NAD-M22-pwr-sm维修电路原理图.pdf

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1、NAD SERVICE MANUAL M22 STEREO AMPLIFIER M22 STEREO AMPLIFIER RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION.3-4 SPECIFICATIONS. 5 WIRING DIAGRAM.6 BLOCK DIAGRAM. .7-9 .12-24 PCB LAYOUT.25-30 ELECTRICAL PARTS LIST.31-50 EXPLODED VIEW. 51-54 EXPLODED VIEW PARTS LIST.55 C

2、IRCUIT DIAGRAMS TROUBLE SHOOTING A GUIDE.10 TROUBLE SHOOTING B GUIDE.11 RadioFans.CN 收音机爱 好者资料库 ? SUBJECT: GRAPHIC SYMBOLS PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS A.C. VOLTMETER GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC PLACE THIS PROBE ON EACH EXPOSED METAL PART CAUTION

3、: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOM- IZED INSTALLATIONS WITHOUT MANUFACTURERS APPROVAL. 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 PERFOR

4、MED ONLY AFTER YOU ARE THOROUGHLY 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 CHECKS AFTER THE O

5、RIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING. SUBJECT : FIRE CONNECT A 1500 OHM 10 WATT RESISTOR, 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. MEASUR

6、E 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 EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT C

7、ONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE COR- RECTED IMMEDIATELY. THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL 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 O

8、F 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. RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONS CAUTION:Before servicing the Stereo amplifier covered by this service

9、 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 follow the safety precautions. Remember Safety First: General Ser

10、vicing 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 internal electrical plug or other electrical connection. (3) Connect

11、ing 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 Stereo amplifier or any of its assemblies. 3. Unless specified

12、 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 service data, lubrication of contacts is not required. 4. Do not d

13、efeat 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 heat sinks are correctly installed. 6. Always connect test inst

14、rument 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 the power on. Connect an insulation resistance meter (500V) t

15、o 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 terminals, Earphone jacks, etc. Electrostatically Sensitive

16、 (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 some field effect transistors and semiconductor chip components

17、. 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 electrostatic charge on your body by touching a known earth ground. Alt

18、ernatively, 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 ES devices, place the assembly on a conductive surface such a

19、s 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 not classified a “anti-static” can generate electrical charge

20、s 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 you are ready to install it. (Most replacement ES devices are

21、 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 material to the chassis or circuit assembly into which the

22、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 the brushing together of your clothes fabric or the lifting

23、of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.) ? RadioFans.CN 收音机爱 好者资料库 OVERALL SPECIFICATIONS Continuous output power into 8 ohms and 4 ohms 250 W (ref. rated THD, 20 Hz 20 kHz, both channels driven) Rated THD (250 mW to rated power, CCIF IMD

24、, DIM 100)0.005 % (ref. 20 Hz - 20 kHz) IHF dynamic power8 ohms : 355 W 4 ohms :640 W 2 ohms : 620 W Damping 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- weighted 120 dB (ref. rated p

25、ower) 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 minutes POWER CONSUMPTION Rated power640 W (120V 60Hz, 230V 50Hz) Standby power 0.5 W Idle power 40 W DIMENSION AND WEIGHT Unit dimensions (W x H x D) *435 x 103 x 379

26、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 MANUAL MAY BE SUBJECT TO

27、CHANGE WITHOUT PRIOR NOTICE. CHECK OUT WWW.NADELECTRONICS.COM FOR THE LATEST VERSION OF THE M22 SERVICE MANUAL. SPECIFICATIONS FRANAISESPAOLITALIANODEUTSCHNEDERLANDSSVENSKA 5 17 1/8 x 4 1/16 x 14 15/16 inches RadioFans.CN 收音机爱 好者资料库 6 RadioFans.CN 收音机爱 好者资料库 7 OP LME49720 CMR TL072 DC ser vo TL072 O

28、P LME49720 Hypex NC400 OEM Modul e Mi cr o cont r ol l er I I C/ SPI / GPI O PI C18F26K20 LED TOUCH TRI GGER I I C Anal og I nput unbal anced bal anced 100- 120VAC 220- 240VAC STB PSU 5V MAI N PSU +/ - VB +/ - VDR +/ - VAUX LDO AC ENABLE 3V3 Regul at ed suppl y LM317/ LM337 +/ - 17. 5V Regul at ed s

29、uppl y LM317/ LM337 +/ -1 4. 5V Cl i ppi ng cont r ol er OPA2134 Rel ay Cur r ent sensor TL084CN STB Audi o sense on/ of f 3.5mm CY8CMBR2044 Block diagram 7 RadioFans.CN 收音机爱 好者资料库 Instruction Decode and Control PORTA PORTB PORTC RA4/T0CKI/C1OUT RA5/AN4/SS/HLVDIN/C2OUT RB0/INT0/FLT0/AN12 RC0/T1OSO/T

