Arcam-DivaT51-tun-sm(1)维修电路原理图.pdf

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1、T51DiVA T51 AM/FM TunerService Manual ARCAMARCAMIssue 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 Main

2、s voltage 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

3、 capacitor (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 L

4、ED back 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 filte

5、r CF3 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

6、 point 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 disto

7、rtion 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 b

8、etween 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,

9、tuned 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 redu

10、ce co-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

11、RV1. 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. C

12、2 & C102 (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 pow

13、er switch 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 Z

14、8 is 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. Th

15、is is 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

16、 also 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

17、method 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 cir

18、cuit 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

19、) with 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 ke

20、ypad, 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

21、, can 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

22、X-MOD 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.DRAW

23、ING TITLEDrawn 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:LK18L

24、K19LK20LK22LK23LK24LK25LK26LK27LK28LK29LK30LK31LK32LK33LK34LK35LK36LK37LK38LK39LK40LK41LK43LK44LK45LK46LK47LK48LK49LK50LK51LK52LK53LK54TieCableEL10CABLE_TIEF3T100MASPKit MaskExclude NF parts from kit mask, i.e. Not Fitted.This applies to R4 and R104PCBPCBL892PB_1DetailDrillingDD1DRILL_DWGPaper Marke

25、rA2 VerticalDD2DD_A2VPaper MarkerA2 HorizontalDD3DD_A2HPD1TOOLINGPD2TOOLINGPD3TOOLINGPD4TOOLINGFIX1FIX2FIX3FIX4FIX5FIX6FIX7FIX8Tooling & Fixing HolesTooling HolesMain PCB Fixing HolesLCTRHCTRSDAMINIFCNTFMLWON TUNEFM AudioAM AudioFMVtAMVtOFF TUNEPower MuteLOSCANFM/AM IF DemodulatorL892C2_1_2.SCHFM Au

26、dioAM AudioFMAMUTEOFF TUNEMONOSTEREOPower MutePICMUTEStereo decoder and AudioL892C3_1_2.SCHAMINFMVtAMVtHCTRLCTRSTEREOFMLWMONOIFCNTAMUTESDON TUNELOMWPICMUTESCANMicroprocessor and PLLL892C4_1_2.SCHPhoto StripPSPHOTO_STRIPCEM1, 2 OZ CuPCB MATERIALDD4CEM1_20ZPhoto BlockPHOTO_BLOCKLK55LK56LK571LK58LK59LK

27、60Update 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.Pembr

28、oke AvenueDenny 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/P21Reg22O

29、sc23AM 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

30、 MFC5047N 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

31、_AMAUDA_SMETERA_FMBIRDAFOFF TUNER684K7 MFP5VQ19BC557BR924K7 MFP5VQ2BC557BQ6BC547BR1010K MFR2510K MFPower MuteR944K7 MFC4222P CDTP7TP6!LOA_AMSIG1A_AMSIG2A_AMSIG3R40100K MFR53100K MFR2910K MFR242K7 MFR282K7 MFR432K7 MF12345678Birdie FilterL2BIRDIEIF Out7Gnd4LO Out8V Tune5Vcc6Gnd3Gnd2Ant1CaseFE1MITSUMI

32、_FE164Can32L3QUAD_COIL_A431Can62L4QUAD_COIL_BR565K6 MFR58100K MFC8510N CDR196K8 MFCF2SFE10.7MLASK7FMAMANT24A1A3A6A2A1B2B3B4B5A6B1C2C3C1321D2D3D4D5D6D4C6C889955664477CansL5AM_MODULER2010K MFC66680P PP+C3110U EL+C2510U ELBA_IFOUTA_FMINA_LWA_AMGNDR57220R MFC3410P CDQ15BC547BQ14BC547BQ12BC547B+C261U0 EL

33、C39100N 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 MFSCANMou

34、nt Close 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 1K

35、012345678ABCD87654321DCBAISSUEDRAWING 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

36、-Sep-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+C6

37、8100U ELP5VP5V6P12VVBLAudio & RFPowerSupplyBacklightPowerSupplyDigitalPowerSupplyBack-upPowerSupplyC591N0 CDC601N0 CDC611N0 CDC621N0 CDNLSK5IEC212345678ABCD87654321DCBAISSUEDRAWING NO.DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1078 L892 T51 TUNERL892_1L892_1.

