NAD-C420-tun-sm 电路图 维修手册.pdf

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1、NAD SERVICE MANUAL C 420 STEREO AM/FM TUNER C 420 STEREO AM/FM TUNER RadioFans.CN 收音机爱 好者资料库 2 SERVICE SAFETY PRECAUTIONS 1.Safety check out (Only U.S.A. model) Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptabl

2、y 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . .3 REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 BLOCK D

4、IAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 ADJUSTMENT POINTS DIAGRAM . . . . . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . . .10 PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-16 IC BLOCK DI

7、AGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19 ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-25 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . .

8、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9、 . . . . . . . . . . . .28 RadioFans.CN 收音机爱 好者资料库 3 SPECIFICATIONS AM TUNER SECTION Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator Usable Sensitivity (999/1000kHz)30dB S/N Ratio (5mV in)38dB THD (5mV in)3% IF Rejection (450kHz)36dB Image Rejectio

10、n (F+2xIF)28dB Selectivity17dB Output130 +/-20mV Loop Sensitivity (20dB S/N) 999/1000 kHz66 dB 603/600 kHz66 dB 1404/1400 kHz66 dB Frequency response (100 - 2.3 kHz, 5mV)6 dB FM TUNER SECTION *C*AH Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator Us

11、able Sensitivity (98 MHz)13 dB13 dB Signal / Noise RatioMono72 dB72 dB (60 dB, IHF wtd)Stereo66 dB66 dB Frequency Response (20 Hz - 15 kHz, 60 dB)01.0 dB01.0 dB Channel Separation (60 dB)30 Hz33 dB33 dB 1 kHz42 dB42 dB 10 kHz32 dB32 dB Alternate Channel Sensitivity (40 dB, 400 kHz)60 dB45 dB Capture

12、 Ratio (40 dB)3 dB3 dB AM Suppression (60 dB, 100% Mod.FM, 30% Mod AM)65 dB65 dB Image Rejection (119.4 MHz)85 dB85 dB I.F. Rejection (10.7 MHz)78 dB78 dB Pilot Suppression (60 dB)60 dB60 dB THD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mono0.25%0.25% Stereo0.35%0.35% Auto-Search sensitivityOn24

13、dB24 dB Off15 dB15 dB RDS Decode Sensitivity26 dB26 dB PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth)435 x 80 x 285 mm Net weight4 kg (8.8 lbs) Shipping weight5.1 kg (11.22 lbs) RadioFans.CN 收音机爱 好者资料库 4 REAR PANEL / FRONT PANEL REAR PANEL FRONT PANEL 1. FM ANTENNA 2. AM ANTENNA 3. OUTP

14、UT 4. NAD-LINK IN/OUT 5. 12V TRIGGER IN 6. AC LINE CORD 1. POWER ON / OFF 2. STAND-BY LED 3. BLEND 4. MEMORY 5. FM MUTE / MODE 6. AM / FM 7. DISPLAY 8. PRESET / TUNE 9. DISPLAY AREA 10. PRESET / TUNE AND IMPORTANT NOTES 1. Show the software version Press “PRESET/TUNE” and “TUNE UP” (). 2. Light UP a

15、ll 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 D206: 10KHz / Delete D206: 9KHz. 5 4 3 1 2 7 6 6 DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side pa

16、nels. 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 . Refer to Figure No.2. Figure No.2. 5 6 BLOCK DIAGRAM AM LOOP ANTFM

17、ANTOUTPUT FRONT END ENV172D3G1 VFD CPU LC866448B U201 KEY MATRIX Trigger IN U202 EEPROM 24C08 PLLLC72723M RDS DECODER U901 AM/FM IF LA1837 MUTING DIODE MATRIX NAD LINK IN-OUT M218 REMOTE SENSOR POWER SUPPLY VFD -VP +5V CPU +10V AC INPUT L R VT VT cedataclkRDS-CLKRDS-SIGRDS-DATA MPXIN data out (#1)=P

18、ower On (#2)=Protect (Flash 2Hz) (#1)+(#2)=Standby (#1) (#2) LC7218 U903 ST/MO, MUTE, SMETER TUNE FM OSC/IF AM OSC/IF 1 27 17 16 23 2 30 U902 21 234515 23 19 58 6 IN 2 OUT 24 1614 79 16 14 22 78 71 72 5 757674 1918 7 WIRING DIAGRAM MAIN BOARD KEY BOARD LED BOARD TRANSFORMER YELLOW BLUE WHITE POWER S

