NAD-C445-tun-sm 维修电路原理图.pdf

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1、NADC 445FM / AMDAB TUNERC 445CFM / AMDAB TUNERSERVICE MANUALRadioFans.CN 收音机爱 好者资料库PRODUCT SAFETY SERVICING GUIDELINES CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT INANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONSWITHOUT MANUFACTURERS APPROVAL. UNAUTHORIZEDMODIFICATIONS WILL NOT ONLY VOID THE WAR

2、RANTY, BUTMAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTINGPROPERTY DAMAGE OR USER INJURY.SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOUARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWINGSAFETY CHECKS AND SERVICING GUIDELINES. TO DOOTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDSAND INJURY TO THE USE

3、R. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FORPROTECTION FROM AC LINE SHOCK.SAFETY CHECKSAFTER THE ORIGINAL SERVICE PROBLEM HAS BEENCORRECTED. A CHECK SHOULD BE MADE OF THEFOLLOWING.SUBJECT : FIRE & SHOCK HAZARD1. BE SURE THAT ALL COMPONENTS ARE POSITIONED INSUCH A WAY AS TO AVOID POSSIBILITY

4、OF ADJACENTCOMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANTON THOSE MODULES WHICH ARE TRANSPORTED TO ANDFROM THE REPAIR SHOP. 2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVEDEVICES SUCH AS INSULATORS, BARRIERS, COVERS,SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, ANDOTHER HARDWARE HAVE BEEN REINSTALLED

5、 PERORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSEOF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLECOLD SOLDER JOINTS, SOLDER SPLASHES OR SHARPSOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSEFOREIGN PARTICLES.4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE

6、ORDETERIORATION TO PARTS AND COMPONENTS. FORFRAYED LEADS, DAMAGED INSULATION (INCLUDING ACCORD). AND REPLACE IF NECESSARY FOLLOW ORIGINALLAYOUT, LEAD LENGTH AND DRESS.5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVINGTUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEADTENSION AROUND PROTRUDING METAL SURFA

7、CES MUSTBE AVOIDED.6. ALL CRITICAL COMPONENTS SUCH AS FUSES,FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BEREPLACED WITH EXACT FACTORY TYPES, DO NOT USEREPLACEMENT COMPONENTS OTHER THAN THOSESPECIFIED OR MAKE UNRECOMMENDED CIRCUITMODIFICATIONS.7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM ANAC LEAKA

8、GE TEST ON ALL EXPOSED METALLIC PARTS OFTHE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNATERMINALS. HANDLE AND SCREWS) TO BE SURE THE SETIS SAFET TO OPERATE WITHOUT DANGER OF ELECTRICALSHOCK. DO NOT USE A LINE ISOLATION TRANSFORMERDURING THIS TEST USE AN AC VOLTMETER, HAVING 5000OHMS PER VOLT OR MORE

9、 SENSITIVITY, IN THEFOLLOWING MANNER; CONNECT A 1500 OHM 10 WATTRESISTOR, PARALLELED BY A .15 MFD, 150V AC TYPECAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND(WATER PIPE, CONDUIT, ETC.) AND THE EXPOSEDMETALLIC PARTS, ONE AT A TIME. MEASURE THE AC VOLTAGE ACROSS THE COMBINATIONOF 1500 OHM RESISTOR AND .1

10、5 MFD CAPACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGEMEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S.THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUEEXCEEDING THIS LIMIT CONSTITUTES A POTENTIALSHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.SUBJECT : GRAP

11、HIC SYMBOLSSUBJECT : TIPS ON PROPER INSTALLATION1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS,CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVEROR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATEDAIR FLOW.2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS:OUTDOOR PATIO INSTALLATIONS WHERE DEW IS AFACTOR, NEAR

12、 STEAM RADIATORS WHERE STEAMLEAKAGE IS A FACTOR, ETC.3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCTREAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THEUSE OF DECORATIVE SCARVES OR OTHER COVERINGSWHICH MIGHT OBSTRUCT VENTILATION.4. WALL AND SHELF MOUNTED INSTALLATIONS USING ACOMMERCAL MOUNTING KIT MUST

