NAD-M25-pwr-sm 维修电路原理图.pdf

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1、SERVICE MANUALSERVICE MANUALM25 C/AHMODEL :M3SERVICE MANUAL NAD 2005NAD ELECTRONICS INTERNATIONALTORONTOM25 C/AHSEVEN CHANNEL AMPLIFIERM25 C/AHSEVEN CHANNEL AMPLIFIERSEVEN CHANNEL AMPLIFIERRadioFans.CN 收音机爱 好者资料库CONTENTSFRONT PANEL/REAR PANELVIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

2、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?3SPECIFICATIONS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 4ALIGNMENT PROCEDURE/ALIGNMENT POINTS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?5-6WIRING DIAGRAM? ? ? ? ? ? ? ?

3、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?7SCHEMATIC DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?8-16PCB LAYOUT? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

4、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 17-23ELECTRICALPARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?24-40EXPLODED VIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

5、 ? ? ? ? ? ? ? ? 41-44EXPLODED VIEW PARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?45PACKING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?46SERVICE SAFETY PRECAUTIONS1

6、. Replacing the FusesCAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIREREPLACE ONLY WITH SAME TYPE OF FUSE.REFERENCE NO.PART NUMBERDESCRIPTIONRear PanelAH20-11203-10MDAT20AL/250VC20-12103-20MDAT10AL/250VAMP BoardF101/F10220-12632-00T6.3AL/250VPSU BoardF201-F20420-12162-01T1.6AL/250VNOTE:*AH

7、: North American version only*C: European version only2. Safety-check out (North American model only)Before returning the product to the customer, make leakage current orresistance measurements to determine that exposed parts are acceptablyinsulated from the supply circuit.Parts marked with the symb

8、olare critical with regard to the risk of fire andelectric shock.Replace only parts recommended by the manufacturer.- 2 -RadioFans.CN 收音机爱 好者资料库FRONT PANEL / REAR PANEL VIEWFRONT PANEL CONTROLS1. POWER SWITCH2. POWER INDICATOR3. SOFT CLIPPING INDICATOR4. PROTECTION INDICATOR1. AC INLET2. INPUT JACK3

9、. LEVEL CONTROL4. SPEAKER TERMINALS5. AUTO TRIGGER SWITCH6. 12V TRIGGER INPUT7. SOFT CLIPPING SWITCH8. MAINS FUSE9. GROUND TERMINAL- 3 - 4 -SPECIFICATIONSCONTINUOUS AVERAGE POWER?160 W (22.0 dBW)OUTPUT INTO 8 OHMS OR 4 OHMS(Min. power per channel, 20 Hz 20 kHz, bothchannels driven, with no more than

10、 rateddistortion)Rated Distortion?0.03%(THD 20 Hz 20 kHz)Clipping power?180 W(maximum continuous power per channel).IHF dynamic power(Maximum short term power per channel)8 ohms:?220 W (23.4 dBW)4 ohms:?385 W (25.9 dBW)2 ohms:?485 W (26.9 dBW)Damping factor180(ref. 8 ohms 50Hz)Input ImpedanceR = 1 M

11、ohmsC = 180 pFInput sensitivity (for rated output into 8 ohms)1250mV+/-50mVVoltage gain29 dBFrequency response 20 Hz 20 kHz?0.2 dB- 3dB at 3 Hz/70 kHzSignal / Noise ratio, A-weighted96 dB ref. 1 W118 dB ref. 160WDIMENSIONS AND WEIGHTSNet Weight44.5 kg (98.0 Ib)Shipping Weight53 kg (116.7 Ib)Dimensio

12、n (WHD)435 200 465.6mmALIGNMENT PROCEDUREA. THERMAL SENSE ADJUSTMENTThis adjustment should be always done when the M25 is cool condition. (That means thetemperature inside the unit should be almost same as the ambient temperature.Connector P208B that connects the transformer and power board should b

13、e removed toavoid that the Idling current heats up the unit excessively) At ambient temperature of 25 Cdegrees and when the unit is just turned on (still in cool condition), adjust the potRV103(as marked as “Thermal Sense ADJ” in below drawing) for a voltage between theTHERMAL TEST POINT and AGND to

