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NAD

C 426

S T E R E O

AM/FM TUNER

C 426

STEREO

AM/FM TUNER

SER

VICE MANUAL

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Summary of Contents for C 426

Page 1: ...NAD C 426 STEREO AM FM TUNER C 426STEREO 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 4 REAR PANEL FRONT PANEL 5 DISASSEMBLY IN...

Page 3: ...tem 8 1000 7 Output 999 mV 100 180 30 10mV 1000 8 Loop sensitivity 20dB S N 999 1000 dB 68 603 600 dB 68 1404 1400 dB 68 9 Frequency response 100 2 3KHz 999 1000 dB 0 6dB 400 Hz 5mV FM BAND SPECIFICAT...

Page 4: ...dB 0 1 5 1KHz Ref UL 75Us CE50Us 10 Channel Separation 30 Hz dB 28 60dBu IHF wtd 1 KHz dB 38 10KHz dB 28 11 Alternate channel selectivity 400KHz IHF UL dB 35 CE dB 60 12 Muting level dBu 18 6 13 Outpu...

Page 5: ...ENSOR 10 VFD 11 PRESET TUNE CONTROL KNOB 1 2 3 4 5 6 7 8 9 10 11 FRONT PANEL 1 4 3 2 5 6 7 REAR PANEL IMPORTANT NOTES 1 Show the software version Press DISPLAY and FM AM 2 Light UP all the icon on the...

Page 6: ...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 remo...

Page 7: ...1 AM FM IF LA1837 MUTING IR IN U701 74HC86 STANDBY POWER SUPPLY RS232 M218 REMOTE SENSOR POWER SUPPLY VFD STANDBY 3V3 VP 5V CPU 10V AC INPUT RELAY L R VT VT ce data clk RDS CLK RDS SIG RDS DATA MPXIN...

Page 8: ...8 WIRING DIAGRAM TRANSFORMER MAIN board DSP board PSU board LED board KEY board YELLOW BLUE WHITE 7013 0490 0...

Page 9: ...9 ADJUSTMENT POINTS DIAGRAM OSC RF VT...

Page 10: ...PUT 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 GEN...

Page 11: ...Channel L or R 1kHz 99 0MHz Oscilloscope R941 Maximum separation Repeat stereo distortion and stereo separation alignment until THD at minimum and separation at maximum Distortion Meter Minimum Mute...

Page 12: ...18 J19 J20 J21 J26 J27 J28 J29 J30 J31 J32 J33 J34 J35 J36 J37 J38 M210 J202A J2 J3 C202 C201 C212 C213 C211 C210 R222 R221 R220 R219 Q201 R227 R216 R215 J263 R210 R211 J264 R225 D206 J265 J270 J262 R...

Page 13: ...J950 R946 J949 C911 C944 R945 C945 J941 C932 C969 C979 C981 C982 C978 C977 C976 C975 C974 C971 C973 C927 C912 Q922 C913 Q923 C902 C903 C926 C928 C929 Q902 C901 Q901 C904 Q903 C914 C915 C930 C931 C925...

Page 14: ...14 MAIN BOARD Bottom side 1 8 9 16 1 14 15 28 1 7 8 14 1 8 9 16...

Page 15: ...24 P0 3 23 P0 4 22 P0 5 21 VDD 20 P0 6 19 P0 7 17 P1 1 18 P1 0 16 P2 5 15 P2 4 U201 P89LCP936 C223 100u C222 104K R215 470R R216 470R R219 680R R220 820R R221 1K8 R222 680R 49 LED2 50 LED1 51 GND 52...

Page 16: ...3 0R M985 4 332MHz C989 30P NPO C988 30p NPO C985 561 C987 223Z C986 6V3 100u C990 6V3 100u R987 1K R986 1K R985 1K L985 100uH R953 22K R952 22K R922 1K R921 1K C925 20P NPO C924 20P NPO R923 1K C930...

Page 17: ...100u C401 223K 1 2 3 4 5 6 7 8 J401 C419 10V 47u B C E Q403 8050 D412 10V C421 16V 47u R404 1K AC INPUT IN GND OUT U402 78M05 R418 47K D101 1N4007 D102 1N4007 D103 1N4007 D104 1N4007 C102 400V 4 7U L1...

Page 18: ...ing Circuit Grid Driver Segment Driver Grid Driver Key Scan Output Control Dispaly Memory Timing Generator Key Matrix Memory SG2 KS2 SG3 KS3 SG4 KS4 SG5 KS5 SG6 KS6 SG7 KS7 SG8 KS8 SG9 KS9 SG10 KS10 S...

Page 19: ...R AND OSCILLATOR TIMER 0 TIMER 1 REAL TIME CLOCK SYSTEM TIMER SPI ADC1 DAC1 ADC0 DAC0 P89LPC935 936 P3 1 0 P2 7 0 P1 7 0 P0 7 0 X2 X1 TXD RXD SCL SDA T0 T1 CMP2 CIN2B CIN2A CMP1 CIN1A CIN1B OCA OCB OC...

Page 20: ...3 12 11 10 9 8 1A 1B 1Y 2A 2B 2Y GND VCC 4B 4A 4Y 3B 3A 3Y 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 ALC AM OSC AM MIX AM RF AMP REG AGC AM IF AM S METER TUNING...

