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NAD T762 Service Manual

Other manuals for T762: Owner's Manual
Manual is about: AV Surround Sound Receiver

Summary of T762

  • Page 1

    Nad service manual t 762 t 762 av surround sound receiver a v surround sound receiver draft date: ju ly 08.

  • Page 2: Safety Information

    2 safety information.

  • Page 3: Service Safety Precautions

    3 service safety precautions 1. Replacing the fuses caution: for continued protection against the risk of fire replace only with same type of fuse. Reference designator part number description f751*ah 33-0191001-00-88 fuse 10a 250v time lag 5x20 mm ul/csa f751*c 33-0181006-00-88 fuse 6.3a 250v time ...

  • Page 4: Specifications

    4 specifications power amplifier section rated distortion (rated power level into 8 ohms, thd 20 hz-20 khz fl/c/fr) ≤ 0.1 % (rated power level into 8 ohms, thd 20 hz-20 khz sl/sr/bs) ≤ 0.1 % input sensitivity (ref. 8 ohms, 1 khz) 220 ± 20 mv s/n ratio (a-wtd, 1khz, 1 w, 8 ohm, sl/sr/bl) ≥≥≥≥≥ - 72 d...

  • Page 5

    5 dts section output level (vol 0 db) : fl/fr/c/sl/sr track 6 1 khz 0.5 ± 2.0 w channel difference (fl ref) : fl/fr/c/sl/sr track 6 1 khz ± 1.0 db harmonic distortion (audio filter) : fl/fr/c/sl/sr track 10-14 1 khz ≤≤≤≤≤ 0.08 % frequency response (20 hz to 20 khz) track 26-30 +2/-1.5 subwoofer outp...

  • Page 6

    6 1 2 3 4 5 6 7 8 9 21 20 11 19 12 13 14 15 16 17 18 10 front panel rear panel / front panel view rear panel 1. Fm & am antenna 2. Main in / audio pre-outs / subwoofer out 3. Soft clipping on/off 4. Monitor out 5. Ms out (multisource out) 6. Cd input 7. Ir input & output 8. 12v trigger input & outpu...

  • Page 7: Disassembly Instructions

    7 disassembly instructions 1. Remove machine screws m4.0 x 8.0 ( 1 to 6 ) from the side panels. Remove tapping screw 3.0 x 8.0 ( 7 to 10 ) from the back panel. Refer to figure no. 1 . 1 4 5 6 7 8 9 10 2 3 2. Pull both sides of the top cover slightly outwards 11 and tilt approx. 35 ° and then remove ...

  • Page 8

    8 therm s en s n o r u l ver s io n : use j758 , j759 c e ver s io n : us e j7 60 mou nt o n c ha ss is gnd 8 2- 03 2 6 1 35 -0 7- 98 c able a ss y 3 way s # 2 6 u l2 8 77 l =1 50 36 -2 82 82 01-71-x x f f c c able 2 8 pin s p 1.2 5 l=2 00 mm 36 -2 8 2 8 2 0 1-71-xx f f c c able 2 8 pin s p1.2 5 l =...

  • Page 9: Block Diagram

    9 os d l c747 63 pin 1 4 a c o ut speaker output output speaker pin ( st/mo, mute, s meter ) ce/data/clk, rdsbus v fd driver cpu stereo mode ac3 mode multi ch in by cp u co ntr o l 4966 vfd by cp u 4966 co ntr o l speaker output audio ms 4966 co ntr o l by cp u co ntr o l by cp u 4966 ms v ide o ou ...

  • Page 10: Amplifier Adjustment

    10 amplifier adjustment idle current 1. Rotate r522 fully clockwise. 2. Connect dc millivoltmeter to p501 (i.E. Across half of r523, 0.22 ohm resistor). 3. Turn on the unit. 4. Adjust r522 for 1mv reading on voltmeter. 5. Leave power on for at least 5 min, and check for idle current again. 6. Repeat...

