Adcom-GTP502-pre-sm维修电路原理图.pdf
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1、details you can hearSERVICE MANUALSTEREO TUNER PRE-AMPLIFIERGTP-502TABLE OF CONTENTSAdjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14IC Block Diagram . . . . . . . . . . . . . . . . . . . . .15-18Wiring Diagram .
2、 . . . . . . . . . . . . . . . . . . . . .19-20PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . .21-28Schematic Diagram . . . . . . . . . . . . . . . . . . .29-42Technical Specification . . . . . . . . . . . . . . . . .43-4410 TIMBER LANEMARLBORDN.J. 07746, USAPHONE: (732) 683-2356FAX: (73
3、2) 683-2358web: http: /RadioFans.CN 收音机爱 好者资料库2ADJUSTMENTGTP-502Preparation1. INPUT- FM mono:1kHz, 75kHz devi., 60dB/V- FM stereo:1kHz, 67.5kHz devi., 60dB/VPilot signal 19kHz 7.5kHz devi.- AM:400Hz, 30%mod.1. FM ADJUSTMENT2. OUTPUTS- Connect the non-inductive type resistor of 8 ohmsto all speaker t
4、erminals otherwise noted.ItemFMIF/RFStereoDistortionStereoSeparationMutingLevelSignaloutputStep1DC voltmeterL9410100mV3DistortionanalyzerDistortionanalyzerOscilloscopeOscilloscopeL942R956R941MinimumMinimum2AC voltmeterIFT on thefront endIFE on thefront endMaximumMaximumConnectionof instrumentFig.1Fi
5、g.2Fig.2Fig.1Channel Lor R 1kHz99.0MHz1kHz 75kHz devi.65dBf (60dB)99.0MHz Ext.mod. 65dBf(60dB)FM SGoutputStereo mod-ulator outputTuningfrequency99.0MHz99.0MHzChannel Lor R 1kHz99.0MHz Ext.mod. 65dBf(60dB)99.0MHz 1KHz 75KHz devi33dB99.0MHz mod.65dBf(60dB)99.0MHz 18dB99.0MHz99.0MHzPilotSuppressionSign
6、alStrengthIndicatorMinimum8 bars justlitVTVMVFD SignalBarsL903 FOR LL904 FOR RR951Channel L orR pilot onsignalFig.2Fig.199.0MHz99.0MHzOutputindicatorAdjustmentpointAdjustforRemarksFM MUTE/MODEswitch: ON/AUTORepeat the steps1 to 3 until no fur-ther adjustment isnecessary.FM MUTE/MODEswitch: ON/AUTODo
7、nt turn morethan +/-180Repeat stereodistortion andstereo separationalignment untilTHD at minimumand separation atmaximum.Adjust such thatoutput just unmute2. AM ADJUSTMENT120V modelStep123530kHz600kHz990kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz
8、30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock M971OSC coilon RFblock M971Adjustfor1.350.2VMaximumMaximumStep123522kHzor531kHz603kHz999kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDi
9、gitalDCvoltmeterL972OSC coilon RFblock M971OSC coilon RFblock M971Adjustfor1.30.2V (522kHz)1.350.2V (531kHz)MaximumMaximum230V model and worldwide modelsReference SpecificationFM tuned voltage: 87.5MHz108.00MHzMore than 1.2vLess than 10vAM tuned voltage: 530KHz1710KHz1.30.2Less than 9.0vReference Sp
10、ecificationFM tuned voltage: 87.5MHz108.00MHzMore than 1.2vLess than 10vAM tuned voltage: 522KHz1611KHz1.30.2Less than 9.0v(230V model)AM tuned voltage: 531KHz1602KHz1.30.2Less than 9.0v(Worldwide model)RadioFans.CN 收音机爱 好者资料库3ADJUSTMENTGTP-5023. FM MEASUREMENTFig. 1Fig. 24. RDS MEASUREMENTFig. 35.
