NAD 300, Service Manual

Page 1: ... tRUIET lllr ilufll Z ftCC STEREO RECEIVER t t J xrr aj i1 i r n 1r rLr qi rnt4 r t rt t r SS S Y mm Smp q w_ I tr irlilJ ...

Page 2: ...BLESHOOTI NG TUNER FRONT END OO36TUNERBOARD 2O 5027 PRE AMPLIFIER BOARD 21 6038 MAIN AMPLIFIER BOARD 7105 SWITCH BOARD 7110 DOLBY NR BOARD 7118 DOLBY FM CALIBRATION BOARD BO25 POWER SUPPLY BOARD 25 9025 TONE AMPLIFIEB BOARD 26 ELECTRICAL PARTS LIST 27 36 M ISCE LLAN EOUS PARTS LIST PAGE 3 6 7 I 12 13 18 19 22 23 24 25 37 38 39 BLOCK DIAGRAM INTERNAL VIEW OF INTEGRATED CIRCUIT SCHEMATIC DIAGRAM SEP...

Page 3: ...pV 12 Signal to Noise Ratio 100 Mod 1 mV lnput 13 Capture Ratio 1 000 prV MONO lnput 14 Output Voltage Stereo and Mono 4OO H2 100 Mod TAPE 2 OUT 15 Alternate Channel Selectivity lH F Antenna lnput 100 pV 16 Muting Threshold B FM MPX SECTION 1 Stereo Separation at 98 MHz Antenna lnput 1 000 pV 100 Hz 1 kHz 10 kHz Hl BLEND on at 1 kHz 2 Total Harmonic Distortion at 98 MHz Stereo 1 mV Antenna lnput 1...

Page 4: ...ut 4OO H2 30 Mod at REC OUT 8 Dial Calibration Accuracy 600 kHz 1 000 kHz 1 400 kHz 9 Output Voltage 1 kHz 30 Mod 5 mV m lnput at TAPE 2 OUT 10 Signal to Noise Ratio 400 Hz 30 Mod 50 mV m lnPut D AUDIO SECTION 1 Output Power 0 3 THD 2O Hz 20 kHz B ohms Load Both Channels Driven 2 Harmonic Distortion at 1 kHz 8 ohms Load 65Watts OutPut 3 lntermodulation Distortion at2Y Output 4 ohms Load 4 Frequenc...

Page 5: ... 17 Harmonic Distortion of Pre Amplifier Section 20 Hz 20 k z 2 Volt Output 50 Kohms Load 18 lnput Sensitivity of Pre Amplifier Section at 1 kHz for 25 3 Volts Output 8 ohms Load E DOLBY NR SECTION 1 Output vs lnput at R EC Position at2k1z 0 dB 30 mV lnput Level 0 dB 20 dB _ 3 3B 2 Output vs lnput at PLAY Position at 5 kHz 0 dB 30 mV lnput Level 0 dB 20 dB 30 dB 3 Frequency Response of DOLBY FM ln...

Page 6: ...LIMIT NOMINAL F GENERAL 1 Power Requirements 22OVAC 50 Hz 12O 24O VAC 50 Hz 2 Dimensions 508 W x 400 D x 145 H mm 3 Weisht 22 Ks ...

Page 7: ...el Refer to Figure A a Pull off all the control knobs except for PLAY CAL and REC LEVEL b Remove three nuts from SELECTOR SPEAKERS and DOLBY NR controls c Remove three screws from top of the Front Panel and remove Front Panel Note Numbers shown in circles correspond to Miscellaneous Parts List on Page 37 Figure A V PIJLLEY DIAL DRUM 2 TURNS 6l Y6 l e t r i 3 DIAL STRINGING DETAIL PULLEY Note Tunin...

Page 8: ...CK POINTS N o r E _o o F E o O F E O CD E o C l F U ca O co E c 8 I ei r l a C ff f 0 _o O o E _o N O 0 E O J r O E LO J O l LL O c F F Ju ii cD l N rN CD S ij o oo oo o o o F rf SiJi c o r I I F F F FF F gO Nr OO o o EE ...

