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NAD L 70 Service Manual

Other manuals for L 70: Owner's Manual
Manual is about: AV SURROUND SOUND DVD RECEIVER

Summary of L 70

  • Page 1

    Nad service manual l 70 l 70 av surround sound dvd receiver av surround sound dvd receiver draft date: 20 jan 2004.

  • Page 2

    Front panel identification of controls 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 attention! Please make all connections to your l70 receiver with the unit unplugged. (it is also advisable to power-down or unplug all associated components while making or breaking any signal or ac power connecti...

  • Page 3: Section 1

    1-3 section 1 summary contents product safety servicing guidelines.......................................................................................... 1-4 servicing precautions ........................................................................................................................

  • Page 4

    1-4 product safety servicing guidelines caution : do not attempt to modify this product in any way. Never perform customized installations without manufacturer’s approval. Unauthorized modifications will not only void the warranty, but may lead to your being liable for any resulting property damage ...

  • Page 5: Servicing Precautions

    1-5 servicing precautions caution : before servicing the a/v receiver covered by this service data and its supplements and addends, read and follow the safety precautions. Note : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions...

  • Page 6: Specifications

    1-6 specifications amplifier section output power (front) : f.T.C rating: 60 watts rms per channel minimum, both channels driven into 8 ohms from 20 hz to 20khz with no more than 0.09% total harmonic distortion surround output power (0.5% thd, 1 khz, 8 ohms) : 50 + 50 watt (front) 50 watt (center) 5...

  • Page 7

    1-7 disassembly 1> removal of top cover 2> removal of front panel.

  • Page 8

    1-8 principal parts location reset procedure for receiver functions only: press play then stop then the fm/am key, holding in the fm/am key for more than 5 seconds. Reset procedure for dvd-player functions only: select defaults to restore factory defaults. The factory default password is 1234..

  • Page 9

    1-9 1-10 exploded view c 20 s c r e w s 19 c tb 3+6f 1 1 c up 11554-2 c up 11445 hj dr l-a700hd3 c up 11554-1 c up 11553-1 c up 11555 c up 11556-1 hdmk d1206p t s 3 c lt 5v 031zu(ze ) c up 11553-2 c up 11553-5 c up 11553-4 s 17 s 18 1 3 s c r e w s c r e w s 11 s 10 c t b 3+16j c t b 3+20j 4 s c r e...

  • Page 10: Section 2

    2-11 section 2 electrical contents contents ic block diagrams & pin description ............................................................................. 2-12 ~ 2-34 diagrams ............................................................................................................................

  • Page 11

    2-12 pin no. Symbol i/o description 1 osd_h i osd input sensing port 2 remote i remote control data input port 3 rds_ck o clk/data port for rds ic(sa6579tv1) 4 rds_da i 5 f_mute o function mute control output port("h") 6 evol_da o data / clk / chip enable control port for electronic vol. Ic(m62446af...

  • Page 12

    2-13 u-com ic pin assignment & block diagram pin assignments (top view) p96 (s14) p95 (s13) p94 (s12) p93 (s1 1) p92 (s10) p91 (s9) p90 (s8) p87 (s7) p86 (s6) p85 (s5) p84 (s4) p83 (s3) p82 (s2) p81 (s1) p80 (s0) p77 (g0) p76 (g1) p75 (g2) p74 (g3) (sis) p97 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17...

  • Page 13

    2-14 cmpdat sdatan2 cmpclk sclkn2 cmpreq lrclkn2 sclkn1 stcclk2 lrclkn1 sdatan1 clkin clksel filtd filts va agnd dgnd(3:1) vd(3:1) xmt95 auda lrclk sclk mclk dc dd extmem. Gpio8 a800t interq a1, scdin a0, scclk cs stc parallel or serial host interface reset scdio, scdout, psel, gpio9 wr, dr, emwr, g...

  • Page 14

    2-15 pin no. Pin name i/o function 1,12,23 +vd1 - digital power supply. Normally +2.5v 2,13,24 dgnd - digital ground 3 aud3 o spdif transmitter output/digital audio output(n.C) 4 wr i host write strobe pin(connected to gnd with an external resistor) 5 rd i host parallel output enable pin(pulled up w...

  • Page 15

    2-16 p5 p6 p7 p8 vss p9 p10 p11 p12 v dd p4 p3 p2 p1 clr stb clk data 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 shift circuit latch circuit controller circuit p1 p2 p3 p4 p5 p11 p12 clk data 10 11 12 13 14 15 16 17 1 8 9 stb clr nju3713 (ic28 : expander / main) block diagram.