11、AM MEASUREMENTFig. 46. ADJUSTMENT POINTSFMSINGALGENERATORANTENNATERMINALANTENNATERMINALDISTORTIONANALYZERDISTORTIONANALYZERACVOLTMETEROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEOUTPUTTERMINALOUTPUTTERMINALLRANTENNATERMINALANTENNATERMINALANTENNATERMINALAM LOOPANTENNA(Accessory)AM L
12、OOPANTENNA60cmDIGITALMILLIVOLTMETERVTFMSIGNALGENERATORAMSIGNALGENERATORFMSIGNALGENERATORRDSGENERATOROSCILLO-SCOPETP701FMSTEREOGENERATORTP-141DCMILLIVOLTMETERUNITUNITUNITUNITR951FM SIGNALSTRENGTHFRONT ENDIFTM901L942FM IFL941L972AM IFL903L904R956STEREOSEPARATIONP901R941MUTINGL971OSCRFRadioFans.CN 收音机爱
13、 好者资料库IR ASSEMBLY1200IR ASSEMBLYPCB-A0180C-IRPCB BOARD1201PCB KEYBOARD/RM1/TUNER/MISC1724-670A-0002METAL MATERIAL1202ME 2*8 4.0MM BK/RH JHC023-002954-2008-3000WAFERJ501A5P ST.WAFER P=2.5 COULOMB2102-051S-004JACKS/SOCKETM501DIN 5P 180DEG SOCKET2113-1682-0ROOM 1 ASSEMBLY2200ROOM 1 ASSEMBLYPCB-A0180C-R
14、M1PCB BOARD2201PCB KEYBOARD/RM1/TUNER/MISC1724-670A-0002CAPACITORSC201,C202CC 16V 0.22 20% CM 0805 1.2X2.0150D-224M-J-BDC213,C214CC 50V 100pF 5% 0805 1.2X2.0150F-101J-J-BDC215,C216CE 50V 10F 20% RL 4x7157F-106M-5-GMc217,c218CC 16V 0.47 10% 0805/2012 1.5X2.5150D-474K-J-BDLC219,c220CC 50V 100pF 5% 080
15、5 1.2X2.0150F-101J-J-BDC221,C222CC 50V 22pF 5% 0805 1.2x2.0150F-220J-J-BDC223-C226CE 50V 10F 20% RL 4x7157F-106M-5-GMC227,C228CE 25V 4.7F 20% RL 4x7157E-475M-5-GMC229,C230CM 50V 4700pF 10% RL 5x5153F-472K-5-IIC231-C234CM 50V 0.056F 5% RL7.5X9.5153F-563J-5-NRC236,C236CM 50V 4700pF 10% RL 5x5153F-472K
16、-5-IIC237,C238CP 50V 47pF 5% RL 5.5x10158F-470J-5-JSC241,C242CE 50V 10F 20% RL 4x7157F-106M-5-GMC323,C324CC 16V 0.22 20% CM 0805 1.2X2.0150D-224M-J-BDDIODESD211,D309RLS-73 DIODE4840-1080-3WAFERS/SOCKETSJ131BWAFER 8P P2.5 ST.2102-081S-004J132A6P ST. WAFER P=2.5 COULOMB2102-061S-004J210A,J224A4P ST.WA
17、FER P=2.5 COULOMB2102-041S-004J320ASOCKET (PCB/PCB) 16P P2.0 RA2101-1601-0J321ASOCKET (PCB/PCB) 4P P2.0 RA2101-1671-0J322A,J323A4P ST.WAFER P=2.5 COULOMB2102-041S-004RELAYSM225,M226RELAY V23105-A5303-A201 SIEMENS4500-0920-0TRANSISTORSQ209TR KTC3875Y4853-875Y-3Q210TR KTA1504Y4851-504Y-3Q214,Q215TR 2S
18、C2878 (A,B) RL4860-0770-5Q218,Q219TR 2SD1012F/G HFE 160-5604851-012F-5Q310TR FET J1124860-8770-0Q313,Q314TR 2SC2878 (A,B) RL4860-0770-5RESISTORSR235,R236RMG 1/10W 1K 1% 08054720-102A-JR237,R238RMG 1/10W 56K 1% 08054720-563A-JR239RMG 1/10W 10K 1% 08054720-103A-JR240RMG 1/10W 7.5K 1% 08054720-752A-JR2
