NAD-M3-int-sm维修电路原理图.pdf

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1、SERVICE MANUAL SERVICE MANUAL M3 C/AH MODEL : M3SERVICE MANUAL NAD 2005 NAD ELECTRONICS INTERNATIONAL TORONTO M3 C/AH INTEGRATE AMPLIFLER M3 C/AH INTEGRATE AMPLIFIER INTEGRATE AMPLIFIER RadioFans.CN 收音机爱 好者资料库 CONTENTS SECTION 1 . . . .SUMMARY SECTION 2 . . . .CABINET CONNECT A 1500 OHM 10 WATT RESI

2、STOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD 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. VOLTA

3、GE MEASURE- MENTS FOR EACH EXPOSED METALLIC PART. VOLT- AGE MEASURED MUST NOT EXCEED 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 EQUI

4、LATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “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

5、OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONS CAUTION: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 b

6、etween the following servicing precautions and any of the safety precautions in this publication, always follow 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 reinstalli

7、ng any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any internal 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 installat

8、ion of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this 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 wi

9、th a pipe cleaner, cottontipped swab, or comparable soft applicator. Unless specified otherwise in this service 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 app

10、ly AC power to this Stereo amplifier and/or any of its electrical assemblies unless all solid-state device heat 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 instrumen

11、t ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the 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

12、 parts (Note 1) should be more than 1 M-ohm. Note 1: Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are c

13、alled Electrostatically Sensitive (ES) Devices. Examples of typical Es devices are integrated circuits and some 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. Immedi

14、ately before handing any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic 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 r

15、eason prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES 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

16、 solder or unsolder ES devices. 4. Use only an antistatic solder removal device. Some solder removal devices not 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 dama

17、ge ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you 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. Immed

18、iately before removing the protective material from the leads of a replacement ES device, touch the protective 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

19、. 8.Minimize bodily motions when handing unpackaged replacement ES devices. (Normally harmless motion such as 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.) 1-3 RadioFans.CN 收音机爱 好者资料库

20、 321 123 ALIGNMENT PROCEDURE A. POWER DRIVEN VOLTAGE(PSU BOARD) Connect a DC Millivoltmeter to TP601/TP701 1 and 2 pin, then adjust VR601/VR701(6.8kohms) for 0V0.1V. B. IDLING CURRENT(AMP BOARD) 1.Connect a DC Millivoltmeter betweenTP301 2 pins, then adjust VR301 (200ohms) for 7-8mV reading on meter

21、. 2.Connect a DC Millivoltmeter between TP401 2 pins, then adjust VR401 (200ohms) for 7-8mV reading on meter. 3. Watch for 10minutes, to make sure it is arround 7mV PSU BOARD AMP BOARD(L/R) 1-4 RadioFans.CN 收音机爱 好者资料库 C. BALANCE INPUTS CMRR 1.Volum set 0dB, Input 2V/10KHZ common mode sinwave signal

22、at L channel Balance input,Connect a AC Millivoltmeter to preout1L then adjust R565 for lowest output level. 2. Volum set 0dB,Input 2V/10KHZ common mode sinwave signal at R channel Balance input,Connect a AC Millivoltmeter to preout1R then adjust R564 for lowest output level. 1-5 RadioFans.CN 收音机爱 好

23、者资料库 Power Amplifier Section Continuous output power into 4/8 ohms 180W (17dBw) (Minimum RMS power per channel, both channels driven, With no more than the rated distortion) Rated distortion (THD)(20Hz 20kHz)0.004% Channel Separation100dB (MAIN IN, 60W Out at 8,1k shorted, 1kHz) Clipping power, 1kHz

24、220W (Maximum continuous power per channel) Dynamic Headroom at 8 ohms4.2dB Dynamic power8ohms280W (Maximum short-term power per channel )4ohms480W 2ohms785W Damping factor150 Signal to noise ratio(refer 1W A-weighted)100dB Slew rate20V/sec T.H.D and SMPTE I.M.0.01% (Distortion from 250mW to rated o

