NAD-M22-pwr-sm 维修电路原理图.pdf

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1、NADSERVICE MANUAL M22STEREOAMPLIFIERM22 STEREOAMPLIFIERRadioFans.CN 收音机爱 好者资料库TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION.3-4SPECIFICATIONS. 5WIRING DIAGRAM.6 BLOCK DIAGRAM. .7-9 .12-24 PCB LAYOUT.25-30ELECTRICAL PARTS LIST.31-50 EXPLODED VIEW. 51-54EXPLODED VIEW PARTS LIST.55 CIRCUIT DIAG

2、RAMSTROUBLE SHOOTING A GUIDE.10TROUBLE SHOOTING B GUIDE.11RadioFans.CN 收音机爱 好者资料库?SUBJECT: GRAPHIC SYMBOLSPRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTSA.C. VOLTMETERGOOD EARTH GROUNDSUCH AS THE WATERPIPE. CONDUIT. ETCPLACE THIS PROBEON EACH EXPOSEDMETAL PARTCAUTION : DO NOT ATTEMPT TO MODIF

3、Y THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOM-IZED INSTALLATIONS WITHOUT MANUFACTURERSAPPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROP-ERTY DAMAGE OR USER INJURY.SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROU

4、GHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVIC-ING GUIDELINES. TO DO OTHERWISE,INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.WHILE SERVICING, USE AN ISOLATION TRANS-FORMER FOR PROTECTION FROM A.C. LINESHOCK.SAFETY CHECKSAFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN C

5、ORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.SUBJECT : FIRE & SHOCK HAZARD1.BE SURE THAT ALL COMPONENTS ARE POSI- TIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.THIS IS ESPE-CIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.2. NEVER RE

6、LEASE A REPAIR UNLESS ALL PROTEC-TIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE-BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLAR-IZED LINE PLUG HAS NOT BEEN DEFEATED.3. SOLDERING MUST BE INSPEC

7、TED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CER-TAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECES-5

8、. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT

9、COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOM-MENDED CIRCUIT MODIFICATIONS.7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PER-FORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLEAND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE

10、 WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANS-FORMER DURING THIS TEST USE AN A.C. VOLTME-TER, HAVING 5000 OHMS PER VOLT OR MORE SEN-SITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD

11、EARTH GROUND (WATER PIPE, CONDUIT,ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLT-AGE ACROSS THE COMBINATION OF 1500OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASURE-MENTS FOR EACH EXPOSED METALLIC PART. VOLT-AGE MEASURED MUST NOT EX

12、CEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE COR-RECTED IMMEDIATELY.THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDEDTO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNI

13、NSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SERVICING PRECAUTIONS CAUTION

14、:Before servicing the Stereo amplifier covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE: if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publication, always fol

15、low the safety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the Stereo amplifier AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any intern

16、al electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an electrolytic capacitor. Caution: A wrong part substitute or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this

17、Stereo amplifier or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cottontipped swab, or comparable soft applicator. Unless specified otherwise in this serv

18、ice data, lubrication of contacts is not required. 4. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.5. Do not apply AC power to this Stereo amplifier and/or any of its electrical assemblies unless all solid-state device he

19、at sinks are correctly installed. 6. Always connect test instrument ground lead to the appropriate ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn t

20、he power on. Connect an insulation resistance meter (500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1 M-ohm. Note 1: Accessible Conductive Parts including Metal panels, Input

21、 terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical Es devices are integrated circuits and som

22、e field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handing any semiconductor component or semiconductor-equipped assembly, drain off any electrostat

23、ic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reason prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with E

24、S devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an antistatic solder removal device. Some solder removal devices n

25、ot classified a “anti-static” can generate electrical charges sufficient to damage ES devices. 5. Do not use freonpropelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before y

26、ou are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective

27、 material to the chassis or circuit assembly into which the device will be installed. Caution: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8.Minimize bodily motions when handing unpackaged replacement ES devices. (Normally harmless motion such as

28、the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)?OVERALL SPECIFICATIONSContinuous output power into 8 ohms and 4 ohms 250 W (ref. rated THD, 20 Hz 20 kHz, both channels driven)Rated THD

29、(250 mW to rated power, CCIF IMD, DIM 100)0.005 % (ref. 20 Hz - 20 kHz)IHF dynamic power8 ohms : 355 W4 ohms :640 W2 ohms : 620 WDamping factor 800 (ref. 8 ohms, 50 Hz and 1 kHz) Input sensitivity 1.6 V (ref. rated power) Signal-to-noise ratio, A- weighted 98 dB (ref. 1W)Signal-to-noise ratio, A- we

30、ighted 120 dB (ref. rated power)Frequency response 0.1 dB (ref. 20 Hz - 20 kHz)- 2.5 dB at 3 Hz and 100 kHz Time to go to Standby mode at no input signal 30 minutesPOWER CONSUMPTION Rated power640 W (120V 60Hz, 230V 50Hz) Standby power 0.5 WIdle power 40 WDIMENSION AND WEIGHTUnit dimensions (W x H x

