Arcam-T51-tun-sm(1)维修电路原理图.pdf

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1、T51DiVA T51 AM/FM TunerService Manual ARCAMIssue 1.0RadioFans.CN 收音机爱 好者资料库 Contents List ! Contents list ! Circuit description ! Circuit diagrams ! Component overlays ! Circuit board parts list ! General assembly parts list RadioFans.CN 收音机爱 好者资料库T51 Tuner Circuit Description Power Supply Mains vol

2、tage selection is made by placing a fuse, of appropriate value, in the 115V or 230V position. The single secondary is rectified and regulated and supplies four regulators. Z7 is always powered when the mains is connected and keeps the preset memory of the micro controller intact. The high-value capa

3、citor (C84) will keep this data safe, for a limited time, in case of mains power failure. Z5 provides the main 12V supply rail for the RF and audio circuits. This is always connected, except for the supply to the FM front end, which is disabled by Q2 when the unit is turned off. Z4 powers the LED ba

4、ck light on the display PCB. Z6 is the 5V digital supply for the micro controller. FM Tuner & IF The FM aerial input is mixed in the front end FE1 which provides a 10.7MHz IF output. This is filtered and amplified by ceramic filters CF1 & CF2 and the circuit based around Q9 & Q10. A third filter CF3

5、 can be put in circuit by fitting jumpers JP1 & JP2 across pins 2 & 4 and 1 & 3 of SK6 respectively. This effectively narrows the IF band to improve selectivity. Transistors Q17 and Q21 are part of the AGC circuit. The position of the jumper link JP7 to either SK10 or SK11 determines from which poin

6、t the AGC circuit is triggered. The default is for the jumper to be fitted to SK10 which minimizes cross modulation and prevents the IF amp becoming saturated. The LA1266 (Z9) demodulates the IF at pin 1 into an audio output at pin 12. The quadrature coil is a double-tuned device for best distortion

7、 performance. When a station is tuned correctly the On Tune signal goes low and drives a green LED on the display PCB. This signal is also used by the auto-stop detection and muting circuits. AM Tuner & IF The LA1266 (Z9) contains the AM RF amplifier, oscillator and mixer circuitry. Switching betwee

8、n FM and AM modes is controlled by the FM signal from the micro controller which disables the AM circuitry of Z9 and switches the path of the audio signal through Z8. MW/LW switching is performed by switching transistors Q12, Q14 & Q15. Each band has its own oscillator and aerial tuning coils, tuned

9、 by a varicap diode all contained within the AM module L5. The 450kHz IF signal is filtered by coil and ceramic filter combination T5. Birdie Filter The Birdie Filter (L2) is a four pole low pass filter, flat to about 53kHz, then with a very steep roll off from then on. This is designed to reduce co

10、-channel interference in FM Stereo and cut down on irritating birdie noises. Stereo Decoder Stereo decoding is performed by LA3401 (Z8). The 38kHz reference signal is accurately created by ceramic resonator X3 and does not require adjustment. Stereo separation is adjusted for maximum by preset RV1.

11、This IC also contains FM/AM audio switching and muting functions. Audio Filters & Output The left and right channel audio outputs from Z8 are filtered by the de-emphasis network of R1, C1 etc. The correct de-emphasis network is selected by the position of jumpers JP3 & JP4 on the pins of SK8. C2 & C

12、102 (220pF) are selected for 50us and C3 & C103 (560pF) for 75us de-emphasis. The final filter, based on Z3, is a two-pole low-pass circuit with a cut-off frequency of around 20kHz. Also included is a 19kHz notch filter, L1 & C4, that removes most of the residual pilot tone. Muting When the power sw

13、itch is turned off Q5 is switched off, enabling the mute circuitry of the stereo decoder (Z8) via diode D9. This removes the need for output muting transistors and eliminates switching clicks and pops. At switch-on the mute is enabled while C21 is charged via Z8. In normal use the mute inside Z8 is

14、enabled in three other ways: The AMUTE signal from the micro controller is active at power-on and for a short time when a preset is changed. When the band is changed the output is muted by charging C52. The audio output must be muted whenever the tuner is in stereo mode and is also off-tune. This is

