NAD-M27-pwr-sm维修电路原理图.pdf

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1、NAD SERVICE MANUAL M27 SEVEN CHANEL M27 SEVEN CHANEL AMPLIFIER 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 .12-25 PCB LAYOUT.26-33 ELECTRICAL PARTS LIST. 95-43. . . EXPLODED VIEW. 60-63 EXPLODED VI

2、EW PARTS LIST.64 CIRCUIT DIAGRAMS TROUBLE SHOOTING A GUIDE.10 TROUBLE SHOOTING B GUIDE.11 RadioFans.CN 收音机爱 好者资料库 3 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 M

3、ETAL PART CAUTION : 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 WOR

4、K SHOULD BE PERFORMED 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

5、CHECKS AFTER THE ORIGINAL 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

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

7、EDING THIS LIMIT CONSTITUTES 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 C

8、ONSTITUTE 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. RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONS CAUTION:Before servicing the Stereo amplifier cover

9、ed 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 follow the safety precautions. Remember Safety

10、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 internal electrical plug or other electrical conne

11、ction. (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 Stereo amplifier or any of its assemblies. 3

12、. 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 service data, lubrication of contacts is not req

13、uired. 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 heat sinks are correctly installed. 6. Always

14、 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 the power on. Connect an insulation resista

15、nce 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 terminals, Earphone jacks, etc. Electrost

16、atically 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 some field effect transistors and semiconduct

17、or 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 electrostatic charge on your body by touching a known

18、 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 ES devices, place the assembly on a conduct

19、ive 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 not classified a “anti-static” can generate

20、 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 you are ready to install it. (Most replacem

21、ent 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 material to the chassis or circuit assemb

22、ly 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 the brushing together of your clothes fabr

23、ic or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.) 4 RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS FRANAISESPAOLITALIANODEUTSCHNEDERLANDSSVENSKA 5 * Gross dimensions include feet, buttons and rear panel terminals. * Non-metric measuremen

24、ts are approximate. NAD Electronics will not assume any liability for errors being made by retailers, custom installers, cabinet makers, or other end users based on information contained in this document. Note: Installers should allow a minimum clearance of 55mm for wire/cable management. M27 Contin

25、uous output power into 8 and 4 180W (ref. rated THD, 20Hz-20kHz, all channels driven) THD +N (250mW to rated power, CCIF IMD, DIM 100)0.005% (ref. 20Hz - 20kHz) IHF Dynamic Power 8 Ohms 4 Ohms 2 Ohms 320W 700W 650W Signal/Noise Ratio, A-weighted98dB (ref. 1W) 120dB (ref. rated power) Damping Factor7

26、50dB (ref. 8 , 50Hz and 1kHz) Frequency Response -2.5dB at 3Hz and 100kHz Input Impedance RCA XLR 47k C=100pF 220k C=100pF Input Sensitivity1.3V (ref. rated power) Time to Standby Mode at no input signal30 minutes Voltage Gain29dB GENERAL Rated Power1600W (120V 60Hz, 230V 50Hz) Standby Power0.5W Idl

27、e Power90W Unit Dimension (WxHxD) - Gross* 435 x 156 x 380mm 17 1/8 x 6 3/16 x 15 inches* Net weight14.1kg (31.1lb) Shipping weight20.4kg (45lb) 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 servo TL072 OP LME49720 Hypex NC400 OEM Module Micro controller IIC/SPI/GPIO P

28、IC18F26K20 LED TOUCH TRIGGER IIC Analog Input unbalanced balanced 100-120VAC 220-240VAC STB PSU 5V MAIN PSU +/-VB +/-VDR +/-VAUX LDO AC ENABLE 3V3 Regulated supply LM317/LM337 +/-17.5V Regulated supply LM317/LM337 +/-14.5V Clipping controler OPA2134 Relay Current sensor TL084CN STB Audio sense on/of

29、f 3.5mm CY8CMBR2044 CHANNEL 1/ 7 Block diagram RadioFans.CN 收音机爱 好者资料库 MCU BOARD PIC18F26K20 8 Instruction Decode and Control PORTA PORTB PORTC RA4/T0CKI/C1OUT RA5/AN4/SS/HLVDIN/C2OUT RB0/INT0/FLT0/AN12 RC0/T1OSO/T13CKI RC1/T1OSI/CCP2(1) RC2/CCP1 RC3/SCK/SCL RC4/SDI/SDA RC5/SDO RC6/TX/CK RC7/RX/DT R

30、A3/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 Counter PRODLPRODH 8 x 8 Multiply 8 BITOP 88 ALU 20 8 8 Table Pointer inc/dec logic 21 8 Dat

31、a 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 available when MCLR functionality is disabled. 3:OSC1/CLKIN and OSC2/CLKOUT are only

32、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/PGM RB6/KBI2/PGC RB7/KBI3/PGD EUSARTComparator MSSP 10-bit ADC Timer2Timer1Timer3Time

33、r0 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 Internal Oscillator Fail-Safe Clock Monitor Precision Reference Band Gap VSS MCLR(2)

34、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 Latch 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 BYPA

35、SS/ 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 ENABLE/ UNDER- VOLTAGE (EN/UV) Q 115 A25 A LINE UNDER-VOLTAGE RESET AUTO- RESTART COUNTER JITTER 1.0 V 6.4 V B

36、YPASS 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 TROUBLESHOOTING A GUIDE 10 YES Check STB board Check LED board 5V RIGHT? check IC301 circuitNONO Logo Amber LED on? No Power or Power shuts off immediately 5VL RIGHT? NO Check L104 C175 C