13、FOLLOW THE FACTORYAPPROVED MOUNTING INSTRUCTIONS A PRODUCTMOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITSORIGINAL FEET (OR THE EQUIVALENT THICKNESS INSPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSSTHE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERSMUST NOT TOUCH ANY PARTS OR WIRING. PERFORMLEAKAGE TEST ON CU

14、STOMIZED INSTALLATIONS.5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF APRODUCT ON SLOPING SHELF OR A TILTED POSITION,UNLESS THE PRODUCT IS PROPERLY SECURED.6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLEON ITS MOUNTING TO THE CART. CAUTION THECUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CARTWITH SMA

15、LL CASTERS ACROSS THRESHOLDS OR DEEPPILE CARPETS.7. CAUTION CUSTOMERS AGAINST THE USE OF A CART ORSTAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERSLABORATORIES, INC. FOR USE WITH THEIR SPECIFICMODEL OF TELEVISION RECEIVER OR GENERICALLYAPPROVED FOR USE WITH T.V.S OF THE SAME ORLARGER SCREEN SIZE.8. CA

16、UTION CUSTOMERS AGAINST THE USE OF EXTENSIONCORDS, EXPLAIN THAT A FOREST OF EXTENSIONSSPROUTING FROM A SINGLE OUTLET CAN LEAD TODISASTROUS CONSEQUENCES TO HOME AND FAMILY.THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN ANEQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THEPRESENCE OF UNINSUL

17、ATED “DANGEROUS VOLTAGE” WITHIN THEPRODUCTS ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TOCONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE ISINTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANTOPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THELITER

18、ATURE ACCOMPANYING THE APPLIANCE.Page 2 of 28RadioFans.CN 收音机爱 好者资料库Page 3 of 28FM SECTION Frequency Range: 87.50 MHz to 108.00 MHz (50 kHz steps)Signal-to-Noise Ratio: 65dB (Mono) 60dB (Stereo)Presets:30AM SECTION Frequency Range: 522 kHz to 1620 kHz (9 kHz steps) Signal-to-Noise Ratio: 35dB Preset

19、s:DAB SECTION Band lll: 174MHz - 240MHzBand L : 1452MHz - 1492MHzMax signal: -3dBmSensitivity: -96dBmAdjacent Channel Rejection: 35dBPresets: ? ?Display:2-line by 16-character DOT Matrix Audio Output Stereo:2.5V P-P48kHz sample rate, 16 bit sample resolutionOptical S/PDIF: IEC60958 Compliant.48kHz s

20、ample rate, 24 bit sample resolutionGENERAL Power Requirement: 230-240V AC, 50Hz Power Consumption: 12W 0.8W(standby)DIMENSIONS (MAX) Width Height Depth: 435 x 86 x 318mm Weight: 30 996kg SPECIFICATIONSPage 4 of 28This unit is designed for trouble-free operation. Most problems users encounter are du

21、e to operating errors. If you have a problem, first check this listfor a possible solution. If the problem persists, consult your authorized Service Centre. SymptomCause/CorrectionNo lights appear when System Power button is pressed Unit is plugged into a live outlet. Make sure the outlet is active.

22、 No sound is heard Tune to an active station. Check for correct amplifier settings. Check the connections and wires. Sound distorts, particularly in stereo mode. Use a more directional antenna. Intermittent or continuous buzzing or hissingPlace the unit further away from these appliances. Install no

23、ise filters on the appliances. Display says No stations Available Check that antenna is connected. Ensure that DAB coverage exists in your area. Display has gone blank or says service off air This may occur if a broadcaster changes the label of a service or removes a labelwhilst you are listening to

24、 it. Try to retune to this station, using the Autotuneprocedure.Units operation or the displays seem abnormalTo correct this problem, first unplug the unit from the AC wall outlet and wait atleast three minutes. After the pause, reconnect the AC power cord and check theunits operation. Reset the C44