Page 9: ...ICATOR AC Voltmeter to TAPE OUT jack ADJUSTMENT REMARKS 1 Point of non i nterference on about 600 kHz T401 RF Coil Both sections CF4O1 Adjust for maximum reading 2 Same as Step 1 600 kHz 400 Hz Mod 600 kHz Same as step 1 1401 OSC Coil L451 ANT Coil Adjust for maximum read i ng 3 Same as Step 1 1400 kHz 400 Hz Mod 1400 kHz Same as step 1 TC107 OSC Trimmer TC105 ANT Trimmer TC106 RF Trimmer Adjust f...

Page 10: ...RF Trimmer Adjust for maximum reading Repeat steps 1 2 until no further improvement is possible T101 FM IFT Same as Step 1 DC Voltmeter connect between BASE of TR305 and Ground T2O1 TOP DISCRIMI NATOR Adjust for maximum reading 90 MHz 4OO Hz Mod Same as Step 1 Adjust for 0V on DC Voltmeter 90 MHz 400 Hz Mod Same as Step 1 Adjust for minimum distortion r o3o 1il a oo uu Distortion Meter connected t...

Page 11: ...OUTPUT INDICATOR Connected to ADJUST MENT ADJUST FOR NOTE 1 PI LOT OFF Stereo Modulator Sub Signal Frequency counter connect to 12 PIN on 1C301 VR301 19 kHz 2 Bo o Composite 1 kHz R channel SG output level 5 pV Stereo beacon lamp V R3O2 Just turns ON Adjust so TR311 turns ON with SG output level of SpV 3 B Composite 1 kHz R channel AC Voltmeter to TAPE OUT jack of R channel Adjust input for audio ...

Page 12: ...tomatically The protectors of heat sinks have the same effect as above except for working temperature When their temperature rises up to 115t5 C these protectors will be automatically cut out and as soon as the temperature falls down to 40t19 9 these protectors turn back on automatically STEP ADJUSTMENT INDICATOR REMARKS 1 VR601a b Bias control DC Voltmeter Adjust for 0 025V across R629a b or R630...

Page 13: ...0V Remove the orange wire from pin 1 and the white wire from pin 3 of terminal strip then connect the orange wire to pin 4 of terminal strip and the white wire to lug of fuseholder alredy connected gray wire Also remove the white wire to pin 2 of terminal strip and connect the white wire to pin 3 of terminal strip WARN ING lf the power transformer connections are not set for the correct local volt...

Page 14: ...ed transistor Diode D803 or D804 damaged Replace the damaged diode A B c D A B c D E 2l Pilot lamp lights but no sound from both channels 3 A Speakers do not worl A Speaker switch S17 defective Replace the switch 4l B Speakers do not work A Speaker switch S17 defective Replace the switch One channel does not work with VOLUME at maximum with a test signal applied to the center terminal of VOLUME co...

Page 15: ...in AUX input jack Repair or replace the jack B Poor contact in selector switch S1 9 PHONO input not operative A Poor contact in PHONO input jack Repair or replace the jack B Faulty selector switch S1 Repair or replace the switch 10 TAPE OUT not operative A Defective contact in TAPE OUT jack Repair or replace the jack 1 1 FM does not operate A Defective diode D833 Replace the diode Transistor TR831...

Page 16: ...or lamp does not light A Defective indicator lamP PL9 Replace the lamP lmproper adjustment of VR301 and VR302 of 0036 TUNER BOARD Make readjustment Refer to MPX ALIGNMENT on page 1 1 Defective lC3O1 or R835 of 0036 TUNER BOARD Rep lace defective comPonent lf volume both L and R channels not enough Front End defective or faulty IFT T201 or diode D207 D2OB of 0036 TUNER BOARD or faulty C313 lC3O1 or...

Page 17: ...ne Amplifier Board Replace defective component 2Ol TREBLE control has no effect A VR901 defective Replace B Defective C904 R908 or R909 of 9025 Tone Amplifier Board Replace the defective component 21l Excessive noise with PHONO MAG input A Faulty TR501 TR502 TR503 or TR504 Replace the faulty transistor B Faulty R501 R503 R506 C501 or C505 Replace the faulty component 22 Noisy VOLUME control A Defe...