  • Page 11: Pcb Layout

    11 pcb layout audio board - component side audio board - copper side.

  • Page 12

    12 component video board - component side component video board - copper side digital board - component side side digital board - copper side.

  • Page 13

    13 dsp board - copper side nla dsp board - component side nla.

  • Page 14

    14 front/center amplifier board.

  • Page 15

    15 surround amplifier board.

  • Page 16

    16 key board/power switch - component side key board/power switch - copper side.

  • Page 17

    17 main board.

  • Page 18

    18 multi-channel board - component side multi-channel board - copper side.

  • Page 19

    19 power supply (standby) / led board isc board - component side isc board - copper side.

  • Page 20

    20 pre-out board - copper side pre-out board - component side rs-232 board - copper side - component side.

  • Page 21

    21 speaker terminal board trigger board video 6 board secondary board.

  • Page 22

    22 s-video board composite video board.

  • Page 23: Schematic Diagram

    23 dt a144esa dtc144esa e c b schematic diagram audio switch resistors : unless other wise specified are carbon film. Note: 1. Resistors, unless other wise specified, are 1/6w , 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%..

  • Page 24

    24 component video resist ors : unless otherwise specified are carbon film. Note: 1. Resist ors, unless other wise specified, are 1/6w , 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%..

  • Page 25

    25 e c b 2sa933 dtc144esa e c b dtc1 14esa dt a1 14esa dtc123esa dt a144esa e c b composite video resistors : unless otherwise specified are carbon film. Note: 1. Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%..

  • Page 26

    26 isc e c b 2sa1015 2sc1815 rn rn rn rn e c b 2sa1016k 2sc2362 resist ors : rn-cermic case, mo-met a l oxide, f-fusible unless other wise specified are carbon film. Note: 1. Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%....

  • Page 27

    27 power supply (secondary) note: 1 . R e sistors, unless otherwise specified, are 1/6w, 5%. 2. Components marked “ ” are safety critial p arts..

  • Page 28

    28 power supply (stand by) (f) (120v ah, only) e c b 2sc1815 resistors : f-fusible, unless otherwise specified are carbon film. Note: 1 . Resistors, unless otherwise specified, are 1/6w, 5%. 2. Components marked “ ” are safety critial p arts..

  • Page 29

    29 trigger dtc123esa e c b resistors : unless otherwise specified are carbon film. Note: 1 . Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%..

  • Page 30

    30 video 6 resist ors : unless otherwise specified are carbon film. Note: 1. Resist ors, unless otherwise specified, are 1/6w , 5%. 2. All ceramic cap acit ors, unless otherwise specified, are 50v , 10%..

  • Page 31

    31 e c b 2sa933 e c b 2sc1740 e c b 2sc2878 dtc144esa dtc123esa dt a144esa e c b s-video resistors : unless otherwise specified are carbon film. Note: 1. Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%..

  • Page 32

    32 e c b 2sa1016 2sc2362 b c e 2sa1606 2sc4159 b c e 2sa2031 2sc5669 e c b 2sc1740s e c b 2sb772 e c b 2sd600k 2sd631k dtc123esa e c b rn rn rn front / center amplifier note: 1. Resistors, unless other wise specified, are 1/6w , 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v ,...

  • Page 33

    33 surround / back surround amplifier rn rn rn e c b 2sc2362 e c b 2sa1015 2sa1815 b c e 2sa1606 2sc4159 b c e 2sa2031 2sc5669 e c b 2sd600k 2sd631k dtc123esa e c b e c b 2sa1016k 2sc2362 e c b 2sc1740s e c b 2sb772 resist ors : rn-ceramic case, mo-met a l oxide, unless other wise specified are carb...

  • Page 34

    34 speaker a & b rs-232 note: 1. Resistors, unless otherwise specified, are 1/6w, 5%..

  • Page 35

    35 cutting line for folded page! E c b 2sc1815 e c b rn1241 dta114esa e c b dsp t762 nla (refer to the t762 addendum) note: 1. Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic capacitors, unless otherwise specified, are 50v, 10%..