15、 to eliminate noise during tuning and is provided by Q8 and the MONO and OFF TUNE control signals. In Mono mode this mute is disabled so that weak stations can be heard, despite the noise. Micro controller Control of the DiVA T51 tuner is performed by a single micro controller Z10, LA7230. This also

16、 provides keypad input and drives a LCD directly. At power-on a matrix of diodes is scanned to set-up the controller for the correct options: D7 selects the correct frequency ranges. D10 enables the use of Auto tuning as well as manual tuning. D8 allows the Auto-tuning mode to use the IF Count metho

17、d of searching. The position of jumpers JP 5 & JP6 fitted to SK9 are used to disable or enable LW and also whether the AM band steps are 9 kHz (UK) or 10 kHz (USA). Z10 provides control signal outputs for the following functions: MONO - To defeat the stereo decoder AMUTE - Turns on the mute circuit

18、when a button is pressed & during tuning. FM, MW & LW - Only one output active low at any one time. Used to switch on specific parts of the RF circuitry as appropriate. The micro controller includes a Phase-Locked-Loop (PLL) circuit which compares the tuner local oscillator signals (FMIN & AMIN) wit

19、h a reference frequency. Based on this information and the required tuned frequency the controller varies the tuning voltage to the FM and AM front ends. The tuning voltages (FMVt & AMVt) have to be filtered from the PLL by the circuitry around Q7 & Q13. Display PCB The display PCB holds the keypad,

20、 LCD display, LED back light module and On-Tune indicator. The remote control receiver consists of the receiver RX1 and the PIC micro controller, Z1, which is used to decode the incoming remote control codes from RC5 format to Sanyo type commands. This is because the Sanyo micro controller, Z10, can

21、 only respond to Sanyo remote control commands. Jumper Settings Jumper Option 1 Option 2 JP1 Best sensitivity Best sound JP2 Best sensitivity Best sound JP3 De-emphasis 50uS De-emphasis 75uS JP4 De-emphasis 50uS De-emphasis 75uS JP5 LW & MW MW only JP6 AM spacing 9KHz AM spacing 10KHz JP7 Less X-MOD

22、 Less De-sense USA / Rest of the World If the T51 is transferred from or to the USA the following jumper settings will require changing. Jumper Rest of the World USA Action JP3 50uS 75uS De-emphasis JP4 50uS 75uS De-emphasis JP6 9KHz 10KHz AM spacing 12345678ABCD87654321DCBAISSUEDRAWING NO.DRAWING T

23、ITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1078 L892 T51 TUNERL892_1L892_1.ddb - L892c1_1_2.prjA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51 TunerCircuit DiagramL892CTCL12-Sep-2000INITIALSDate Printed14SheetofNotes:LK18LK19LK

24、20LK22LK23LK24LK25LK26LK27LK28LK29LK30LK31LK32LK33LK34LK35LK36LK37LK38LK39LK40LK41LK43LK44LK45LK46LK47LK48LK49LK50LK51LK52LK53LK54TieCableEL10CABLE_TIEF3T100MASPKit MaskExclude NF parts from kit mask, i.e. Not Fitted.This applies to R4 and R104PCBPCBL892PB_1DetailDrillingDD1DRILL_DWGPaper MarkerA2 V

25、erticalDD2DD_A2VPaper MarkerA2 HorizontalDD3DD_A2HPD1TOOLINGPD2TOOLINGPD3TOOLINGPD4TOOLINGFIX1FIX2FIX3FIX4FIX5FIX6FIX7FIX8Tooling & Fixing HolesTooling HolesMain PCB Fixing HolesLCTRHCTRSDAMINIFCNTFMLWON TUNEFM AudioAM AudioFMVtAMVtOFF TUNEPower MuteLOSCANFM/AM IF DemodulatorL892C2_1_2.SCHFM AudioAM