  • Page 16

    2-17 block diagram (ic42: ak4586) pin assignment (ic42: ak4586) adc lin hpf adc rin hpf dac datt lpf lout1 dac datt lpf rout1 dac datt lpf lout2 dac datt lpf rout2 dac datt lpf lout3 dac datt lpf rout3 audio i/f input selector clock recovery clock generator x’tal oscillator µp i/f xti xto mcko tx rx...

  • Page 17: Pin/function (Ic42: Ak4586)

    2-18 pin/function (ic42: ak4586).

  • Page 18

    2-19 s5 s1 s2 6.2db amp 75 dirver 6.2db amp 6.2db amp s4 s3 s6 s7 20k 20k 20k 13 vin1 v+ v- sw2 sw1 vout1 vout2 vout3 sw4 block diagam (njm2296m /main ic96) sw3 gnd sw5 vin2 vin3 vin4 vin5 1 15 11 16 10 14 12 2 9 7 5 4 6 8 3 20k 20k 20k 20k 20k 75 dirver 75 dirver 1 2 3 4 8 pin funciton 1. A output ...

  • Page 19

    2-20 level shifter 2 1 2 3 4 1 5 6 2 8 4 1 2 3 4 6 8 4 1 3 4 5 6 7 8 9 10 14 28 11 12 13 27 26 25 24 23 22 21 20 19 18 17 16 15 latch circuit shift register level shifter latch circuit l-s r-s vss gnd vdd l-s l-s l-s l-s l-com l-s l-com l-s 7 l-s l-com st r-s r-s r-s 5 r-s 1 r-com r-s 2 r-com r-s r-...

  • Page 20

    2-21 m62446fp (electronic volume/input : ic13) system block diagram pin configuration and ic internal block diagram c in cout swout slout srout lout latch data clk µ-com interface rout sw in sl in sr in bypass1 bypass2 l in r in volume volume tone 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2...

  • Page 21

    2-22 lc74763 (osd ic54) cs 8 9 10 15 11 12 13 14 30 17 1 29 27 28 26 24 25 23 19 47 2 3 5 6 19 18 16 20 21 serial- parallel converter 8-bit latch and command decoder horizontal character size register horizontal size counter v ertical character size register v ertical size counter horizontal display...

  • Page 22

    2-23 saa6579tv1 (rds filter ic82) anti- aliasing filter 57 khz bandpass reconstruction filter oscillator and divider quality bit generator differentian decoder biphase costas loop clocked comparator reference voltage clock and sync test logic and output selector switch regeneration variable and fixe...

  • Page 23

    2-24 (ic10, ic11 : sdram).

  • Page 24

    2-25 hy57v161610d.

  • Page 25

    2-26 (es4318 : ic01).

  • Page 26

    2-27 pin geography.

  • Page 27

    2-28.

  • Page 28

    2-29 clk iset dgnd scl sda pdat[7:0] rd wr addr xtal_out vd[7:0] hsync vsync field int reset i 2 c interface host parallel interface color sub-carrier synthesizer 8 video formatter control registers chroma modulate chroma amplifier output interpolate lpf burst insert chroma interpolate lpf luma inte...

  • Page 29

    2-30

  • Page 30

    2-31 hy29f400 (flash memory : ic03) pin configurations state c o n t r o l w e # c e # oe# byte# c o m m a n d r e g i s t e r dq[15:0] a[17:0], a-1 v c c d e t e c t o r t i m e r e r a s e v o l t a g e g e n e r a t o r a n d s e c t o r s w i t c h e s p r o g r a m v o l t a g e g e n e r a t o...

  • Page 31

    2-32 signal descriptions hy29f400 e m a n e p y t n o i t p i r c s e d ] 0 : 7 1 [ a s t u p n i . H g i h e v i t c a , s s e r d d a 4 4 1 , 2 6 2 f o e n o t c e l e s s t u p n i 8 1 e s e h t , e d o m d r o w n i e s e h t , e d o m e t y b n i . S n o i t a r e p o e t i r w r o d a e r r o ...

  • Page 32

    2-33 eeprom : ic13 pin configuration a0, a1, a2 scl sda wp v cc gnd i / o i / o i i i function pin name * 1 an open drain output requires a pull-up resistor. Serial clock input serial data input, serial data output wite protect pin power supply ground (0v) out of use. Please connect to gnd. Slave an...