38、ddb - L892C4_1_2.SCHA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51 TunerCircuit DiagramL892CTCAH/SJB12-Sep-2000INITIALSDate Printed44SheetofXIN1TEST 12REMO3STEREO4K55K46VOL7FM8MW9LW10SW1/VU11SW2/VD12MO/ST13MUTE14CE15DO16CLK17IFCNT18NARROW19PWROUT20AMUTE21STB

39、22T723T624T525T426T327T228T129T030Vdd31K332K233K134K035S2836S2737S2638S2539S2440S2341S2242S2143S2044S1945S1846S1747S1648S1549S1450S1351S1252S1153S1054S955S856S757S658S559S460S361S262S163COM26465INT66HOLD67RES68SD69HCTR70LCTR71SNS72Vdd73FMIN74AMIN75Vss76EO177EO278TEST 279XOUT80COM1Z10LC7230X14.500MHZ

40、C8033P CDC8233P CDAMINFMVtAMVtHCTRLCTRD11N4148D21N4148D31N4148D41N4148D51N4148D61N4148D71N4148D81N4148D231N4148D101N4148D111N4148AMANSTEREOFMLWMONOIFCNTAMUTESDC1210N CDR6510K MFR6210K MFDefault = LowON TUNED171N4003F+C78100U ELC1310N CDP5VP5V6+C840F1 ELA_K0A_K1A_K2A_K3A_T0A_T1A_T2A_T3A_T4A_T5A_S20A_

41、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!12345678910111213141516171819202122SK2FFC22VVBLP5V1234567891011121314151617

42、1819202122SK1FFC22VLOR205 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_REMINR3910K

43、 MFQ16BC547BR60100K MFR61100K MFR4215K MFP5VR54 220R 1W CFR59220R 1W CFR63220R 1W CFR64220R 1W CFTP8Q20ZVNL12012345678ABCD87654321DCBAISSUEDRAWING NO.DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA00_1081 L893 T51 TUNER DISPLAYL893_1L893_1.ddb - L893c1_2.schA & R Ca

44、mbridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBT51 DISPLAY BOARDCircuit DiagramL893CTCL15-Sep-2000INITIALSDate Printed11SheetofSW201TACTSW A1508SW202TACTSW A1508SW203TACTSW A1508SW204TACTSW A1508SW205TACTSW2SW206TACTSW2SW207TACTSW A1508SW208TACTSW A1508SW209TACTSW A1508

45、SW210TACTSW A1508SW211TACTSW2SW212TACTSW2SW213TACTSW2SW214TACTSW2COM11COM22SEG13SEG24SEG35SEG76SEG97SEG108SEG119SEG1210SEG411SEG1312SEG1413SEG1514SEG1615SEG1716SEG1817SEG1918SEG2019SEG520SEG621SEG2122SEG2223SEG2324SEG2425SEG2526SEG2627SEG2728SEG2829188.8188MONOSTEREOAUTONBIFSTOREFMAMLWkHzMHzN/C30DIS

46、P1A52T LCDMONOAUTODOWNUPSTOREBAND1-92-103-114-125-136-147-158-16VBL1VBL112345678910111213141516171819202122SK202FFC22HP5V112345678910111213141516171819202122SK201FFC22HR204220R MFP5V1D_K3D_K1D_K0D_T3D_P5VD_T4D_K2D_T0D_VBLD_T1D_T5D_GNDAKBL1MCD_BACKLIGHTD_TUNE1.0PRODUCTION RELEASECL31/7/00R33R3 FU+C31

47、0U EL321+5VO/PGNDCaseRX1SBX1610-52R210K MFR1330R MF+C110U ELD11N4148C210N CDP5VRA21RA32RTCC3MCLR4VSS5RB06RB17RB28RB39RB410RB511RB612RB713VDD14OSC215OSC116RA017RA118Z1PIC16C5412345678910SK1FFC10HX1CST4.00P5VFM/AMRemote O/PMUTE O/PPhoto StripPS1PHOTO_STRIPDetailDrillingDD1DRILL_DWGPaper MarkerA2 Horiz

48、ontalDD3DD_A2HUpdate BoxEL1UPDATE_BOXFIX1FIX2FIX3FIX4FIX5FIX6FIX7FIX8FIX9Paper MarkerA2 VerticalDD2DD_A2VFR4, 1 OZ CuPCB MATERIALDD4FR4_1OZLED1LED GREEN3.1MMLED2LED GREEN3.1MMPCBPCB1L893PB_2Layout byCliffEL4CLOGOChairLCDEL2E875PMChairLCDEL3E875PM+C410U EL2.0MECHANICAL MODSCL13/09/0000_1081T51 Main B

49、oard L892_1.2 Reference Description Part Number C1 PPRO 330P 5% 63V RA 2D133 C2 PPRO 220P 5% 63V RA 2D122 C3,C4 PPRO 470P 63V 5% RA 2D147N C5,C6 PPRO 680P 5% 63V RA 2D168 C7,C8 ELST 10U 50V 2N610 C9 CERD 100P 63V 2A110 C10 ELST 100U 25V 2N710 R32 RES MF W4 1% 10K 1H310 R33 RES MF W4 1% 4K7 1H247 R34

50、 RES MF W4 1% 47K 1H347 R35 RES MF W4 1% 100K 1H410 R36-R38 RES MF W4 1% 4K7 1H247 R39 RES MF W4 1% 10K 1H310 R40 RES MF W4 1% 100K 1H410 R41 RES MF W4 1% 5K6 1H256 R42 RES MF W4 1% 15K 1H315 R43 RES MF W4 1% 2K7 1H227 R44 RES MF W4 1% 68K 1H368 R45-R47 RES MF FU W3 5% 10R NFR25 1G010 R48 RES MF W4