  • Page 36

    36 cutting line for folded page! E c b 2sc1815 keyboard note: 1. Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic capacitors, unless otherwise specified, are 50v, 5%..

  • Page 37

    37 cutting line for folded page! E c b 2sc2878 e b c ss8050 ss8550 e c b rn1241 dtc144esa dtc114esa dta114esa dta144esa e c b multi-ch / pre-out resistors : unless otherwise specified are carbon film. Note: 1. Resistors, unless otherwise specified, are 1/6w, 5%. 2. All ceramic capacitors, unless oth...

  • Page 38

    38 cutting line for folded page! E b c ss8050 main board resistors : unless otherwise specified are carbon film. Note: 1. Resistors, unless other wise specified, are 1/6w , 5%. 2. All ceramic cap acit ors, unless other wise specified, are 50v , 10%. Digital in & out resistors : unless otherwise spec...

  • Page 39: Ic Block Diagram

    39 1 2 3 4 5 6 7 8 9 10 dir a1 a2 a3 a4 a5 a6 a7 a8 gnd 20 19 18 17 16 15 14 13 12 11 vcc g b1 b2 b3 b4 b5 b6 b7 b8 (1) (2) (3) (4) (5) (6) (7) (8) (9) (11) (19) (18) (17) (16) (15) (14) (13) (12) oe ck d0 1d c1 en d1 d2 d3 d4 d5 d6 d7 q0 q1 q2 q3 q4 q5 q6 q7 74lvq574 dsp board: u1008, u1009 w27c020...

  • Page 40

    40 data 7:0, emad 7:0, gpio 7:0 cs parallel or serial host interface cmpclk, sclkn2 compressed data input interface pll clock manager va framer shifter input buffer controller dd dc mclk sclk lrclk audata[2.0] xmt958/audata3 cmpdat, sdatan2 cmpreq lrclkn2 sclkn1 stcclk2 lrclkn1 sdatan1 digital audio...

  • Page 41

    41 74hcu04 digital board: u1201 & u1202 1a 1y 2a 2y 3a 3y gnd 1 2 3 4 5 6 7 14 13 12 11 10 9 8 6a v cc 6y 5a 5y 4a 4y cs5333kz dsp board: u1027 74hc251 digital board: u1203 pin4 d0 w pin6 y pin5 pin8 gnd pin16 vcc pin7 strobe s0 pin3 d1 s1 pin2 d2 s2 pin1 d3 s3 pin15 d4 s4 pin14 d5 s5 pin13 d6 s6 pi...

  • Page 42

    42 vdd cont a cont d in/out in/out out/in sw d sw c out/in in/out out/in out/in in/out vss cont b cont c 14 8 9 10 11 12 13 1 7 6 5 4 3 2 sw a sw b sw a sw d sw b sw c tc9273 audio board: u301 & u304 level shift + shift register circuit s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 vss gnd vdd s1 s2 s3 s4 s5 s...

  • Page 43

    43 hcf4094b keyboard: u204~u207 & u211 serial in clock strobe latch 1 3-state 1 output enable 2 serial out q' s 10 serial out q s 9 15 1 d q cl cl 3 cl cl 1 cl cl 2 d q cl cl latch 2 tr tr latch 3 tr tr 3- state 2 3- state 3 3 d q cl cl q stages 3 - 7 2 2 2 2 2 2 2 2 q3 q2 q1 vss vdd q7 q8 q6 q5 q4 ...

  • Page 44: Com Out/in

    44 m6759 keyboard: u201 & u202 data bus data bus port 0 drivers p0.7:0 port 2 drivers p2.7:0 data bus data bus program address register program counter buffer dptr incrementer port 1 drivers p1.7:0 port 3 drivers p3.7:0 port latch port latch port latch serial port timer interrupt logic acc alu reg1 ...

