NAD C 720BEE, Service Manual

Page 1: ...NAD SERVICE MANUAL C 720BEE STEREO RECEIVER C 720BEE STEREO RECEIVER ...

Page 2: ...VIEW 4 SPECIFICATIONS 5 7 ALIGNMENT PROCEDURE 6 7 WIRING DIAGRAM 8 BLOCK DIAGRAM 9 15 ALIGNMENT PROCEDURE 16 SCHEMATICS 17 20 PCB LAYOUT 21 24 SPECIAL FUNCTION TROUBLE SHOOTING GUIDE 25 ELECTRICAL PARTS LIST 26 34 EXPLODED VIEW 35 EXPLODED VIEW PARTS LIST 36 2 PROTECT IC CHANGE 37 ...

Page 3: ...arts including Metal panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical Es devices are integrated circuits and some field effect transistors and semiconductor chip components The following tec...

Page 4: ...C OUTLET 5 AC LINE CORD 6 VACATION SWITCH ON OFF 7 SOFT CLIPPING 8 SUBW OUT 9 MAIN IN 10 PRE OUT 11 RECORD OUT ZONE 2 12 TAPE IN 13 AUX INPUT 14 VIDEO INPUT 15 CD INPUT 16 DISC INPUT 17 IR INPUT OUTPUT 18 12V TRIGGER OUT FRONT PANEL REAR PANEL 4 ...

Page 5: ...t term power per channel 4ohms 160W 2ohms 210W Damping factor ı100 Slew factor ı50 Slew rate ı20V ȝsec T H D and SMPTE I M İ0 03 Distortion from 250mW to rated output IHF I M CCIF IM and T I M distortion İ0 03 From 250mW to rated output Input impedance 22kȍ 470pF Input sensitivity For 50 Watts out ı700mV Power amp gain 29dB Preamplifier Section Input Impedance 22kȍ 100pF SPECIFICATIONS NAD C720BEE...

Page 6: ...B OUT 50Hz İ3dB at 100Hz Outputs Preamp output impedance 80ȍ Zone2 output impedance Source Z 600ȍ Controls Treble 5dB at 10kHz Bass 8dB at 100Hz Pre in Power AMP out input 2V Signal to Noise ratio A weighted 98dB ref 1 W out 500mV CD in SPK out 8ȍ A weighted Rated distortion THD 20Hz 20kHz İ0 03 Input sensitivity 225mV CD in SPK out at rated power volume max Channel Separation ı70dB CD in 20W out ...

Page 7: ...noise ratio Mono 60dBu ı60 dB Frequency response 50Hz 15kHz 3dB Stereo separation 1kHz 60dBu ı35 dB Usable sensitivity at S N 20dB İ60 dBȝ THD 74dBu input 30 mod İ3 1 signal Selectivity at usable sen ı20 dB Image rejection at usable sen ı28 dB I F rejection at usable sen ı40 dB S N ratio 30 mod 80dBu input ı40 dB Physical Specifications Width Height Depth 435x133x350mm Net Weight 8 7kg Shipping We...

Page 8: ...mm CB31 PCB 3 KEY BOARD FPC 1 25 19P 710mm 18 9 WHITE CB33 CZ34 Insert UL2468 AWG 26 WHITE 400mm PCB 8 IN MODULE BOARD CB61 UL1672 AWG 18 UL1672 AWG 22 150mm CB49 CB47 CB45 RED 100mm PCB 9 MUTE BOARD CB34 CB34 CB32 Insert Insert WIRING DIAGRAM CB59 PCB 1 MAIN BOARD FPC 1 25 17P 180mm TUNER MODULE KST MB114MA0 1 23 CZ35 WHITE 500mm UL2468 AWG 26 CON 01 CZ36 CZ37 WHITE WB01HS 001 C UL1672 AWG 18 CB5...

