NAD-C730-rec-sm维修电路原理图.pdf

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1、NAD SERVICE MANUAL C 730 STEREO RECEIVER C 730 STEREO RECEIVER RadioFans.CN 收音机爱 好者资料库 2 SERVICE SAFETY PRECAUTIONS 1.Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference NoPart NumberDescription M151 *AH 5120-0037-0FU T3.15A 2

2、50V UL/CSA 5X20MM M152 *C 5100-2530-1BT2.5A/250V IEC M154 *AH 5120-0052-0FUSE T1.6A 250V 5X20MM UL/CSA NOTE: : USA, CANADIAN MODEL ONLY. : EUROPEAN MODEL ONLY. 2.Safety check out (Only U.S.A. model) Before returning the product to the customer, make leakage current or resistance measurements to dete

3、rmine that exposed parts are acceptably insulated from the supply circuit. Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer. CONTENTS DESCRIPTIONPAGE SPECIFICATIONS . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5、. . . . . . . . . . . . . .6 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 ADJUST

6、MENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11 IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、 . . . . . . . . . .12-14 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-19 IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-23 ELECTRICAL PARTS LIST

9、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-33 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . .

10、 . . . . . . . . . . . . . . . . . . . . . . . . .35-36 PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 RadioFans.CN 收音机爱 好者资料库 3 SPECIFICATIONS POWER AMPLIFIER SECTION 1.Rated Distortion (THD 20Hz-20KHz, 30W, 8 ohm)0.

11、08% (THD 1KHz, 30W, 4 ohm)0.1% 2.Input Sensitivity (ref. 30W 8 ohm, 1KHz)350+/-30mV 3.S/N Ratio (A-wtd, 1K ohm, 500mV CD in, 1KHz)-85dB 4.Frequency Response (500mV CD in, 1W, 20Hz-20KHz)00.8dB 5.Channel Balance Volume maximal output 30W (ref), 1KHz1dB 1dB to -40dB, 1KHz2dB -41dB to -50dB, 1KHz3dB 6.

12、Audio Muting at 1KHz-52dB 7.Headphone Output in 0.1% (600 ohm load, 500mV CD in, 1KHz)10V 8.Crosstalk (2V input, 10W, 1KHz)-63dB PRE - AMPLIFIER SECTION 1.Rated Distortion (THD, 2V CD input, 4V output, 1KHz)0.08% 2.Frequency Response (500mV CD in, 20Hz-20KHz)00.08dB 3.S/N Ratio (A-wtd, 500mV CD in,

13、1KHz)-85dB 4.Tone Control Response Bass (500mV in,1W out ,100Hz) boost / cut92dB Treble (500mV in,1W out ,10KHz) boost / cut92dB AM TUNER SECTION Frequency Range:AH530 - 1710 KHzStep10 KHz C531 - 1602 KHzStep9 KHz Input level is expressed as the reading in open-circuit of 75-ohm source impedance sig

14、nal generator. 1.Usable Sensitivity (999/1000KHz)30dBV 2.S/N Ratio (5mV input)38dB 3.THD (5mV input)3% 4.IF Rejection (450KHz)36dB 5.Image Rejection (F+2xIF)28dB 6.Selectivity17dB 7.Output130mV26mV 8.Loop Sensitivity (20dB S/N)999/1000KHz66dB 603/600KHz66dB 1404/1400KHz66dB 9.Frequency Response (100

15、-2.3KHz, 5mV)06dB RadioFans.CN 收音机爱 好者资料库 4 FM TUNER SECTION Frequency Range:AH87.5 - 108 MHzStep50 KHz C87.5 - 108 MHzStep50 KHz Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator. *C*AH 1.Usable Sensitivity (Mono, 98MHz)15dB15dB 2.S/N Ratio (60dB, I

16、HF wtd)Mono72dB72dB Stereo66dB66dB 3.THD (60dB, L=R, 75KHz Dev. for AH, 40KHz Dev. for C) Mono0.3%0.3% Stereo0.35%0.35% 4.IF Rejection (10.7MHz)78dB65dB 5.Image Rejection (119.4MHz)85dB85dB 6.Capture Ratio (40dB)3dB3dB 7.AM Suppression (60dB, 100%mod FM, 30%mod AM)48dB48dB 8.Pilot Suppression (60dB)

17、60dB60dB 9.Frequency Response (60dB, 20Hz - 15KHz in, 75S for AH, 50S for C and01.5dB01.5dB Japan) 10. Channel Separation (60dB, IHF wtd)100Hz30dB30dB 1KHz38dB38dB 10KHz30dB30dB 11. Alternate Channel Selectivity (400KHz, IHF)60dB45dB 12. Muting Level183dB183dB 13. Output750mV150mV500mV100mV 14. Blen