25、utput) IHF I.M. (CCIF IM) and T.I.M distortion0.005% (From 250mW to rated output) Input impedance20k/680pF Input sensitivity rate power into 8ohms) r oF ( 1.38V Power amp gain29dB Preamplifier Section Input Impedance single-ended input150k /500pF SPECIFICATIONS NAD M3 INTEGRATE AMPLIFIER Note: Speci

26、fications are measured in accordance with EIA Standard RS-490 (IHF A-202) for amplifiers 1-6 balanced input120k /100pF RadioFans.CN 收音机爱 好者资料库 Signal-to-Noise ratio110dB ref 500mV (A-weighted, line In, Pre-Out) Rated distortion (THD)(20Hz 21kHz)0.005% Channel Separation 110dB (1kHz 2V Line/balanced

27、IN, 2V Pre-Out) Input Sensitivity320mV for 2V out Input Overload Line input Balanced input 10V Frequency response(5Hz-70KHz)0.01%? NO YES NO 3-4 RadioFans.CN 收音机爱 好者资料库 NO YES B Response change properly? Check U112,17V at tone board Check TONE_STB,OPSEL_DATA OPSEL_CLK signal THE END Press Tone Key t

28、o change tone setting,measure preout response YES Level=2V0.1V THD0.03%? NOCheck U109 U209 U111 U211 Check OPSEL_STB signal Press Z-2/record key to current input channel then measure output level and THD 3-5 RadioFans.CN 收音机爱 好者资料库 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 11MHz C

29、LOCK FIG 1-1 2. AT89C51 reset is high active. FIG 1-2 3-6 RadioFans.CN 收音机爱 好者资料库 3.volume control DATA and CLOCK 4.REC(ZONE) select DATA and CLOCK 3-7 RadioFans.CN 收音机爱 好者资料库 5.Input select DATA and CLOCK 3-8 RadioFans.CN 收音机爱 好者资料库 AC INLETEMI FILTER STANDBY RELAY POWER SWITCH FUSE F901 FUSE F903

30、100mA 250V AH: 5A 250V C: 3.15A 350V FUSE F902 AH: 5A 250V C: 3.15A 350V R-CORE R CHANNEL STANDBY MAIN TRANSFORMER L CHANNEL MAIN TRANSFORMER TRANSFORMER 5V REGULATOR 12V RECTIFY B901 IC1 B902 LOGIC CIRCUIT MCU ON PREAMP LOGIC CIRCUIT ON FPP 12V TRIGGER STANDBY ON BAL RELAY ON PSU 20V RECTIFY 72V RE

31、CTIFY ON PSU B606 ON PSU HIGH CURRENT RECTIFY POWER SUPPLY ON PSU B603 B604 72V REGULATOR B606 ON PSU ISC CIRCUIT ON PSU D602 D603 L CHANNEL ON L AMP AMPLIFIER B605 20V REGULATOR B606 ON PSU PRE AMP ON PRE AMP BALANCE AMP ON BAL OUTPUT RELAYS L CHANNEL ON L AMP L CHANNEL INPUT RELAYS ON PREAMP 20V R

32、ECTIFY 72V RECTIFY ON PSU B606 ON PSU HIGH CURRENT RECTIFY POWER SUPPLY ON PSU B603 B604 72V REGULATOR B606 ON PSU ISC CIRCUIT ON PSU D602 D603 L CHANNEL ON L AMP AMPLIFIER B605 20V REGULATOR B606 ON PSU PRE AMP ON PRE AMP BALANCE AMP ON BAL OUTPUT RELAYS L CHANNEL ON L AMP L CHANNEL INPUT RELAYS ON

33、 PREAMP 1. POWER DISTRIBUTE DIAGRAM 3-9 BLOCK DIAGRAMS RadioFans.CN 收音机爱 好者资料库 INPUT SELECTOR BALANCE AMP DISC CD TUNER INPUT4 INPUT5 INPUT6 BALANCE 0/6.5dB SELECTABLE GAIN AMP STAGE 54dB ATTENUATOR 2dB/STEP 5dB TONE CONTROL 1dB/STEP BIAMP HIGH PASS FILTER 2,2.5,3,3.5dB SELECTABLE GAIN AMP STAGE 30d

