NAD-C720BEE-rec-sm1维修电路原理图.pdf

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1、NAD SERVICE MANUAL C 720BEE STEREO RECEIVER C 720BEE STEREO RECEIVER RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION.3 REAR PANEL/FRONT PANEL VIEW.4 SPECIFICATIONS.5-7 ALIGNMENT PROCEDURE.6-7 WIRING DIAGRAM8 BLOCK DIAGRAM. .9-15 ALIGNMENT PROCEDURE.16 SCHEMATICS.17-20 P

2、CB LAYOUT 21-24 SPECIAL FUNCTION/TROUBLE SHOOTING GUIDE.25 ELECTRICAL PARTS LIST.26-34 EXPLODED VIEW.35 EXPLODED VIEW PARTS LIST.36 - 2 - PROTECT IC CHANGE .37 RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONS CAUTION:Before servicing the Stereo Receiver covered by this service data and its supplements

3、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 Servicing Precautions 1. Alwa

4、ys unplug the Stereo Receiver 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) Connecting a test substitute in pa

5、rallel 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 Receiver or any of its assemblies. 3. Unless specified otherwise in this service d

6、ata, 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 defeat any plug/socket B+ vol

7、tage interlocks with which instruments covered by this service manual might be equipped. 5. Do not apply AC power to this Stereo Receiver 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 app

8、ropriate 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) to the blades of the attachmen

9、t 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 (ES) Devices Some semiconduc

10、tor (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. The following techniques sh

11、ould 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. Alternatively, obtain and wear a

12、 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 as aluminum foil, to prevent e

13、lectrostatic 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 charges sufficient to damage ES dev

14、ices. 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 packaged with leads electric

15、ally 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 device will be installed. Cau

16、tion: 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 of your foot from a carpeted

17、floor can generate static electricity sufficient to damage an ES device.) - 3 - 1 50Hz, 80kHz LPF) THD (ZONE 2 OUT) (2V CD IN, 1kHz, 80kHz LPF)?0.03% Frequency Response(SUB OUT) 50Hz)?3dB at 100Hz Outputs Preamp output impedance80? Zone2 output impedanceSource Z+ 600? Controls Treble5dB at 10kHz Bas

18、s8dB at 100Hz Pre-in ,Power AMP out,input 2V Signal-to-Noise ratio, A-weighted98dB ref 1 W out (500mV CD in, SPK out, 8?, A weighted) Rated distortion (THD)(20Hz 20kHz)?0.03% Input sensitivity225mV (CD in, SPK out, at rated power, volume max.) Channel Separation?70dB (CD in, 20W out at 8?, 1k? short

19、ed, 1kHz) Frequency responsetone defeat+/-0.1dB tone on+/-0.5dB Usual sensitivityMono, -30dB THD+N?12dBuV Mono, 50 dB S/N?25dBuV Tuner FM Section(At 75kHz deviation for AH ; 40kHz for C) - 6 - Capture ratio (at 45 and 65 dBf)?3 dB AM rejection (at 65 and 85dBf)?40 dB Alternative channels Selectivity

20、?40 dB (RF400KHz, at 30dB) Image rejection(at usable sensitivity)?70 dB I.F. rejection (at usable sensitivity)?70 dB Pilot suppression (1kHz, 60dBu)?55 dB THDMono, 1kHz, 60dBu?0.8% Stereo, 1kHz, 60dBu?1% Signal-to-noise ratio (Mono, 60dBu) ?60 dB Frequency response(50Hz -15kHz)3dB Stereo separation

21、(1kHz; 60dBu)?35 dB Usable sensitivity (at S/N=20dB)?60 dB? THD (74dBu input , 30% mod )?3% 1 signal Selectivity(at usable sen.)?20 dB Image rejection(at usable sen.)?28 dB I.F. rejection (at usable sen.)?40 dB S/N ratio(30% mod, 80dBu input)?40 dB Physical Specifications Width Height Depth435x133x3

22、50mm Net Weight8.7kg Shipping Weight10.3kg Power Consumption110W (50/60 Hz, at 110 or120VAC for AH, 230 or 240VAC for C) Tuner AM Section(30% mod) - 7 - PCB-10 HEADPHONE BOARD PCB-2 POWER BOARD UL2468 AWG#26, WHITE, 150mm PCB-6 AC OUTPUT BOARD CZ45 TRANSFORMER UL3266 AWG#18 190mm UL1007 AWG#22 150mm

