NAD-M25-pwr-sm维修电路原理图.pdf

《NAD-M25-pwr-sm维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《NAD-M25-pwr-sm维修电路原理图.pdf（46页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL SERVICE MANUAL M25 C/AH MODEL :M3SERVICE MANUAL NAD 2005 NAD ELECTRONICS INTERNATIONAL TORONTO M25 C/AH SEVEN CHANNEL AMPLIFIER M25 C/AH SEVEN CHANNEL AMPLIFIER SEVEN CHANNEL AMPLIFIER RadioFans.CN 收音机爱 好者资料库 CONTENTS FRONT PANEL/REAR PANELVIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

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

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

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

5、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 41-44 EXPLODED VIEW PARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?45 PACKING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?46 SERV

6、ICE SAFETY PRECAUTIONS 1. Replacing the Fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. REFERENCE NO.PART NUMBERDESCRIPTION Rear Panel AH20-11203-10MDAT20AL/250V C20-12103-20MDAT10AL/250V AMP Board F101/F10220-12632-00T6.3AL/250V PSU Board F201-F

7、20420-12162-01T1.6AL/250V NOTE: *AH : North American version only *C: European version only 2. Safety-check out (North American model only) Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the

8、supply circuit. Parts marked with the symbolare critical with regard to the risk of fire and electric shock.Replace only parts recommended by the manufacturer. - 2 - RadioFans.CN 收音机爱 好者资料库 FRONT PANEL / REAR PANEL VIEW FRONT PANEL CONTROLS 1. POWER SWITCH 2. POWER INDICATOR 3. SOFT CLIPPING INDICAT

9、OR 4. PROTECTION INDICATOR 1. AC INLET 2. INPUT JACK 3. LEVEL CONTROL 4. SPEAKER TERMINALS 5. AUTO TRIGGER SWITCH 6. 12V TRIGGER INPUT 7. SOFT CLIPPING SWITCH 8. MAINS FUSE 9. GROUND TERMINAL - 3 - RadioFans.CN 收音机爱 好者资料库 - 4 - SPECIFICATIONS CONTINUOUS AVERAGE POWER?160 W (22.0 dBW) OUTPUT INTO 8 O

10、HMS OR 4 OHMS (Min. power per channel, 20 Hz 20 kHz, both channels driven, with no more than rated distortion) 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 oh

11、ms:?385 W (25.9 dBW) 2 ohms:?485 W (26.9 dBW) Damping factor180 (ref. 8 ohms 50Hz) Input ImpedanceR = 1 Mohms C = 180 pF Input sensitivity (for rated output into 8 ohms)1250mV+/-50mV Voltage gain29 dB Frequency response 20 Hz 20 kHz?0.2 dB - 3dB at 3 Hz/70 kHz Signal / Noise ratio, A-weighted96 dB r

12、ef. 1 W 118 dB ref. 160W DIMENSIONS AND WEIGHTS Net Weight44.5 kg (98.0 Ib) Shipping Weight53 kg (116.7 Ib) Dimension (WHD)435 200 465.6mm RadioFans.CN 收音机爱 好者资料库 ALIGNMENT PROCEDURE A. THERMAL SENSE ADJUSTMENT This adjustment should be always done when the M25 is cool condition. (That means the tem

13、perature inside the unit should be almost same as the ambient temperature. Connector P208B that connects the transformer and power board should be removed to avoid that the Idling current heats up the unit excessively) At ambient temperature of 25 C degrees and when the unit is just turned on (still

14、 in cool condition), adjust the pot RV103(as marked as “Thermal Sense ADJ” in below drawing) for a voltage between the THERMAL TEST POINT and AGND to be 750mV+/-10mV. If the ambient temperature is different, the voltage setting should be changed by 20mV per degree difference. So at 20C degrees, the

15、voltage should be 850mV+/-10mV; and at 30C degrees, the voltage should be 650mV+/-10mV, etc. B. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-3mV. If its found to be out of this range, change the TL084BCD to one selected for low offset voltage to meet the requ

16、irement. C. IDLING CURRENT The idling current in the output stage of the poweramp should be set to 40mA+/-10mA per pnp-npn transistor pair( This means the mid point voltage is 17.6mV with down limit of 13.2mV and up limit of 22mV). The alignment procedure is: At first, adjust RV102 (Marked as “Idlin

