Rotel-RT955-tun-sm 维修电路原理图.pdf

T echnicalManual AM/FM STEREO TUNERRT-955Table of ContentsSpecificationSpecification.1Parts List.25Adjustment.612PCB Assembly.1315Schematic Diagram .1622FM TunerUsable Sensitivity: 12.2 dBf 50dB Quieting Sensitivity: 20.2 dBf (mono) 45.3 dBf (stereo)Signal to Noise Ratio (at 65 dBf):75 dBf (mono)72 dBf (stereo) Harmonic Distortion (at 65 dBf):0.2 % (mono)0.3 % (stereo)Frequency Response: 10 Hz - 15 kHz, 3 dBCapture Ratio:2.0 dBAlternate Channel Selectivity:47 dB ( 400 KHz)Spurious Response Ratio:90 dBImage Rejection Ratio:80 dBIF Rejection Ratio:80 dBAM Suppression Ratio:55 dBStereo Separation (100Hz/1 KHz/10 KHz):40 dB/45 dB/35 dBOutput level:1.2VAntenna Input:75 ohms unbalancedAM TunerUsable Sensitivity: 300 V/mSelectivity:25 dBHarmonic Distortion :0.5 %Image Rejection Ratio:45 dBSignal to Noise Ratio:48 dBOutput level:165 mVAntenna Input:Loop AntennaGeneralPower Consumption:10 WattsPower Requirements (AC):120 volts, 60 Hz (USA version)230 volts, 50 Hz (European version)Weight: 3.7 kg/8.2 lb.Dimensions (W x H x D): 440 x 72 x 286 mm173/8 x 27/8 x 111/4SHINSEN-BLD. 4F 10-10 SHINSEN-CHO, SHIBUYA-KU,TOKYO 150-0045, JAPANSerial. NO.BeginningQuality UncompromisedY-329A-00065C/S-SRadioFans.CN 收音机爱 好者资料库2Parts List-1ANT200ANT201C201.202C203C204C205.206C207-210C211.212C213C214C215C216C217C218C219C221C222C223-236C237C238-241C242C243C245.246C247C248C249C250.251C252C253C254C255C257C259C260C261C262C263C264.265C266C267C268.269C270C271C272C273C274C275C276C278.279C280C281C282-284C285C301C302X-1273-01 PCB ASSEMBLYANTENNA TERMINAL 1PANTENNA TERMINAL 3P0.01UF0.022UF100UF/16V33PF-CH1000PF0.022UF0.01UF3.3UF/50V0.022UF100UF/16V0.022UF47UF/16V0.022UF0.022UF47UF/16V0.022UF100PF0.047UF150PF0.022UF0.022UF1UF/50V0.022UF1UF/50V0.022UF100UF/16V0.022UF1UF/50V0.047UF0.022UF0.047UF680PF0.47UF/50V1UF/50V0.047UF1UF/50V0.01UF0.022UF0.47UF/50V4.7UF/50V0.047UF0.01UF0.022UF10UF/50V68PF330PF10UF/50V270PF33UF/35V100UF/16V0.022UF470PF-POLY18PF-CHANTENNA-AANTENNA-BCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITOR(CH TYPE)CERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORFILM CAPACITORCERAMIC CAPACITOR(CH TYPE)C304C306-308C309C311.312C313C314C316C317C318C319C321C322C323.324C325C326C327C328C329C330C401C402-404C405.406C407.408C409C411C412C413C414C415.416C417C501C502C503C504C505C506.507C508C509C511C512C513.514C515C516CL201.202CL203CL204CL271CL273CL277CR201.202CR203CR204CR271CR273CR2770.047UF0.022UF220PF0.022UF47UF/16V0.022UF1000PF0.047UF-M0.056UF-M0.022UF100UF/16V0.01UF0.022UF3.3UF/50V4.7UF/50V1UF/50V470PF0.047UF0.022UF-M0.022UF47UF/16V0.0033UF0.01UF10UF/50V4.7UF/50V10UF/50V4.7UF/50V0.022UF-M0.0033UF-M0.0068UF-M3300UF/35V47UF/50V0.068UF-M4.7UF/50V0.068UF-M0.022UF10UF/50V0.022UF47UF/16V220UF/16V47UF/16V47UF/35V2.2UF/50V22UF/16V0.0039UF-M1000PF270PF120PF100PF22UF/16V0.0039UF-M1000PF270PF120PF100PFCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORMYLAR CAPACITORMYLAR CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORMYLAR CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORMYLAR CAPACITORMYLAR CAPACITORMYLAR CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORMYLAR CAPACITORELECTRIC CAPACITORMYLAR CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORELECTRIC CAPACITORMYLAR CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORMYLAR CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORSYMBOL PARTS NO.DESCRIPTIONSYMBOL PARTS NO.DESCRIPTIONRadioFans.CN 收音机爱 好者资料库3Parts List-2CF201.202CF203CF204CF205CF301D201D202-205D208D209-212D301.302D303-305D307.308D401D501-505D506D507D508D509D510D511F501.502FFE200IC201IC202IC203IC204IC205IC301IC401IC501ICM101J321JACK1JACK2L201-206L207L500LFL200LFR200Q201.202Q204Q206.207Q209Q211Q212Q213-216Q219Q222Q223Q225Q301Q302Q501Q502FM FILTER 10.7MM-AFM FILTER 10.7MJA10-AFM FILTER 10.7MM-ACSB456F11SFPS450H1N40041N4148ZENER 5.1V1N4148KV1236Z1N41481N4148ZENER 5.1V1N4004ZENER 30VZENER 6.2VZENER 12V1N4148ZENER 5.6V1N4004036 5ST500FTA4-460HLC72191MLA1235LA1235LA3450NJM072DELA1245LA2230NJM317FHEAT SINK(24X17X30)LTV8174.7KMINI JACKRCA 2P56UH20.8MH56UHKLM5B2-TKLM5B2-TKTC3198YDTA114YDTA114Y2SC1740S2SC1740S2SK192GRKTC3195YKTC3198YDTC114Y2SK117DTA114Y2SK192GRDTA114YDTC114YBKTA1267YFM IF CERAMIC FILTERFM IF CERAMIC FILTERFM IF CERAMIC FILTERCERAMIC RESONATORFILTER FOR AMSWITCHING DIODESWITCHING DIODEZENER DIODESWITCHING DIODEVARACTOR DIODESWITCHING DIODESWITCHING DIODEZENER DIODESWITCHING DIODEZENER DIODEZENER DIODEZENER DIODESWITCHING DIODEZENER DIODESWITCHING DIODEMINI FUSE 250V T500MAFM FRONT-ENDPLL ICSIGNAL METER ICFM IF ICMPX ICDUAL OP AMPAM IF ICRDS ICREGULATOR ICREG.IC HEAT SINKERPHOTO COUPLER ICRESISTOR 5%MULTI-ROOM JACKRCA JACKINDUCTORFTZ COILINDUCTORMPX LPF COILMPX LPF COILTRANSISTORTRANSISTORTRANSISTORTRANSISTORTRANSISTORFETTRANSISTORTRANSISTORTRANSISTORFETTRANSISTORFETTRANSISTORTRANSISTORTRANSISTORQ503Q504Q505Q506QL201QR201R201R202R203.204R205R207.208R211-213R214-218R222R223R224R225R226R231.232R233R236R238R239R240R241R242R243R244R245R246R247R248R249R250R257.258R259R260R261R262R263R264R265.266R271R272.273R274R275R276R277R278R279R281R282R283R284.285R286KTC3198YDTC114YDTA114YKTC3198YKTD1303KTD13034.7K82R100K1K100K220R1K220R560R10K5.6K330R220R1K330R27K330R150R470R330R15K390R6.8K3.3K22R390R330R4.7K330R6.8K3.3K39R390R330R4.7K330R330R100K18K47K1K10R(1W)10K3.3K18K1K10K120K3.3KTRANSISTORTRANSISTORTRANSISTORTRANSISTORTRANSISTORTRANSISTORRESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%WATT RESISTORRESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%SYMBOL PARTS NO.DESCRIPTIONSYMBOL PARTS NO.DESCRIPTION4Parts List-3R288R289R291.292R297R298R299R300R301.302R303R304R305R306.307R308R309R311R312R313R314R316.317R318R319R320R321R401.402R403R404R405R406R407R408R409R410R411R412R413R501R502R503R504R505R506R507R508R509R511R513R514R515R516R517R518R519R520RL201RL2025.6K10K100K4.7K22R1M1.5K100K100R820R470R220R10K100K100R1K4.7K2K220R82R10K100K10K560R680R1K3M1K5.6K3.3K10K3M33K10K22K4.7K10K82R270R200R1.8K330R(1W)10K270R(1W)1K22K10K100R12K10K4.7K56K47K3.3K6.8KRESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%WATT RESISTORRESISTOR 5%WATT RESISTORRESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RL203RL204RL205RL206RL294RL295RM101RR201RR202RR203RR204RR205RR206RR294RR295RLY201.202TC301TC302TL201TL202TL301TL302TL303TL304VR201VR203VR204VR205VR206VR301VR401XTL201XTL401C101-107C110.111C112C113C114.115C116C117C118C119C121D101-107D118ENC101FL101Q101R101-135R136R137-143R146-149R150.1518.2K470R100K3.3K180K100K270R3.3K6.8K8.2K470R100K3.3K180K100KG5A-237P