23、 270mm UL1672 AWG#22 CZ703 CZ702 PCB-4 VFD BOARD PCB-7 OUT MODULE BOARD CZ703 (Insert) CB62 CZ701 PCB-5 POT BOARD 10 1 UL2468 AWG#26 WHITE, 130mm CB31 PCB-3 KEY BOARD FPC 1.25-19P-710mm 18 9 WHITE CB33 CZ34 (Insert) UL2468 AWG#26 WHITE, 400mm PCB-8 IN MODULE BOARD CB61 UL1672 AWG#18 UL1672 AWG#22, 1

24、50mm CB49 CB47 CB45 RED, 100mm PCB-9 MUTE BOARD CB34 CB34 CB32 (Insert) (Insert) WIRING DIAGRAM CB59 PCB-1 MAIN BOARD FPC 1.25-17P-180mm TUNER MODULE (KST-MB114MA0/1-23) CZ35 WHITE, 500mm UL2468 AWG#26 CON 01 CZ36 CZ37 WHITE WB01HS-001(C) UL1672 AWG#18 CB58 CB54 CB52CB51 CB55 CB53 RED, 130mmWB05HS-0

25、01(AH) CB56 CB57 AC POWER PLUG POWER SWITCH TUNER R FROM TUNER MODULE INPUT SELECTION CIRCUIT (BY RELAY) DISC L DISC R CD R VIDEO R AUX R TAPE R TAPE L AUX L VIDEO L CD L IC 33 CD4094 IC31 NJU7313AL CPU CPU ZONE 2 L ZONE 2 R PREAPM MODULE AMP CIRCUIT IN? PREAMP MODULE AMP CIRCUIT OUT? BASS RT31 RT32

26、 RT34 TREBLE BALANCE SW31 TONE DEFEAT RT33 VOLUME MUTE MUTE MUTE Q310 Q31 Q32 SUB OUT CONTROL SUB OUT PRE-OUT L PRE-OUT R MAIN IN R MAIN IN L SOFT CLIPPING CONTROL CIRCUIT S41 POWER AMP CIRCUIT L CIRCUIT R POWER AMP IC 33 CD4094 PROTECTION CIRCUIT (IC44,UPC1237HA) SPK B SPK A 4 5 7 Q416 Q417 C1815 C

27、1815 SPKA R SPKB LSPKA L SPKB R RL12/1 JQX-115F /0242HS4AF RL12/2 JQX-115F/0242HS4AF CPU ISC CIRCUIT (IC43,TL082D) TRIGI-V MIRROR SOURCE SCR CIRCUIT 2 3 4 5 7 8 21 22 24 25 26 27 (13,15,16) (1,2,3) (4,5,6,7,13,14) 11 12 VOL- VOL+ VOLUME CONTROL CIRCUIT (REMOTE) MUTE CIRUIT STANDBY (CPU) JK41 AMBER L

28、ED CONTROL CIRCUIT R467 POSISTOR (80 DEGREE C) R439 POSISTOR (90 DEGREE C) BLOCK DIAGRAM HEADPHONE FROM TUNER MODULE TUNER RTUNER L CIRCUIT CONTROL CURRENT CIRCUIT CONTROL CONTROL - 9 - 2 3 1 IC702 IS1U60L +5V +5V +5V DATA CLK ST DOUT DIN CLK STB IR OUT IR IN PSEN 29 ALE/P 30 TXD 11 RXD 10 P27 28 P2

29、6 27 P25 26 P24 25 P23 24 P22 23 P21 22 P20 21 P00 39 P01 38 P02 37 P03 36 P04 35 P05 34 P06 33 P07 32 WR 16 RD 17 RESET 9 X2 18 X1 19 EA/VP 31 T0 14 T1 15 INT0 12 P10 1 P11 2 P12 3 P13 4 P14 5 P15 6 P16 7 P17 8 INT1 13 VCC 40 GND 20 IC704 AT89C55WD RDS CLK 13 2 IC708 TCM810MEND 5 6 IC705 11.0592MHz

30、 IR OUT CIRCUIT IR IN CIRCUIT IC31 NJU7313AL ST DATA CLK IC703 UPD16311 +5V-30V CLK 9 5 6 8 STB DIN DOUT ENCODER CONTROL CIRCUIT 10k 2k 470 Q712 +5V Sandby control line 24C64 18V Power Supply Circuit STR D CLK IC707 4094 STR D CLK IC32 4094 STR D CLK IC33 4094 1 2 3 1 2 3 1 2 3 DATA CLK ST2 ST ST2 S