14、 be 750mV+/-10mV. If the ambient temperature isdifferent, the voltage setting should be changed by 20mV per degree difference. So at20C degrees, the voltage should be 850mV+/-10mV; and at 30C degrees, the voltageshould be 650mV+/-10mV, etc.B. DC OFFSET VOLTAGEThe DC OFFSET between OFFSET Test Point

15、and AGND must be within 0+/-3mV. If itsfound to be out of this range, change the TL084BCD to one selected for low offset voltageto meet the requirement.C. IDLING CURRENTThe idling current in the output stage of the poweramp should be set to 40mA+/-10mAper pnp-npn transistor pair( This means the mid

16、point voltage is 17.6mV with down limit of13.2mV and up limit of 22mV). The alignment procedure is: At first, adjust RV102 (Markedas “Idling Current ADJ” in the drawing below) for a voltage of 17.6mV +/- 1mV betweenTest point 1 and 2. Then preheat the unit for 5 minutes, let idling current settled a

17、nd thenreadjust to 17.6mV +/- 1mV.Pls note:1.The idling current must be adjusted when all modules are assembled into the unit.2.Though the idling current is set as 17.6mV +/-1mV during the adjustment, due to theinfluence of varied ambient temperature and mains voltage etc., the idling current will d

18、riftafter some time. During the normal checking of idling current in the service field, itsacceptable as long as the voltage is in the range of 13.2mV22.0mV.D. ISC Current sense zero-set.The ISC current-sensing voltage at no signal should be 0mV+/-50mV. During factoryalignment, it is set to 0mV+/-10

19、mV . That is to adjust Pot RV104 (as marked as “ISCSENSE ADJ” in the below drawing) to get a voltage between the “ISC SENSE TESTPOINT” and AGND to be 0mV+/-10mV.(Pls note the ISC should be adjusted when all modules are plugged in. Its not possible to get0mV +/-10mV if any of the modules are removed.

20、)E. Fan Cut Off Point AdjustmentCheck the Fan sense voltage first. Turn Pot RV201 to the end clockwise and confirm TP2of J201 is in negative voltage. Run the unit to heat it up and drive the fan to start turning,- 5 -for example, all 7 channels at 50W/4ohms for 10 minutes or 5 minutes or even less (

21、aslong as the fan can starts turning). Turn off the signal but still keep the unit operating for 1minute. Then run all 7 channels at 1kHz, 0.25W at 4 ohms load, monitor the voltage atTP1 of Pot RV201. Adjust RV201 to get the voltage from negative to positive to ensurethat the Fans are turned off. Th

22、en run all 7 channels at 1kHz, 0.5W at 4 ohmsload, monitor if the voltage at TP1 of Pot RV201 is negative, if not, adjust Pot RV201 justto the point that TP1 changes from positive to negative (to get the fans just start turning).Finally, turn off the signal and monitor if fans stop turning within ab

23、out 30s Max.- 6 -ISC SENSE ADJAGNDACINACINACOUTACOUT+5V+5VRELAYRELAYSC NPNSC PNP+18V-18V+70V-70VPROTECTSENAC OFF+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGND

24、AGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC

25、 OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROT1SEN1ACOFFSCN_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_1+62V_4+18V-18V+70V-70VPROT2SEN2ACOFFSCN_4SCP_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_2+62V_4+18V-18V+70V-70VPROT3SEN3ACOFFSCN_4SCP_4+62V_4-62V_4-62V_4AGND4AGND4AGND4

26、ISCTRIG_3+62V_4+18V-18V+70V-70VPROT4SEN4ACOFFSCN_4SCP_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_4+62V_4+18V-18V+70V-70VPROT5SEN5ACOFFSCN_3SCP_3+62V_3-62V_3-62V_3AGND6AGND6AGND6ISCTRIG_5+62V_3+18V-18V+70V-70VPROT6SEN6ACOFFSCN_3SCP_3+62V_3-62V_3-62V_3AGND6AGND6AGND6ISCTRIG_6+62V_3+18V-18V+70V-70VPROT7