19、UPPLY BOARD Trigger In Audio L,R Out 8 ADJUSTMENT POINTS DIAGRAM OSCRF VT Trigger In Audio L,R Out FM SIGNAL GENERATOR ANTENNA TERMINAL OUTPUT TERMINAL DISTORTION METER DISTORTION METER AC VOLTMETER OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE OUTPUT TERMINAL OUTPUT TERMINA

20、L L R ANTENNA TERMINAL ANTENNA TERMINAL ANTENNA TERMINAL AM LOOP ANTENNA (Accessory) AM LOOP ANTENNA 60cm DIGITAL MILLIVOLT- METER VT_J911 FM SIGNAL GENERATOR AM SIGNAL GENERATOR FM SIGNAL GENERATOR RDS GENERATOR FM STEREO GENERATOR P901 OUTPUT TERMINAL DC MILLIVOLT- METER UNIT UNIT UNIT UNIT 9 INST

21、RUMENT SETUP 1. FM MEASUREMENT Fig. 1 Fig. 2 2. RDS MEASUREMENT Fig. 3 3. AM MEASUREMENT Fig. 4 10 ALIGNMENT PROCEDURES FM/RDS SECTION - FM mono:1kHz, 75kHz devi., 60dB/V - FM stereo:1kHz, 67.5kHz devi., 60dB/V Pilot signal 19kHz 7.5kHz devi. OUTPUTS - Connect the 47Kohm resistor unless otherwise no

22、ted. Item FM IF/RF Stereo Distortion Stereo Separation Mute Level Signal output Step 1DC voltmeterL941070mV 3 Distortion analyzer Distortion analyzer Oscilloscope Oscilloscope L942 R941 R956 Minimum Minimum 2AC voltmeter IFT on the front end IFT on the front end Maximum Maximum separation Distortion

23、 Meter Minimum Connection of instrument Fig.1 Fig.2 Fig.2 Fig.1 Channel L or R 1kHz 99.0MHz 1kHz 75kHz devi. 65dBf (60dB) 99.0MHz 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 Ext. mod. 65dBf

24、(60dB) RDS 2% MOD 99.0MHz 18dB 99.0MHz 99.0MHz RDSFig.399.0MHz 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 necessary. FM MUTE/MODE switch: ON/AUTO Dont turn more than 180 Repeat stereo distortion and stere

25、o separation alignment until THD at minimum and separation at maximum. Decode the RDS- Program station AM SECTION AF Modulation: 400Hz, 30% For AH Version Step 1 2 3 530kHz 600kHz 990kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod

26、. 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 531kHz 603kHz 999kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30%

27、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 Maximum For C Version 11 PCB LAYOUT POWER SUPPLY BOARDKEY BOARD LED BOARD 12 MAIN BOARD Trigger In Audio L,R Out 1413 GREEN RED M30

28、2 HNA - 10SM12 M988 SCHEMATIC DIAGRAM KEYBOARD / CPU NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. 1516 TUNER LEFT OUT RIGHT OUT M987 NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAM

29、IC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. 17 IC BLOCK DIAGRAM U201: LC866448B U202: 24C08 S37/PE5 P00 P01 P02 P03 P04 P05 P06 P07 VSS2 P10/SO0 P11/SI0/SB0 P12/SCK0 P13/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

30、 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

31、 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/AN2 P83/AN3 P84/AN4 P85/AN5 P86/AN6 P87/AN7 P71/INT1 P72/INT2/T0IN P73/INT3/T0IN 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41

32、 VCC 8 7 4 6 5 3 2 1 GND WP SCL LOAD LOADINC DATA WORD ADDR/COUNTER Y DEC X DEC R/W COMP SERIAL CONTROL LOGIC EN H.V. PUMP/TIMING DATA RECOVERY EEPROM SERIAL MUX DOUT/ACK LOGIC DEVICE ADDRESS COMPARATOR START STOP LOGIC SDA A2 A1 A0 DIN DOUT 18 U901: LA1837 U303: 74HCT00U402: NJM78M56FA 11A 21B 31Y

33、42A 52B 62Y 7GND 14VCC 134B 124A 114Y 103B 93A 3Y8 1 INPUT 3 OUTPUT 2 GND 123456789101112131415 302928272625242322212019181716 ALC AM OSC AM MIX AM RF.AMP REG AGC AM IF AM S-METER TUNING DRIVE STEREO DRIVE VCC VCC AM/FM IF-BUFF FM S-METER S-CURVE AM IF FM DET GND FM IF INPUT AM MIXER OUTPUT FM IF IN