30、13CKI RC1/T1OSI/CCP2(1) RC2/CCP1 RC3/SCK/SCL RC4/SDI/SDA RC5/SDO RC6/TX/CK RC7/RX/DT RA3/AN3/VREF+ RA2/AN2/VREF-/CVREF RA1/AN1 RA0/AN0 RB1/INT1/AN10 Data Latch Data Memory Address Latch Data Address 12 AccessBSR FSR0 FSR1 FSR2 inc/dec logic Address 4124 PCH PCL PCLATH 8 31-Level Stack Program Counte

31、r PRODLPRODH 8 x 8 Multiply 8 BITOP 88 ALU 20 8 8 Table Pointer inc/dec logic 21 8 Data Bus Table Latch 8 IR 12 3 ROM Latch RB2/INT2/AN8 RB3/AN9/CCP2(1) PCLATU PCU OSC2/CLKOUT(3)/RA6 Note1:CCP2 is multiplexed with RC1 when Configuration bit CCP2MX is set, or RB3 when CCP2MX is not set. 2:RE3 is only

32、 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 I/O. Refer to Section 2.0 “Oscillator Module (With Fail-Safe Clock Monitor)” for additional information. RB4/KBI0/AN11 RB5/KBI1

33、/PGM RB6/KBI2/PGC RB7/KBI3/PGD EUSARTComparator MSSP 10-bit ADC Timer2Timer1Timer3Timer0 CCP2 HLVD ECCP1 BORData EEPROM W Instruction Bus STKPTR Bank 8 State machine control signals Decode 8 8 Power-up Timer Oscillator Start-up Timer Power-on Reset Watchdog Timer OSC1(3) OSC2(3) VDD, Brown-out Reset

34、 Internal Oscillator Fail-Safe Clock Monitor Precision Reference Band Gap VSS MCLR(2) Block LFINTOSC Oscillator 16 MHz Oscillator Single-Supply Programming In-Circuit Debugger T1OSO OSC1/CLKIN(3)/RA7 T1OSI PORTE MCLR/VPP/RE3(2) FVR FVR FVR CVREF Address Latch Program Memory (8/16/32/64Kbytes) Data L

35、atch PIC18F26K20 MCU BOARD 8 RadioFans.CN 收音机爱 好者资料库 CLOCK OSCILLATOR 5.85 V 4.9 V SOURCE (S) S R Q DCMAX BYPASS/ MULTI-FUNCTION (BP/M) + - VILIMIT FAULT PRESENT CURRENT LIMIT COMPARATOR ENABLE LEADING EDGE BLANKING THERMAL SHUTDOWN + - DRAIN (D) REGULATOR 5.85 V BYPASS PIN UNDER-VOLTAGE 1.0 V + VT

36、ENABLE/ UNDER- VOLTAGE (EN/UV) Q 115 A25 A LINE UNDER-VOLTAGE RESET AUTO- RESTART COUNTER JITTER 1.0 V 6.4 V BYPASS CAPACITOR SELECT AND CURRENT LIMIT STATE MACHINE OVP LATCH SMPS STB BOARD TNY274 9 RadioFans.CN 收音机爱 好者资料库 YES Check STB board Check LED board 5V RIGHT? check IC301 circuitNONO Logo Am

37、ber LED on? No Power or Power shuts off immediately 5VL RIGHT? NO Check L104 C175 C176 YES Check Q110 Q111 Q114 Q115 Q116 circuit Change LED board YES NO B Touch Power key Logo led turn white? YES change STB board Check PWM signal YES Logo led turn off? Logo led turn red? YES NO YES Check PSU board

38、+/-VB +/-VAUX +/-VDR RIGHT? NO Check STB board STB 3V RIGHT? YES Change PSU Board Check U1 U5 PWM circuit NO Check STB Board:Q301 K301 circuit Check MCU board:Q131 circuit YES Check MCU Board VPP VPI +/-17.5V +/-VDR RIGHT? Check MCU Board NO Change MCU Board Check Q123 Q124 circuit YES Check U104, C

39、hange MCU board Check LED control signal TROUBLESHOOTING A GUIDE 10 RadioFans.CN 收音机爱 好者资料库 B F i n i sh Rear panel led show green? YES NO led turn off?Rear panel led show red? NO YES Check D500 U505 circuit, YES Check Q500 Q502 Q508 circuit Change NC400 OEM BOARD Apply 1khz sinewave to DUT Amplifie

40、r output correct? YES NO INC INH signal correct? YES Change NC400 OEM BOARD check+/-14.5V,5V Right? NO checkQ505 Q506 Circuit NO change AMP board YES checkU500 U501 U502 U503 Circuit change AMP board checkQ503 Q504 Circuit TROUBLESHOOTING B GUIDE 11 RadioFans.CN 收音机爱 好者资料库 1.MCU VM1.0 12 XM100 HOLE