27、SEN7ACOFFSCN_3SCP_3+62V_3-62V_3-62V_3AGND6AGND6AGND6ISCTRIG_7+62V_3+62V_4+62V_4-62V_4-62V_4AGND4AGND4AGND4AGND4AGND6AGND6AGND6AGND6+62V_3+62V_3-62V_3-62V_3SCLEDSCLEDDGNDDGNDPROT7PROT1PROT6PROT2PROT5PROT3PROT4+8V+8VSTBYSTBYISCTRIG_4ISCTRIG_3DGNDISCTRIG_2ISCTRIG_1SEN5AGNDSEN4SEN6SEN3SEN7ISCTRIG_7SEN2S

28、EN1ISCTRIG_6ISCTRIG_5DGND+18V-18V+70VACOFF-70VFAN2FAN3AGNDFAN1FAN1DGNDFAN2DGNDFAN3DGNDSCP_4+8VDGNDSCLEDSCN_4SCP_3SCN_3+62V_3-62V_3SCP_4-62V_4+62V_4STBY+8VDGNDSCLEDSCN_4SCP_3SCN_3+62V_3-62V_3SCP_4-62V_4+62V_4STBYDGNDPROT7AGNDPROT1PROT6PROT2PROT5PROT3PROT4+8V+8VSCLEDSTBYSTBYSCLEDDGNDISCTRIG_4ISCTRIG_3

29、DGNDISCTRIG_2ISCTRIG_1SEN5AGNDSEN4SEN6SEN3SEN7ISCTRIG_7SEN2SEN1ISCTRIG_6ISCTRIG_5DGND+18V-18V+70VACOFF-70VFAN2FAN3AGNDFAN1AGND4AGND4AGND4AGND4+62V_4+62V_4-62V_4-62V_4AGND6AGND6AGND6AGND6+62V_3+62V_3-62V_3-62V_3PROT1+12VDPROT6PROT2SCLEDPROT3STBYLEDPROT4PROT3PROT5PROT4PROT5+5VDPROT7DGNDDGNDPROT1+12VDP

30、ROT6PROT2SCLEDPROT3STBYLEDPROT4PROT3PROT5PROT4PROT5+5VDPROT7DGNDDGND+12V-12V+18V-18V+70V-70V-62V_4+62V_4-62V_3+62V_3+/-12V digital voltageregulators+/-18V analog voltageregulators+/-70V analog voltageregulatorsHigh current 4 channelanalog voltage rectifyHigh current 3 channelanalog voltage rectifyPO

31、WERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDTRIG&SC BOARDCONNECTION BOARDPOWER SUPPLY BOARDSTANDBY BOARDPOWER SWITCH BOARDLED DISPLAY BOARDTO P209BTO P208BTO P501BTO P502BTO P504BTO P505B12P101AP101A123456789P622BP622B12P301AFLEX 16PIN 1.0mmP301AFL

32、EX 16PIN 1.0mm12345678910111213141516P616BP616B123456789P202AP202A12345678P611BP611B123456789P620BP620B12345678P503BP503B12P102AP102A123456789FAN2FAN212P608BP608B123456789P618BP618B123456789101112P101AP101A1234567891234P101AP101A123456789P613BP613B123456789P201AP201A12345678P204BP204B123456789101112

33、13141516P207BP207B1234P619BP619B12345678P504BP504B12P206BFLEX 16PIN 1.0mmP206BFLEX 16PIN 1.0mm12345678910111213141516P801AP801A12P102AP102A123456789P502BP502B12P401BP401B123456789101112P621BP621B12P610BP610B123456789P605BP605B123456789P101AP101A123456789P615BP615B123456789P102AP102A123456789P601BP60

34、1B12345678910111213141516P603BP603B12345678910P102AP102A123456789P203BP203B12345678910FAN1FAN112P607BP607B123456789P205BP205B12345678910111213141516P209BP209B12345P101AP101A123456789P101AP101A12345678912P505BP505B1234P617BP617B123456789P612BP612B123456789P602BP602B12345678910111213141516P102AP102A12