17、g Current ADJ” in the drawing below) for a voltage of 17.6mV +/- 1mV between Test point 1 and 2. Then preheat the unit for 5 minutes, let idling current settled and then readjust to 17.6mV +/- 1mV. Pls note: 1.The idling current must be adjusted when all modules are assembled into the unit. 2.Though

18、 the idling current is set as 17.6mV +/-1mV during the adjustment, due to the influence of varied ambient temperature and mains voltage etc., the idling current will drift after some time. During the normal checking of idling current in the service field, its acceptable as long as the voltage is in

19、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 factory alignment, it is set to 0mV+/-10mV . That is to adjust Pot RV104 (as marked as “ISC SENSE ADJ” in the below drawing) to get a voltage between the “ISC SENSE TES

20、T POINT” and AGND to be 0mV+/-10mV. (Pls note the ISC should be adjusted when all modules are plugged in. Its not possible to get 0mV +/-10mV if any of the modules are removed.) E. Fan Cut Off Point Adjustment Check the Fan sense voltage first. Turn Pot RV201 to the end clockwise and confirm TP2 of

21、J201 is in negative voltage. Run the unit to heat it up and drive the fan to start turning, - 5 - RadioFans.CN 收音机爱 好者资料库 for example, all 7 channels at 50W/4ohms for 10 minutes or 5 minutes or even less (as long as the fan can starts turning). Turn off the signal but still keep the unit operating f

22、or 1 minute. Then run all 7 channels at 1kHz, 0.25W at 4 ohms load, monitor the voltage at TP1 of Pot RV201. Adjust RV201 to get the voltage from negative to positive to ensure that the Fans are turned off. Then run all 7 channels at 1kHz, 0.5W at 4 ohms load, monitor if the voltage at TP1 of Pot RV

23、201 is negative, if not, adjust Pot RV201 just to 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 about 30s Max. - 6 - ISC SENSE ADJ RadioFans.CN 收音机爱 好者资料库 AGND ACINACIN ACOUTACOUT +5V+5V

24、 RELAYRELAY SC NPN SC PNP +18V -18V +70V -70V PROTECT SEN AC OFF +62V -62V -62V AGND AGND AGND ISC TRIG AGND +62V +18V -18V +70V -70V PROTECT SEN AC OFF SC NPN SC PNP +62V -62V -62V AGND AGND AGND ISC TRIG AGND +62V +18V -18V +70V -70V PROTECT SEN AC OFF SC NPN SC PNP +62V -62V -62V AGND AGND AGND I

25、SC TRIG AGND +62V +18V -18V +70V -70V PROTECT SEN AC OFF SC NPN SC PNP +62V -62V -62V AGND AGND AGND ISC TRIG AGND +62V +18V -18V +70V -70V PROTECT SEN AC OFF SC NPN SC PNP +62V -62V -62V AGND AGND AGND ISC TRIG AGND +62V +18V -18V +70V -70V PROTECT SEN AC OFF SC NPN SC PNP +62V -62V -62V AGND AGND

26、AGND ISC TRIG AGND +62V +18V -18V +70V -70V PROTECT SEN AC OFF SC NPN SC PNP +62V -62V -62V AGND AGND AGND ISC TRIG AGND +62V +18V -18V +70V -70V PROT1 SEN1 ACOFF SCN_4 +62V_4 -62V_4 -62V_4 AGND4 AGND4 AGND4 ISCTRIG_1 +62V_4 +18V -18V +70V -70V PROT2 SEN2 ACOFF SCN_4 SCP_4 +62V_4 -62V_4 -62V_4 AGND4

27、 AGND4 AGND4 ISCTRIG_2 +62V_4 +18V -18V +70V -70V PROT3 SEN3 ACOFF SCN_4 SCP_4 +62V_4 -62V_4 -62V_4 AGND4 AGND4 AGND4 ISCTRIG_3 +62V_4 +18V -18V +70V -70V PROT4 SEN4 ACOFF SCN_4 SCP_4 +62V_4 -62V_4 -62V_4 AGND4 AGND4 AGND4 ISCTRIG_4 +62V_4 +18V -18V +70V -70V PROT5 SEN5 ACOFF SCN_3 SCP_3 +62V_3 -62V

