NAD-C422-tun-sm 电路图 维修手册.pdf

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1、NAD C 422 STEREO AM/FM TUNER C 422 STEREO AM/FM TUNER SERVICE MANUAL 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 accep

2、tably 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 DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . PAGE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 DISASSEMBLY I

4、NSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . .

5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 INSTRUMENT SETUP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、 . . . . . . . 9 ALIGNMENT PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12 SCHEMATIC DIAGRAM . . . . . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14 IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-17 ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、. . . . . . . . . . . . . . . . . . . . 18-23 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-26 PACK

9、ING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 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 Sensit

10、ivity (999/1000kHz)30dB S/N Ratio (5mV in)38dB THD (5mV in)3% IF Rejection (450kHz)36dB Image Rejection (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

11、Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator Usable 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 dB3

12、3 dB 1 kHz42 dB42 dB 10 kHz32 dB32 dB Alternate Channel Sensitivity (40 dB, 400 kHz)60 dB45 dB Capture 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

13、 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mono0.25%0.25% Stereo0.35%0.35% Auto-Search sensitivityOn24 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) RadioFa

14、ns.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. OUTPUT 4. IR IN 5. 12V TRIGGER IN 6. AC LINE CORD 1. POWER ON / OFF 2. POWER STATUS INDICATOR 3. BLEND 4. MEMORY 5. FM MUTE / MODE 6. AM / FM 7. DISPLAY 8. PRESET / TUNE 9. DISPLAY AREA 10. PRESET /

15、 TUNE CONTROL 2003 NAD C 422 OUTPUT ANTENNA GNDAM FM L R L R +12V TRIGGER IN IR IN 634512 PRESET / TUNE MEMORYAM / FMDISPLAY DELETE BLEND FM MUTE / MODE PRESET / TUNE 2003 NAD C 422 PRESETPRESET PROGRAMPROGRAMFM MUTEFM MUTEBLENDBLENDTUNEDTUNEDFM STFM STRDSRDS ANTENNAANTENNA 34567110982 RDS Stereo Tu

16、ner C 422 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 D206: 10KHz / Delete D206: 9KHz.

17、 - 5 - 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 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

18、 the direction as indicated by the arrow 7 . Refer to Figure No.2. Figure No.2. - 6 - BLOCK DIAGRAM AM LOOP ANTFM 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 12V TRIGGER IN IR IN M218 R

19、EMOTE SENSOR POWER SUPPLY VFD -VP +5V CPU +10V AC INPUT L R VT VT cedataclkRDS-CLKRDS-SIGRDS-DATA MPXIN data out (#1)=Power 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 -IR IN 22-12V TRIG

20、GER IN 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 SUPPLY BOARD - 8 - ADJUSTMENT POINTS DIAGRAM VT OSCRF - 9 - FM SIGNAL GENERATOR ANTENNA TERMINAL OUTPUT TERMINAL DISTORTION METER DISTORTION METER AC VOLTMETER OS

21、CILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE OUTPUT TERMINAL OUTPUT TERMINAL 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 RD

22、S GENERATOR FM STEREO GENERATOR P901 OUTPUT TERMINAL DC MILLIVOLT- METER UNIT UNIT UNIT UNIT INSTRUMENT 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 de

23、vi., 60dB/V Pilot signal 19kHz 7.5kHz devi. OUTPUTS - Connect the 47Kohm resistor unless otherwise noted. 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

24、Minimum 2AC voltmeter IFT on the front end IFT on the front end Maximum Maximum separation Distortion 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

25、frequency 99.0MHz 99.0MHz Channel L or R 1kHz 99.0MHz Ext. mod. 65dBf (60dB) 99.0MHz Ext. mod. 65dBf (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

26、is necessary. 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. Decode the RDS- Program station AM SECTION AF Modulation: 400Hz, 30% For AH Version Step 1 2 3 530kHz 600kHz 990kHz 600kHz 400Hz