34、B ATTENUATOR 10dB/STEP BY PASS, 40, 60, 80, 100Hz PRE OUT1 PRE OUT2 INPUT SELECTOR BALANCE AMP DISC CD TUNER INPUT4 INPUT5 INPUT6 BALANCE 0/6.5dB SELECTABLE GAIN AMP STAGE 54dB ATTENUATOR 2dB/STEP 5dB TONE CONTROL 1dB/STEP BIAMP HIGH PASS FILTER 2,2.5,3,3.5dB SELECTABLE GAIN AMP STAGE 30dB ATTENUATO

35、R 10dB/STEP BY PASS, 40, 60, 80, 100Hz PRE OUT1 PRE OUT2 STEREO/MONO SWITCH 2. PREAMP SIGNAL PATH LEFT CHANNEL RIGHT CHANNEL 3-10 RadioFans.CN 收音机爱 好者资料库 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 P3.0 P3.1 P3.2 P3.3 P3.4 P

36、3.5 P3.6 P3.7 VFD ENCODE KEYS EEPROM U83 MAX3221 (FPP)RJ45 RS232 SOCKET (REAR PANEL) Q85 Q86 (FPP)IR IN/OUT SOCKET ( REAR PANEL) Q89 inverter(FPP)Protect Circuit (High when Protect) Q91 (PSU)OP91 OPTOISO (PSU)RL91 standby relay (PSU) U84 U85 7400 (FPP)D81 Tri-color LED (FPP) P4.0 P4.1 P4.2 P4.3 P4.4

37、 P4.5 P4.6 P4.7 P5.0 P5.1 P5.2 P5.3 P5.4 P5.5 P5.6 P5.7 U108 U113 U208 U213 CD4094 (PRE) RL101 . RL112, RL201 . RL212 For Input Select and Biamp Filter Switch Q130 Q131 Q230 Q231 for Mute U105 (PRE) TC9274 U110 U210 (PRE) CD4094 U104 U107 U204 U207 (PRE) MAX4621 30dB Attenuator, Q101.Q103, Q201.Q203

38、, 6.5 Gain/ 0.5 Gain Switch U205 (PRE) TC9274 U109 U209 (PRE) TC9274 RL301 RL302 RL401 RL402 OUTPUT RELAYS (LAMP/RAMP) U109 U209 (PRE) TC9274 MCU AT89C51 3. SYSTEM CONTROL PATH 3-11 RadioFans.CN 收音机爱 好者资料库 CIRCUIT DIAGRAMS 1.POWER AMPLIFIER BOARD 3-12 C407 33P/250V C402 1N C405 33P/250V C425 470pF R

39、402 22K R403 100 R412 100 R404 100 R413 27K R405 27K R414 100 R406 100 Q413 2SA1837 Q410 2SA1360 Q409 2SA1015 Q405 2SA1015 Q407 2SA970 Q406 2SA970 Q401 2SA970 Q411 2SA3423 Q412 2SC1815 Q408 2SC1815 Q404 2SC2240 Q403 2SC2240 Q402 2SC2240 R408 33 R420 33 R459 10/2W FS R415 10K R423 82 FP 1/2WR421 39K

40、R417 21/1/4W 1% R419 1K2 3W 1% R407 82 R416 22K R428 300 R411 10K R410 22K R426 100K R424 100K R409 82 FP 1/2W D403 1N4148 D404 1N4148 D406 1N4148 D405 1N4148 C408 330P Q414 2SC4793 R430 3R3/0.5W FP R432 330/0.5W FP R434 4K7/3W FP R438 3R3/0.5W FP R441 330/0.5W FP R444 4K7/3W FP R437 18 R429 18 R431

41、 4R7/FS R439 4R7/FS R445 1K2 1% R446 1K 1% Q415 KSC2690 Q417 2SC4793 Q424 2SC5200 Q422 2SC5200 Q418 2SA1837 R457 0.05/5W R456 0.05/5W R448 15 R449 15 R442 10K R433 10K Q421 2SA1943 Q423 2SA1943 C418 0.1uF +74V -74V +72V -72V R401 470 AGND AGND AGND GND GND C403 10uF/50V C404 10uF/50V C411 100UF/25V