37、176 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 +/-VB +/-VAUX +/-VDR RIGHT? NO Check STB board STB 3V RIGHT? YES Change PSU Board C

38、heck U1 U5 PWM circuit NO Check STB Board:Q301 K301 circuit Check MCU board:Q131 circuit YES Check Regulated Supply Board VPP VPI +/-17.5V +/-VDR RIGHT? NO Check Regulated Supply Board Check Q123 Q124 circuit YES Check U104, Change MCU board Check LED control signal RadioFans.CN 收音机爱 好者资料库 TROUBLESH

39、OOTING B GUIDE 11 B Finish 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 Amplifier output correct? YES NO INC INH signal correct? YES Change NC400 OEM BOARD ch

40、eck+/-14.5V,5V Right? NO checkQ505 Q506 Circuit NO change AMP board YES checkU500 U501 U502 U503 Circuit change AMP board checkQ503 Q504 Circuit RadioFans.CN 收音机爱 好者资料库 1.MCU BOARD 12 CIRCUIT DIAGRAM XM100 HOLE C16222N R282100R GND XM101 HOLE C163 22N R283 100R GND 3V3S C138 22u/ 6v3 C139 100N GND M

41、CLR/VPP/RE3 1 RA0/AN0/C12IN0- 2 RA1/AN1/C12IN1- 3 RA2 4 RA3 5 RA4 6 RA5/HLVDIN 7 VSS 8 OSC1/CLKIN/RA7 9 OSC2/CLKOUT/RA6 10 RC0 11 RC1 12 RC2 13 RC3/SCK/SCL 14 RC4/SDI/SDA 15 RC5/SDO 16 RC6/TX/CK 17 RC7/RX/DT 18 VSS 19 VDD 20 RB0/INT0/FLT0/AN12 21 RB1/INT1 22 RB2/INT2 23 RB3/AN9 24 RB4/KBI0 25 RB5/KB

42、I1/PGM 26 RB6/KBI2/PGC 27 RB7/KBI3/PGD 28 U105 PIC18F26K20 GND C137 NC R216 22k R208 10k R210 33k GND VHP1 C133 100N D119 3V6 3V3S GND GND R238 100R R220 100R R197 100R PGDATA PGCLK MCLR RXD TXD GND 3V3S 1 2 3 4 P109 Header 4 R268 100R R269 100R C152 100n L103 FB GND C147 100N GND RXD TXD MCLR 3V3S

43、GND PGCLK PGDATA 1 2 3 4 5 CON103 ICSP R214 10K NMOSI q1 1 q2 2 q3 3 q4 4 q5 5 q6 6 q7 7 gnd 8 qh 9 /sclr 10 sck 11 rck 12 /g 13 ser 14 q0 15 vcc 16 U104 74HC595 GND C136 100N GND 3V3D 3V3D NCK0 R209B 100R R209D 100R R209C 100R R209A 100R R213B 100R R213C 100R R213D 100R R213A 100R 3V3S SH/LD 1 CLK

44、2 E 3 F 4 G 5 H 6 QH 7 GND 8 QH 9 SER 10 A 11 B 12 C 13 D 14 CLK INH 15 V CC 16 U103 HC165 R190A 10k GND 3V3D C120 100n GND 3V3D C121 100N 3V3DGND R190B 10k R190C 10k R190D 10k NCK1 GND R189A 10k R189B 10k R189C 10k R189D 10k q1 1 q2 2 q3 3 q4 4 q5 5 q6 6 q7 7 gnd 8 qh 9 /sclr 10 sck 11 rck 12 /g 13

45、 ser 14 q0 15 vcc 16 U106 74HC595 GND C141 100N GND 3V3D 3V3D R230B 100R R230D 100R R230C 100R R230A 100R R237B 100R R237C 100R R237D 100R R237A 100R NCS2 GND C140 100N NCS1 R226 100R R222 100R R219 100R R225 100R R228 100R R231 100R R235 100R NMOSI NMIS O NCK0 NCK1 NMIS O NCS2 NCS1 12 34 56 78 910

46、1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536 P100TO AMP board A VPPi VPNi SCL-a SDA-aR126 0R R123 0R R128 0R R130 0R GPOa0 R133 0R GND VDR- VDR+ +17.5V -17.5V R131 0R R135 0R AudioS 5VS VCLIP0 b ec Q105 DTC114EKA D124 ss12 G 1 OUT 2 IN 3 O 4 U108 ASM1117-3.3 C155 100n C158 100n 5

47、VS 3V3S C151 22u/ 6V3 3V3S GND L102 742792662 C159 10n R241 10k R239 10K Q135 DTC114EKA GND G D S Q132 APM2313 5VS5VD C146 1N GND GND 5VEN L101 742792662 G 1 OUT 2 IN 3 O 4 U107 ASM1117-3.3 C153100n C157 100n 3V3D C150 22u/ 6V3 3V3D GND C15422u/ 6V3 5VD GND R121 0RGND C101 10N C102 10N GNDGND R119 0

48、R R120 0R 12 34 56 78 910 1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536 P101TO AMP board A VPPi VPNi SCL-a SDA-aR169 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

49、0R 12 34 56 78 910 1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536 P102 TO AMP board A VPPi VPNi SCL-a SDA-aR193 0R R192 0R R194 0R R196 0R GPOa2 R199 0R GPOb2 GND VDR- VDR+ +17.5V -17.5V R198 0R GPI2 R200 0R AudioS 5VS VCLIP2 R188 10KGND C118 10N C119 10N GNDGND R184 0R R187 0R 12 34 56 78 910 1112 1314 1516 1718 19