28、_3 -62V_3 AGND6 AGND6 AGND6 ISCTRIG_5 +62V_3 +18V -18V +70V -70V PROT6 SEN6 ACOFF SCN_3 SCP_3 +62V_3 -62V_3 -62V_3 AGND6 AGND6 AGND6 ISCTRIG_6 +62V_3 +18V -18V +70V -70V PROT7 SEN7 ACOFF SCN_3 SCP_3 +62V_3 -62V_3 -62V_3 AGND6 AGND6 AGND6 ISCTRIG_7 +62V_3+62V_4 +62V_4 -62V_4 -62V_4 AGND4 AGND4 AGND4

29、AGND4 AGND6 AGND6 AGND6 AGND6 +62V_3 +62V_3 -62V_3 -62V_3 SCLED SCLED DGND DGND PROT7 PROT1 PROT6 PROT2 PROT5 PROT3 PROT4 +8V +8V STBY STBY ISCTRIG_4 ISCTRIG_3 DGND ISCTRIG_2 ISCTRIG_1 SEN5 AGND SEN4 SEN6 SEN3 SEN7 ISCTRIG_7 SEN2 SEN1 ISCTRIG_6 ISCTRIG_5 DGND +18V -18V +70V ACOFF -70V FAN2 FAN3 AGND

30、 FAN1 FAN1 DGND FAN2 DGND FAN3 DGND SCP_4 +8V DGND SCLED SCN_4 SCP_3 SCN_3 +62V_3 -62V_3 SCP_4 -62V_4 +62V_4 STBY +8V DGND SCLED SCN_4 SCP_3 SCN_3 +62V_3 -62V_3 SCP_4 -62V_4 +62V_4 STBY DGND PROT7 AGND PROT1 PROT6 PROT2 PROT5 PROT3 PROT4 +8V +8V SCLED STBY STBY SCLED DGND ISCTRIG_4 ISCTRIG_3 DGND IS

31、CTRIG_2 ISCTRIG_1 SEN5 AGND SEN4 SEN6 SEN3 SEN7 ISCTRIG_7 SEN2 SEN1 ISCTRIG_6 ISCTRIG_5 DGND +18V -18V +70V ACOFF -70V FAN2 FAN3 AGND FAN1 AGND4 AGND4 AGND4 AGND4 +62V_4 +62V_4 -62V_4 -62V_4 AGND6 AGND6 AGND6 AGND6 +62V_3 +62V_3 -62V_3 -62V_3 PROT1 +12VD PROT6 PROT2 SCLED PROT3 STBYLED PROT4 PROT3 P

32、ROT5 PROT4 PROT5 +5VD PROT7 DGND DGND PROT1 +12VD PROT6 PROT2 SCLED PROT3 STBYLED PROT4 PROT3 PROT5 PROT4 PROT5 +5VD PROT7 DGND DGND +12V -12V +18V -18V +70V -70V -62V_4 +62V_4 -62V_3 +62V_3 +/-12V digital voltage regulators +/-18V analog voltage regulators +/-70V analog voltage regulators High curr

33、ent 4 channel analog voltage rectify High current 3 channel analog voltage rectify POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD TRIG&SC BOARD CONNECTION BOARD POWER SUPPLY BOARD STANDBY BOARD POWER SWITCH BOARD LED DISPLAY BOARD TO P209BTO

34、P208B TO P501BTO P502B TO P504BTO P505B 1 2 P101AP101A1 2 3 4 5 6 7 8 9 P622BP622B 1 2 P301A FLEX 16PIN 1.0mm P301A FLEX 16PIN 1.0mm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P616BP616B 1 2 3 4 5 6 7 8 9 P202AP202A 1 2 3 4 5 6 7 8 P611BP611B 1 2 3 4 5 6 7 8 9 P620BP620B 1 2 3 4 5 6 7 8 P503BP503B 1 2 P

