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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

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

9

INSTRUMENT SETUP

1. FM MEASUREMENT

Fig. 1

Fig. 2

2. RDS MEASUREMENT

Fig. 3

3. AM MEASUREMENT

Fig. 4

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Summary of Contents for C420

Page 1: ...NAD SERVICE MANUAL C 420 STEREO AM FM TUNER C 420STEREO AM FM TUNER ...

Page 2: ...e 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 16 IC BLOCK DIAGRAM 17 19 ELECTRICAL PARTS LI...

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: ... 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 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 ...

Page 5: ...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 5 ...

Page 6: ...1837 MUTING DIODE MATRIX NAD LINK IN OUT M218 REMOTE SENSOR POWER SUPPLY VFD VP 5V CPU 10V AC INPUT L R VT VT ce data clk RDS CLK RDS SIG RDS 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 2 3 4 5 15 23 19 58 6 IN 2 OUT 24 16 14 79 16 14 22 78 71 72 5 75 76 74 19 18 ...

Page 7: ...7 WIRING DIAGRAM MAIN BOARD KEY BOARD LED BOARD TRANSFORMER YELLOW BLUE WHITE POWER SUPPLY BOARD Trigger In Audio L R Out ...

Page 8: ...8 ADJUSTMENT POINTS DIAGRAM OSC RF VT Trigger In Audio L R Out ...

Page 9: ...T 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 9 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 Versio...

Page 11: ...11 PCB LAYOUT POWER SUPPLY BOARD KEY BOARD LED BOARD ...

Page 12: ...12 MAIN BOARD Trigger In Audio L R Out ...

Page 13: ...14 13 GREEN RED M302 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 ...

Page 14: ...15 16 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: ...26 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 ...

Page 16: ...CC V CC AM FM IF BUFF FM S METER S CURVE 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 V CO 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 OUTPU...

Page 17: ... 1 2 12 BIT PROGRAMMABLE DIVIDER SYC OUT2 OUT3 OUT4 OUT5 OUT6 IN0 IN1 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 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: ...SWITCH TACT SKHHBY 7mm HIGH M207 M210 M213 M216 INFRA RED SENSOR M218 4814 3TE2 3 IR SENSOR PIC 12043TE2 RESISTORS R201 4701 681J C RCF 1 8W 680R 5 ATS R203 R204 4701 122J C RCF 1 8W 1 2K 5 ATS R207 4701 182J C RCF 1 8W 1 8K 5 ATS R210 4701 222J C RCF 1 8W 2 2K 5 ATS R213 4701 472J C RCF 1 8W 4 7K 5 ATS R220 R221 4701 471J C RCF 1 8W 470R 5 ATS R222 4701 473J C RCF 1 8W 47K 5 ATS R233 R240 4701 10...

Page 19: ...D 228M 5 x9E CE 16V 2200µF 20 RL 12 5x20 ELNA C406 C407 157D 108M 5 S9K CE 16V 1000µF 20 RL 10x20 ELNA C408 C409 157D 227M 5 OMK CE 16V 220µF 20 RL 8x7 ELNA C410 C411 150F 104K 5 II CC 50V 0 1µF 10 RL 5x5 C412 157D 107M 5 KUK CE 16V 100µF 20 RL 6 3x11 ELNA C413 157E 108M 5 S9E CE 25V 1000µF 20 RL 10x20 ELNA C414 C418 157F 107M 5 KUK CE 50V 100µF 20 RL 6 3x11 ELNA C419 157C 476M 5 IMK CE 10V 47µF 2...

Page 20: ...L 4x7 C976 150F 223K 2 FD CC 50V 0 022µF 10 AT 3 2x2 2 C977 157F 225M 5 GM CE 50V 2 2µF 20 RL 4x7 C978 150F 223K 2 FD CC 50V 0 022µF 10 AT 3 2x2 2 C979 157D 226M 5 GM CE 16V 22µF 20 RL 4x7 C980 153F 224J 5 MIB CM 50V 0 22µF 5 RL 7x5 C981 150F 223K 2 FD CC 50V 0 022µF 10 AT 3 2x2 2 C982 150F 101K 2 FC CC 50V 100pF 10 AT 3 5x2 C985 150F 561K 2 FC CC 50V 560pF 10 AT 3 5x2 C986 157B 107M 5 KM CE 6 3V ...

Page 21: ...A950 Y HFE 100 200 Q403 4860 0050 5 TR SS8050 C D SAMSUNG RL Q901 C 485C 945P 5 TR 2SC945P HFE 200 400 Q902 4851 9230 5 TR 2SC1923 0 HFE 70 140 Q903 485A 114E 5 TR DTA114ESA ROHM Q922 Q923 Q942 4860 1590 5 TR 2SC1740S R HFE180 390 Q943 Q944 4860 8120 0 TR 2SD 1468 S Q945 485A 114E 5 TR DTA114ESA ROHM Q980 485C 114E 5 TR DTC114ES Q981 485A 114E 5 TR DTA114ESA ROHM Q982 4853 63BL 5 TR N JFET 2SK 363...

Page 22: ...K 5 ATS R950 4701 684J C RCF 1 8W 680K 5 ATS R951 4701 102J C RCF 1 8W 1K 5 ATS R952 R953 4701 223J C RCF 1 8W 22K 5 ATS R954 4701 103J C RCF 1 8W 10K 5 ATS R955 4701 220J C RCF 1 8W 22R 5 ATS R956 4756 1036 3 06 SVR 10K H3 7x7 6 RH0615C R957 R958 AH 4701 432J 2 RCF 1 8W 4 3K 5 AT R957 R958 C 4701 302J C RCF 1 8W 3K 5 ATS R959 R960 AH 4701 623J 2 RCF 1 8W 62K 5 AT R959 R960 C 4701 154J C RCF 1 8W ...

Page 23: ...3131 9040 0 IC LC72723M RDS DEMODULATOR MFP16 U903 3131 3760 0 IC LC7218 PLL FREQ SYNTHESIZER SANYO 25 Reference No Part No Description NOTE The components identified by mark are critical for risk of fire and electrical shock Replace only with part number specified AH USA Canadian model only C European model only Capacitors CP Polystyrene CM Mylar CE Electrolytic CC Ceramic CTC NPO Resistors RMF M...

Page 24: ...26 EXPLODED VIEW ...

Page 25: ...REW M3X6 3 0116 2954 3008 0000 TAPPING 3X8MM B TITE YEL ZN 20 0117 2954 3006 0000 3X6MM B TITE YEL ZN 2 0119 2954 3008 3000 T3X8MM SELF TAPPING 14 0126 3716 4314 0 WINDOW LENS W SS 1 0127 1402 3782 1 STRAP 1 0129 4152 3851 0 SQ STRAIN RELIEF BUSHING 1 0130 4152 4331 0 POWER BUTTON BEZEL 1 0131 4152 4631 0 RUBBER FOOT 14MM HIGH 4 0132 4152 4641 0 CUSHION FOOT 4 0133 4154 0031 0 BEZEL TRIO 2 0134 41...

Page 26: ...7 1332 1 POLYBAG UNIT 1 6 1497 1432 0 FASCIA COVER 1 7 4301 4868 1 INSTRUCTION MANUAL 1 8 2103 7302 1 RCA CABLE 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 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 C...

Page 27: ...SERVICE MANUAL NAD 2001 C 420 STEREO AM FM TUNER NAD ELECTRONICS INTERNATIONAL TORONTO ...

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