42、C412 100u/25V R435 10K R443 10K C416 0.1uF C417 0.1uF C409 0.1uF C410 0.1u/80V AGND AGND Q426 2SA970 Q425 C2240 R464 6K8 C421 4u7/50V R463 22K R461 1K R462 56K C420 22N D409 BV21 Q427 2SA1943 Q428 2SC5200 SPGND R422 1K2 3W 1% GND 23 1IC402 TL431 23 1 IC401 TL431 1 VR401 200 R447 220 Q416 2SA1015 C42

43、2 10uF/80V C423 10uF/80V GND GND R476 220K R477 82 C415 10uF/50V R425 39K R480 2.2 R482 2.2 R484 2.2 R486 2.2 Q419 2SA1943 Q420 2SC5200 R481 2.2 R483 2.2 R485 2.2 R487 2.2 C426 470pFR451 22 GND R450 220K C419 10uF/50VQ437 2SC4793 R488 1 R489 1 Q438 2SA1837 R491 1R490 1 C428 0.1uF IC403A TL082D C427

44、1uF R452 1M R453 680 AGND R495 4K7/3W FP R496 4K7/3W FP C429 1uF R454 1M AGND AGND R418 100 L401 100uH RL402A RL402B RL401B RL401A R499 3R3/1W FP L402 1uH C440 22N PRGND R471 56K C431 330u/16V C432 0.22u R469 56K C433 47u/50VGND 1 2 3 4 5 6 7 8 IC404 uPC1237HA +V24R R468 2K2 R467 10K PRGND Q450 2SA1

45、015 R475 200 R474 3K3 R470 3K3 R473 100K R472 N.I. Q452 2SC1815 Q453 2SC1815 D414 1N4148 D415 1N4148 R479 10K R478 10K PRGND PRGND SPGND 1 2 3 4 5 6 7 8 9 10 CZ402 CON10 AC DET PROTECT RT401 T0=80 degree C PRGND SPK A SPK B B401 THERMAL BREAKER R493 0 R492 0 D412 1N4148 D413 1N4148 R494 N.I. 1 2 CZ4

46、01 CON2 AGND IC403B TL082D AGND GND -74V+74V R CHANNEL AMP +72V-72V PRGND Q454 2SA1015 R466 100K R498 10K R497 100K PRGND PRGND R427 20K D401 18V D402 18V C401 0.1uF C406 0.1uF R455 10K/0.6W R458 10K/0.6W +72V -72V Q429 2SC2878 AGND Q430 2SC2240 R41 1K R42 1K2 Q431 2SC3423 Q432 2SA1360 R43 10 R44 10

47、 C414 0.1uF +V24R 1 P401 PCBNUT 1 P402 PCBNUT 1 P403 PCBNUT D423 1N4148 D422 3.6V D424 3.6V D425 1N4148 D417 1N4148 D418 1N4148 D421 1N4148 D420 1N4148 D416 LED D419 LED D427 12V D426 1N4148 C434 2.2uF/50V C435 2.2uF/50V R45 200K GND D411 1N4148 R47 200K R46 4.7K AGND 1 2 3 4 5 6 7 8 CZ403 CON8 C307

48、 33P/250V C302 1N C305 33P/250V C325 470pF R302 22K R303 100 R312 100 R304 100 R313 27K R305 27K R314 100 R306 100 Q313 2SA1360 Q310 2SA1360 Q309 2SA1015 Q305 2SA1015 Q307 2SA970 Q306 2SA970 Q301 2SA970 Q311 2SC3423 Q312 2SC1815 Q308 2SC1815 Q304 2SC2240 Q303 2SC2240 Q302 2SC2240 R308 33 R320 33 R35

49、9 10/2W FS R315 10K R323 82 FP 1/2W R321 39K R317 21/1/4W 1% R319 1K2 3W 1% R307 82 R316 22K R328 300 R311 10K R310 22K R326 100K R324 100K R309 82 FP 1/2W D303 1N4148 D304 1N4148 D306 1N4148 D305 1N4148 C308 330P Q314 2SC3423 R330 3R3/0.5W FP R332 330/0.5W FP R334 4K7/3W FP R338 3R3/0.5W FP R341 330/0.5W FP R344 4K7/3W FP R337 18 R329 18 R331 4R7/FS R339 4R7/FS R345 1K2 %1 R346 1K 1% Q315 KSC2690