31、 D) *435 x 103 x 379 mm Shipping weight 15.0 kg (33.1 lbs)* - Gross dimension include feet, front panel and rear panel extensions (knobs, buttons, speaker terminals, sub fascia, etc.) NAD SHALL NOT BE HELD LIABLE FOR ANY TECHNICAL OR USER INTERFACE DISCREPANCIES IN THIS MANUAL. THE M22 SERVICE MANUA

32、L MAY BE SUBJECT TO CHANGEWITHOUT PRIOR NOTICE. CHECK OUT WWW.NADELECTRONICS.COM FOR THE LATEST VERSION OF THE M22 SERVICE MANUAL.SPECIFICATIONSFRANAISESPAOLITALIANODEUTSCHNEDERLANDSSVENSKA517 1/8 x 4 1/16 x 14 15/16 inches 67OPLME49720CMRTL072DC ser voTL072OPLME49720HypexNC400 OEM Modul eMi cr o co

33、nt r ol l erI I C/ SPI / GPI OPI C18F26K20LEDTOUCHTRI GGERI I CAnal og I nputunbal ancedbal anced100- 120VAC220- 240VACSTB PSU5VMAI N PSU+/ - VB+/ - VDR+/ - VAUXLDOACENABLE3V3Regul at ed suppl yLM317/ LM337+/ - 17. 5VRegul at ed suppl yLM317/ LM337+/ -1 4. 5VCl i ppi ng cont r ol erOPA2134Rel ayCur

34、r ent sensorTL084CNSTBAudi o sense on/ of f3.5mmCY8CMBR2044Block diagram7InstructionDecode andControlPORTAPORTBPORTCRA4/T0CKI/C1OUTRA5/AN4/SS/HLVDIN/C2OUTRB0/INT0/FLT0/AN12RC0/T1OSO/T13CKIRC1/T1OSI/CCP2(1)RC2/CCP1RC3/SCK/SCLRC4/SDI/SDARC5/SDORC6/TX/CKRC7/RX/DTRA3/AN3/VREF+RA2/AN2/VREF-/CVREFRA1/AN1R

35、A0/AN0RB1/INT1/AN10Data LatchData MemoryAddress LatchData Address12AccessBSRFSR0FSR1FSR2inc/declogicAddress4124PCH PCL PCLATH831-Level StackProgram CounterPRODLPRODH8 x 8 Multiply8BITOP88ALU2088Table Pointerinc/dec logic218Data BusTable Latch8 IR123ROM LatchRB2/INT2/AN8RB3/AN9/CCP2(1)PCLATUPCUOSC2/C

36、LKOUT(3)/RA6Note1:CCP2 is multiplexed with RC1 when Configuration bit CCP2MX is set, or RB3 when CCP2MX is not set.2:RE3 is only available when MCLR functionality is disabled.3:OSC1/CLKIN and OSC2/CLKOUT are only available in select oscillator modes and when these pins are not being used as digital

37、I/O.Refer to Section 2.0 “Oscillator Module (With Fail-Safe Clock Monitor)” for additional information.RB4/KBI0/AN11RB5/KBI1/PGMRB6/KBI2/PGCRB7/KBI3/PGDEUSARTComparatorMSSP10-bitADCTimer2Timer1Timer3Timer0CCP2HLVDECCP1BORDataEEPROMWInstruction Bus STKPTRBank8State machinecontrol signalsDecode88Power

38、-upTimerOscillatorStart-up TimerPower-onResetWatchdogTimerOSC1(3)OSC2(3)VDD,Brown-outResetInternalOscillatorFail-SafeClock MonitorPrecisionReferenceBand GapVSSMCLR(2)BlockLFINTOSCOscillator16 MHzOscillatorSingle-SupplyProgrammingIn-CircuitDebuggerT1OSOOSC1/CLKIN(3)/RA7T1OSIPORTEMCLR/VPP/RE3(2)FVRFVR

39、FVRCVREFAddress LatchProgram Memory(8/16/32/64Kbytes)Data LatchPIC18F26K20MCU BOARD8CLOCKOSCILLATOR5.85 V4.9 VSOURCE(S)SRQDCMAXBYPASS/MULTI-FUNCTION(BP/M)+-VILIMITFAULTPRESENTCURRENT LIMITCOMPARATORENABLELEADINGEDGEBLANKINGTHERMALSHUTDOWN+-DRAIN(D)REGULATOR5.85 VBYPASS PINUNDER-VOLTAGE1.0 V + VTENAB

40、LE/UNDER-VOLTAGE(EN/UV)Q115 A25 ALINE UNDER-VOLTAGERESETAUTO-RESTARTCOUNTERJITTER1.0 V6.4 VBYPASSCAPACITOR SELECT AND CURRENTLIMIT STATEMACHINEOVPLATCHSMPS STB BOARDTNY2749YESCheck STB boardCheck LED board5V RIGHT?check IC301 circuitNONOLogo Amber LED on?No Power or Power shuts offimmediately5VL RIG