27、 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 531kHz 603kHz 999kHz 600kHz 40

28、0Hz 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 Maximum For C Version - 11 - P

29、CB LAYOUT POWER SUPPLY BOARD KEY BOARD LED BOARD MAIN BOARD - 12 - - 13 - SCHEMATIC DIAGRAM KEYBOARD / DISPLAY NOTE:1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. MODE FM/AM FM MUTE PRESET/TUNE DISPLAY STORE BLEND - 14 -

30、 TUNER LEFT OUT RIGHT OUT M987 NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. - 15 - IC BLOCK DIAGRAM U201: LC866448B U202: 24C08U402: NJM78M56FA S37/PE5 P00 P01 P02 P03 P04 P05 P06 P07 VSS2 P10/SO0 P11/SI0/SB0 P12

31、/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 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/P

32、D6 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/AN2 P83/AN3 P84/AN4 P8

33、5/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 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

34、 LOGIC DEVICE ADDRESS COMPARATOR START STOP LOGIC SDA A2 A1 A0 DIN DOUT 1 INPUT 3 OUTPUT 2 GND - 16 - U901: LA1837 U701: LM393D 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

35、 AM IF FM DET GND FM IF INPUT AM MIXER OUTPUT FM IF INPUT 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

36、 AM RF INPUT AFC AM AGC AM DETECTOR INPUT FM DETECTOR 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 Non-inverting Input Inverting Input 3.5A100A3.5A100A CC V CC V CC V CC V O V GND P4 P1&P7 P8 P2&P6 P3&P5 Dual-In-Line/SOICPackage - 17

37、 - 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 LATCH UNIVERSAL COUNTER 1 2 12-BIT PROGRAMMABLE DIVIDER SYC OUT2 OUT3OUT4 OUT5 OUT6IN0IN1 VSS VDD LCTR HCTR P

38、D2 PD1 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 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 XOU

39、T RDS-ID DETECT RAM (128bits) U903: LC7218 - 18 - ELECTRICAL PARTS LIST KEY ASSY PC BOARD PCB-N0A50C-KEYPCB ASSY KEY N0A50C CAPACITOR C201157B-107M-5-KMKCE 6.3V 100F 20% RL C202153F-103J-5-KMCM 50V 0.01F 5% RL COIL L2011801-220K-MCOIL 22H 10% AL BL7 WAFER/CONNECTOR J202A2101-1581-0FLEXIBLE CONN. 35P

40、 J204B2102-021R-004WAFER 2P P2.5 RIGHT RESISTOR R2014701-681J-2RCF 1/8W 680R 5% AT R203,R204,R2944701-122J-2RCF 1/8W 1.2K 5% AT R2074701-182J-2RCF 1/8W 1.8K 5% AT R2104701-222J-2RCF 1/8W 2.2K 5% AT R2134701-472J-2RCF 1/8W 4.7K 5% AT R220,R2214701-471J-2RCF 1/8W 470R 5% AT R2224701-473J-2RCF 1/8W 47K

41、 5% AT R233-R240,R247,R248,R291-R2934701-103J-2RCF 1/8W 10K 5% AT R241-R246,R263-R2724701-104J-2RCF 1/8W 100K 5% AT DIODE D2014804-1480-CDIODE 1N4148 ATS D2034837-5B61-2DZ 1/2W 5.45-5.73 ROHM SWITCH M201,M204,M207,M210,M213,M2165200-3538-0SWITCH, TACT SKHHBY 7MM M203,M2065200-4721-0TACT SWITCH (RIGH

42、T WIRE J203A7705-1150-20045P CONN WIRE ASSY L=150 J204A7702-1075-2004CONN.ASSY 2P P2.5 L=75 PC BOARD 03001725-080B-0100PCB MAIN/KEY/VFD N0A50C MISCELLANEOUS 03024154-2101-0VFD HOLDER 03032460-1960-0VFD, SAMSUNG,HNA-10SM12 Reference No.Part No.Description M2184814-3TE2-3IR SENSOR PIC-12043TE2 LED ASS