18、d on Separation (60dB IHF wtd)62dB62dB 15. RDS Decode Sensitivity26dB26dB 16. Auto-search SensitivityOFF15dB15dB ON24dB24dB PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth)435 x 109 x 305 mm Net weight7.2 kg (15.87 lbs) Shipping weight9.2 kg (20.5 lbs) RadioFans.CN 收音机爱 好者资料库 5 REAR PANEL

19、 / FRONT PANEL REAR PANEL FRONT PANEL 1. POWER ON / OFF 2. STAND-BY INDICATOR 3. BLEND 4. MEMORY 5. FM MUTE / MODE 6. AM / FM 7. DISPLAY 8. PRESET / TUNE 9. PRESET / TUNE AND 10. DISPLAY AREA 11. VOLUME 12. HEADPHONE SOCKET 13. INPUT SELECTORS 14. BASS & TREBLE 15. TONE DEFEAT 16. BALANCE 1. FM ANTE

20、NNA 2. AM ANTENNA 3. DISC INPUT 4. CD INPUT 5. VIDEO INPUT 6. AUX INPUT 7. TAPE 2 IN, OUT 8. TAPE 1 IN, OUT 9. PRE OUT 10. NAD-LINK IN, OUT 11. SOFT CLIPPING 12. 12V TRIGGER OUT 13. SPEAKERS 14. AC LINE CORD 15. SWITCHED AC OUTLET (AH version only) RadioFans.CN 收音机爱 好者资料库 6 DISASSEMBLY INSTRUCTIONS

21、1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels. Remove tapping screw 3.0 x 8.5 ( 5 ) from the back panel. Refer to Figure No.1. Figure No.1 2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35 and then remove in the direction as indicated by the arrow 7 .

22、 Refer to Figure No.2. Figure No.2. 5 4 3 1 2 7 6 6 RadioFans.CN 收音机爱 好者资料库 7 BLOCK DIAGRAM AM LOOP ANTFM ANT FRONT END ENV172D3G1 VFD Protect LR CPU KEY MATRIX Trigger Out REMOTE SENSOR CD DISC VIDEO AUX TAPE-1 OUT TAPE-2 OUT TC9273 TAPE-2 IN PRE OUT TAPE-1 IN (Mon) S11 1217 PLLLC72723M AM/FM IF LA

23、1837 TUNER DIODE MATRIX NAD LINK IN-OUT MAIN POWER SUPPLY SPEAKER OUT STAND BY POWER SUPPLY RELAY RELAY POWER AMP. +5V CPU AC INPUT AC INPUT VT VT cedataclkRDS-CLKRDS-SIGRDS-DATA data out (#1)=Power On (#2)=Protect (Flash 2Hz) (#1)+(#2)=Standby (#1) (#2) LC7218 Locking SW, Tone defeat ST/MO, MUTE, S

24、METER TUNE FM OSC/IF AM OSC/IF OUT AUDIO AUDIO IN IN S2 S3 S4 S5 S6 S7 S8 S9 S10 VOLUME MOTORIZE MUTE RadioFans.CN 收音机爱 好者资料库 8 WIRING DIAGRAM MAIN BOARD TRANSFORMER SECONDARY BOARD KEY BOARD PSU BOARD SPEAKER BOARD BLACK 6PIN BLACK 6PIN BLACK 35PIN BLACK BROWN BLUE 3PIN BLACK 3PIN BLACK RED AC INPU

25、T BLUE 3PIN BLACK 4PIN BLACK BLACK BLACK BLUE GREEN TUNER BOARD POWER SWITCH BOARD PHONE BOARD LED BOARD PRIMARY BOARD P32 P39 P40 P41 P42 P43 P44 P45 P46 P47 P48 P33P34P35P36 RadioFans.CN 收音机爱 好者资料库 OSCRF Testing Point TP2 Testing Point TP1 Testing Point TP3 Testing Point TP4 9 ADJUSTMENT POINTS DI

26、AGRAM 1. TUNER 2. MAIN BOARD RadioFans.CN 收音机爱 好者资料库 FM SIGNAL GENERATOR OUTPUT TERMINAL OUTPUT TERMINAL DISTORTION ANALYZER DISTORTION ANALYZER AC VOLTMETER OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE OUTPUT TERMINAL OUTPUT TERMINAL L R ANTENNA TERMINAL ANTENNA TERMINAL A

27、NTENNA TERMINAL AM LOOP ANTENNA (Accessory) AM LOOP ANTENNA 60cm DIGITAL MILLIVOLT METER VT J911, GND FM SIGNAL GENERATOR AM SIGNAL GENERATOR FM SIGNAL GENERATOR RDS GENERATOR FM STEREO GENERATOR P901 DC MILLIVOLT METER UNIT UNIT UNIT UNIT INSTRUMENT SETUP 1. FM MEASUREMENT Fig. 1 Fig. 2 2. RDS MEAS

