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NAD T977 C/AH Service Manual

Other manuals for T977 C/AH: Owner's Manual, Owner's Manual
Manual is about: Seven Channel Power Amplifier

Summary of T977 C/AH

  • Page 1

    L au n a m e ci vr es l au n a m e ci vr es t977 c/ah del: o m t977 l a u n a m e ci v re s © nad 2012 nad electronics international toronto t977 h a/ c re if il p m a le n n a h c ne ve s t977 h a/ c rei fil p m a l e n n a h c ne ve s seven channel amplifier.

  • Page 2

    Contents front panel/rear panel view ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ．． ． ． ． ． ． ． ．． ． ． ． ． ． ． ． ．． ． ． ． ． ． ． ． ． 3 specifications ． ．． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ．． ． ． ． ． ． ． ．． ． ． ． ． ． ． ． ．． ． ． ． ． ． ． ． 4 alignment procedure/alignment points ．．...

  • Page 3

    - 3 -.

  • Page 4

    - 4 - specifications continuous average power ≥ 140 w (21.5 dbw) output into 8 ohms or 4 ohms (min. Power per channel, 20 hz – 20 khz, both channels driven, with no more than rated distortion) rated distortion ≤ 0.03% (thd 20 hz – 20 khz) clipping power ≥ 170 w(22.3 dbw) (maximum continuous power pe...

  • Page 5

    Alignment procedure (t977) a. Thermal sense adjustment this adjustment should be always done when the t977 is cool condition. (that means the temperature inside the unit should be almost same as the ambient temperature. Connector p208b that connects the transformer and power board should be removed ...

  • Page 6

    For example, all 7 channels at 50w/4ohms for 10 minutes or 5 minutes or even less (as long as the fan can starts turning). Turn off the signal but still keep the unit operating for 1 minute. Then run all 7 channels at 1khz, 0.25w at 4 ohms load, monitor the voltage at tp1 of pot rv201. Adjust rv201 ...

  • Page 7

    Agnd +62v +62v -62v -62v agnd agnd agnd isctrig ac off sen protect -68v +68v -18v +18v sc pnp sc npn agnd +62v +62v -62v -62v agnd agnd agnd isctrig ac off sen protect -68v +68v -18v +18v sc pnp sc npn agnd +62v +62v -62v -62v agnd agnd agnd isctrig ac off sen protect -68v +68v -18v +18v sc pnp sc n...

  • Page 8

    Input offset isctrig +62v sen 62v testpoint 5 +12v -12v +12v -12v +12v -12v -12v offset +62v sen isc 62v input tp5 sc npn sc pnp /1/2w /1% temp sen all polyester capacitors are 63v unless noted. All elec. Capacitors are 50v unless noted. All resistor are 1/6w rj13 unless noted. /1% /1% /1% /3w /1% /...

  • Page 9

    +62v -62v +68v isctrig agnd sc npn ac off agnd -62v agnd ac off sc pnp -62v sen -18v protect -68v +62v +18v isctrig tp2 tp1 sc npn sc pnp signal tp5 sen agnd agnd -18v -18v vo +68v -68v protect offset tp1 tp5 tp2 sen agnd offset vo +68v agnd +18v ac off -62v -68v -18v protect +62v signal +12v +12v +...

  • Page 10

    Sen5 sen3 sen1 sen2 sen3 sen7 fan1 fan1 sen6 sen4 sen5 prot3 -70v fan1 sen2 dgnd thermal stby agnd4 fan2 sen5 +18v +70v isctrig_6 isctrig_7 isctrig_3 sen7 agnd4 -18v acoff agnd agnd6 +5vd sen3 -62v_3 agnd6 -62v_4 agnd4 fan3 sen6 scled isctrig_4 prot4 +5vd dgnd dgnd prot7 isctrig_1 prot2 +62v_4 -62v_...