  • Page 45

    45 0 2 com "y" out/in 3 1 inh v ee gnd 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 v cc 2 1 com "x" out/in 0 3 a b y channels in/out x channels in/out x channels in/out y channels in/out 74hc4052 ba7660fs component video board: u4301 mute ina gnd inb gnd n.C. Inc gnd 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 ...

  • Page 46

    46 lc74763 s-video board: u4101 serial- parallel converter composite synchro- nization signal control afc circuit sync separator sync detector composite synchronizat- ion signal separator control timing generator character output control background control v ideo output control synchronization signa...

  • Page 47

    47 2 2 28 14 3 4 5 6 7 8 9 10 11 12 13 level shifter shift register la tch circuit level shifter la tch circuit 27 26 25 24 23 22 21 20 19 18 17 16 15 l-s1 l-s2 l-com1 l-s3 l-s4 l-com2 l-s5 l-s6 l-com3 l-s7 l-com4 st vss gnd vdd r-s1 r-s2 r-com1 r-s3 r-s4 r-com2 r-s5 r-s6 r-com3 r-s7 r-com4 data ck ...

  • Page 48: Exploded View

    48 44 33 45 39 32 18 27 28 34 38 42 46 41 54 26 53 38 40 52 51 24 37 40 40 29 16 40 1 3 47 10 31 34 2 23 17 9 4 13 30 33 37 40 36 14 6 37 55 19 22 39 40 35 7 5 11 12 15 40 40 40 40 40 48 50 8 49 25 20 56 39 40 40 21 exploded view 51.

  • Page 49: Exploded View Parts List

    49 exploded view parts list item part no. Description qty. 1 10-0752001-00-10 window lens 1 2 10-0752002-71-00 volume knob assembly 1 3 10-0752005-71-00 volume bezel 1 4 10-0752007-01-00 video cover 1 5 10-0752011-00-00 led lens 1 6 10-0752012-01-00 racker button 2 7 10-0752015-01-02 led bezel 1 8 1...

  • Page 50: Special Function

    50 item part no. Description qty. 50 17-1402603-30-22 rubber foot i/d14 x o/d26 x 3 hh-48c 4 51*ah 29-4000003-00-38 am/fm tuner module kst-mb114ma1-22 1 51*c 29-4000002-00-38 am/fm tuner module kst-mb114ma1-20 1 52 34-0061030-00-67 jumper plug pitch 14mm 6 53*ah 34-0101001-00-70 ac outlet us polariz...

  • Page 51: Electrical  Parts List

    Reference no. Part no. Description pcb module 95-097625-12-01 power amplifier module front & center amplifier board pcb assembly 80-0907620-40-00 front and center amp assembly capacitors c501,c513,c525 22-3476052-00-43 cap elec ss 4.7uf 50v 20% c510-c511,c521-c522,c534-c535 22-3101082-00-28 cap elec...

  • Page 52

    52 reference no. Part no. Description r523,r547,r574 23-4228280-08-20 res rn 0.22 ohm 5% 5w sil 3 pin r589-r591 23-2100250-00-01 res mo 10 ohm 5% 2w surround left/right/back amplifier board pcb assembly 80-0907620-18-00 surround left/right/back amp assembly capacitors c554 22-3100022-00-43 cap elec ...

  • Page 53

    53 reference no. Part no. Description q871 21-1036003-50-06 xtr pw 3a/60v to-126 2sb772q q872 21-0000390-70-14 xtr ss npn hfe270-560 180mhz 2sc1740s resistors r843-r844,r8103 23-4228280-08-20 res rn 0.22 ohm 5% 5w sil 3 pin r857-r858,r8110 23-2100250-00-01 res mo 10 ohm 5% 2w r829-r830,r837-r838,r89...

  • Page 54

    54 reference no. Part no. Description c1166 45-0331055-55-57 cap cer smd 330pf 50v 10% x7r 0603 c1007,c1010,c1175-c1176 45-0103055-55-57 cap cer smd 10nf 50v 10% x7r 0603 inductors l1001-l1008 24-0100127-00-28 ind choke 10uh 10% ec36 ec36-100k transistors q1001-q1003 21-0000010-00-46 xtr ss npn hef ...