41、HT?NOCheck L104 C175 C176YESCheck Q110 Q111 Q114 Q115 Q116 circuitChange LED boardYESNOBTouch Power keyLogo led turn white?YESchange STB boardCheck PWM signalYESLogo led turn off?Logo led turn red?YESNOYESCheck PSU board+/-VB +/-VAUX +/-VDR RIGHT?NOCheck STB boardSTB 3V RIGHT?YESChange PSU BoardChec

42、k U1 U5 PWM circuitNOCheck STB Board:Q301 K301 circuitCheck MCU board:Q131 circuitYESCheck MCU BoardVPP VPI +/-17.5V +/-VDR RIGHT?Check MCU BoardNOChange MCU BoardCheck Q123 Q124 circuitYESCheck U104,Change MCU boardCheck LED control signalTROUBLESHOOTING A GUIDE10BF i n i shRear panel led show gree

43、n?YESNOled turn off?Rear panel led show red?NOYESCheck D500 U505 circuit,YESCheck Q500 Q502 Q508 circuitChange NC400 OEM BOARDApply 1khz sinewave to DUTAmplifier output correct?YESNOINC INH signal correct?YESChange NC400 OEM BOARDcheck+/-14.5V,5V Right?NOcheckQ505 Q506 CircuitNOchange AMP boardYESch

44、eckU500 U501 U502 U503 Circuitchange AMP boardcheckQ503 Q504 CircuitTROUBLESHOOTING B GUIDE11 1.MCU VM1.012XM100HOLEC16222NR282100RGNDXM101HOLEC16322NR283100RGND3V3SC13822u/ 6v3C139100NGNDMCLR/VPP/RE31RA0/AN0/C12IN0-2RA1/AN1/C12IN1-3RA24RA35RA46RA5/HLVDIN7VS S8OS C1/CLKIN/RA79OS C2/CLKOUT/RA610RC011

45、RC112RC213RC3/SCK/S CL14RC4/SDI/S DA15RC5/SDO16RC6/TX/CK17RC7/RX/DT18VS S19VDD20RB0/INT0/FLT0/AN1221RB1/INT122RB2/INT223RB3/AN924RB4/KBI025RB5/KBI1/PGM26RB6/KBI2/PGC27RB7/KBI3/PGD28U105PIC18F26K20GNDC137NCR21622kR20810kR210180kGNDVHP1C133100ND1193V63V3SGNDGNDR220100RPG DATAPG CLKMCLRRXDTXDGND3V3S123

46、4P109Header 4R268100RR269100RC152100nL103FBGNDC147100NGNDRXDTXDMCLR3V3SGNDPGCLKPGDATA12345CON103ICSPR222100RR219100RR225100RR228100RR231100RR235100R123456789101112131415161718192021222324252627282930313233343536P100TO AMP board AVPPiVPNiSCLS DAR1260RR1230RR1280RR1300RGPOa0R1330RGNDVDR-VDR+17.5V-17.5

47、VR1310RR1350RAudioS5VSVCLIP0becQ105DTC114EKAD124ss12G1OUT2IN3O4U108ASM1117-3.3C155100nC158100n5VS3V3SC15122u/6V33V3SGNDL102742792662C15910nGNDR1210RGNDC10110NC10210NGNDGNDR1190RR1200R123456789101112131415161718192021222324252627282930313233343536P101TO AMP board AVPPiVPNiS CLS DAR1690RR1680RR1700RR1

48、720RGPOa1R1770RGPOb1GNDVDR-VDR+17.5V-17.5VR1740RGPI1R1780RAudioS5VSVCLIP1R1653K9GNDC10810NC10910NGNDGNDR1580RR1610RD1124V7D1134V7GNDGNDD1144V7GNDD1054V7D1064V7GNDGNDD1074V7GND123456P105From PS UVDR-VDR+VPPVPNiGNDGNDPS _ENVAUX+VAUX-nFATALOVLnAMPONAMPOFFOVLnAM PON12348765FB100100M/600RR229100RR232100R

49、R233100RR223100RSTBYQ131DTA114R1861003V3SC124100NC129100NC122100NC132100NR2400RR2440RS DAS CLR2011kR2020RGNDVAUXaC125100ND1183V6GNDR18510KVAUXa3V3SGNDR13910 0RC1072N2R141100RR14 42.5mRR17322KR17922KD11015VR18 07K5GNDC11510nR16447KC1141U231U102ATL084657U102BTL084C112470NR152330KR153330KGNDR15110KR167

50、10KGNDQ1172SA1312131214U102CTL084R16312KR17 61KGNDR136200RR137200RVCLIP0VCLIP19108U102DTL084VPPiVPNiVPNiVPPGNDGND411U102ETL084-17.5V+17.5VC1162N2C1172N2GND231U100ALM324657U100BLM324131214U100CLM3249108U100DLM324R10147KR1001KR1125K6R1135K6Q1042SA13125VAR1225K1GNDR111100KR11 515 KR12 515 KR129100KGND5