Page 18: ...place the switch 251 OUADRO not effective A Defective switch 57 Replace the switch B Defective capacitor C752 C753 or C754 Replace the defective caPacitor 26 t SUBSONIC filter has no effect A Defective switch S8 Replace the switch B Defective C755 C756 TR751 or TR752 Replace the defective comPonent 271 High Filter has no effect DOLBY NR switch 54 defective Repair or rePlace the switch lC 1C701 def...

Page 19: ...8 TUNER FRONT END EA RTll GOT A TART1l OUT OUT A 1 T lOT OUT It OUT 19 ...

Page 20: ...fiEH s P ffi 1r fr l 11 1 E c r Gl 6 fiil Y oy jE LI V Yr PC3OC 40 1 Jl tl c 4 Y s1 fft 001 Oae H a U I l t l t i A 11 h t l V lE I Fq p t7 _ l 1 _nlE U q ts _ A L NH Vp f v zl 1 l lEl e l l l V J V AU i _l l l I I 9lE E1 I lr F lr l I 91 l lr IE AA l t l ll WZ Its tt al 11 l 2 A lt h n I il llEl V t il l _A l ll_ xg r l U l 2 31 r er c I n t s l _lc Ie 20 ...

Page 21: ... f yr_g G66 l ll I l I t l t r r V rm Iri 1 Z fag E l CSffit A r P mil r d l u tt X 6DQ Z X EO _ t ii Y Y E E iot tr v l I5 r r U ffiu P1Q n5lia t502 n _g _Y 9 ry l l O O C O Q Q Q L l G C e O e O O r r e O e O O O D 9 Qx e5 5Bx v G o c o ffi e e e e c c e o e e e o r a t r _ F r P 21 ...

Page 22: ... d6fl e f U m ZrX sO Usi _ tD Hl il L f lU 1r r u r tj fljnuP Y JF tJ ffi1b 5 6 _ r ur9 L _ _ J ffij 1 y yAs Ay c nrriE E U EBT O II a u 6 ilx QoA 6 GD ccGE v uF ll V r iiiE ffiry 3 5 1t u O O C O Q Q r P O e ffi c e e Gp o c o c o c o e o c e o 21 ...

Page 23: ...11 6038 MAIN AMPLIFIER BOARD o 630 0 82 i 1 o bot lut c 4o rz eLoz bc str t kt yf 22 ...

Page 24: ...12 7105 SWITCH BOARD l 1 i f r m c3 rr rr r 1 nE re f I r 1 r 1 trfH m E r 1 r r r 1 r 1 t l re nrrtr T EE m r 1 r 1 E 23 ...

Page 25: ...13 7110 DOLBY NR BOARD o o Q o n 6 o o L9 r v g o ra mr5 tl g __ s E EOGr0 6 E4 rffil F o rr r ryE7 o_ nl22 3lt 24 ...

Page 26: ...S qr_ ffi ft t A Yffi o u6 6 6 6 o b 6 ooooo 1 r 806 s 5t5l 1 i 1r z t a fl822 4 l m m l q R82lrr p r J lcan I r0050v J rR8lr SUt3 6 q norrrrn p c807 Tia08 rst3 5 r T r i uul F caor I ron5fl l fll 1 l 4 1 tr rRBBS rxnl18 rr fi r qJryu r illl _F ty J Ti ffi soi o __ l 17 oo II 85 P 4 I 1306Y I rx30 lscg s r 1 FB 60 T I 1r1 P ffi nc TJ r q ry P tol 13r6Y Rp f I cl R8ilrrl50 F l J_ rJ a n Q r11 sl 25...

Page 27: ...16 9025 TONE AMPLIFIER BOARD 1 e t rrffillG flu HM E Br 3 l co4r l uoso ffit3Lv lz RSllb _ mrTh r 170r 1l 5t tl Rgl6 v n9l5 l00l a 151 920i 3301 uRg0t 100t Bx2 ItR902 l00l x2 26 ...

Page 28: ...ctrolytic Polyester Electrolytic Electrolytic Ceramic Electrolytic Ceramic Ceramic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Polypropylene Electrolytic Ceramic Electrolytic Ceramic Electrolytic Ceramic c201 c202 c203 c204 c205 c206 c207 c208 c209 c210 c211 c212 c213 c214 c215 c21 6 c217 c218 c219 c220 ...