  • Page 33

    2-34 to-92s 1. Emitter 2. Collector 3. Base 1. Emitter 2. Collector 3. Base kra102m ksc2785y ksa1175y ktc3200gr kta1271y kta1268gr ksb811y ksa733 krc102m ktc3114a kta1360y ktc3423y 1. Emitter 2. Collector 3. Base to-126 to-92 1 2 3 1 2 3 1 2 3 1. Base 2. Collector 3. Emitter ktb1369y ktd2061y to-220...

  • Page 34

    2-35 2-36 1. Block diagram.

  • Page 35

    2-37 2-38 2. Wiring diagram.

  • Page 36

    2-39 2-40 3. Schematic diagram front & µ-com part.

  • Page 37

    2-41 2-42 input & volume part.

  • Page 38

    2-43 2-44 dsp & codec part.

  • Page 39

    2-45 2-46 video part.

  • Page 40

    Amp. Part 2-47 2-48.

  • Page 41

    2-49 2-50 power part.

  • Page 42

    2-51 2-52 dvd back_end part.

  • Page 43: Section 3

    3-63 section 3 electrical parts list cup11553-1 micom pcb bn87 cwb1d909130bm wire ass'y bn99 cwb1e904170bm wire ass`y c813 hcea1hh4r7t capacitor , elect 4.7uf 50v c814 cckt1h561kb capacitor , ceramic 560pf 50v kb c815 cckt1h102kb capacitor , ceramic 1000pf 50v kb c816, c818 hcea1hh2r2t capacitor , e...

  • Page 44

    3-64 c905~c908 hcea1ch101t capacitor , elect 100uf 16v c909 hcea1hh4r7t capacitor , elect 4.7uf 50v c910 hcea1hh470t capacitor , elect 47uf 50v c911~c915 cckt1h103zf capacitor , ceramic 0.01uf 50v zf c916 hcea1hh4r7t capacitor , elect 4.7uf 50v c917~c919 cckt1h103zf capacitor , ceramic 0.01uf 50v zf...

  • Page 45

    3-65 r835 crd20tj101t resistor , carbon 100 ohm 1/5w j r836 crd20tj103t resistor , carbon 10k ohm 1/5w j r837 crd20tj222t resistor , carbon 2.2k ohm 1/5w j r838 crd20tj103t resistor , carbon 10k ohm 1/5w j r840, r841 crd20tj102t resistor , carbon 1k ohm 1/5w j r842, r843 crd20tj103t resistor , carbo...

  • Page 46

    3-66 r818 crd20tj182t resistor , carbon 1.8k ohm 1/5w j r819 crd20tj223t resistor , carbon 22k ohm 1/5w j rc81 hrvksm603th2 remote senser ksm-603th2 s809 hst1a019zt sw , tact s810~s817 cst1a012zt sw , tact skhv10910g cup11553-3 encoder pcb bn83 cwb1c906050en wire ass'y c803 hcbs1h821kbt capacitor , ...

  • Page 47

    3-67 c146~c151 hcus1h470ja capacitor , chip 47pf c152~c154 hcus1e104zf capacitor , chip 0.1uf 25v c172, c173 hcus1e104zf capacitor , chip 0.1uf 25v c175, c176 hcus1e104zf capacitor , chip 0.1uf 25v c178, c179 hcea1vh100t capacitor , elect 10uf 35v c180~c183 hcus1h470ja capacitor , chip 47pf c184~c18...

  • Page 48

    3-68 c419, c420 hcus1e104zf capacitor , chip 0.1uf 25v c421, c422 hcus1h330ja capacitor , chip 33pf c423, c424 hcus1e104zf capacitor , chip 0.1uf 25v c425~c428 hcus1h101ja capacitor , chip 100pf c429 hcus1e104zf capacitor , chip 0.1uf 25v c431~c434 hcea1ch101t capacitor , elect 100uf 16v c435, c436 ...

  • Page 49

    3-69 load no. Part no. Description specification q194, q195 hvtktd1304t transistor , chip (mute) ktd1304 q401, q402 hvtksc2316yt transistor ksc2316y r101~r106 hrj10dj471t resistor , chip 70 ohm 1/10w r107~r112 hrj10dj102t resistor , chip 1k ohm 1/10w r113~r118 hrj10dj224t resistor , chip 220k ohm 1/...

  • Page 50

    3-70 r246 hrj10dj121t resistor , chip 120 ohm 1/10w r247~r250 crd20tj331t resistor , carbon 330 ohm 1/5w j r251 hrj10dj471t resistor , chip 470 ohm 1/10w r252 hrj10dj121t resistor , chip 120 ohm 1/10w r253~r255 hrj10dj1r0t resistor , chip 1 ohm 1/10w r256~r260 hrj10dj680t resistor , chip 68 ohm 1/10...