  • Page 11

    Prot4 prot6 scled +5vd prot3 +12vd prot2 prot3 prot4 prot1 prot5 prot6 prot7 +5vd prot7 +5vd scled +12vd +12vd dgnd dgnd stbyled stbyled amber blue prot5 prot1 prot2 power power /1/2w ch2 led ch3 led ch4 led ch5 led ch6 led ch7 led ch1 led all polyester capacitors are 63v unless noted. All elec. Cap...

  • Page 12

    -62v_4 -62v_3 scp_4 +62v_3 scled +62v_4 trig en dgnd scled scn_4 scp_3 scn_3 +62v_3 -62v_3 scp_4 -62v_4 +62v_4 trig in scp_3 scn_4 scn_3 trig en trig in dgnd scn_3 scp_4 dgnd scp_3 +62v_3 -62v_3 scled +62v_4 -62v_4 scn_4 trig in trig en /1% /1% /1% /1% /1% /1% /1% /1% /1% /1% /1% /1% /1/2w /1/2w /1/...

  • Page 13

    +5vd +5vd /y type /1% /1% /16v /x type /400v /16v neutral live all polyester capacitors are 63v 5% unless noted. All elec. Capacitors are 50v 20% unless noted. All resistor are 1/6w 5% rj13 unless noted. All zener diode are 1/2w unless noted. To mother board from main transformer to main transformer...

  • Page 14

    Agnd4 -62v_4 +62v_4 agnd4 +62v_4 agnd4 -62v_4 agnd4 -68v +68v dgnd agnd acoff +18v fan2 -18v fan3 fan1 trig en agnd6 +62v_3 agnd6 -62v_3 agnd6 +62v_3 dgnd scled scn_3 scn_4 scp_4 +62v_3 scp_3 -62v_3 -62v_4 +62v_4 -68v scn_3 +18v acoff -18v +68v prot5 sen5 scp_3 -68v scn_3 +18v acoff -18v +68v prot6 ...

  • Page 15

    Tp902 115deg thermal circuit breaker tp902 115deg thermal circuit breaker 1 2 j901 2pin2.54-c j901 2pin2.54-c 1 2 tp901 115deg thermal circuit breaker tp901 115deg thermal circuit breaker 1 2 tp904 115deg thermal circuit breaker tp904 115deg thermal circuit breaker 1 2 tp903 115deg thermal circuit b...

  • Page 16

    Rl101 bp101 j1 01 d108 t977 amp board upper - solder side continued protection against risk of fire replace only with same type utiliser un fusible de rechange de meme type! R163 t977 amp board upper - component side c121 fan rv103 c 1 19 + idling d107 r162 r135 q116 r134 r169 d 111 c117 fuse and ra...

  • Page 17

    P202a p201a designed by:nad t977 team 2012/04/18 f203&f204 are t1.6al/250v c210 f203 t977 pow board upper - solder side bus203 f204 f201 f202 q213 c225 c214 c248 w204 c223 c222 c291 c254 q217 c250 q214 b r 242 r247 q216 b c249 r244 e e c253 r241 b r 2 45 b r 248 r249 r246 q215 e e r243 c252 q 239 b ...

  • Page 18

    P301b t977 display board upper - solder side t977 display board t977 display board upper - component side r 343 q 329 c 3 01 d 3 12 s301 d308 q305 q316 r 332 r 316 r 302 r 331 r 310 r 338 r 324 r 317 r 303 r 311 r 339 r 325 r 318 r 304 r 312 r 333 r 340 r 319 r 326 r 305 q325 q318 q304 q312 d304 q32...

  • Page 19

    T977 softclipping&trig board upper - solder side t977 softclipping&trig board upper - component side c401 r410 r406 r402 c402 1 d402 c404 t977 softclipping&trig board s401 r413 vm1.0 2012/04/26 r414 r415 r412 r408 d405 d404 r404 s401 p401b c403 r403 r407 r411 d403 r401 r405 d401 r409 j401 - 19 - pcb...