35、345678912345P506BP506B1234FAN3FAN312123P609BP609B123456789P604BP604B123456789t t12345678910111213141516P101AP101A123456789P208BP208B1234512P614BP614B123456789P623BP623B12P102AP102A123456789P501BP501B1212345P102AP102A123456789P606BP606B123456789- 7 -WIRING DIAGRAMINPUTOFFSETISCTRIG+62VSEN62VTESTPOINT

36、 5+12V-12V+12V-12V+12V-12V-12VOFFSET+62VSENISC62VINPUTTP5SC NPNSC PNP/1KV/1/2W/1%TEMP SENAll Polyester capacitors are 63V unless noted.All Elec. capacitors are 50V unless noted.All Resistor are 1/6W RJ13 unless noted./1KV/1KV/1KV/1%/1%/1%/3W/1%/1%INPUT BUFFER/16V/1KVISC COMPARATOR/1%I/V/1/2W/1KV/1KV

37、/1KVSMD 0805SMD 0805C103180pFC103180pFC10810nFC10810nFCWRV104100KCWRV104100K132Q144MPSA92Q144MPSA92R11782R11782R1E31.5KR1E31.5K+C1491uF+C1491uFD1341N4148D1341N4148R1A70.05R1A70.05R1061KR1061KC10222pFC10222pFR1161.8KR1161.8KR1A210KR1A210KR1201KR1201KQ1452SC4793Q1452SC4793R1A647KR1A647KR1101KR1101KC15

38、3470pFC153470pFR118470R118470R123100R123100C111100nFC111100nFR1151KR1151K+C1511uF+C1511uFR1211KR1211KR111ATOR111ATOQ1102SC1815Q1102SC1815+C110100uF+C110100uFQ1092SC2240Q1092SC2240C11622pFC11622pFC1151nFC1151nFD1306.8VD1306.8VD1351N5404D1351N5404R112976R112976R10982R10982D132BAV21D132BAV21C10715pFC10

39、715pFR1A96.8KR1A96.8KR1A5220KR1A5220KJ101RCAJ101RCA12+-IC104ATL082CP+-IC104ATL082CP321Q1042SC2240Q1042SC2240R1022.2megR1022.2megR1192.2megR1192.2megD1331N4148D1331N4148R199220KR199220KR1G1100R1G1100+C1131uF+C1131uFQ1122SK170Q1122SK170D1011N4148D1011N4148R11422KR11422KC1011nFC1011nFQ1062SC2240Q1062SC

40、2240R1E13.3KR1E13.3KF101T6.3AL/250VF101T6.3AL/250VR1A1220KR1A1220KG1G1Ground Solder TapG1G1Ground Solder Tap1C10610pFC10610pFQ1012SA970Q1012SA970C100180pFC100180pFR1A3470KR1A3470KC114100nFC114100nF+-IC104BTL082CP+-IC104BTL082CP56784R1E0470KR1E0470KQ1132SA970Q1132SA970Q1112SA1015Q1112SA1015R1E233KR1E

41、233KQ1032SA970Q1032SA970R11382R11382C1G1100nFC1G1100nFQ1082SA970Q1082SA970D1314.7VD1314.7VQ1072SC2240Q1072SC2240+C1481uF+C1481uFR1081KR1081KC1041nFC1041nFQ1002SK170Q1002SK170R1A4220KR1A4220KR198100KR198100KC10547pFC10547pFR122100R122100Q1052SC2240Q1052SC2240Q143MPSA92Q143MPSA92R103470R103470CWRV1035

42、00CWRV103500132C10922pFC10922pFR100470R100470R1A0390KR1A0390KR1052.2megR1052.2megR10147R10147D1001N4148D1001N4148CWRV1015KACWRV1015KA13245R1A8100R1A8100+C1501uF+C1501uFR1041KR1041KQ1022SK170Q1022SK170R1071KR1071K+C1121uF+C1121uFD129BAV21D129BAV21SCHEMATICS DIAGRAM- 8 -+62V-62V+68VISCTRIGAGNDSC NPNOU