DC12VTRIMER 10P(WHITE)TRIMER 20P(RED)FM-DET-AFM-DET-BAM-OSC1AM-ANT2AM-IFT1AM-IFT2VR.47KVR.22KVR.1MVR.470KVR.4.7KVR.22KVR.10KXTAL 7.2MHZCSB456F15X-1273-02 PCB ASSEMBLY100PF0.047UF22UF/16V(SE TYPE)0.1UF820PF0.1UF820PF1000PF100PF0.1UF1N41481N4148EC16B24202SVR-12MM18(35S/12G)KTC3198Y120K10K1K247K2R2RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RELAYVARIABLE CAPACITORVARIABLE CAPACITORFM DET.COILFM DET.COILAM OSC.COILAM ANT.COILAM IFT COILAM IFT COILVARIABLE RESISTORVARIABLE RESISTORVARIABLE RESISTORVARIABLE RESISTORVARIABLE RESISTORVARIABLE RESISTORVARIABLE RESISTORCRYSTALCERAMIC RESONATORCERAMIC CAPACITORCERAMIC CAPACITORELECTRIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORCERAMIC CAPACITORSWITCHING DIODESWITCHING DIODEVR ENCODERVFD FOR RDS/RBDSTRANSISTORRESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%SYMBOL PARTS NO.DESCRIPTIONSYMBOL PARTS NO.DESCRIPTION5Parts List-4R152R155.156R157R158-163R164SW101-112SW114-116SW118-120SW122-124SW126-128U101U102XT101CM101QM101RM102RM103RM104RMC201C540SW201TF20110K10K47K10K1K2TACT SWITCH(SKHVBH)TACT SWITCH(SKHVBH)TACT SWITCH(SKHVBH)TACT SWITCH(SKHVBH)TACT SWITCH(SKHVBH)CXP82832-182QAT24C16CST10.00MTWX-1273-03 PCB ASSEMBLY10UF/16V(SE TYPE)KTC3198Y100R150R4.7KCRV1M352-00BX-1273-04 PCB ASSEMBLY0.0047UF/400VPOWER SW.TV-5X-1273-05 PCB ASSEMBLY022 T-1065N01RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%RESISTOR 5%TACT SWITCHTACT SWITCHTACT SWITCHTACT SWITCHTACT SWITCHCPUEEP ROMRESONATOR 10.0MHZELECTRIC CAPACITORTRANSISTORRESISTOR 5%RESISTOR 5%RESISTOR 5%REMOTE CONTROL SENSORSPARK KILLER(AC CERAMIC)SWITCHPOWER TRANSFORMERC601-605D601-604IC601JACK3X-1273-06 PCB ASSEMBLY1UF/50VZENER 12VMAX232CPEDB9 JACK(MALE)OTHERS011 FP-504012 SK4-06A00012 4TQF-15014 C-4550A02014 4TQN-12B#5015 RP-360019 4TSH-19#2021 RLA145A00034 SEL1124R069 C-4629A01072 4TR-2489072 4TR-2875072 4TR-3228072 C-4620A01072 C-4622A01072 C-4623A01072 C-4624A01081 SK4-10A00081 TZ-164-1092 RR-T91ELECTRIC CAPACITORZENER DIODERS232 DRIVER ICDB9 JACKFRONT PANEL ASSYKNOB 33FPOWER BUTTON 14X14UPPER COVERBOTTOM BOARDPRINTED REAR CHASSISPLASTIC FOOT 50FAM LOOP ANTENNALEDAC INLET3.5MM PLUG SHIELD CORDRCA PIN CORDT TYPE ANTENNAAC CORD SET for STDAC CORD SET for AUSTRALIAAC CORD SET for UKAC CORD SET for CEEINSIDE CARTONSTYROL SIDE MOULDINGREMOTE UNITSYMBOL PARTS NO.DESCRIPTIONSYMBOL PARTS NO.DESCRIPTIONAdjustment FM* Necessary measurement equipmentRDS/STEREO Multiplexer 1 unitFM/AM Signal Generator 1 unitAudio Signal Analyzer 1 unitOscilloscope 1 unitDigital Volt Meter (DVM) 1 unit(A) Center adjust RDS/STEREO Multiplexer Setting MODE : MONO Audio Frequency : 1KHz FM Signal Generator Setting Deviation : 75KHz Radio Frequency : 98.0MHz Output Level : 66dB RT955 Setting FM Frequency : 98.0MHz Antenna Selection : A FM MODE : MONO IF MODE : WIDE6q Turn FM Signal Generator Modulation onw Connect DVM (+)(-) terminals to both ends of resistor R282 and measure the volt.e Make this measured volt 0 by adjusting TL201(FM-DET-A Coil). (The adjustment should be within 2mV)r After this adjustment, measure THD(Total Harmonic Distortion) with Audio Signal