34、PUT BYPASS AM IF INPUT GND TU-LED ST LED AM-IF OUTPUT FM DETECTOR AM NARROW CF FM S-METER OUTPUT AM S-METER OUTPUT MUTE FM/AM SWITCH PILOT VCO SD COMP DET BUFF DECODER ANTI-BIRIDE 3 rd 5 th STEREO SW MUTE VCO 304kHz FF 38k P-DET FM SD ADJ OSC REG AM RF INPUT AFC AM AGC AM DETECTOR INPUT FM DETECTOR

35、OUTPUT MPX IUTPUT MPX OUTPUT MPX OUTPUT AM STEREO L INPUT AM STEREO R INPUT L-OUT R-OUT FF 19k FF 19k PILOT DET 21 22 16 15 20 23 871714131211109 5 4 3 2 18 19 24 1 6 XIN FMIN AMIN CE DI CL D0 OUT0OUT1 XOUT PHASE DETECTOR CHARGE PUMP REFERENCE DIVIDER SWALLOW COUNTER 1/16, 1/17 4 BIT SHIFT REGISTER

36、LATCH UNIVERSAL COUNTER 1 2 12-BIT PROGRAMMABLE DIVIDER SYC OUT2 OUT3OUT4 OUT5 OUT6IN0IN1 VSS VDD LCTR HCTR PD2 PD1 19 U902: LC72723M Vdda 3 REFERENCE VOLTAGE ANTIALIASING FILTER DATA DECODER VREF 1 VREF FLOUT 5 CIN 6 PLL (57kHz) CLOCK RECOVERY (1187.5Hz) + _ Vddd 11 Vssd 10 RDDA 14 RDCL 15 MODE 12

37、RST 13 RDS-ID/READY 16 Vssa 4 MPXIN 2 TEST 7 TEST 57kHz BPF (SCF) SMOOTHING FILTER OSC CLK(4.332MHz) 9 XIN 8 XOUT RDS-ID DETECT RAM (128bits) U903: LC7218 20 ELECTRICAL PARTS LIST Reference No.Part No.Description KEYBOARD ASSEMBLY PC BOARD 3000PCB-N0930C-KEYKEY PCB ASSY C420 VFD 03032460-1960-0VFD S

38、AMSUNG HNA-105M12 CAPACITORS C201157B-107M-5-KMKCE 6.3V 100F 20% RL 6x7 ELNA C202153F-103J-5-KMCM 50V 0.01F 5% RL 6.0 x7.0 DIODES D2014804-1480-CDIODE 1N4148 ATS D206 *C4804-1480-CDIODE 1N4148 ATS CONNECTORS J202A2101-1581-0FLEXIBLE CONN. 35P P1.25 SIDE ENTRY J203A7705-1150-20045P CONN WIRE ASSY L=1

39、50 26AWG J204A7702-1075-2004CONN.ASSY 2P P2.5 L=75 AWG26 J204B2102-021R-004WAFER 2P P2.5 RIGHT SWITCHES M201, M203, M204, M206,5200-3538-0SWITCH, TACT SKHHBY 7mm HIGH M207, M210, M213, M216 INFRA-RED SENSOR M2184814-3TE2-3IR SENSOR PIC-12043TE2 RESISTORS R2014701-681J-CRCF 1/8W 680R 5% ATS R203, R20

40、44701-122J-CRCF 1/8W 1.2K 5% ATS R2074701-182J-CRCF 1/8W 1.8K 5% ATS R2104701-222J-CRCF 1/8W 2.2K 5% ATS R2134701-472J-CRCF 1/8W 4.7K 5% ATS R220, R2214701-471J-CRCF 1/8W 470R 5% ATS R2224701-473J-CRCF 1/8W 47K 5% ATS R233-R2404701-103J-CRCF 1/8W 10K 5% ATS R241-R2464701-104J-CRCF 1/8W 100K 5% ATS R

41、247, R2484701-103J-CRCF 1/8W 10K 5% ATS R263-R2744701-104J-CRCF 1/8W 100K 5% ATS R291-R2934701-103J-CRCF 1/8W 10K 5% ATS R2944701-122J-CRCF 1/8W 1.2K 5% ATS LED ASSEMBLY PC BOARD 5000PCB-N0930C-LEDPCB ASSY LED N093xC LED D2113700-3517-RGLED RED/GREEN (L-469HGW) CONNECTOR WIRE J201B7703-1320-20043P C