19、41,R242RMG 1/10W 15K 5% 08054720-153J-JR243,R244RMG 1/10W 2.2K 1% 08054720-222A-JR245,R246RMG 1/10W 0R 5% 08054720-000J-JR247,R248RMG 1/10W 1M 1% 08054720-105A-JR249,R250RMG 1/10W 3.9K 1% 08054720-392A-J4PARTS LISTGTP-502REF NO.DESCRIPTIONPART NO.RadioFans.CN 收音机爱 好者资料库5PARTS LISTGTP-502R251,R252RMG
20、 1/10W 4.7K 5% 08054720-472J-JR253-R256RMG 1/10W 7.5K 1% 08054720-752A-JR257,R258RMG 1/10W 1K 1% 08054720-102A-JR259RMG 1/10W 220K 5% 08054720-224J-JR260RMG 1/10W 680K 5% 08054720-684J-JR261-R264RMG 1/10W 6.8K 1% 08054720-682A-JR265-R268RMG 1/10W 1K 1% 08054720-102A-JR269,R270RMG 1/10W 6.8K 1% 08054
21、720-682A-JR271,R272RMG 1/10W 100R 1% 08054720-101A-JR273,R274RMG 1/10W 220K 1% 08054720-224A-JR275,R276RMG 1/10W 10K 5% 08054720-103J-JR277-R279RMG 1/10W 0R 5% 08054720-000J-JR280RMG 1/10W 220K 5% 08054720-224J-JR281,R282RMG 1/10W 10K 5% 08054720-103J-JR283RMG 1/10W 680K 5% 08054720-684J-JR284,R285R
22、MG 1/10W 220K 5% 08054720-224J-JR286,R287RMG 1/10W 0R 5% 08054720-000J-JR295,R296RMG 1/10W 1.2K 5% 08054720-122J-JR297RMG 1/10W 10K 5% 08054720-103J-JR298,R299,R322RMG 1/10W 100K 5% 08054720-104J-JR323RMG 1/10W 10M 5% 08054720-106J-JR365RMG 1/10W 10K 5% 08054720-103J-JR366,R367RMG 1/10W 100R 1% 0805
23、4720-101A-JR368RMG 1/10W 10K 5% 08054720-103J-JR451,R452RMG 1/10W 2.2K 5% 08054720-222J-JR455RCF 1/4W 150R 5% AT4705-151J-2R801-R816RMG 1/10W 1.2K 1% 08054720-122A-JR817-R832RMG 1/10W 3.3K 1% 08054720-332A-JR833-R848RMG 1/10W 1.2K 1% 08054720-122A-JR849-R864RMG 1/10W 3.3K 1% 08054720-332A-JR865,R866
24、RMG 1/10W 1.2K 1% 08054720-122A-JR867,R868RMG 1/10W 3.3K 1% 08054720-332A-JR869,R870RMG 1/10W 1.2K 1% 08054720-122A-JR871,R872RMG 1/10W 3.3K 1% 08054720-332A-JR873,R874RMG 1/10W 100R 1% 08054720-101A-JR875,R876RMG 1/10W 22K 1% 08054720-223A-JR877RMG 1/10W 10K 1% 08054720-103A-JR878RMG 1/10W 7.5K 1%
25、08054720-752A-JICsU202-U205IC 7AA HIGH SPEED OP AMP3130-7430-0U206,U207IC TC9273F-004 ANALOGUE SWITCH (FLAT-PACK)3131-6790-0U307,U333IC TC9273F-004 ANALOGUE SWITCH (FLAT-PACK)3131-6790-0KEYBOARD ASSEMBLY*USKEYBOARD ASSEMBLYPCB-A0180C-KEY*CEKEYBOARD ASSEMBLYPCB-A0181C-KEYMETAL MATERIALS1101HOLDER LED
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