25、5 Tuner; press and hold the Menu/FM Mute Button for 5 seconds,until the Information Display shows FACTORY RESET. Note that when the systemis reset, all tuner presets will be lost and must be re-entered. Press the RESET switch lightly once or twice with a pencil or ballpoint pen as perexample below.I

26、f these steps do not solve the problem, consult your dealer or an authorizedservice centre. Rear PanelTROUBLESHOOTINGPage 5 of 28 MAINTENANCE FLOW CHART MAINTENANCE FLOW CHART Start Power on Voltages NO1. Check Cable at pins of connector2. Replace Power Supply unit if Power Board is not shorted, (CN

27、93) are normal? otherwise find out first where the short is. YESNO NOCheck CNVMB114MA18L Are FM/AM Is Power Supply(Tuner Module) MAIN Board normal? normal?and peripheral circuit. (CUP11866Y) YES NO Is PLL Check S3F84BB Clock normal?and peripheral circuit.YESYES Chcek TUNER module connection Antenna.

28、 Power Board (CUP11866Y)NO NOCheck DAB Module Is DAB Is Power Supplyand peripheral normal? normal?circuit.YES NOCheck 74ACT04(IC73) or Is Voltage level74LVC04(IC74) and normal?peripheral circuit. MAIN BoardYES (CUP11866Y)YES NOCheck S3F84BB or DAB Are Clock andModule and peripheral Data normal?Circu

29、it.YES Check DAB Module connection Antenna. Normal OperationPage 6 of 28WIRING DIAGRAMPage 7 of 28Page 8 of 28Page 9 of 28Page 10 of 28Page 11 of 28Page 12 of 28Terminal assignmentRelay - top viewNon-latching type,not energized conditionlatching, 2 coilsreset conditionLatching type,reset conditionFP

30、2 Relay (RT21) 1?2?3?48?7?6?5V+?Out B?In B?+In BOut A?In A?+In A?VOPA21348-Pin DIP, SO-8ABBLOCK DIAGRAM (IC22, IC23, IC24: OP AMP)Page 13 of 28PIN CONNECTION AND IEC LOGIC SYMBOLSINPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE PIN NoSYMBOLNAME AND FUNCTION1, 3, 5, 9, 11, 131A to 6ADa

31、ta Inputs2, 4, 6, 8, 10, 121Y to 6YData Outputs7GNDGround (0V)14VCCPositive Supply VoltageAYLHHLHEX INVERTER (IC73: 74ACT04)Page 14 of 28Terminal Functions (IC21: PCM1796) TERMINALI/ODESCRIPTIONSNAMEPINI/ODESCRIPTIONSAGND119Analog ground (internal bias)AGND224Analog ground (internal bias)AGND3L27Ana

32、log ground (L-channel DACFF)AGND3R16Analog ground (R-channel DACFF)BCK6IBit clock input(1)DATA5ISerial audio data input(1)DGND8Digital groundIOUTL+25OL-channel analog current output+IOUTL26OL-channel analog current outputIOUTR+17OR-channel analog current output+IOUTR18OR-channel analog current outpu

33、tIREF20Output current reference bias pinLRCK4ILeft and right clock (fS) input(1)MC12IMode control clock input(1)MDI11IMode control data input(1)MDO13I/OMode control readback data output(3)MS10I/OMode control chip-select input(2)MSEL3II2C/SPI select(1)RST14IReset(1)SCK7ISystem clock input(1)VCC123Ana

34、log power supply, 5 VVCC2L28Analog power supply (L-channel DACFF), 5 VVCC2R15Analog power supply (R-channel DACFF), 5 VVCOML22L-channel internal bias decoupling pinVCOMR21R-channel internal bias decoupling pinVDD9Digital power supply, 3.3 VZEROL1I/OZero flag for L-channel(2)ZEROR2I/OZero flag for R-