26、 AudioFMAMUTEOFF TUNEMONOSTEREOPower MutePICMUTEStereo decoder and AudioL892C3_1_2.SCHAMINFMVtAMVtHCTRLCTRSTEREOFMLWMONOIFCNTAMUTESDON TUNELOMWPICMUTESCANMicroprocessor and PLLL892C4_1_2.SCHPhoto StripPSPHOTO_STRIPCEM1, 2 OZ CuPCB MATERIALDD4CEM1_20ZPhoto BlockPHOTO_BLOCKLK55LK56LK571LK58LK59LK60Upd

27、ate BoxEL1UPDATE_BOXCL17/7/00PRODUCTION RELEASE00-10441.200_1078CL12/09/00R93 WAS 220R NOW 1K012345678ABCD87654321DCBAISSUEDRAWING NO.DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1078 L892 T51 TUNERL892_1L892_1.ddb - L892C2_1_2.SCHA & R Cambridge Ltd.Pembroke A

28、venueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51 TunerCircuit DiagramL892CTCAH/SJB12-Sep-2000INITIALSDate Printed24Sheetof12SK102WVERTJUMPERCF3SFE10.7MLAFM I/P123GND4Quad 15Quad 26Vcc7On Tune8AFC9FM IF10AM IF11FM O/P12STRQ1314AM O/P15S meter16AM adj17IF in18AGC19IF out20AM I/P21Reg22Osc23A

29、M Osc24Z9LA1266CF1SFE10.7MLAR66220R MFC3810N CDR71330R MFQ9BC549BQ10BC557BC4547N CDC4647N CDC69100P CDC70100P CDR7715K MFR5222R MFR5522K MFR7822K MF+C10100U ELC1410N CDP12VR4610R FU+C2210U ELC4747N CDLCTRHCTRSDAMINC65 1N0 CD+C2310U ELIFCNTP12VR4710R FU+C2410U ELC3010N CDC4847N CDC4947N CDR1622K MFC5

30、047N CDR795K1 MF+C531U0 EL+C541U0 ELR4468K MFQ3BC557BP12VR374K7 MFFMLWR384K7 MFQ11BC547BLow = AMON TUNER801K0 MFR1710K MF+C551U0 ELTo On-Tune LED on displayR751K2 MFC86100P PPFM AudioAM AudioR6918K MFFMVtFMGndAMR874K7 MFP12VT5AM_IFTAMVtA_FMRFA_AMRFA_FMGNDA_FMLOA_AMLOA_FMVTA_AMVTA_ONTUNEA_FMAUDA_AMAU

31、DA_SMETERA_FMBIRDAFOFF TUNER684K7 MFP5VQ19BC557BR924K7 MFP5VQ2BC557BQ6BC547BR1010K MFR2510K MFPower MuteR944K7 MFC4222P CDTP7TP6!LOA_AMSIG1A_AMSIG2A_AMSIG3R40100K MFR53100K MFR2910K MFR242K7 MFR282K7 MFR432K7 MF12345678Birdie FilterL2BIRDIEIF Out7Gnd4LO Out8V Tune5Vcc6Gnd3Gnd2Ant1CaseFE1MITSUMI_FE16

32、4Can32L3QUAD_COIL_A431Can62L4QUAD_COIL_BR565K6 MFR58100K MFC8510N CDR196K8 MFCF2SFE10.7MLASK7FMAMANT24A1A3A6A2A1B2B3B4B5A6B1C2C3C1321D2D3D4D5D6D4C6C889955664477CansL5AM_MODULER2010K MFC66680P PP+C3110U EL+C2510U ELBA_IFOUTA_FMINA_LWA_AMGNDR57220R MFC3410P CDQ15BC547BQ14BC547BQ12BC547B+C261U0 ELC3910

33、0N PCC27100N PC123456SK6DIL6 VPLGC6747P CDJP1JUMPERJP2JUMPERLink 1&3, 2&4 for best sound quality,Link 3&5, 4&6 for best selectivity.D241N4148C2810N CDR15390R MFR5110K MFQ17ZVNL120D251N4148D261N4148C4110N CDR73 1M0 MFC4310N CDR76330R MFR81330R MFC6310N CDQ21J112R831K0 MFD271N4148R721K2 MFSCANMount Cl