Page 9: ... CONTROL CIRCUIT S41 POWER AMP CIRCUIT L CIRCUIT R POWER AMP IC 33 CD4094 PROTECTION CIRCUIT IC44 UPC1237HA SPK B SPK A 4 5 7 Q416 Q417 C1815 C1815 SPKA R SPKB L SPKA L SPKB R RL12 1 JQX 115F 0242HS4AF RL12 2 JQX 115F 0242HS4AF CPU ISC CIRCUIT IC43 TL082D TRIG I V MIRROR SOURCE SCR CIRCUIT 2 3 4 5 7 8 21 22 24 25 26 27 13 15 16 1 2 3 4 5 6 7 13 14 11 12 VOL VOL VOLUME CONTROL CIRCUIT REMOTE MUTE C...

Page 10: ...ST DATA CLK IC703 UPD16311 5V 30V CLK 9 5 6 8 STB DIN DOUT ENCODER CONTROL CIRCUIT 10k 2k 470 Q712 5V Sandby control line 24C64 18V Power Supply Circuit STR D CLK IC707 4094 STR D CLK IC32 4094 STR D CLK IC33 4094 1 2 3 1 2 3 1 2 3 DATA CLK ST2 ST ST2 ST ST CLK CLK CLK DATA DATA 10K 10K 10K 10K 10K 10K 10K 10K 5V RDS DATA PLL CE PLL D0 PLL D1 PLL CLK1 TUNER STEREO 1 2 3 4 5 6 7 8 9 KST MB114MA0 1 ...

Page 11: ...PIN CONFIGURATION 1 2 3 4 5 6 7 8 VCC WP SCL SDA GND A0 A1 A2 PIN NAME A0 A2 SDA SCL WP ADDRESS INPUTS FUNCTION SERIAL DATA SERIAL CLOCK INPUT WRITE PROTECT WP Vcc GND SCL SDA A0 A1 A2 START STOP LOGIC LOAD SERIAL CONTROL LOGIC EN H V PUMP TIMING DATA RECOVERY X DEC EEPROM SERIAL MUX Dout ACK LOGIC Dout Din Y DEC DATA WORD ADRR COUNTER INC LOAD COMP R W DEVICE ADRRESS COMPARATOR ICS BLOCK DIAGRAM ...

Page 12: ...RST RXD P3 0 TXD P3 1 INT0 P3 2 INT1 P3 3 T1 P3 5 T0 P3 4 WR P3 6 RD P3 7 XTAL1 XTAL2 GND AT89C55WD KEY BOARD IC704 PIN CONFIGURATION OSC WATCH DOG PORT 1 LATCH LATCH LATCH LATCH PORT 0 PORT 2 PORT 0 DRIVERS PORT 1 DRIVERS PORT 2 DRIVERS PORT 3 DRIVERS QUICK FLASH RAM RAM ADDR REGISTER REGISTER B ACC STACK PIONTER PROGRAM ADDRESS REGISTER BUFFER PC INCREMENTER PROGRAM COUNTER DUAL DPTR INTERRUPT S...

Page 13: ... 5 6 7 12 13 14 LATCH 2 3 STATE 2 CLOCK STROBE CL CL TR TR OUTPUT ENABLE 15 TR TR LATCH 1 p n n VDD VSS Q1 Q2 Q3 Q4 Q5 Q6 Q7 3 STSTE 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 STROBE DATA CLK Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 QS Q S VSS VDD OUTPUT ENABLE PIN CONFIGURATION TL082CP D MAIN BOARD IC3 IC4 IC34 IC43 A B 1 2 3 4 5 6 7 8 V OUTPUT B INVERTING INPUT B NON INVERTING INPUT B V NON INVERTING INPUT A INVER...

Page 14: ...4 L5 L6 L7 L8 R1 R2 R3 R4 R5 R6 R7 R8 Vee L COM1 L COM2 L COM3 R COM1 R COM2 R COM3 DATA CLK Vss ST PIN CONFIGURATION Level Shifter Latch Circuit Latch Circuit Level Shifter Control Circuit R1 R2 R3 R4 R5 R6 R7 R8 L1 L2 L3 L4 L5 L6 L7 L8 L COM 1 L COM 2 L COM 3 R COM 1 R COM 2 R COM 3 DATA CLK Vss Vee Vdd ST 14 ...