35、102AP102A 1 2 3 4 5 6 7 8 9 FAN2FAN2 1 2 P608BP608B1 2 3 4 5 6 7 8 9 P618BP618B 1 2 3 4 5 6 7 8 9 10 11 12 P101AP101A1 2 3 4 5 6 7 8 9 1 2 3 4 P101AP101A1 2 3 4 5 6 7 8 9 P613BP613B 1 2 3 4 5 6 7 8 9 P201AP201A 1 2 3 4 5 6 7 8 P204BP204B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P207BP207B 1 2 3 4 P619

36、BP619B 1 2 3 4 5 6 7 8 P504BP504B 1 2 P206B FLEX 16PIN 1.0mm P206B FLEX 16PIN 1.0mm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P801AP801A 1 2 P102AP102A 1 2 3 4 5 6 7 8 9 P502BP502B 1 2 P401BP401B 1 2 3 4 5 6 7 8 9 10 11 12 P621BP621B 1 2 P610BP610B1 2 3 4 5 6 7 8 9 P605BP605B1 2 3 4 5 6 7 8 9 P101AP101

37、A1 2 3 4 5 6 7 8 9 P615BP615B 1 2 3 4 5 6 7 8 9 P102AP102A 1 2 3 4 5 6 7 8 9 P601BP601B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P603BP603B 1 2 3 4 5 6 7 8 9 10 P102AP102A 1 2 3 4 5 6 7 8 9 P203BP203B 1 2 3 4 5 6 7 8 9 10 FAN1FAN1 1 2 P607BP607B1 2 3 4 5 6 7 8 9 P205BP205B 1 2 3 4 5 6 7 8 9 10 11 12 1

38、3 14 15 16 P209BP209B 1 2 3 4 5 P101AP101A1 2 3 4 5 6 7 8 9 P101AP101A1 2 3 4 5 6 7 8 9 1 2 P505BP505B 1 2 3 4 P617BP617B 1 2 3 4 5 6 7 8 9 P612BP612B 1 2 3 4 5 6 7 8 9 P602BP602B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P102AP102A 1 2 3 4 5 6 7 8 9 1 2 3 4 5 P506BP506B 1 2 3 4 FAN3FAN3 1 2 12 3 P609B

39、P609B1 2 3 4 5 6 7 8 9 P604BP604B1 2 3 4 5 6 7 8 9 t t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 P101AP101A1 2 3 4 5 6 7 8 9 P208BP208B 1 2 3 4 5 1 2 P614BP614B 1 2 3 4 5 6 7 8 9 P623BP623B 1 2 P102AP102A 1 2 3 4 5 6 7 8 9 P501BP501B 1 2 1 2 3 4 5 P102AP102A 1 2 3 4 5 6 7 8 9 P606BP606B1 2 3 4 5 6 7 8

40、9 - 7 - WIRING DIAGRAM RadioFans.CN 收音机爱 好者资料库 INPUT OFFSET ISCTRIG +62V SEN 62V TESTPOINT 5 +12V -12V +12V -12V +12V -12V -12V OFFSET +62V SEN ISC 62V INPUT TP5 SC NPN SC PNP /1KV /1/2W /1% TEMP SEN All Polyester capacitors are 63V unless noted. All Elec. capacitors are 50V unless noted. All Resist

41、or are 1/6W RJ13 unless noted. /1KV /1KV /1KV /1% /1% /1% /3W /1% /1% INPUT BUFFER /16V /1KV ISC COMPARATOR /1% I/V /1/2W /1KV /1KV /1KV SMD 0805 SMD 0805 C103 180pF C103 180pF C108 10nF C108 10nF CW RV104 100K CW RV104 100K 13 2 Q144 MPSA92 Q144 MPSA92 R117 82 R117 82 R1E3 1.5K R1E3 1.5K + C149 1uF

42、 + C149 1uF D134 1N4148 D134 1N4148 R1A7 0.05 R1A7 0.05 R106 1K R106 1K C102 22pF C102 22pF R116 1.8K R116 1.8K R1A2 10K R1A2 10K R120 1K R120 1K Q145 2SC4793 Q145 2SC4793 R1A6 47K R1A6 47K R110 1K R110 1K C153 470pF C153 470pF R118 470 R118 470 R123 100 R123 100 C111 100nF C111 100nF R115 1K R115 1