34、ose to L3AGCR8447K MFR853K3 MFC711N3 PPFMCENTRETP9JP7JUMPER12SK112WVERTJUMPERFit JP7 to SK10 for less cross-mod,Fit JP7 to SK11 for less de-sensing.1+C73100U ELR884K7 MFC751N0 CDC761N0 CDR8910R MF00_1044MGM31/7/00INITIAL RELEASER7068R MFR67820R MFR931K0 MF1.200_1078CL12/09/00R93 WAS 220R NOW 1K01234

35、5678ABCD87654321DCBAISSUEDRAWING NO.DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1078 L892 T51 TUNERL892_1L892_1.ddb - L892C3_1_2.SCHA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51TunerCircuit DiagramL892CTCAH/SJB12-Sep-

36、2000INITIALSDate Printed34SheetofR304K7 MFR314K7 MFR334K7 MFR415K6 MFC35470N PEC36470N PE+C74100U ELC2910N CD+C511U0 ELQ1BC557BQ4BC547B+C1610U ELC561N0 PPR191K MFR10191K MFR45 10R FUVinIGNDGVoutOZ67805VinIGNDGVoutOZ57812+C583M3 EL+C72100U EL+C20100U EL+C18100U ELVinIGNDGVoutOZ77805D221N4003F+C68100U

37、 ELP5VP5V6P12VVBLAudio & RFPowerSupplyBacklightPowerSupplyDigitalPowerSupplyBack-upPowerSupplyC591N0 CDC601N0 CDC611N0 CDC621N0 CDNLSK5IEC2Vcc22AM I/P1Comp O/P3L Out5L F/B6R F/B7R Out8Vee12ST LED131617Sep Adj4PLL182019X in21FM/AM10Mute I/P15Power Mute9FM I/P2Band mute14Mute O/P11Z8LA3401X3CSB456321Z

38、3ANJM2114567Z3BNJM211484Z3CNJM2114+C810U EL+C10810U ELR9120R MFR109120R MFR822K MFR10822K MFC9100P CDC109100P CDL115MH_VARL10115MH_VARR64K7 MFR710K MFR1064K7 MFR10710K MFR512K MFR312K MFR10312K MFR10512K MF+C710U EL+C10710U ELC6680P PPC106680P PPC5680P PPC105680P PPC44N7 PPC1044N7 PPFM AudioAM Audio

39、C1330P PPC101330P PPC2220P PPC102220P PPC3470P PPC103470P PPR282K MFR10282K MF+C522U2 EL+C2110U ELFMR1182K MFR1282K MFD131N4148D141N4148Q8BC547BR1310K MFR144K7 MFAMUTEOFF TUNEP12VC4447N CDMONOF1T100MAC9110N CD1012457230V115V6T1A52T_MAINS_TX*R9110K MFP5VSTEREOHS1TO220HS30P12VA_LIVEA_NEUTA_SECAA_SECBA

40、_SWAA_SWBA_GNDA_P12VA_VBLA_P5VA_P5V6A_MUTEA_AUDGNDA_LEFTA_RIGHTCDEQ18BC547BR264K7 MFR274K7 MFP5VD151N4148D161N4148Q5BC547BR5010K MF+C37100U ELR35100K MFR364K7 MFP5V6Power MuteD91N4148A_MONOR4922K MFR104NOT FITTEDR4NOT FITTEDTP1TP2TP3TP4TP5EMC1NFSK4APHONO44NFSK4BPHONO4F2T160MA115VA_230VA_115V50us75us

41、789SW1C101112SW1D123SW1A456SW1BR3210K MFR4810K MFD18UF4003D19UF4003D20UF4003D21UF4003+C321U0 ELC4010N CDD121N4148PICMUTEA_PMUTEA_STEREOA_FM!Not connectedHS2ATO220HS30REGVinIGNDGVoutOZ47812R34 47K MFRV1470K PSETC57100N PE123456SK8DIL6 VPLGJP3JUMPERJP4JUMPERDe-emphasis selection.Link 1&3 and 2&4 for 5