Page 15: ...5V Vss 0V Vee 30V uPD16311 MAIN BOARD IC703 PIN CONFIGURATION Top View 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Seg1 KS1 Seg2 KS2 Seg3 KS3 Seg4 KS4 Seg5 KS5 Seg6 KS6 Seg7 KS7 Seg8 KS8 Seg9 KS9 Seg10 KS10 Seg11KS11 Seg12KS12 Vdd SW1 SW2 SW3 SW4 Dout Din IC CLK STB KEY1 KEY2 KEY3 KEY4 Grid6 Grid...

Page 16: ... the 5 Adjusting VR302 make R channel output become to the lowest level by same way B IDLING CURRENT 1 Connect a DC voltmeter toTP1 and TP2 adjust VR22 for 4 5mV reading on voltmeter 2 Connect a DC voltmeter toTP3 and TP4 adjust VR12 for 4 5mV reading on voltmeter 3 Level power on for a minimum of 5 minutes II FINAL ADJUSTMENT Repeat procedure A and B for lowest volume level and idling current ali...

Page 17: ...5 C1815 Q36 C1815 Q37 C1815 R369 4K7 R371 4K7 R373 4K7 R375 4K7 R377 4K7 C351 10n C352 10n C353 10n C354 10n CD SEL DISC SEL TAPE SEL AUX SEL TURNER SEL DISC TAPE AUX FM AM R378 4K7 R376 4K7 R374 4K7 R372 4K7 R370 4K7 Q38 C1815 R379 4K7 R380 4K7 VIDEO STR 1 D 2 CLK 3 Q1 4 Q2 5 Q3 6 Q4 7 VSS 8 QS 9 QS 10 Q8 11 Q7 12 Q6 13 Q5 14 OE 15 VCC 16 IC33 4094 STR 1 D 2 CLK 3 Q1 4 Q2 5 Q3 6 Q4 7 VSS 8 QS 9 Q...

Page 18: ... 1 2 3 4 5 6 7 8 IC44 UPC1237HA D42 1N4148 D43 1N4148 R437 47K STANDBY R440 2K2 18V R478 100K 1 2 3 IC43A TL082D R480 6K2 R482 4K7 R479 100K C428 10u 25V C425 10u 25V R470 10K R471 10K D418 1N4148 D417 1N4148 R477 47K R483 330K R473 47K R472 470K C426 10u 25V C429 10u 25V R488 39K R487 39K R486 560K R474 1K C430 10u 25V R476 1K C431 10u 25V R490 100K R491 100K 4 5 6 7 8 IC43B TL082D 18V 18V 18V IS...

Page 19: ... L2 G GND GND 46V 46V 37V 37V I V AC DET TRIG NAD C720BEE POWER CIR 10 10 D501 DB104 C533 4700uF 16V C536 100uF 1 2 3 CB56 1 2 3 CZ56 F55 500mA 250V 6 3A 250V X4 RED GRAY BLACK ORANGE PURPLE 1 3 CB57 1 3 CZ57 1 2 3 4 5 CB51 1 2 3 4 5 6 7 CB52 1 2 3 4 5 6 7 CZ52 1 2 3 4 5 CZ51 1 2 3 CB58 1 2 3 CZ58 1 1 2 2 AC OUTLET 36 4V 36 4V 0V 28 5V 28 5V 8V 0V R567 10K C53 330u 50V C55 10uF 50V Q58 KSA1220 D53...

Page 20: ...48 5 R748 8 10K IP SEL ST R749 10K IP SEL ST2 RDS CLK S715 ON Standby S716 DISC S717 CD S718 TAPE S711 AUX S712 FM S713 AM S714 SpeakerA S707 SpeakerB S708 Preset down S709 Preset up S710 Tune down S703 Tune up S704 Display S705 Memory S706 Blend S701 FM Mute Mode S702 video P1 P2 P3 P4 P5 D705 1N4148 D704 1N4148 D703 1N4148 D702 1N4148 D701 1N4148 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 CZ70...