  • Page 20

    C501 tr503 b r 501 tr502 t977 stby board upper - solder side t977 stby board upper - component side r507 c510 r v 5 01 rv 501 p 501b p 5 0 2b 1 w505 only w 505 w 5 03 w 504 w503&w504 only for ah version for c version p 5 0 5b p c 501 against risk of fire type fuse and rating caution: utiliser un fus...

  • Page 21

    P621b f a n1 d g nd f a n2 d g nd 1 p 60 7b 9 1 p 61 4b 9 2 p622b tr ig in tr ig en scn_3 scn_4 sc p_3 +62 v_3 sc p_4 +62 v_4 -62 v_3 -62 v_4 1 dg nd scl ed p 618b 12 1 1 p 608b 9 2 9 p 6 1 5b 1 p 61 1b p 604b 1 9 1 9 1 p 60 5b 9 1 p 606b 1 1 9 p 613b 9 1 p 612b 9 f a n3 d g nd 1 p 609b 9 1 p 6 1 0b...

  • Page 22

    Designator description part type part number footprint ah p/n ： 00-97700-10 c p/n ： 00-97700-20 ah p/n ： 01-97710-10 c p/n ： 01-97710-20 pcb1 board (amp module ) diode d100 switch diode 1n4148w-nr 33-44148-17 sod-123 d101 switch diode 1n4148w-nr 33-44148-17 sod-123 d102 switch diode 1n4148w-nr 33-44...

  • Page 23

    Designator description part type part number footprint q122 transistor 2sa1312gr(te85l,f) 31-01312-00 to-236mod q123 transistor 2sa1360-o 31-01360-00 to126/90/ecb q124 transistor 2sc3423-o 31-03423-00 to126/90/ecb q125 transistor 2sc3324-gr(te85l,f) 31-03324-00 to-236mod q126 transistor 2sc3423-o 31...

  • Page 24

    Designator description part type part number footprint r125 chip resistor 680 Ω ,0805,1/8w,±5% 07-90681-01 sm/r_0805 r126 chip resistor 220 Ω ,0805,1/8w,±5% 07-90221-01 sm/r_0805 r127 chip resistor 4.7k Ω ,0805,1/8w,±5% 07-90472-01 sm/r_0805 r128 chip resistor 1m Ω ,0805,1/8w,±5% 07-90105-01 sm/r_08...

  • Page 25

    Designator description part type part number footprint r194 chip resistor 150 Ω ,0805,1/8w,±5% 07-90151-01 sm/r_0805 r195 chip resistor 100k Ω ,0805,1/8w,±5% 07-90104-01 sm/r_0805 r196 metal oxide film resistor 100 Ω , 1/2w, 5% 07-30101-00 pitch=15mm r197 chip resistor 20k Ω ,0805,1/8w,±5% 07-90203-...

  • Page 26

    Designator description part type part number footprint c128 alu electrolytic capacitor 10uf/50v, 20%, 105 ℃ 06-10051-01 pitch=5mm c129 ceramic capacitor smd 10nj,50v,0805,npo 26-10351-11 sm/c_0805 c130 polyester capacitor 470nf, 10%, 63v 25-47461-01 pitch=5mm c131 polyester capacitor 470nf, 10%, 63v...

  • Page 27

    Designator description part type part number footprint binding post(black) 17-03002-04 binding post(red) 17-03002-03 binding post(black) 17-03002-14 binding post(red) 17-03002-13 binding post(red) abs (73-001003-0) binding post(black) abs (73-001004-0) bdp cap(red) abs (73-001005-0) bdp cap(black) a...

  • Page 28

    Designator description part type part number footprint d223 switch diode 1n4148 33-44148-00 pitch=7.5mm d224 switch diode 1n4148 33-44148-00 pitch=7.5mm d225 switch diode 1n4148 33-44148-00 pitch=7.5mm d226 switch diode 1n4148 33-44148-00 pitch=7.5mm d227 switch diode 1n4148 33-44148-00 pitch=7.5mm ...

