDIO, HALL indicators5 5.1/DVD INPUT, BASS BOOS
18、T indicators6 MASTER VOLUME control7 BALANCE control8 TREBLE control9 BASS control! MUTING button/indicator! SURROUND ON/OFF button! SURROUND EFFECT/DELAY, MODE buttons! SET UP, 5.1/DVD INPUT, BASS BOOST buttons! TV/LD button! TAPE/MD button! PHONO button! TUNER button! CD button! VIDEO button Numer
19、ic buttons DIRECT TUNING, SHIFT buttons CHARACTER, DISPLAY buttons MEMORY button FM/AM button PRESET/CHARACTER +, buttons FM MODE button SLEEP button TUNING/PTY SELECT +, buttons RDS PTY, EON buttons# PHONES jack# SPEAKERS A, B ON/OFF buttons1 ANTENNA (FM/AM)2 5.1/DVD INPUT3 y SIGNAL GND4 MONITOR5 W
20、OOFER6 FRONT SPEAKERS (A/B)7 AC OUTLET8 AC power cord9 SURROUND SPEAKERS (CENTER)0 SURROUND SPEAKERS (REAR)! VIDEO! TV/LD! TAPE/MD! CD! PHONOLOCATION AND FUNCTION OF CONTROLSFRONT PANELREAR PANEL 4 SECTION 2TEST MODEINITIALIZATION MODE* All preset contents are cleared when this mode is activated. Us
21、ethis mode before returning the product to clients upon completionof repair.* Procedure:While depressing the VIDEO and the TAPE/MD buttonssimultaneously, press the power I/u button to turn on the mainpower. The message INITIAL appears and initialization isperformed.FLUORESCENT INDICATOR TUBE TEST MO
22、DE* All fluorescent segments are tested. When this test is activated,all segments turn on at the same time, then each segment turns onone after another.* Procedure:While depressing the TV/LD and the BASS BOOST buttonssimultaneously, press the power I/u button to turn on the mainpower. All segments t
23、urn on at the same time, then each segmentturns on one after another. The message FINISH appears when thistest is complete.AUTO-BETICAL CHECK MODE* To auto-scanning FM board and memorise RDS station. (FM/RDS model only)* Procedure:While depressing the MEMORY button, press the power I/ubutton to turn
24、 on the main power. The message AUTO BET appearsand each function is selected one after another.AM CHANNEL STEP 9 kHz/10 kHzSELECTION MODE* Either the 9 kHz step or 10 kHz step can be selected for the AMchannel step. (US, CND and E model only)* Procedure:Set the FUNCTION to AM. Turn off the main pow
25、er.While depressing the TUNING+ button, press the power I/u buttonto turn on the main power. Either the message 9k STEP or 10kSTEP appears. Select the desired step.REAR SPEAKER GAIN UP MODE* The rear speaker gain can be set to either NORMAL or GAIN UP.* Procedure:While depressing the -SURROUND- MODE
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