28、UREMENT Fig. 3 3. AM MEASUREMENT Fig. 4 10 ALIGNMENT PROCEDURES AMPLIFIER SECTION StepItemConnectionAdjustmentAdjust for 1Left ChannelVoltmeter to TP1, TP2 on Amp BoardR8682mV0.2mV 2Right ChannelVoltmeter to TP3, TP4 on Amp BoardR8672mV0.2mV RadioFans.CN 收音机爱 好者资料库 11 FM/RDS SECTION INPUT - FM mono:

29、1kHz, 75kHz devi., 60dB/V - FM stereo:1kHz, 67.5kHz devi., 60dB/V Pilot signal 19kHz 7.5kHz devi. OUTPUTS - Connect the non-inductive type resistor of 8 ohms to all speaker terminals otherwise noted. Item FM IF/RF Stereo Distortion Stereo Separation Muting Level Signal output Step 1DC voltmeterL9410

30、100mV 3 Distortion analyzer Distortion analyzer Oscilloscope Oscilloscope L942 R956 R941 Minimum Minimum 2AC voltmeter IFT on the front end IFT on the front end Maximum Maximum separation Connection of instrument Fig.1 Fig.2 Fig.2 Fig.1 Channel L or R 1kHz 99.0MHz 1kHz 75kHz devi. 65dBf (60dB) 99.0M

31、Hz Ext. mod. 65dBf (60dB) FM SG output Stereo mod- ulator output Tuning frequency 99.0MHz 99.0MHz Channel L or R 1kHz 99.0MHz Ext. mod. 65dBf (60dB) 99.0MHz mod. 65dBf(60dB) RDS 2% MOD 99.0MHz 1KHz 75KHz devi 33dB 99.0MHz mod.65dBf(60dB) 99.0MHz 18dB 99.0MHz 99.0MHz Pilot Suppression Signal Strength

32、 Indicator RDS MIN 7 bars just lit VTVM VFD Signal Bars L903 FOR L L904 FOR R R991 Channel L or R pilot on signal Fig.2 Fig.1 Fig.3 99.0MHz 99.0MHz 99.0MHz Output indicator Adjustment point Adjust for Remarks FM MUTE/MODE switch: ON/AUTO Repeat the steps 1 to 3 until no fur- ther adjustment is neces

33、sary. FM MUTE/MODE switch: ON/AUTO Dont turn more than +/-180 Repeat stereo distortion and stereo separation alignment until THD at minimum and separation at maximum. Adjust such that output just unmute Decode the RDS- program station AM SECTION AM Modulation:400Hz, 30% For AH Version Step 1 2 3 530

34、kHz 600kHz 990kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block M971 RF coil on RF block M971 Adjust for 1.350.2V Maximum Maximum Step 1 2 3 522kHz or

35、531kHz 603kHz 999kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block M971 RF coil on RF block M971 Adjust for 1.30.2V (522kHz) 1.350.2V (531kHz) Maximum

36、Maximum For C Version IMPORTANT NOTES 1. Show the software version Press “PRESET/TUNE” and “TUNE UP”. 2. Light UP all the icon on the VFL Press “PRESET/TUNE” and “TUNE DOWN”. 3. CPU Resets Press “PRESET/TUNE” and “TUNE DOWN” and any one key. 4. AM Step 10K/9K Change Add or delete the AM step jumper

37、- J201 in the key PCB. RadioFans.CN 收音机爱 好者资料库 PCB LAYOUT KEY BOARD TOP VIEWBOTTOM VIEW PHONE BOARD LED BOARD SECONDARY BOARD PRIMARY BOARD 12 RadioFans.CN 收音机爱 好者资料库 13 MAIN BOARD RadioFans.CN 收音机爱 好者资料库 14 TUNER BOARDPSU BOARD POWER SWITCH BOARD SPEAKER BOARD RadioFans.CN 收音机爱 好者资料库 1615 MAIN BOAR

38、D SCHEMATIC DIAGRAM NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. RadioFans.CN 收音机爱 好者资料库 1718 TUNER BOARD NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% U

39、NLESS OTHERWISE SPECIFIED. RadioFans.CN 收音机爱 好者资料库 19 KEY BOARD S10 S11 S12 S13 S14 S01 S02 S03 S04 S05 S06 S26 S07 S08 S09 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S01 S03 S04 S05 S06 S07 S08 S09 S10 S11 S12 S13 S14 S15 S16 S18 S19 S20 S22 S23 S24 S33 AC4V8_1 AC4V8_2 AC4V8_2 AC4V8_1 S25 S25 AC4V8_1