Page 29: ...6 50 6 Ceramic t Ceramic Electrolytic Polyester Ele ctrolytic Ceramic Electrolytic Polyester Electrolytic Polyester Electrolytic Tantalume Electrolytic Electrolytic Polyester Electrolytic Electrolytic Polyester Electrolytic Ceramic Polyester Electrolytic Polyester Electrolytic t 1 Electrolytic C901 a b C902a b C903a b C904a b C905a b C906a b C907a b C908a b C909a b C910a b c91 1 cB04 CBOS c806 c80...

Page 30: ... I oees rTT410 1 N6 P 1 S2473 1 N6OP 1 52473 1 N6 P R D6 2 E 1 S2473 STV 3H 1 N60 1 S2473 SR 1 K2 RD l8E s51 51 B s51 51 SR 1K2 SR 1K2 RDl3E UNISON Toyo Electronics UNISON Toyo Electronics UNISON NEC Toyo Electronics Sanken UNISON Toyo Electronics UNISON NEC Toshiba UNISON UNISON NEC 3060001 1 3060041 0 3060001 1 3060041 0 3060001 1 3060069 1 306004 1 0 3060088 1 3060001 0 3060041 0 30600540 30600...

Page 31: ...NETICS RELAYS Ref No Description Mfr s Part No K1a b K2a b A Speakers Protection Relay B Speakers Protection Relay 82000040 82000040 COILS L201 L202 1203 130 1 1401 1451 160 1 a b L70 1 a b lnductor LT 8330M lnductor 144HY 102K 0SC Coil415L AM Bar Antenna Coil Choke Coil lnductor 1 1mH Mfr s Part No 35500090 355001 50 35504 1 56 35400441 355001 70 35500270 Description FILTERS I Ref No I I I Descri...

Page 32: ...39 R340 R34t R342 R343 R344 R345 R346 R347 R348 R349 68K 120 10K 47K 39K 100 K 180 K 1K 68K 10K 1 00K 750 10K 3 9 K 4 7 100 K 3 3K 22K 68K 220K 100 K 100 56K 10K 220K 2tK 10K 22K 1 00K 1K t 33 47K 1 3K 4 7K 15K 22K 1 4 Carbon R201 R202 R203 R204 R205 R206 R207 R208 R209 R21 0 R21 1 R212 R21 3 R214 R21 5 R21 6 R21l R21 8 R21 I R220 R221 R222 R223 R224 R225 R226 R227 R228 R229 R230 R301 R302a b R303...

Page 33: ... 00K Not Used 3K 10K 470 r 8K l 1 1 1 Y 1 o Y Carbon Carbon Carbon Metal Carbon Carbon Metal Carbon Carbon Carbon Carbon R60Ba b R609a b B610a b R61 1a b R612a b R613a b R614a b R615a b R616a b R617a b R618a b R619a b R620a b R621a b R622a b R623a b R624a b R625a b R626a b R627a b R628a b R629a b R630a b R631a b R632a b R633a b R651 R652 R701 a b R702a b R703a b R704a b R705a b R706a b R707a b R70...

Page 34: ... Not Used 12K 220K 3 3K 10K 18K 16K 1I q9 B 2K 10K 1 00K 10K 1 00K 820K 470 K r 50K 150 4 7K 10K 12K 15K 47K 390 5 6K 620 1K 4 7K 4 1 2 1 1 1t Carbon Carbon Carbon Carbo n Carbon Metal Oxide Carbo n Metal 0xide Carbon Metal 0xide Carbon R823 R824 R851 R831 R832 R833 R834 R835 R901a b R902a b R903a b R904a b R905a b R906a b R907a b R908a b R909a b R9l0a b R911a b R91 2a b RS I 3a b R9 14a b R91 Sa ...

Page 35: ... 21100125 T201 T401 T85 1 IFT 216D RF Coil 122B Power Transformer 35702164 35501222 35900 1 97 TRANSISTORS Ref No Type No Manufacturer Mfr s Part No Su bstitute Type No Manufacturer TR1 O1 TR 102 TR 103 TR301a b TR302a b TR303a b TR304 TR3O5 T R306 TR3O7 TR3O8 TR309 TR31 t TR31 1 TR4Ol TR4O2 TR501a b TR502a b TR503a b TR504a b 3SK45 3SK45 sE3001 2SC945 25C1222 2SA640 2SC945 2SA733 2SC945 2SCg45 2S...