43、K +C151 1uF +C151 1uF R121 1K R121 1K R111 ATO R111 ATO Q110 2SC1815 Q110 2SC1815 + C110 100uF + C110 100uF Q109 2SC2240 Q109 2SC2240 C116 22pF C116 22pF C115 1nF C115 1nF D130 6.8V D130 6.8V D135 1N5404 D135 1N5404 R112 976 R112 976 R109 82 R109 82 D132 BAV21 D132 BAV21 C107 15pF C107 15pF R1A9 6.8

44、K R1A9 6.8K R1A5 220K R1A5 220K J101 RCA J101 RCA 1 2 + - IC104A TL082CP + - IC104A TL082CP 3 2 1 Q104 2SC2240 Q104 2SC2240 R102 2.2meg R102 2.2meg R119 2.2meg R119 2.2meg D133 1N4148 D133 1N4148 R199 220K R199 220K R1G1 100 R1G1 100 + C113 1uF + C113 1uF Q112 2SK170 Q112 2SK170 D101 1N4148 D101 1N4

45、148 R114 22K R114 22K C101 1nF C101 1nF Q106 2SC2240 Q106 2SC2240 R1E1 3.3K R1E1 3.3K F101 T6.3AL/250V F101 T6.3AL/250V R1A1 220K R1A1 220K G1G1 Ground Solder Tap G1G1 Ground Solder Tap 1 C106 10pF C106 10pF Q101 2SA970 Q101 2SA970 C100 180pF C100 180pF R1A3 470K R1A3 470K C114 100nF C114 100nF + -

46、IC104B TL082CP + - IC104B TL082CP 5 6 7 84 R1E0 470K R1E0 470K Q113 2SA970 Q113 2SA970 Q111 2SA1015 Q111 2SA1015 R1E2 33K R1E2 33K Q103 2SA970 Q103 2SA970 R113 82 R113 82 C1G1 100nF C1G1 100nF Q108 2SA970 Q108 2SA970 D131 4.7V D131 4.7V Q107 2SC2240 Q107 2SC2240 + C148 1uF + C148 1uF R108 1K R108 1K

47、 C104 1nF C104 1nF Q100 2SK170 Q100 2SK170 R1A4 220K R1A4 220K R198 100K R198 100K C105 47pF C105 47pF R122 100 R122 100 Q105 2SC2240 Q105 2SC2240 Q143 MPSA92 Q143 MPSA92 R103 470 R103 470 CW RV103 500 CW RV103 500 13 2 C109 22pF C109 22pF R100 470 R100 470 R1A0 390K R1A0 390K R105 2.2meg R105 2.2me

48、g R101 47 R101 47 D100 1N4148 D100 1N4148 CW RV101 5KA CW RV101 5KA 13 2 4 5 R1A8 100 R1A8 100 + C150 1uF + C150 1uF R104 1K R104 1K Q102 2SK170 Q102 2SK170 R107 1K R107 1K + C112 1uF + C112 1uF D129 BAV21 D129 BAV21 SCHEMATICS DIAGRAM - 8 - RadioFans.CN 收音机爱 好者资料库 +62V -62V+68V ISCTRIG AGND SC NPN

49、OUTPUTOUTPUT AC OFF AGND -62V AGND AC OFF SC PNP -62V SEN -18V PROTECT -68V +62V+18V OFFSET ISCTRIG TP2 TP1 SEN OFFSET AGND SC NPN SC PNP AGND TP5 TP5 SEN AGNDAGND -18V-18V PROTECTPROTECTPROTECTPROTECT +68V -68V +68V AGND +18V AC OFF -62V -68V -18V PROTECT +62V +12V +12V +12V -12V -12V +12V -12V -12V +12V +12V OFFSET +62V 62V SC NPN SC PNP INPUT ISC TP5 SEN POWER ON/OFF DETECT DC OFFSET DETECT CURRENT DETECT MUST USE UL&CSA CERTIFIED /1% /1KV /1KV /1KV /250V /1KV /250V /250V /25V /25V /25V /25V /25V CONNECT TO CONNECTION BOARDCOPPER STRIPS /1/2W /1W /1W /1W /2W /5W /5W /5