40、AC4V8_2 S02 S21 S25 S33 +13V STANDBY RELAY S17 +5V +5V S26 S25 -VP +5V6 -VP N/A NAD N/A N/A TONE IN NAD IN RESET HEAD_P IN XT_2 VSS_1 6M_CF 6M_CF VDO_1 A/D 0 A/D 1 A/D 2 4.4V DETECT PROTECT IN RDS SIGNAL FA SMETER AM SMETER TRIGGER IN RDS CLK IN REMCON 10G 9G 8G 7G 6G 5G 4G 3G 2G 1G P18 P17 P16 P15

41、P14 P13 VDO -30V P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 N/A OPTION INPUT FM STEREO RDS DATA FM SD RSD SELECT AM STEP FM STEP MODEL TONE SPK RELAY MUTE TUNER MUTE STANDBY RELAY VOL. UP VOL. DN 11 LED 12 LED VSS_2 9273/7218 DATA OUT 7218 DATA 9273/7218 CLK 9273 STB EE_DATA OUT 7218 CE EE_CLK OUT 1 2 3

42、 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 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 1 2 3 1 2 3 1 2 3 4 17 OUT SELECT 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 6

43、3 64 65666768697071727374757677787980 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 25262728293031323334353637383940 OUT U201 LC866448 R258 22K R259 22K C208 47u/16V M216 BLEND M210 FM MUTE M207 FM/AM M201 TUNE M213 MEMORY M202 DISC M206 TUNE DN M203 DISPLAY M219A 6MHz CST6.00MGW R257

44、22K R232 10K D209 1N4148 D202 1N4004 R231 22K D204 1N4148 D205 1N4148 D206 1N4148 D207 1N4148 R25210K R25310K R25410K R255 10K R25610K R281 10K R28210K R283 10K R284 10K R285 22K R28622K C205 0.1u R230 22K R219 1K R218 1K J201A TO LED BD R201 820 R204 820 R207 1K8 R210 2K2 R213 4K7 M217 TAPE1_MON M2

45、15 TAPE2 M211 AUX M208 VIDEO M205 CD M214 TUNER R208 1K8 R211 2K2 R214 4K7 R216 6K8 R202 820 R205 820 R203 820 R291 10K R292 10K R293 10K C203 100u/6V3 C204 0.01u J206A 35PIN RDS CLK IN TRIGGER AM SMETER FM SMETER RDS SIGNAL PROTECT IN TONE IN 7218 CE 9273 STB 9273/7218 CLK 7218 DATA 9273/7218 DATA

46、OUT VOL DN VOL UP +13V TUNER MUTE MUTE SPK RELAY FM SD RDS DATA FM STEREO -30V 5V6 M220 DISPLAY R263100K R264100K R265100K R266100K R267100K R268100K R269100K R270100K R271100K R272100K R273100K R274100K R241100K R242100K R243100K R244100K R245100K R246100K R23310K R23410K R23510K R23610K R23710K R2

47、38 10K R23910K R24010K R24710K R24810KM218 PIC-12043TE2 REMOTE SENSOR L201 22uH D203 5V6 1/2WR220 470R R221 470R R222 470K D201 1N4148 C201 100u/6V3 C202 0.01u J104B AC POWER R215 820 M209 TUNE UP GREEN RED J101 TO POW D210 1N4148 C206 10U/16V R260 470R D211 5V1 GREEN=ON GREEN+RED=STDBY NAD IN NAD O

48、UT TONE OUT HEAD-PIN D_GND 5V1 R294 4.7K 1 2 3 4 5 6 7 8 U202 24C08 NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. RadioFans.CN 收音机爱 好者资料库 S37/PE5 P00 P01 P02 P03 P04 P05 P06 P07 VSS2 P10/SO0 P11/SI0/SB0 P12/SCK0 P

49、13/SO1 P14/SI1/SB1 P15/SCK1 P16/BUZ 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 S15/T15 S14/T14 S13/T13 S12/T12 S11/T11 S10/T10 S9/T9 S8/T8 S7/T7 S6/T6 S5/T5 S4/T4 S3/T4 S2/T2 S1/T1 S0/T1 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 S36/PE4 S35/PE3 S34/PE2 S33/PE1 S32/PE0 S31/PD7 S30/PD6 S29/PD5 S28/PD4 S27/PD3 S26/PD2 S25/PD1 S24/PD0 S23/PC7 S22/PC6 S21/PC5 S20/PC4 S19/PC3 S18/PC2 S17/PC1 S16/PC0 VP VDD2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 P17/PWM0 P30 P31 P32 P33 P70/INT0 RES XT1/P74 XT2/P75 VSS1 CF1 CF2 VDD1 P80/AN0 P81/AN1 P82/AN