31、T ST CLK CLK CLK DATA DATA 10K10K10K10K10K10K10K10K +5V RDS DATA PLL CE PLL D0 PLL D1 PLL CLK1 TUNER STEREO 1 2 3 4 5 6 7 8 9 KST-MB114MA0/1 TUNER MODULE RDS CLK RDS DATA PLL CE PLL D0 PLL D1 PLL CLK1 TUNER STEREO 22pF 4.7pF MICROPROCESSOR CONNECTION DIAGRAM Vdd Vdd Vee 14 33 34 +5V FLASH Power Supl

32、ly Display circuit DATA 9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 uPC1237HA MAIN BOARD: IC44 Overload Detector Output Offset Detector Switch for latch/automatic -reset Flip-Flop VCC ON MUTE AC-OFF detector Relay driver 1 2 345 78 6 GND VCC AT24C64A KEY BOARD: IC705

33、 PIN CONFIGURATION 1 2 3 45 6 7 8VCC WP SCL SDAGND A0 A1 A2 PIN NAME A0-A2 SDA SCL WP ADDRESS INPUTS FUNCTION SERIALDATA SERIAL CLOCK INPUT WRITE PROTECT WP Vcc GND SCL SDA A0 A1 A2 START STOP LOGIC LOAD SERIAL CONTROL LOGIC EN H.V. PUMP/TIMING DATA RECOVERY X DEC EEPROM SERIAL MUX Dout/ACK LOGIC Do

34、ut Din Y DEC DATA WORD ADRR/COUNTER INC LOAD COMP R/W DEVICE ADRRESS COMPARATOR ICS BLOCK DIAGRAM - 11 - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40Vcc P0.0(AD0) P0.1(AD1) P0.2(AD2) P0.3(AD3) P0.4(AD4) P0.5(AD5) P0.6(AD6) P0.7(AD7) P

35、2.0(A8) P2.1(A9) P2.2(A10) P2.3(A11) P2.4(A12) P2.5(A13) P2.6(A14) P2.7(A15) PSEN ALE/PROG EA/VPP (T2)P1.0 (T2EX)P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST (RXD)P3.0 (TXD)P3.1 (INT0)P3.2 (INT1)P3.3 (T1)P3.5 (T0)P3.4 (WR)P3.6 (RD)P3.7 XTAL1 XTAL2 GND AT89C55WD KEY BOARD : IC704 PIN CONFIGURATION OSC WATC

36、H DOG PORT 1 LATCHLATCH LATCHLATCH PORT 0 PORT 2 PORT 0 DRIVERS PORT 1 DRIVERS PORT 2 DRIVERS PORT 3 DRIVERS QUICK FLASH RAM RAM ADDR. REGISTER REGISTER B ACC STACK PIONTER PROGRAM ADDRESS REGISTER BUFFER PC INCREMENTER PROGRAM COUNTER DUAL DPTR INTERRUPT,SERIAL PORT AND TIMER BLOCKS TMP2 TMP1 ALU P

37、SW TIMING AND CONTROL INSTRUCTION REGISTER P1.0 - P1.7P3.0 - P3.7 P2.0 - P2.7P1.0 - P1.7 - 12 - CD4094 MAIN BOARD:IC32 to a familiar name, and it can be stored with the MEMORY key. DEFECTIVE LIGHT? NORMAL? YES YES - 25 - CIRCUIT NO.PART NO.DESCRIPTION ICS IC3, IC4, IC34, IC4303-00082-00TL082CP/D IC4

38、403-01237-00UPC1237HA IC32, IC33 03-04094-00CD4094/HEF4094 IC3103-07313-00NJU7313AL DIODES D13, D14, D15, D16, D17, D23, D24, D25, D26, D27, D37, D38, D39, D310, D311, D312, D315, D42, D43, D403, D412, D413, D417, D418, D423, D428 33-44148-021N4148 D419, D42033-44148-031N4148 D11, D12, D21, D2233-14

39、709-014.7V 0.5W D313, D31433-11600-0116V 0.5W D4933-11800-0118V 0.5W D410, D41133-12000-0220V 0.5W TRANSISTORS QI2, Q12/1, Q16, Q26, Q44, Q45, Q47, Q401, Q403, Q411 31-01015-002SA1015 GR QI1, Q11, Q17, Q21, Q27, Q33, Q34, Q35, Q36, Q37, Q38, Q39, Q43, Q46, Q48, Q402, Q404, Q412, Q414, Q416, Q417, Q4

40、21 31-01815-002SC1815 GR Q12, Q15, Q22, Q25, Q102, Q104, Q202, Q204 31-00970-002SA970 GR Q13, Q14, Q23, Q24, Q101, Q103, Q201, Q203 31-02240-002SC2240 GR Q18, Q2831-00647-002SB647A Q19, Q2931-00667-002SD667A Q110, Q113, Q210, Q213, Q42 31-01220-00KSA1220 Q111, Q112, Q211, Q212, Q116, Q216, Q41, Q413