35、channel(2)(1)Schmitt-trigger input, 5-V tolerant(2)Schmitt-trigger input and output. 5-V tolerant input and CMOS output(3)Schmitt-trigger input and output. 5-V tolerant input. In I2C mode, this pin becomes an open-drain 3-state output; otherwise, this pin is a CMOSoutput.Page 15 of 28FUNCTIONAL BLOC

36、K DIAGRAM (IC21: PCM1796)Power SupplyRSTSCKAdvancedSegmentDACModulatorIOUTL+IOUTLIOUTRCurrentSegmentDACIOUTR+BiasandVrefVCOMLVCOMRAGND2VDDVCC1VCC2LVCC2RAGND1I/V and Filter?8OversamplingDigitalFilterandFunctionControlAudioData InputI/FLRCKBCKDATAMDOMDIMCMSAGND3LAGND3RDGNDCurrentSegmentDACIREFVOUTLI/V

37、 and FilterVOUTRFunctionControlI/FMSELZeroDetectZEROLZERORSystemClockManagerPage 16 of 28PIN ASSIGNMENTS(IC21: PCM1796) 1234 5678910111213142827262524232221201918171615ZEROLZERORMSELLRCKDATABCKSCKDGNDVDDMSMDIMCMDORSTVCC2LAGND3LIOUTLIOUTL+AGND2VCC1VCOMLVCOMRIREFAGND1IOUTRIOUTR+AGND3RVCC2RPCM1796(TOP

38、VIEW)Page 17 of 28RESET IC (RE5VL28CATZ) : IC72Page 18 of 28IC71 FUNCTION (MI-COM S3F84BB)IC71 FUNCTION (MI-COM S3F84BB)Pin No.PIN NAMEI/ODESCRIPTIONPin No.PIN NAMEI/ODESCRIPTION18FIP-DAOFIP Data output port9N.C-Non connection10SINOIUART Data input port11SOTOOUART Data output port12VDD1IPower supply

39、 port(+5V)13VSS1IGND14XTOUTO10MHz crystal connection port15XINI16TESTIBack-up Input17,18N.C-Non connection19RESETIReset input port(L)20N.C-Non connection21DAB_DINIDAB Data input port22DAB_DOUTODAB Data output port23DAB_CLKODAB Clock control port(L)24FM/AM_MUTEOFM/AM MUTE control port(L)25PLL_DATAOPL

40、L Data output port26PLL_CEOPLL Enable control port27PLL_CLKOPLL Clock control port28STEREOITuner module stereo control port29TUNEDITuner module tuned control port30PLL_DINIPLL Data input port31RDS_CLKORDS Clock control port32RDS_DATAIRDS Data input port33BACK_UPIBACK-UP mode control port(L)34REMOTE_

41、INIRemote unit data input port3538N.C-Non connection39,40GNDIGND41SCROLL_UPIScroll up control port42SCROLL_DNIScroll down control port43VREFIA/D converter reference voltage44AVSSIGND45GNDI46KEY3I47KEY2I48KEY1IKEY 1 control port4951N.C-Non connection52VSS2IGND53VDD2IPower supply port(+5V)54SYSTEM_MUT

42、EOSystem MUTE control port(L)55STAND_BYOStandby on control port(L)56FM/AM_ONOFM/AM on control port(L)57N.C-Non connection58POWER_ONOUnit turn on control port(L)5964N.C-Non connection6568OPTIONIGND or OPEN6970N.C-Non connection71OPTIONIGND or OPEN7274N.C-Non connection75OPTIONIGND or OPEN7677N.C-Non

43、connection78RS_PORegister selection port79WRITEOWrite enable port80READORead enable portPage 19 of 28BLOCK DIAGRAM (IC71: S3F84BB) I/O Port and Interrupt ControlSAM88RC CPU64K-ByteROM2064-ByteRAMOSC/RESETB8-BitBasic Timer8-BitTimer/CounterA,B8-BitTimer/CounterC0,C116-BitTimer/Counter10,11Port 0Port