Generator.t Adjust THD to minimum point with TL202(FM-DET-B Coil). (THD should be within 0.5%)OscilloscopeMonitorAudioSignalAnalyzerL-CH(or R-CH)Jack 2Ant-B(ANT 201)Ant-A(ANT 200)FMSignalGeneratorStereoMultiplexerDVM(+)(-)IC 203BACKFRONT(FM-DET-B)TL 202TL 201(FM-DET-A)R 282(B) Channel Separation adjust RDS/STEREO Multiplexer Setting MODE : STEREO (ONLY L-CH Signal OUT) Audio Frequency : 1KHz FM Signal Generator Setting Deviation : 75KHz Radio Frequency : 98.0MHz Output Level : 66dB RT955 Setting FM Frequency : 98.0MHz Antenna Selection : A FM MODE : STEREO IF MODE : WIDE7q Turn FM Signal Generator Modulation on after modulating only L-CH at STEREO Multiplexer.w Confirm if STEREO indicator is turned ON on the display in the WIDE MODE.e Measure output level via Audio Signal Analyzer and make the level as standard.r Turn FM Signal Generator Modulation on after modulating only R-CH at STEREO Multiplexer.t Measure output level via Audio Signal Analyzer (measure per a dB)y Adjust output level to minimum position with VR204 (WIDE MODE CH-SEPA. ADJ.). (lower than -40dB)u Change RT955 IF MODE to NARROW.i Repeat the above qto Adjust output level to minimum point with VR205(NARROW MODE CH-SEPA. ADJ). (lower than -38dB)OscilloscopeMonitorAudioSignalAnalyzerL-CH(or R-CH OPEN)Jack 2Ant-B(ANT 201)Ant-A(ANT 200)SignalGeneratorStereoMultiplexerVR 204(Wide)VR 205(Narrow)IC 204BACKFRONT(C) TUNED Level adjust RDS/STEREO Multiplexer Setting MODE : STEREO Audio Frequency : 1KHz FM Signal Generator Setting Deviation : 75KHz Radio Frequency : 98.0MHz Output Level : 26dB RT955 Setting FM Frequency : 98.0MHz Antenna Selection : A FM MODE : STEREO IF MODE : WIDE8q Turn FM Signal Generator Modulation ON (confirm if output level is 26dB)w measure volt while connecting DVM (-) terminal to GND (or Chassis) & connecting (+) terminal to Jumper J615(S-METER).e Adjust volt to 1.2V with VR201 (FM-ADJ1).r Adjust VR206(FM-ADJ2) up to the moment where STEREO & TUNED indicator turns OFF & ON again. t Confirm if STEREO & TUNED turn OFF when decreasing the output level slowly from 26dB to 25dB, 24dB. (Repeat the above er if not OFF in lower than 24dB.)y Set RT955s Search by MODE to AUTO at Signal Generator Output Level 26dB and start Auto search Tuning Encoder. Confirm if search stops at FM Frequency 98.0MHz. (Examine both of High Freq. 98.0MHz search, Low Freq. 98.0MHz search)OscilloscopeMonitorAudioSignalAnalyzerL-CH(or R-CH)Jack 2Ant-B(ANT 201)Ant-A(ANT 200)SignalGeneratorStereoMultiplexerVR 206(FM-ADJ 2)VR 201(FM-ADJ 1)S-METERCP 201J 615DVM(+)(-)GND(or Chassis)IC 203IC 202BACKFRONT(D) RDS Level adjust RDS/STEREO Multiplexer Setting MODE : STEREO Audio Frequency : 1KHz RDS MODE : ON FM Signal Generator Setting Deviation : 75KHz Radio Frequency : 98.0MHz Output Level : 35dB RT955 Setting FM Frequency : 98.0MHz Antenna Selection : A FM MODE : STEREO IF MODE : WIDE9q Make sure that RDS/STEREO Multiplexer RDS Modulation is ON and turn FM Signal Generator Modulation ONw Connect oscilloscope terminal to low measuring point of C406(RDS ADJ) and measure. Make sure that the following waveform is output.e Adjust waveform to maximum level with VR401(RDS ADJ).r Confirm if RDS indicator is ON.Oscillo