41、 31-02690-00KSC2690 Q31031-00363-002SK363 CAPACITORS C18, C19, C28, C29, C45, C46 05-22012-0022p/100V 10% C36005-10112-01100p/100V 10% C302, C303, C36105-22112-01220p/100V 10% C12, C22, C335, C336, C112, C113, C212, C213 05-47112-00470p/100V 10% C438, C439, C440, C44205-51112-00510p/100V 10% C31, C3

42、2, C33, C34, C35, C36, C37, C38, C39, C310 24-10161-01100p/63V, 10% C311, C31224-12261-001n2/63V, 10% C3, C357, C358, C41, C443, C444 24-10461-000.1u/63V 20% C43224-22461-000.22u/63V 20% C35024-82161-00820p/63V 10% C349, C435, C43624-10261-001n/63V 10% C351, C352, C353, C354, C355, C356, C362 24-103

43、61-0310n/63V 10% ELECTRIAL PARTS LIST PCB-1: MAIN BOARD - 26 - CIRCUIT NO.PART NO.DESCRIPTION ELECTRIAL PARTS LIST C120, C220, C43424-22312-0422n/100V 10% C119, C219, C327, C32825-22361-0522n/63V 5% C118, C21825-10461-040.1u/63V 5% C17, C114, C115, C117, C27, C214, C215, C217, C319, C320, C321, C322

44、, C337, C338, C345, C346, C411, C412, 25-10412-020.1u/100V 10% C329, C330, C34725-10461-070.1u/63V 5% C331, C332, C34825-22461-020.22u/63V 5% C333, C33425-95461-000.95u/63V 5% C121, C122, C221, C22225-10561-021u/63V 5% C339, C34006-10951-081u/50V 20% C417, C418, C42106-47951-004u7/50V 20% C13, C14,

45、C23, C24, C48, C415, C416, C425, C426, C428, C429, C430, C431, C301 06-10051-0010u/50V 20% C11, C2106-10051-0810u/50V 20% C12/1, C47, C49, C110, C111, C210, C211, C323, C324, C410 06-47021-0047u/25V 20% C325, C326, C341, C34206-47021-0647u/25V 20% C103, C104, C203, C204, C420 06-10111-00100u/16V 20%

46、 C15, C16, C25, C2606-22161-00220u/63V 20% C43, C4406-22151-00220u/50V 20% C413, C41406-22131-00220u/35V 20% C42206-33111-01330u/16V 20% C116, C21606-22260-012200u/6.3V 20% RESISTORS R385, R38607-10189-001.8? 5% 1/6w R154, R155, R254, R25507-10100-1010? 5% 1/4w R207-10100-0010? 5% 1/6w RI307-10330-0

47、033? 5% 1/6w R115, R116, R215, R21607-10330-1033? 5% 1/4w R14, R24, R416, R417, R418, R419 07-10101-10100? 5% 1/4w R363, RI607-10101-00100? 5% 1/6w R138, R23807-10391-10390? 5% 1/4w R11, R139, R21, R239, R31, R310, R311, R312, R32, R33, R34, R35, R36, R37, R38 R39 07-10471-10470? 5% 1/4w R454, R4550

48、7-10511-10510? 5% 1/4w R41, R42, R43, R44, R47, R48, R49, R410, R411, R413, 07-10681-10680? 5% 1/4w R147, R247, R403, R405, R406, R407, R474, R476 07-10102-101K? 5% 1/4w RI207-10102-001K? 5% 1/6w R422, R42307-10112-101.1K? 5% 1/4w R424, R42507-10132-101.3K? 5% 1/4w R367, R368, R41207-10202-102K? 5%

49、1/4w R158, R258, R414, R428, R440 07-10222-102.2K? 5% 1/4w RI4, R369, R370, R371, R372, R373, R374, R375, R376, R377, R378, R379, R380 07-10472-004.7K? 5% 1/6w R401, R48207-10472-104.7K? 5% 1/4w - 27 - CIRCUIT NO.PART NO.DESCRIPTION ELECTRIAL PARTS LIST R42907-10512-105.1K? 5% 1/4w R38107-10512-005.1K? 5% 1/6w R48007-10622-106.2K? 5% 1/4w R12/107-10682-106.8K? 5% 1/4w R402, R469, R470, R471, R404 07-10103-1010K? 5% 1/4w R364, R365, R366, R449, R450, R493, R49