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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 <

PRESET/TUNE >

DISPLAY

STORE

BLEND

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Summary of Contents for C422

Page 1: ...NAD C 422 STEREO AM FM TUNER C 422STEREO AM FM TUNER SERVICE MANUAL ...

Page 2: ... critical with regard to the risk of fire and electric shock Replace only with parts recommended by the manufacturer CONTENTS DESCRIPTION PAGE SPECIFICATIONS 3 REAR PANEL FRONT PANEL 4 DISASSEMBLY INSTRUCTIONS 5 BLOCK DIAGRAM 6 WIRING DIAGRAM 7 ADJUSTMENT POINTS DIAGRAM 8 INSTRUMENT SETUP 9 ALIGNMENT PROCEDURES 10 PCB LAYOUT 11 12 SCHEMATIC DIAGRAM 13 14 IC BLOCK DIAGRAM 15 17 ELECTRICAL PARTS LIS...

Page 3: ...3 dBµ Signal Noise Ratio Mono 72 dB 72 dB 60 dBµ IHF wtd Stereo 66 dB 66 dB Frequency Response 20 Hz 15 kHz 60 dBµ 0 1 0 dB 0 1 0 dB Channel Separation 60 dBµ 30 Hz 33 dB 33 dB 1 kHz 42 dB 42 dB 10 kHz 32 dB 32 dB Alternate Channel Sensitivity 40 dBµ 400 kHz 60 dB 45 dB Capture Ratio 40 dBµ 3 dB 3 dB AM Suppression 60 dBµ 100 Mod FM 30 Mod AM 65 dB 65 dB Image Rejection 119 4 MHz 85 dB 85 dB I F R...

Page 4: ...GGER IN IR IN 6 3 4 5 1 2 PRESET TUNE MEMORY AM FM DISPLAY DELETE BLEND FM MUTE MODE PRESET TUNE 2003 NAD C 422 PRESET PRESET PROGRAM PROGRAM FM MUTE FM MUTE BLEND BLEND TUNED TUNED FM ST FM ST RDS RDS ANTENNA ANTENNA 3 4 5 6 7 1 10 9 8 2 RDS Stereo Tuner 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 DO...

Page 5: ...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 Refer to Figure No 2 Figure No 2 ...

Page 6: ...AT R IX 12V T R IG G E R IN IR IN M218 R E MOT E S E NS OR P OWE R S UP P LY V F D V P 5V C P U 10V AC INP UT L R V T V T ce data clk R DS C LK R DS S IG R DS DATA MP XIN data out 1 P ower On 2 P rotect F las h 2Hz 1 2 S tandby 1 2 LC 7218 U903 S T MO MUT E S ME T E R T UNE F M OS C IF AM OS C IF 1 27 17 16 23 2 30 U902 21 2 3 4 5 15 23 19 58 6 IR IN 22 12V T R IG G E R IN 24 16 14 79 16 14 22 78 ...

Page 7: ... 7 WIR ING DIAGR AM MAIN BOAR D KE Y BOAR D LE D BOAR D TR ANS FOR ME R YE LLOW BLUE WHITE POWE R S UPPLY BOAR D ...

Page 8: ... 8 ADJUSTMENT POINTS DIAGRAM VT OSC RF ...

Page 9: ...TPUT 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 RDS 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 ...

Page 10: ... RDS Fig 3 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 necessary FM MUTE MODE switch ON AUTO Don t 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 Versi...

Page 11: ... 11 PCB LAYOUT POWE R S UPPLY B OAR D K E Y B OAR D LE D B OAR D ...

Page 12: ...MAIN BOARD 12 ...

Page 13: ... 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 PRESET TUNE DISPLAY STORE BLEND ...

Page 14: ... 14 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 ...

Page 15: ...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 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 ...

Page 16: ... ST LED AM IF OUTPUT FM DETECTOR AM NARROW CF FM S METER OUTPUT AM S METER OUTPUT MUTE FM AM SWITCH PILOT V CO SD COMP DET BUFF DECODER ANTI BIRIDE 3 rd 5 th STEREO SW MUTE VCO 304kHz FF 38k P DET Ø FM SD ADJ OSC REG 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 Inpu...

Page 17: ...TER 1 2 12 BIT PROGRAMMABLE DIVIDER SYC OUT2 OUT3 OUT4 OUT5 OUT6 IN0 IN1 VSS VDD LCTR HCTR PD2 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 XOUT RDS ID DETECT RA...

Page 18: ... 4701 472J 2 RCF 1 8W 4 7K 5 AT R220 R221 4701 471J 2 RCF 1 8W 470R 5 AT R222 4701 473J 2 RCF 1 8W 47K 5 AT R233 R240 R247 R248 R291 R293 4701 103J 2 RCF 1 8W 10K 5 AT R241 R246 R263 R272 4701 104J 2 RCF 1 8W 100K 5 AT DIODE D201 4804 1480 C DIODE 1N4148 ATS D203 4837 5B61 2 DZ 1 2W 5 45 5 73 ROHM SWITCH M201 M204 M207 M210 M213 M216 5200 3538 0 SWITCH TACT SKHHBY 7MM M203 M206 5200 4721 0 TACT SW...