42、ONN WIRE ASSY L=320 26AWG POWER SUPPLY ASSEMBLY PC BOARD 4000 *AHPCB-N0930C-PSUPOWER SUPPLY PCB ASSY C420AH 4000 *CPCB-N0931C-PSUPOWER SUPPLY PCB ASSY C420C SWITCH 0401 5200-3151-0-01POWER SWITCH CAPACITOR C801 8910-0049-0CAP400V 4700P DE7150F472MVA1KC RESISTOR R801 *AH 4717-335J-2-SRMF 1/2W 3.3M 5%

43、 AT UL APPROVED MAIN BOARD ASSEMBLY PC BOARD 2000 *AHPCB-N0930C-TUNPCB ASSY TUNER (AH) N0930C 2000 *CPCB-N0931C-TUNPCB ASSY TUNER (C) N0931C JACKS M9872113-1300-02P RCA JACK W/R AU W/SHIELD M9882113-1121-02P RCA JACK Y/Y AU HSP-242V-22 M3022113-1179-0PHONE JACK D3.5 BK JY-3537-01-140 CAPACITORS C203

44、157B-107M-5-KMKCE 6.3V 100F 20% RL 6x7 ELNA C204153F-103J-5-IMCM 50V 0.01F 5% RL 5x7 C205150F-104Z-5-IUCC 50V 0.1F +80/-20% RL 5x11 C208157D-476M-5-IUKCE 16V 47F 20% RL 5x11 ELNA C210153F-103J-5-IMCM 50V 0.01F 5% RL 5x7 C330150F-104K-2-FCCC 50V 0.1F 10% AT 3.5x2 C331150F-223K-2-FDCC 50V 0.022F 10% A

45、T 3.2x2.2 C332150F-104K-5-IICC 50V 0.1F 10% RL 5x5 C333150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2 C401-C404153F-224J-5-MIBCM 50V 0.22F 5% RL 7x5 C405157D-228M-5-x9ECE 16V 2200F 20% RL 12.5x20 ELNA C406, C407157D-108M-5-S9KCE 16V 1000F 20% RL 10 x20 ELNA C408, C409157D-227M-5-OMKCE 16V 220F 20% RL 8x

46、7 ELNA C410, C411150F-104K-5-IICC 50V 0.1F 10% RL 5x5 C412157D-107M-5-KUKCE 16V 100F 20% RL 6.3x11 ELNA C413157E-108M-5-S9ECE 25V 1000F 20% RL 10 x20 ELNA C414-C418157F-107M-5-KUKCE 50V 100F 20% RL 6.3x11 ELNA C419157C-476M-5-IMKCE 10V 47F 20% RL 5x7 ELNA C420150F-104K-5-IICC 50V 0.1F 10% RL 5x5 C42

47、1157E-107M-5-KUKCE 25V 100F 20% RL 6.3x11 ELNA C901 *C150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2 C902, C903150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2 C904157D-106M-5-GMCE 16V 10F 20% RL 4x7 C906157D-107M-5-KUKCE 16V 100F 20% RL 6.3x11 ELNA C911150F-200J-2-FCCC 50V 20pF 5% AT 3.5x2 C912, C913150F-102

48、K-2-FCCC 50V 1000pF 10% AT 3.5x2 C914, C915150F-101K-2-FCCC 50V 100pF 10% AT 3.5x2 C916150F-331K-2-FCCC 50V 330pF 10% AT 3.5x2 C92415CH-270J-5-GGCTC 0/60 27pF 5% RL 4x4 C92515CH-200J-5-GGCTC 0/60 20pF 5% RL 4x4 C926153F-333J-5-NLMCM 50V 0.033F 5% RL 7.5 x6.5 Metalzd C927157F-225M-5-GMCE 50V 2.2F 20%

49、 RL 4x7 C928157D-106M-5-GMCE 16V 10F 20% RL 4x7 C929157F-224M-5-GMCE 50V 0.22F 20% RL 4x7 C930150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2 21 Reference No.Part No.Description C931157B-107M-5-KMCE 6.3V 100F 20% RL 6x7 C932, C941150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2 C942157D-107M-5-KUKCE 16V 100F 20% RL 6.3x11 ELNA C943157F-225M-5-GMCE 50V 2.2F 20% RL 4x7 C944157F-475M-5-GMCE 50V 4.7F 20% RL 4x7 C945150F-101K-2-FCCC 50V 100pF 10% AT 3.5x2 C946157F-105M-5-GMCE 50V 1F 20% RL 4x7 C947157F-474M-5-GMCE 50V 0.47F 20% RL 4x7 C948157F-105M-5-GMCE 50V 1F 20% RL 4x7 C949