43、Y PC BOARD PCB-N0A50C-LEDPCB ASSY LED N0A50C LED D2113700-3517-RGLED RED/GREEN (L-469HGW) WIRE J201B7703-1320-20043P CONN WIRE ASSY L=320 PC BOARD 1725-080B-0100PCB MAIN/KEY/VFD N0A50C PSU ASSY PC BOARD *AHPCB-N0A50C-PSUPCB ASSY PSU N0A50C *CEPCB-N0A51C-PSUPCB ASSY PSU N0A51C CAPACITOR C801 8910-004

44、9-0CAP400V 4700P RESISTOR R801 *AH4717-335J-2-SRMF 1/2W 3.3M 5% AT UL SWITCH 0401 5200-3151-0-01POWER SWITCH PC BOARD 04001725-080B-0100PCB MAIN/KEY/VFD N0A50C MISCELLANEOUS M801,M803-M8064132-1071-0TERMINAL PIN TUN ASSY PC BOARD *AHPCB-N0A50C-TUNPCB ASSY TUN N0A50C *CEPCB-N0A51C-TUNPCB ASSY TUN N0A

45、51C CAPACITOR C203157B-107M-5-KMKCE 6.3V 100F 20% RL 6x7 C204,C210153F-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 - 19 - Reference No.Part No.Description - 20 - C401,C402,C403,C404153F-224J-5-MIBCM 50V 0.22F 5% RL 7x5 C405

46、157D-228M-5-X9ECE 16V 2200F 20% RL 12.5x20 C406,C407157D-108M-5-S9KCE 16V 1000F 20% RL 10 x20 C408,C409157D-227M-5-OMKCE 16V 220F 20% RL 8x7 C410,C411,C420,C706150F-104K-5-IICC 50V 0.1F 10% RL 5x5 C412,C414,C906,C942157D-107M-5-KUKCE 16V 100F 20% RL 6x11 C413,C421157E-108M-5-S9ECE 25V 1000F 20% RL 1

47、0X20 C415157F-107M-5-OWCE 50V 100F 20% RL 8x12 C416,C417,C418157F-107M-5-OVKCE 50V 100F 20% RL 8x11.5 C419157C-476M-5-IMKCE 10V 47F 20% RL 5X7 C702,C707153F-102J-5-IMCM 50V 1000PF 5% RL 5x7 C703150F-103K-5-IICC 50V 0.01F 10% RL 5x5 C705150F-681J-5-OICC 50V 680PF 5% RL 8X5 C709157C-107M-5-IUCE 10V 10

48、0F 20% RL 5x11 C901 *CE150F-223K-2-FDCC 50V 0.022F 10% AT C902,C903,C930,C932,C941,C949,150F-223K-2-FDCC 50V 0.022F 10% AT C950,C968,C970,C974,C976,C978, C981,C987 C904,C928,C975157D-106M-5-GMCE 16V 10F 20% RL 4x7 C911150F-200J-2-FCCC 50V 20pF 5% AT 3.5x2 C912,C913150F-102K-2-FCCC 50V 1000pF 10% AT

49、3.5x2 C914,C915,C945,C982150F-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 C927,C943,C977157F-225M-5-GMCE 50V 2.2F 20% RL 4x7 C929157F-224M-5-GMCE 50V 0.22F 20% RL 4x7 C931,C986,C990157B-107M-5-KMCE 6.3V 100F 20% RL 6x7 C944157F-475M-5-GMCE 50V 4.7F 20% RL 4x7 C946,C948157F-105M-5-GMCE 50V 1F 20% RL 4x7 C947157F-474M-5-GMCE 50V 0.47F 20% RL 4x7 C951157E-475M-5-GMECE 25V 4.7F 20% RL 4X7 C953,C954,C96