  • Page 51

    3-71 r434 hrj10dj0r0t resistor , chip jumper r438~r440 hrj10dj1r0t resistor , chip 1 ohm 1/10w r441 hrj10dj330t resistor , chip 33 ohm 1/10w r442~r444 hrj10dj4r7t resistor , chip 4r7 ohm 1/10w r445 hrj10dj331t resistor , chip 330 ohm 1/10w r446 hrj10dj105t resistor , chip 1m ohm 1/10w r447 hrj10dj1r...

  • Page 52

    3-72 c577 hcus1h181ja capacitor , chip 180pf c578 hcus1h470ja capacitor , chip 47pf c579 hcea1hh1r0t capacitor , elect 1uf 50v c580, c581 hcea1ah471t capacitor , elect 470uf 10v c582, c583 hcus1h820ja capacitor , chip 82pf c584 hcea1ah471t capacitor , elect 470uf 10v c585~c587 hcea1vh100t capacitor ...

  • Page 53

    3-73 r561 hrj10dj393t resistor , chip 39k ohm 1/10w r562 hrj10dj152t resistor , chip 1k5 ohm 1/10w r563 hrj10dj682t resistor , chip 6k8 ohm 1/10w r564, r565 hrj10dj102t resistor , chip 1k ohm 1/10w r566 hrj10dj104t resistor , chip 100k ohm 1/10w r567~r569 hrj10dj562t resistor , chip 5k6 ohm 1/10w r5...

  • Page 54

    3-74 q590~q594 hvtkta1268grt transistor kta1268gr q596~q598 hvtkta1268grt transistor kta1268gr q641, q642 hvtktc3200grt transistor ktc3200gr q644~q646 hvtktc3200grt transistor ktc3200gr q647,q648 hvtkta1268grt transistor kta1268gr q650~q652 hvtkta1268grt transistor kta1268gr q665, q666 hvtktc3200grt...

  • Page 55

    3-75 r683, r684 crd20tj561t resistor , carbon 560 ohm 1/5w j r686~r688 crd20tj561t resistor , carbon 560 ohm 1/5w j r689, r690 crd20tj152t resistor , carbon 1.5k ohm 1/5w j r692~r694 crd20tj152t resistor , carbon 1.5k ohm 1/5w j r701, r702 crd20tj121t resistor , carbon 120 ohm 1/5w j r704~r708 crd20...

  • Page 56

    3-76 d925~d928 hvd1ss133mt diode 1ss133t-77 jk91 cjj5q007z terminal,sp(rrrr/bbbb) jk92 cjj5n005z terminal,sp(r/b) l926~l928 cley0r5kak coil , speaker 0.5uh k l930, l931 cley0r5kak coil , speaker 0.5uh k q901 kvtksc2785yt transistor ksc2785y q902 hvtkra102mt transistor kra102m q903 hvtkta1271yt trans...

  • Page 57

    3-77 r990 brderc12ugk335t resistor , carbon(ah ver.) 3.3m ohm 1/2w ry91 hsl1a008ze relay sdt-s-112dmr t901 clt5l053ze trans former, sub (c ver.) clt5l053zu tran sformer, sub (ah ver.) cup11556-3 connector pcb bn14 kjp12gb99zm connector cn41 kjp12ga98zm wafer r967 crd20tj222t resistor , carbon 2.2k o...

  • Page 58

    3-78 ic10, ic11 hvihy57v161610d i.C , sdram(16m) hy57v161610dtc8 ic13 hvibr24c16f i.C , eeprom(16k) 2k*8 sop8 ic14 hvics4955 i.C , video encoder cs4955 l101 hlz9z005z ferrite core 6*10(a) + coil l102 hlz9z005z ferrite core 6*10(a) + coil l104, l105 hrj10dj0r0t resistor , chip jumper r101 hrj10dj361t...

  • Page 59

    3-79 cwc1b4a23a300b cable, card cwe4202050as wire ass`y cwe4202100ar wire ass`y cwzdr700bn47 wire ass`y bn12 cwzhts5000bn12 cable,atapi(flate,40p) clz9w003z ferrite , ring 29x7.7x19 cwc1b4a15a150b cable , card cwc1b4a17a120b cable , card cwc1b4a23a100b cable , card cwc1c4a13b200b cable , card cwc1c4...

  • Page 60: Service Manual

    Service manual l 70 av surround sound dvd receiver nad electronics ltd toronto © nad 2002.