  • Page 55

    55 reference no. Part no. Description u1005 27-9841500-25-53 i.C. 96khz digital audio interface receiver cs8415a-cs u1007 27-2325607-00-88 i.C. Eeprom 256 x 8 byte 70ns w27c02-70 u1008-u1009 27-0657490-18-00 i.C. Logic octal d-flip flops 74lvq574m u1002-u1003,u1014 27-0324590-24-00 i.C. Logic octal ...

  • Page 56

    56 reference no. Part no. Description c4313-c4315 22-3106052-00-43 cap elec ss 1uf 50v 20% c4316,c4318,c4320 22-3101022-00-43 cap elec ss 100uf 16v 20% c4317,c4319,c4321 22-3220022-00-43 cap elec gs 22uf 16v 20% ics u4301 27-5176600-18-23 i.C. Video 3-channel 75 ohm driver ssop ba7660fs u4302-u4303 ...

  • Page 57

    57 reference no. Part no. Description capacitors c207-c211 22-3470022-00-43 cap elec ss 47uf 16v 20% c212 22-3102012-00-28 cap elec gr 1000uf 10v 20% c214 22-3100022-00-43 cap elec ss 10uf 16v 20% c224 22-3222032-00-34 cap elec gs 2200uf 25v 20% c255 22-3106052-00-43 cap elec ss 1uf 50v 20% ir d201 ...

  • Page 58

    58 reference no. Part no. Description c222,c241-c242 45-0102055-55-57 cap cer smd 1nf 50v 10% x7r 0603 c223 45-0123055-55-57 cap cer smd 12nf 50v 10% x7r 0603 c251-c254 45-0330055-55-57 cap cer smd 33pf 50v 10% x7r 0603 led baord pcb assembly 80-0907620-32-00 led assembly leds d211 26-0012587-01-10 ...

  • Page 59

    59 reference no. Part no. Description transistors q601-q602 21-0000360-00-00 xtr ss npn hfe200-700 30mhz 2sc2878a q603 21-0100390-70-14 xtr ss pnp hfe 30 250mhz spt dta 114esa q604 21-0000400-70-14 xtr ss npn hfe30 250mhz spt dtc114esa q626,q628 21-0000120-70-14 xtr ss npn hfe 68 30mhz spt dtc144es ...

  • Page 60

    60 reference no. Part no. Description c627-c628,c633-c634 22-3101022-00-43 cap elec ss 100uf 16v 20% c637,c642,c647,c652,c657,c662, 22-3100022-00-43 cap elec ss 10uf 16v 20% c667,c672,c700,c705 c640,c645,c650,c655,c660,c665, 22-3220022-00-43 cap elec gs 22uf 16v 20% c670,c675,c703,c708 c679-c680,c69...

  • Page 61

    61 reference no. Part no. Description c763 22-1103470-35-45 cap cer eckdrs 10nf 400vac +80/-20% resistors r751 23-5228330-00-00 res fusible 0.22 ohm 10% 1/2w axial r754*ah 23-8395232-00-25 conductive path resistor 3.9m ohm 1/2w 5% 250v standby transformer t751*ah 25-0040057-01-18 xformer pw ei-35 12...

  • Page 62

    62 reference no. Part no. Description secondary board pcb assembly 80-0907620-27-00 secondary assembly ca[acitors c801-c804 22-3123072-00-41 cap elec lp 12000uf 80v 20% diodes d801-d802 20-5125401-50-02 bridge rectifier 25a 400v mp254w br-25w isc board pcb assembly 80-0907620-74-00 isc assembly diod...

  • Page 63

    63 reference no. Part no. Description speaker board pcb assembly 80-0907620-67-00 speaker assembly speaker terminals m5101,m8101 34-3000021-00-80 spk ter 6p binding r/b w/o plug kf-j5000-06 m5102 34-3000022-00-80 spk ter 4p binding r/b w/o plug kf-j5000-04 s-video board pcb assembly 80-0907620-26-00...