  • Page 29

    Designator description part type part number footprint ic202 ragulator l7912ct 03-07912-00 to220ab/123 ic203 quad op-amp tl084cn 03-00084-00 dip.100/14/w.300/l.750 ic204 gate ic sn74hc21n 03-07421-00 dip.100/14/w.300/l.750 ic206 dual op-amp tl082cp 03-00082-00 dip.100/8/w.300/l.750 resistor r201 met...

  • Page 30

    Designator description part type part number footprint r270 metal film resistor 43k Ω , 1/6w, 1% 07-24302-50 ax/.200x.080/.031 r271 metal film resistor 43k Ω , 1/6w, 1% 07-24302-50 ax/.200x.080/.031 r272 metal film resistor 43k Ω , 1/6w, 1% 07-24302-50 ax/.200x.080/.031 r273 metal film resistor 100 ...

  • Page 31

    Designator description part type part number footprint c211 polyester capacitor 10nf, 10%, 100v 25-10312-01 rad/.300x.150/ls.200/.035 c212 polyester capacitor 10nf, 10%, 100v 25-10312-01 rad/.300x.150/ls.200/.035 c213 alu electrolytic capacitor 3300uf/35v, 20%, 105 ℃ 06-33231-00 cpcyl1/d.900/ls.400/...

  • Page 32

    Designator description part type part number footprint for f202 fuse holder ls-ptf-78, (cq-200c) ja20-20000-06 rad/.1000x.400/ls.850/.066 for f203 fuse holder ls-ptf-78, (cq-200c) ja20-20000-06 rad/.1000x.400/ls.850/.066 for f204 fuse holder ls-ptf-78, (cq-200c) ja20-20000-06 rad/.1000x.400/ls.850/....

  • Page 33

    Designator description part type part number footprint d308 led φ 5, red orange blue 33-55236-00 d309 led φ 5, blue red 33-50565-03 dyl/d.200/ls.100/.039 d309 led φ 5, blue red, a 33-50565-00 dyl/d.200/ls.100/.039 d312 zener diode dl5241b,11v,0.5w,±5% 33-11100-11 dl-35 transistor q301 transistor a10...

  • Page 34

    Designator description part type part number footprint r336 chip resistor 10k Ω ,0805,1/8w,±5% 07-90103-01 sm/r_0805 r337 chip resistor 10k Ω ,0805,1/8w,±5% 07-90103-01 sm/r_0805 r338 chip resistor 10k Ω ,0805,1/8w,±5% 07-90103-01 sm/r_0805 r339 chip resistor 10k Ω ,0805,1/8w,±5% 07-90103-01 sm/r_08...

  • Page 35

    Designator description part type part number footprint d505 switch diode 1n4148 33-44148-00 dax/.300x.080/.031 br501 rectifier bridge b6s, 0.8a 600v 33-30062-00 mbs ic ic501 power controller ic tny274pn 03-00274-00 dip-8c ic502 shunt regulator tl431 03-00431-02 to-92 pc501 photocoupler pc817x1j000f ...

  • Page 36

    Designator description part type part number footprint r615 chip resistor 10k Ω ,0805,1/8w,±5% 07-90103-01 sm/r_0805 capactior c601 ceramic chip capacitor 100nk,50v,0805,x7r 26-10451-11 sm/c_0805 c602 tan capacitor 47uf,25v,±10% 27-47021-02 case-d(7343-31) c603 tan capacitor 47uf,25v,±10% 27-47021-0...

  • Page 37

    Designator description part type part number footprint heat shrinking tube Φ 1 78-000010-0 metal parts for tp901 tem. Sw clamper 65mn hrc48-52 66-018005-0 for tp902 tem. Sw clamper 65mn hrc48-52 66-018005-0 for tp903 tem. Sw clamper 65mn hrc48-52 66-018005-0 for tp904 tem. Sw clamper 65mn hrc48-52 6...