41、C162 22N R282 100R GND XM101 HOLE C16322N R283 100R GND 3V3S C138 22u/ 6v3 C139 100N GND MCLR/VPP/RE3 1 RA0/AN0/C12IN0- 2 RA1/AN1/C12IN1- 3 RA2 4 RA3 5 RA4 6 RA5/HLVDIN 7 VS S 8 OS C1/CLKIN/RA7 9 OS C2/CLKOUT/RA6 10 RC0 11 RC1 12 RC2 13 RC3/SCK/S CL 14 RC4/SDI/S DA 15 RC5/SDO 16 RC6/TX/CK 17 RC7/RX/

42、DT 18 VS S 19 VDD 20 RB0/INT0/FLT0/AN12 21 RB1/INT1 22 RB2/INT2 23 RB3/AN9 24 RB4/KBI0 25 RB5/KBI1/PGM 26 RB6/KBI2/PGC 27 RB7/KBI3/PGD 28 U105 PIC18F26K20 GND C137 NC R216 22k R208 10k R210 180k GND VHP1 C133 100N D119 3V6 3V3S GND GND R220 100R PG DATA PG CLK MCLR RXD TXD GND 3V3S 1 2 3 4 P109 Head

43、er 4 R268 100R R269 100R C152 100n L103 FB GND C147 100N GND RXD TXD MCLR 3V3S GND PGCLK PGDATA 1 2 3 4 5 CON103 ICSP R222 100R R219 100R R225 100R R228 100R R231 100R R235 100R 12 34 56 78 910 1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536 P100TO AMP board A VPPi VPNi SCL S DAR126

44、 0R R123 0R R128 0R R130 0R GPOa0 R133 0R GND VDR- VDR+ +17.5V -17.5V R131 0R R135 0R AudioS 5V S VCLIP0 b ec Q105 DTC114EKA D124 ss12 G 1 OUT 2 IN 3 O 4 U108 ASM1117-3.3 C155 100n C158 100n 5VS 3V3S C151 22u/6V3 3V3S GND L102 742792662 C159 10n GND R121 0RGND C101 10N C102 10N GNDGND R119 0R R120 0

45、R 12 34 56 78 910 1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536 P101TO AMP board A VPPi VPNi S CL S DAR169 0R R168 0R R170 0R R172 0R GPOa1 R177 0R GPOb1 GND VDR- VDR+ +17.5V -17.5V R174 0R GPI1 R178 0R AudioS 5VS VCLIP1 R165 3K9GND C108 10N C109 10N GNDGND R158 0R R161 0R D112 4V

46、7 D113 4V7 GNDGND D114 4V7 GND D105 4V7 D106 4V7 GNDGND D107 4V7 GND 1 2 3 4 5 6 P105 From PS U VDR- VDR+ VPP VPNi GND GND PS _EN VAUX+ VAUX- nFATAL OVL nAMPON AMPOFF OVL nAM PON 1 2 3 4 8 7 6 5 FB100 100M/600R R229 100R R232 100R R233 100R R223 100R STBY Q131 DTA114 R186 100 3V3S C124 100N C129 100

47、N C122 100N C132 100N R240 0R R244 0R S DA S CL R201 1k R202 0R GND VAUXa C125 100N D118 3V6 GND R185 10K VAUXa 3V3S GND R139 10 0R C107 2N2 R141 100R R14 4 2.5mR R173 22K R179 22K D110 15V R18 0 7K5 GND C115 10n R164 47K C114 1U 2 3 1 U102A TL084 6 5 7 U102B TL084 C112 470N R152 330K R153 330K GND

48、R151 10K R167 10K GND Q117 2SA1312 13 12 14 U102C TL084 R163 12K R17 6 1K GND R136 200R R137 200R VCLIP0 VCLIP1 9 10 8 U102D TL084 VPPi VPNi VPNi VPP GND GND 411 U102E TL084 -17.5V +17.5V C116 2N2 C117 2N2 GND 2 3 1 U100A LM324 6 5 7 U100B LM324 13 12 14 U100C LM3249 10 8 U100D LM324 R101 47K R100 1

49、K R112 5K6 R113 5K6 Q104 2SA1312 5VA R122 5K1 GND R111 100K R11 5 15 K R12 5 15 K R129 100KGND 5VS R114 10R C103 10U GND 5VA R116 100K R12 7 10 0K C105 10U GND 5VA R11 7 10 0K GND AudioS 5VA 411 U100E LM324 GND 1 1 2 2 C104 100N R124 100R Audi oSa D123 4V7 C143 100N GND POWER_ON A-LED R245 100R AUDIO SENS E CLIPPING CONTROL R203 180kVHP1 D EBU G TRI GIN R285 47KJ TRI GON_OFF a1 1 gnd 2 a2 3 y2 4 vcc 5 y1 6 U109