Page 19: ...910 0049 0 CAP400V 4700P RESISTOR R801 AH 4717 335J 2 S RMF 1 2W 3 3M 5 AT UL SWITCH 0401 5200 3151 0 01 POWER SWITCH PC BOARD 0400 1725 080B 0100 PCB MAIN KEY VFD N0A50C MISCELLANEOUS M801 M803 M806 4132 1071 0 TERMINAL PIN TUN ASSY PC BOARD AH PCB N0A50C TUN PCB ASSY TUN N0A50C CE PCB N0A51C TUN PCB ASSY TUN N0A51C CAPACITOR C203 157B 107M 5 KMK CE 6 3V 100µF 20 RL 6x7 C204 C210 153F 103J 5 IM C...

Page 20: ...C 50V 100pF 10 AT 3 5x2 C916 150F 331K 2 FC CC 50V 330pF 10 AT 3 5x2 C924 15CH 270J 5 GG CTC 0 60 27pF 5 RL 4x4 C925 15CH 200J 5 GG CTC 0 60 20pF 5 RL 4x4 C926 153F 333J 5 NLM CM 50V 0 033µF 5 RL 7 5 C927 C943 C977 157F 225M 5 GM CE 50V 2 2µF 20 RL 4x7 C929 157F 224M 5 GM CE 50V 0 22µF 20 RL 4x7 C931 C986 C990 157B 107M 5 KM CE 6 3V 100µF 20 RL 6x7 C944 157F 475M 5 GM CE 50V 4 7µF 20 RL 4x7 C946 C...

Page 21: ...5 NH CRYSTAL M905 2300 0440 0 CRYSTAL 7 2MHZ 20PPM M985 2300 1220 0 CRYSTAL 4 332MHZ CERAMIC FILTER M902 M904 2701 0010 1 CF10 7 30 M903 CE 2701 0010 1 CF10 7 30 M911 2701 0680 0 CF 450 1 IC U201 3131 9750 1 IC LC866448B 8 BIT U202 3131 7250 0 IC 24C08 8K EEPROM U402 3130 8190 0 IC NJM78M56FA 5 6V U701 3130 4990 0 IC LM393D DUAL VOLTAGE U901 3130 8180 0 IC LA1837 AM FM IF U902 3131 9040 0 IC LC727...

Page 22: ... 2 RCF 1 8W 82R 5 AT R928 4701 221J 2 RCF 1 8W 220R 5 AT R945 4701 512J 2 RCF 1 8W 5 1K 5 AT R950 4701 684J 2 RCF 1 8W 680K 5 AT R957 R958 CE 4701 302J 2 RCF 1 8W 3K 5 AT R957 R958 AH 4701 432J 2 RCF 1 8W 4 3K 5 AT R959 R960 CE 4701 154J 2 RCF 1 8W 150K 5 AT R959 R960 AH 4701 623J 2 RCF 1 8W 62K 5 AT R973 4701 183J 2 RCF 1 8W 18K 5 AT R975 AH 4701 243J 2 RCF 1 8W 24K 5 AT R975 CE 4701 563J 2 RCF 1...

Page 23: ...0A50C MISCELLANEOUS L903 L904 5600 3386 S COIL MPX LPF NMC 4085 L941 5600 3396 S COIL FM DET 1 10 7MHZ L942 5600 3406 S COIL FM DET 2 10 7MHZ L971 5600 3280 G COIL MW RF BLOCK L972 5600 3416 S COIL AM IFT NMIF 4062 M219 2703 0200 0 CR 6MHZ CSTLA6M00G55 A0 R801A AH 4132 1061 0 SOLDER TAG TUNER 4131 7701 0 ANTENNA WASHER Reference No Part No Description NOTE The components identified by mark are cri...

Page 24: ... 24 EXPLODED VIEW ...

Page 25: ...AL WASHER 0112 AH TI CE TI 2900 4006 2010 SCM PW M4X6 RECESS WHITE 0112 AH GREY CE GREY 2900 4006 3010 M4X0 5PX6MM W FLAT 0113 2900 4010 3030 PH W WASHER M4X10 BL ZN 0114 2904 3006 0000 SCREW M3X6 0116 2954 3008 0000 TAPPING 3X8MM B TITE 0117 2954 3006 0000 3X6MM B TITE YEL ZN 0118 2954 3008 0000 TAPPING 3X8MM B TITE 0119 2954 3008 3000 T3X8MM SELF TAPPING 0120 AH GREY CE GREY 2954 3008 3000 T3X8M...

Page 26: ...EY AH TI 7009 3100 2 AC CORD 18AWGX2 0136 CE GREY CE TI 7009 3110 0 AC CORD SEMKO 0137 3714 5706 0 LED LENS 412 CLEAR SAN 0140 2954 3008 0000 TAPPING 3X8MM B TITE 0141 2954 3008 0000 TAPPING 3X8MM B TITE 0143 2600 3005 0803 METAL WASHER M3X0 5X8MM 0144 2954 3008 0000 TAPPING 3X8MM B TITE 0146 2954 2006 0000 TAPPING SCREW 2X6 J202C 7012 5260 0 FLEXIBLE CABLE 35P L 150 ITEM Part No Description ...

Page 27: ... EPE BAG 412 1 7 4301 7074 1 INSTRUCTION MANUAL 1 8 2103 7302 1 RCA PLUG MALE 1 9 2107 0661 1 300 OHM T ANTENNA 1 10 2113 1155 0 AM LOOP ANTENNA 1 11 2103 6101 0 RF CONNECTION PLUG F TYPE 1 12 1450 2520 0 WHITE PAPER 1 Proprietary information for servicing purposes only The information herein may not be used com mercially without the prior written agreement of NAD Electronics International Toronto...

Page 28: ...SERVICE MANUAL NAD 2004 C 422 STEREO AM FM TUNER NAD ELECTRONICS INTERNATIONAL TORONTO ...

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