Page 21: ...TEST 57kHz BPF SCF SMOOTHING FILTER OSC CLK 4 332MHz 9 XIN 8 XOUT RDS ID DETECT RAM 128bits 21 22 16 15 20 23 8 7 17 14 13 12 11 10 9 5 4 3 2 18 19 24 1 6 XIN FMIN AMIN CE DI CL D0 OUT0 OUT1 XOUT PHA...

Page 22: ...4 V 18 k Error flag armed EMI Jittering VCC Startup Source Drain Flip Flop DCmax 65 Reset Reset High when VCC 3 V Driver S Q R Iref 7 4 mA IVCC Set Q VCC 8 Rsense 250 ns L E B 7 5 Soft Start Startup...

Page 23: ...STOR Q201 485C 114E K TR DTC114ES RLT RESISTOR R221 4705 182J C RCF 1 4W 1 8K 5 ATS R219 R222 4705 681J C RCF 1 4W 680R 5 ATS R220 R252 4705 821J C RCF 1 4W 820R 5 ATS R210 R211 4711 151A 2 RMF 1 8W 1...

Page 24: ...04 SVC C42626 LED PCB ASSY LED EU CA PC BOARD 1006 1726 042A 000B PCB MAIN KEY DIS PSU LED WAFER SOCKET J203B2 2102 040R J01 WAFER 4P P2 0 90DEG MISCELLANEOUS D209 3700 2858 AB LED SP 5X5XL0 5 AM BU M...

Page 25: ...RLT 5x5 C707 153F 102J K IM CM 50V 1000P 5 RLT 5x7 C708 150F 104K K II CC 50V 0 1U 10 RLT 5x5 C709 157D 477M K OVE CE 16V 470U 20 RLT C901 EU 150F 223K 2 FD CC 50V 0 022uF 10 AT C902 C903 150F 223K 2...

Page 26: ...C970 150F 223K 2 FD CC 50V 0 022uF 10 AT C971 15CH 080D 5 GG CTC 0 60 8pF 0 5pF RL C973 153I 473J V NLM CM 63V 0 047U 5 RBT 7 2 C974 150F 223K 2 FD CC 50V 0 022uF 10 AT C975 157D 106M K IU CE 16V 10U...

Page 27: ...P2 5 RIGHT J401B 2102 081S 004 WAFER 8P P2 5 ST O205 EU 2107 0681 0 ANT TERMINAL DIN TYPE O205 CA 2107 0641 0 ANT TERMINAL F TYPE JACK SOCKET M303 2113 1179 0 PHONE JACK D3 5 BK M987 2113 1300 0 2P R...

Page 28: ...1 8W 2 7K 1 AT R906 4701 103J 2 RCF 1 8W 10K 5 AT R912 4701 101J 2 RCF 1 8W 100R 5 AT R915 4701 103J 2 RCF 1 8W 10K 5 AT R927 4701 103J 2 RCF 1 8W 10K 5 AT R944 4701 104J 2 RCF 1 8W 100K 5 AT R945 470...

Page 29: ...05 563J C RCF 1 4W 56K 5 ATS R975 CA 4705 243J C RCF 1 4W 24K 5 ATS R959 R960 EU 4701 274J 2 RCF 1 8W 270K 5 AT R959 R960 CA 4705 124J C RCF 1 4W 120K 5 ATS IC U201 3132 3561 0 IC MCU 16K FLASH P89 U2...

Page 30: ...2 C103 157T 475M 5 S5T CE 400V 4 7U 20 RL C104 8910 0091 0 CC 400V 0 01UF 20 RL C105 157D 106M K IUE CE 16V 10U 20 RLT 5X11 C106 157Q 476M K LUTU CE 35V 47U 20 RLT C107 C110 157D 477M K OVE CE 16V 470...

Page 31: ...R102 4718 104J 2 RMF 1W 100K 5 AT R103 4715 152A 2 RMF 1 4W 1 5K 1 AT R106 4711 203A 2 RMF 1 8W 20K 1 AT R108 EU 4717 335J 2 S1 RMF 1 2W 3 3M 5 AT R301 4701 101J 2 RCF 1 8W 100R 5 AT R104 4705 102J C...

Page 32: ...32 EXPLODED VIEW X2 15 14 13 X5 X4 11 4 X10 26 3 X10 1 2 30 X4 27 28 24 X2 25 9 10 24 23 5 29 7 6 X4 12 22 21 X5 19 X4 20 18 16 17 30 14X2 8 31...

Page 33: ...402 3534 0 COVER TOP SECC BLACK 1 1402 3532 0 TOP COVER SILVER 1 18 2900 4006 2010 M4X6 TITANNIUM VERSION 4 2900 4006 3010 M4X6 GREY VERSION 4 19 2954 3010 4000 SCREW M3X10 TITANNIUM VERSION 1 2954 30...

Page 34: ...0021 0 CD MANUAL 1 5 1497 7492 0 POLYBAG 600X600X0 04MM 1 6 4201 0010 0 NON WOVEN CLOTH BAG 1 7 2107 0661 1 300 OHM T ANTENNA 1 8 2107 1131 0 NMA 3057 AM LOOP ANTENNA 1 9 4060 0530 0 GREENCELL 3A SIZ...

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