44、1A/DPort 2P2.0-P2.7XINXOUTRESETBP2.7/TAOUTP2.6/TACAPP2.5/TACKP3.6/TCOUT1P2.4/TBOUTP3.4/T1OUT0P1.0-P1.7P0.0-P0.7AVREFAVSSPort 3P3.0-P3.7Port 4P4.0-P4.7/INT0INT7Port 5P5.0-P5.7Port 6P6.0-P6.7SIO/UART0,1PGP3.7/TCOUT0P0.0P0.7/PG0PG7P3.2/T1CAP0P3.0/T1CK0P3.5/T1OUT1P3.3/T1CAP1P3.1/T1CK1P2.2/SCKP2.1/SIP2.0

45、/SOP5.3/RXD0P5.2/TXD0P5.1/RXD1P5.0/TXD1Port 8Port 7D/AP7.0-P7.7/ADC0ADC7P8.0-P8.5/INT8,INT9P2.3/DAOUT Figure 1-1. S3C84BB/F84BB Block Diagram Page 20 of 28PIN ASSIGNMENT (IC71: S3F84BB) P1.7P1.6P1.5P1.4P1.3P1.2P1.1P1.0 P0.7/PG7P0.6/PG6P0.5/PG5P0.4/PG4P0.3/PG3P0.2/PG2P0.1/PG1P0.0/PG0P2.7/TAOUTP2.6/TA

46、CAPP2.5/TACKP2.4/TBPWMP2.3/DAOUTP2.2/SCKP2.1/SIP2.0/SOP5.7P5.6/SDATP5.5/SCLKVDD1VSS1XOUTXINTESTP5.4P5.3/RxD0RESETBP5.2/TxD0P5.1/RxD1P5.0/TxD1P3.7/TCOUT1P3.6/TCOUT0S3C84BB/F84BB(80-QFP-1420C)64636261605958575655545352515049484746454443424112345678910111213141516171819202122232465666768697071727374757

47、67778798025262728293031323334353637383940P3.5/T1OUT1P3.4/T1OUT0P3.3/T1CAP1P3.2/T1CAP0P3.1/T1CK1P3.0/T1CK0P4.7/INT7P4.6/INT6P4.5/INT5P4.4/INT4P4.3/INT3P4.2/INT2P4.1/INT1P4.0/INT0P7.7/ADC7P7.6/ADC6P8.0P8.1P8.2P8.3P8.4/INT8P8.5/INT9P6.0P6.1P6.2P6.3P6.4VDD2VSS2P6.5P6.6P6.7P7.0/ADC0P7.1/ADC1P7.2/ADC2P7.3

48、/ADC3AVSSAVREFP7.4/ADC4P7.5/ADC5 Figure 1-2. S3C84BB/F84BB Pin Assignment (80-QFP) Page 21 of 28HEX INVERTER (IC74: 74LVC04A)PIN CONFIGURATION12345671A1Y2A2Y3A3YGNDVCC6A6Y5A5Y4A4Y141312111098SV00396PIN DESCRIPTIONPIN NUMBERSYMBOLNAME AND FUNCTION1, 3, 5, 9, 11, 131A to 6AData inputs2, 4, 6, 8, 10, 1

49、21Y to 6YData outputs7GNDGround (0 V)14VCCPositive supply voltageLOGIC SYMBOL1A1Y2A2Y3A3Y4A4Y5A5Y6A6Y1359111324681012SV00397LOGIC SYMBOL (IEEE/IEC)1234569811101312111111SV00398LOGIC DIAGRAM (ONE GATE)AYSV00399FUNCTION TABLEINPUTSOUTPUTSnAnYLHHLNOTES:H = HIGH voltage levelL = LOW voltage levelPage 22

50、 of 28KTC28741. Emitter2. Collector3. BaseTO-921231. INPUT2. GND3. OUTPUTNJM7805FAL7812CPTO-220FP1231. GND2. INPUT3. OUTPUTL7912CPTO-220FP123KTC23161. Emitter2. Collector3. BaseTO-92L123TRANSISTOR, REGULATOR IC BLOCK DIAGRAMKRA107MKRC107M1. Emitter2. Collector3. BaseTO-92M123Page 23 of 28ELECTRICAL