Page 36: ...81 2SA841 25C1681 2SA841 NE 9 Toshiba Matsushita N E C sor v l o r 9 Toshi ba Toshiba Ef r Sanken NEC San ken Sanyo NEC San ken NEC Toshiba 30201 191 3020 1 1 33 3000046 1 30201 1 81 3020 1 03 1 30000423 30201201 30000481 30300270 30r0006 1 3020 1 03 1 3020 1 1 33 30000443 30201132 30201 191 3000047 1 3020 1 03 1 30201 191 30300250 30201211 3020 1 03 1 30201211 30 1 0004 1 30000423 30201211 300004...

Page 37: ...L 2OO KO A DOLBY PLAY CAL 200 Ko A DOLBY REC LEVEL 200 Ksr A TREBLE lOO KO B BASS 1 O KOi B 28 1 00003 28 1 00002 28 1 00005 2B 1 00003 28 1 00002 28 1 00003 28000 1 20 28 1 00090 2B 1 00089 281 00088 281 00088 280001 23 28000122 28000122 28000 1 2 1 PRINTED WIRING BOARDS ASSEMBLED Ref No D escri ptio n Mfr s Part No 0036 5027 6038 7105 71 10 71 18 8025 9025 7 112 7 113 Tuner Front End Tuner Board...

Page 38: ...9217001 7002000 1 0504600 1 8423300 1 406401 51 404401 05 42280438 0905600 1 42400011 62 1 2000 1 40630085 1 2 3 4 5 6 7 8 I r0 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 21 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Wire Wrap Pin Jumper Wire Tapping Screw M3x6 Screw M3x15 Binding Head Tapping Screw M3x8 Heat Sink A Heat Sink B Flat Washer M3 Tapping Screw M3x12 Back Panel Speak...

Page 39: ...19 BLOCK DIAGRAM Q E E E a r wf l tt L_ U j l i 0 YJ EI L i f 9 E I I ffi I t l r l f ri t i 38 ...

Page 40: ...20 INTERNAL VIEW OF INTEGRATED CIRCUIT RC4558Dll F lPC30C DOTBY B TYPt II IEGRAIED CIRCUIT slGlrEilcs ilt5458 39 ...

Page 41: ...PREAMP BLOCK V C O BLOCK 90 F D 3 rA33so il 1__ __ 1 SWITCHING BLOCK tr ro P C or DC A BLOCK LAMP DRIVE BLOCK ...

Page 42: ... H ffi L o o O O 6 6 a a O G lJl E c lJ G o oo f tJ J rG O u t U ffi tx y4qz 18 l I 4q a L I i d_9 96a6ai 6 e e e F 5 E Nd hi I mr Bdl 59 E t EA J I I t I L R r00 E _ 1 F J rB l E r t r lnur fr El I xx a R G 5 EI lJl CJ c ...

Page 43: ...I l r 1 I tt_ rFT il ci l E a t r I I lR t I L Ee B l iEi i t i l s t Jiffi 1lsafJs l II 2 iia t_4 l iE U_ Ag t ll l0ll r0 1 o00E tixu t V ua h l 1 o o_o i NEEE soru Asz I rt ll0 lrN r F lasr oa I rrrl l i3 lIHilIY frJ G C5 Et CJ u l C c ...

Page 44: ...6 ql 6 g G GC EE o ai a E E A6 c E6o EP EE 6 E J 3qE E d r F3 f o lE E F S tE 9 a 89 EO60Ya 6 9 b rr H E oiY d o e ov r Ng i z U ffi 9 A l o a e O I o 6 n a O r4 1ig EI i Ei I 3l ss s 9 9 d g s d a a d e 96 6 E E d E F ...

Page 45: ... ti fi A r xJ JI V b H Kr E 5t rLn YrP 11 la rll Yf ll r ll ld zz It Bi t I L lE l i e E I c9 l 4ai l Be 5 ici rsgl lL_ Ilmul j aA U i f ii ll t II EI E ...