Page 21: ...6 Q43 Q41 R410 R49 C45 J176 C46 Q44 C48 C414 R412 J173 R414 R48 H2 R441 C12 1 IC44 C420J147 C421 R12 1 R12 2 D423 R435 C432C422 R442 C413 C47 R411 D49 R413 J178 R401 R47 R45 J179 J181 R436 Q421 R489 Q411 J146 R451 R448 J144 R382 H1 R457 R381 Q39 J145 C434 R427 C443 J182 J180 H3 R428 Q414 R429 Q42 Q416 Q413 Q417 J174 Q401 R454 R493 R449 R455 R494 R450 J202 R362 C360 R340 C348 C340 Q310 C361 J201 J2...

Page 22: ...ACK T500MAL 250V D501 C533 C53 D54 F55 T6 3AL 250V T6 3AL 250V U T6 3AL 250V C52 F53 R563 R558 D532 D55 J55 Q517 R561 J54 F51 F52 J57 J58 D531 D51 BLUE C51 BLUEC 536 R562 5V R532 R531 IC51 C54 J52 R534 J59 Q59 R533 Q510 CB54 CB53 J511 J512 U GND GND GND J510 30V I V ACDET 37V 5V 37V TRIG J56 GND C517 D56 C56 C535 ToThe AC Outlet CB55 To The ACcord D513 J515 J513 VFD 1 VFD 2 C524 C523 J516 To The T...

Page 23: ...COPYRIGHT C 2004 NAD ELECTRONIC R613 Q65 Q68 R618 Q62 R616 Q66 R614 D64 C62 R612 C64 C63 D63 D61 C61 Q61 C66C68 C65 C67 J61 D62 Q67 R611 Q63 R617 Q64 R748 S 7 1 6 STEREO S702 S717 C62 C64 R612 D63 C61 C63 D61 C66 D64 C65 J61 C68 C67 D62 Q67 Q63 R611 R617 R615 Q64 R613 J751 J735 S713 S718 J736 J737 NAD J732 J733 S 7 1 2 PCB 5 POT BOARD FOR Vm5 0 NAD CB31 NAD C720BEE NAD ELECTRONIC POT BOARD Vm5 0 C...

Page 24: ...EW PCB 9 MUTE BOARD D319 R318 C317 Q312 D316 Q311 D317 R317 R348 Q32 D318 R347 Q31 R335 JK41 R744 R745 R746 IC703 R741 R747 R704 R703 R701 R702 C703 C363 C364 C344 C343 NAD C720BEE MUTE BOARD Vm5 0 COPYRIGHT C 2004 NAD ELECTRONIC PCB 9 MUTE BOARD R390 TOP VIEW R389 R339 R338 NAD C720BEE VFD BOARD Vm5 0 CZ703 NAD ELECTRONIC COPYRIGHT C 2004 10 1 NAD IC701 18 9 PCB 3 KEY BOARD TOP VIEW ...

Page 25: ...ES NO CHECK THE POWER AMP CIRCUIT SECTION IS THE MUTE SIGNAL OFF YES CHECK THE MUTE CONTROL CIRCUIT IC32 7 NO IS THE SELECTED INPUT RELAY ON NO YES CHECK THE CONTROL CIRCUIT IC33 4 5 6 7 13 14 CHECK THE PRE AMP CIRCUIT IS THE VOLUME CONTROL CIRCUIT NORMAL NOTE THE IN OUT MODULES CHECK THE VOLUME CONTROL CIRCUIT IS THE POWER SUPPLY LOWER THAN THE LOWERST WORK VOLTAGE NO CHECK THE POWER SUPPLY IS TH...