  • Page 64

    64 reference no. Part no. Description u4102,u4103 27-5076250-21-23 i.C. Av switch dip ba7625 u4104 27-9496600-21-02 i.C. Quad bilateral switch lc4966 crystals x4101 28-5143200-06-19 crystal 14.318mhz 30ppm hc-49s x4102 28-5177200-06-19 crystal 17.73447mhz 30ppm hc-49s din jacks m411-m418 34-4110300-...

  • Page 65

    65 reference no. Part no. Description j4401 34-4510302-00-60 phone jack d6.3 1 pcb mount st-016s-01 composite video board pcb assembly 80-0907620-42-00 composite video assembly transistors q4201-q4203,q4207-q4208 21-0100370-70-14 xtr ss pnp hfe 270-560 140mhz 2sa933as q4204,q4206 21-0000120-70-14 xt...

  • Page 66: Packing Diagram

    66 packing diagram 1 2 3 4 5 6 7 8 9 10 11 item part no. Description qty. 1 64-0200001-01-00 polybag manual 1 2 31-6407520-00-98 fm wire antenna 1 31-6472801-00-28 am loop antenna w/stand 1 34-0081004-00-67 300 to 75 ohm adapter 1 37-0240300-00-81 lithium button cell cr2025 1 61-0762004-40-99 owner’...

  • Page 67: Version History

    67 version history serial number software ver. Pcb assembly version r2zt76200001-r2zt76200003 v1.12 all are a6 pcb assembly r2zt76200004-r2zt76200360 v1.13 all are a6 pcb assembly r2zt76200361-r2zt76200900 v1.18 all are a6 pcb assembly t 762i version part numbers serial number software ver. Pcb asse...

  • Page 68

    68 re-issue date: 2008 exploded view ............................................................................................................................ 2 - 3 exploded view parts list....................................................................................................... 4 - ...

  • Page 69

    69 1 2 3 4 5 6 7 8 9 10 11 12 15 14 13 16 17 18 19 20 21 22 23 26 27 28 29 30 31 37 38 39 40 42 42 43 44 45 45 45 46 45 45 45 45 45 45 45 45 45 47 47 48 48 49 50 53 47 43 54 56 57 60 61 62 59 63 64 65 67 66 68.

  • Page 70

    70 24 25 32 33 34 35 41 44 51 52 42 45 55 58 59 69 70 71 36.

  • Page 71

    71 1 02-0000019-00-00 nylon od16.5 x 9.3 x 3.5mm 1 2 10-0752001-00-10 window lens 1 3 11-0752002-72-00 volume knob assy 1 4 10-0752005-71-00 volume bezel 1 5 10-0752007-01-00 video cover 1 6 10-0752011-00-00 led lens 1 7 10-0752012-01-00 racker button 2 8 10-0752015-01-02 led bezel 1 9 10-0752017-01...

  • Page 72

    73 item part no. Description qty. Note: the components identified by mark are critical for risk of fire and electrical shock. Replace only with part number specified. : usa, canadian model only. : european model only. 49 14-0301000-54-00 taptite screw 3 x 10 p/h type b blk 5 50 14-0400802-04-00 mach...

  • Page 73

    X 1 q701 module with flying leads x 1 black foam block, with double sided tape on two sides x 1 set of instructions when q701 becomes defective, the t752 will turn on, but he vfd will not light up. The purpose of replacing the transistor q701 with a module is to facilitate a more reliable and quicke...

  • Page 74

    X cut out the following parts: 1. Diodes d709 and d710 2. Q701 (cut out or pull out) 3. Cut out r702 75 another view of tapping into the ac input source wire #10 of cable ac17.6v2.

  • Page 75: Service Manual

    68 service manual t 762 av surround sound receiver nad electronics ltd london © nad 2008.