43、TPUTOUTPUTAC OFFAGND-62VAGNDAC OFFSC PNP-62VSEN-18VPROTECT-68V+62V+18VOFFSETISCTRIGTP2TP1SENOFFSETAGNDSC NPNSC PNPAGNDTP5TP5SENAGNDAGND-18V-18VPROTECTPROTECTPROTECTPROTECT+68V-68V+68VAGND+18VAC OFF-62V-68V-18VPROTECT+62V+12V+12V+12V-12V-12V+12V-12V-12V+12V+12VOFFSET+62V62VSC NPNSC PNPINPUTISCTP5SENP

44、OWER ON/OFF DETECTDC OFFSET DETECTCURRENT DETECTMUST USE UL&CSA CERTIFIED/1%/1KV/1KV/1KV/250V/1KV/250V/250V/25V/25V/25V/25V/25VCONNECT TO CONNECTION BOARDCOPPER STRIPS/1/2W/1W/1W/1W/2W/5W/5W/5W/5W/1W/1W/1%/1%IDLING CURRENT SETTING:ADJUST RV102 LET VOLTAGE BETWEEN TP101 AND TP102: 17.6mVFAN&ISC SENSI

45、TIVITY SETTINGADJUST RV103 LET VOLTAGE AT SEN PORT: +750mV/25DegRESISTORS ARE CARBON FILM 1/6W UNLESS SPECIFIEDOUTecbGNDeGND2SK170TO-92OUTTO-2202SA18372SC4793INb2SA9702SA10152SC18152SC2240bcTO-92TO-922N4403MPSA42MPSA92SGecTO-220cNJM79M12Ab2SA13602SC3423INTO-126TO-220DeNJM78M12Aebc2SA19432SC5200TO-26

46、4/1/4W/1/2W/1KV/16V/16V/1KV/6.3VAll Polyester capacitors are 63V unless noted.All Elec. capacitors are 50V unless noted.All Resistor are 1/6W RJ13 unless noted./1KV/1KV/250V/1KV/250V/250V/100V/100V/1KV/1KV/1/4W/1/4WTP2TP1SENOFFSETTP5AGNDQ1192SA1015Q1192SA1015R1301KR1301KR1N4220KR1N4220KC133470pFC133

47、470pFQ1182SA1015Q1182SA1015D1131N4148D1131N4148D1191N4148D1191N4148+C117100uF+C117100uFR134100R134100R1P62KR1P62KC156100nFC156100nFD1141N4148D1141N4148Q1252SC2240Q1252SC2240R18010KR18010KR137180R137180R1503.9KR1503.9KR1P12KR1P12KR1274.7KR1274.7KR132100R132100R18420KR18420KQ127MPSA92Q127MPSA92C16147n

48、FC16147nFR14747KR14747KR1582.2R1582.2R1P4100R1P4100D109L-513ADD109L-513ADR1421KR1421KC13568pFC13568pFR12410KR12410K+C15710uF+C15710uFR195100KR195100KR1612.2R1612.2P102AMOLEX 41662 RIGHT ANGLEP102AMOLEX 41662 RIGHT ANGLE112233445566778899R189510KR189510KD1271N4148D1271N4148R1620.22R1620.22P101AMOLEX

49、41662 RIGHT ANGLEP101AMOLEX 41662 RIGHT ANGLE112233445566778899R143100R143100C141100nFC141100nFD1241N4148D1241N4148R157100R157100C123100nFC123100nFQ1312SA1837Q1312SA1837C120100nFC120100nF+C127100uF+C127100uFD1391N4148D1391N4148CB10190deg THERMAL CIRCUIT BREAKERCB10190deg THERMAL CIRCUIT BREAKER12R16

50、50.22R1650.22C12910nFC12910nFD1281N4148D1281N4148+C122100uF+C122100uFRNI3N.I.RNI3N.I.+C1341000uF+C1341000uFR1640.22R1640.22R139100R139100R1N6220R1N6220R1452.78KR1452.78KR1521.43KR1521.43KR18122KR18122KD138BAV21D138BAV21R19720KR19720KR1922.21KR1922.21KCWRV102300CWRV102300132D1201N4148D1201N4148Q1142S