Page 26: ...2 Q25 Q102 Q104 Q202 Q204 31 00970 00 2SA970 GR Q13 Q14 Q23 Q24 Q101 Q103 Q201 Q203 31 02240 00 2SC2240 GR Q18 Q28 31 00647 00 2SB647A Q19 Q29 31 00667 00 2SD667A Q110 Q113 Q210 Q213 Q42 31 01220 00 KSA1220 Q111 Q112 Q211 Q212 Q116 Q216 Q41 Q413 31 02690 00 KSC2690 Q310 31 00363 00 2SK363 CAPACITORS C18 C19 C28 C29 C45 C46 05 22012 00 22p 100V 10 C360 05 10112 01 100p 100V 10 C302 C303 C361 05 221...

Page 27: ... 22161 00 220u 63V 20 C43 C44 06 22151 00 220u 50V 20 C413 C414 06 22131 00 220u 35V 20 C422 06 33111 01 330u 16V 20 C116 C216 06 22260 01 2200u 6 3V 20 RESISTORS R385 R386 07 10189 00 1 8 5 1 6w R154 R155 R254 R255 07 10100 10 10 5 1 4w R2 07 10100 00 10 5 1 6w RI3 07 10330 00 33 5 1 6w R115 R116 R215 R216 07 10330 10 33 5 1 4w R14 R24 R416 R417 R418 R419 07 10101 10 100 5 1 4w R363 RI6 07 10101 ...

Page 28: ...243 07 20220 10 22 5 1 4w R107 R108 R207 R208 07 20390 10 39 5 1 4w R103 R106 R111 R112 R120 R203 R206 R211 R212 R220 R219 R119 07 20820 10 82 5 1 4w R149 R249 07 21600 10 160 1 1 4w R327 R328 07 20181 10 180 5 1 4w R325 R326 R331 R332 07 23900 10 390 1 1 4w R383 R384 07 25600 01 560 2 1 6w R323 R324 07 27500 10 750 1 1 4w R329ˈR330 07 21501 10 1 5K 1 1 4w R321 R322 07 23301 10 3 3K 1 1 4w R359 R3...

Page 29: ...508 00 XHB 2 5A 8A CZ36 13 21217 00 FPC1 25 17PIN CZ35 13 21219 00 FPC1 25 19PIN 17 02002 00 SCJ351P00XS0B00 17 02002 01 ST 5037B 04 17 02001 03 SCJ349P00XS0B01 17 02001 04 ST 323B 04 RCA31 RCA32 RCA33 RCA34 17 01004 05 4 holes red and white gilt RCA35 17 01001 11 1 hole red AV 8 4 14 gilt CB715 02 03005 20 C version CB715 02 03005 10 AH version LINKS J7 J8 J9 J19 J20 J29 J30 J35 J37 J53 J62 J64 J...

Page 30: ...289 21 10101 00 L 10mm J1 J23 J24 J25 J26 J27 J28 J31 J32 J44 J56 J144 J145 J149 J150 J174 J181 J185 J186 J188 J194 J195 J224 J267 J286 J287 21 06121 01 L 12 5mm J2 J16 J17 J18 J54 J63 J74 J75 J76 J77 J78 J79 J80 J81 J82 J83 J84 J96 J97 J110 J112 J113 J139 J156 J171 J198 J226 J227 J245 21 06151 00 L 15mm J5 J88 21 10151 00 L 15mm J57 J111 J138 J151 J152 J153 J154 J155 J234 J259 J261 J279 J280 21 0...

Page 31: ... 33 44148 11 LL4148 RESISTORS R335 R336 07 90680 01 68 5 R317 R318 07 90471 01 470 5 R333 R334 07 90472 01 4 7K 5 R347 R348 R391 R392 07 90104 01 100K 5 R338 R339 R389 R390 07 90106 01 10M 5 CAPACITORS C317 C318 26 10151 01 100pF 50V 5 CONNECTER CB34 13 12510 01 10PIN glit CIRCUIT NO PART NO DESCRIPTION ICS IC51 03 01117 01 AMS1117 5 0 LM1117MPX 5 0 TRANSISTORS Q59 Q510 Q517 Q519 31 01015 00 2SA10...