42、0us.Link 3&5 and 4&6 for 75us.12341T2CM_CHOKEpin14pin8pin1pin2+C1110U ELR864K7 MFINITIAL RELEASE00-1044MGM31/7/001.200_1078CL12/09/00R93 WAS 220R NOW 1K012345678ABCD87654321DCBAISSUEDRAWING NO.DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1078 L892 T51 TUNERL892

43、_1L892_1.ddb - L892C4_1_2.SCHA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51 TunerCircuit DiagramL892CTCAH/SJB12-Sep-2000INITIALSDate Printed44SheetofXIN1TEST 12REMO3STEREO4K55K46VOL7FM8MW9LW10SW1/VU11SW2/VD12MO/ST13MUTE14CE15DO16CLK17IFCNT18NARROW19PWROUT20A

44、MUTE21STB22T723T624T525T426T327T228T129T030Vdd31K332K233K134K035S2836S2737S2638S2539S2440S2341S2242S2143S2044S1945S1846S1747S1648S1549S1450S1351S1252S1153S1054S955S856S757S658S559S460S361S262S163COM26465INT66HOLD67RES68SD69HCTR70LCTR71SNS72Vdd73FMIN74AMIN75Vss76EO177EO278TEST 279XOUT80COM1Z10LC7230X

45、14.500MHZC8033P CDC8233P CDAMINFMVtAMVtHCTRLCTRD11N4148D21N4148D31N4148D41N4148D51N4148D61N4148D71N4148D81N4148D231N4148D101N4148D111N4148AMANSTEREOFMLWMONOIFCNTAMUTESDC1210N CDR6510K MFR6210K MFDefault = LowON TUNED171N4003F+C78100U ELC1310N CDP5VP5V6+C840F1 ELA K0A_K1A_K2A_K3A_T0A_T1A_T2A_T3A_T4A

46、T5A_S20A_S21A_S22A_S23A_S24A_S25A_S26A_S27A_S28A_COM1A_COM2A_S1A_S2A_S3A_S4A_S5A_S6A_S7A_S9A_S10A_S11A_S12A_S13A_S14A_S15A_S16A_S17A_S18A_S19ShiftIFCNTB0LWQ7BC547BQ13BC547BR1810K MFR23100R FU+C15100U ELP12VC1915N PER212K7 MFR224K7 MF!12345678910111213141516171819202122SK2FFC22VVBLP5V1234567891011121

47、3141516171819202122SK1FFC22VLOR205 1K0 MFR206 1K0 MFL20133UH AXR207 1K0 MFR208 1K0 MFR209 1K0 MFR210 1K0 MFR2111K0 MFR212 1K0 MFR213 1K0 MFR2141K0 MFR2151K0 MFR216 1K0 MFQ_1Q_2Q_3Q_5Q_6Q_7Q_8Q_9Q_11Q_12Q_13Q_14Q_15LWAM9kHz10kHzMW12345678910SK3FFC10VTo Remote Control PCBC3310N CDP5VPICMUTEA_AMUTEA_RE

48、MINR3910K MFQ16BC547BR60100K MFR61100K MFR4215K MFP5VR54 220R 1W CFR59220R 1W CFR63220R 1W CFR64220R 1W CFTP8Q20ZVNL120C6447N CDR82330R MFR744M7 MFD281N4148SCAN123456SK9DIL6 VPLGJP5JUMPERJP6JUMPERLink 1&3 for LW and MW.Link 3&5 for MW only (AM).Link 2&4 for 9KHz AM spacing.Link 4&6 for 10KHz AM spac

49、ing.D291N41481Q22ZVNL120AMuteAMute+C171U0 ELINITIAL RELEASE00_1044MGM31/7/001.200_1078CL12/09/00R93 WAS 220R NOW 1K012345678ABCD87654321DCBAISSUEDRAWING NO.DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1081 L893 T51 TUNER DISPLAYL893_1L893_1.ddb - L893c1_2.schA

50、& R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51 DISPLAY BOARDCircuit DiagramL893CTCL15-Sep-2000INITIALSDate Printed11SheetofSW201TACTSW A1508SW202TACTSW A1508SW203TACTSW A1508SW204TACTSW A1508SW205TACTSW2SW206TACTSW2SW207TACTSW A1508SW208TACTSW A1508SW209TACTSW