Page 32: ...6750 00 L 7 5mm J57 21 10750 00 L 7 5mm J59 J510 21 06101 00 L 10mm J55 J511 21 10101 00 L 10mm J54 J58 21 10121 00 L 12mm J51 21 06151 00 L 15mm J56 21 10201 00 L 20mm J512 21 10251 00 L 25mm CIRCUIT NO PARTS NO DESCRIPTION ICS IC704 03 08955 12 AT89C55WD 24PC 24PI IC704 13 22540 00 DIP 40 IC707 03 04094 00 CD4094 HEF4094 IC702 03 00038 40 HS0038B4 IC706 37 12122 00 EC12E1220801 F20 IC705 03 0246...

Page 33: ...710 S711 S712 S713 S714 S715 S716 S717 S718 S719 11 04101 00 Selector CONNECTERS CZ702 13 21219 00 19PIN CZ701 13 22508 00 XHB 2 5A 8A LINKS J701 J735 J740 J742 J755 21 06500 00 L 5mm J702 J703 J704 J705 J712 J727 J728 J730 J731 J733 J734 J738 J754 21 06750 00 L 7 5mm J713 J722 J732 J736 J737 J739 J750 21 06101 00 L 10mm J706 J707 J708 J753 21 06121 00 L 12mm J741 J743 J744 J745 J751 21 06151 00 L...

Page 34: ...72 RED 100mm CB56 POWER SWITCH 14 72002 02 VH 3 96A 3Y KST FDFD2 187 8 18AWG UL1672 RED 130mm CB49 CB54 14 72004 00 VH 3 96A 4Y 22AWG UL1672 150mm CZ37 CZ701 14 72008 10 XHB 2 5A 8Y 26AWG UL2468 WHITE 500mm CZ36 TUNER 14 72017 10 FPC 17PIN 180mm CZ35 CZ702 14 72019 00 FPC 19PIN 710mm AC CORD C 15 02251 20 WB01HS 001 AC CORD AH 15 10121 10 WB05HS 001 AC Outlet 17 07002 20 A302 D006 0P AC Outlet 17 ...

Page 35: ...21 F022 F031 F030 F026 F028 C001 S007 S006 S005 S006 S006 S007 S009 S002 S002 S011 S006 S010 S006 S001 S008 S004 S004 S002 C002 C010 C003 C004 C005 C006 C007 C008 C009 S015 S014 S016 S015 S014 S016 T001 C012 C011 C013 C014 R001 R002 R004 R003 R006 R005 C015 C016 S007 S006 S001 C015 S006 S006 S006 C017 C018 R007 S013 S012 EXPLODED VIEW 35 ...

Page 36: ...47005 0 End Cap L 1 T001 67 047001 0 Top cover 1 F003 67 047006 0 End Cap R 1 F004 66 047002 1 Subfascia 1 S001 61 023206 0 Self Taping Screws BTB3X6 4 F005 75 047003 0 Input Button Lozenge 1 S002 61 023208 0 Self Taping Screws BTB3X8 12 F006 77 001001 1 Tone Control Lozenge 1 C 14 F007 75 047001 1 Selector Knob 1 S003 61 022205 0 Self Taping Screws BTB2X5 8 F008 74 001001 1 Tone Defeat Button 1 S...

Page 37: ...0k R21 220k Q18 2SC1815GR Q12 2SA1015GR R17 100k D12 1N4148 R18 100k R14 22k C10 1N D13 4 7V C11 100N Protect Module Q19 2SC1815 R23 56K R26 10k C12 0 22UF R27 10k R28 10k This Protect Module replaces Protection IC 44 Remove the part below R442 Remove 56K Ohm resistor Replace and change orientation for the part below C421 From 4 7uF 50V to 0 47uF 50V Reverse mount the new C421 Change orientation f...

Page 38: ...SERVICE MANUAL NAD 2005 C 720BEE STEREO RECEIVER NAD ELECTRONICS LTD TORONTO ...