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NAD T977 C/AH Service Manual
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NAD T977 C/AH Service Manual

NAD T977 C/AH Service Manual

Seven channel amplifier
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T977 C/AH
SEVEN CHANNEL AMPLIFIER

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Summary of Contents for NAD T977 C/AH

  • Page 1 T977 C/AH SEVEN CHANNEL AMPLIFIER...

  • Page 2: Replacing The Fuses

    CONTENTS FRONT PANEL/REAR PANEL VIEW． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ．3 SPECIFICATIONS．...
  • Page 3 - 3 -...

  • Page 4: Specifications

    SPECIFICATIONS ≥140 W (21.5 dBW) CONTINUOUS AVERAGE POWER OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz – 20 kHz, both channels driven, with no more than rated distortion) ≤0.03% Rated Distortion (THD 20 Hz – 20 kHz) ≥170 W(22.3 dBW) Clipping power (maximum continuous power per channel).
  • 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 to avoid that the Idling current heats up the unit excessively) At ambient temperature of 25 C degrees and when the unit is just turned on (still in cool condition), adjust the pot RV103(as marked as “Thermal Sense ADJ”...
  • 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.
  • Page 7 WIRING DIAGRAM TRIGGER BOARD CHANNEL 1 CHANNEL 2 CHANNEL 3 CHANNEL 4 CHANNEL 5 CHANNEL 6 CHANNEL 7 P102A P102A P102A P102A P102A P102A P102A P102A P102A P102A P102A P102A P102A P102A MOLEX 41662 MOLEX 41662 MOLEX 41662 MOLEX 41662 MOLEX 41662 MOLEX 41662 MOLEX 41662...
  • Page 8 SCHEMATICS DIAGRAM R1E1 R1E1 +12V 3.3K 3.3K F101 F101 D135 D135 +62V +62V T6.3AL/250V T6.3AL/250V 1N5404 1N5404 R1E2 R1E2 ISCTRIG R1A7 R1A7 -12V D131 D131 D132 D132 R1A3 R1A3 OFFSET 0.05 0.05 OFFSET 470K 470K BAV21 BAV21 Q145 Q145 4.7V 4.7V /1/2W R1A8...
  • Page 9 SCHEMATICS DIAGRAM +12V -12V C169 C169 D107 D107 R1N5 R1N5 R169 R169 D106 D106 C139 C139 R1H1 R1H1 D110 D110 R172 R172 100nF 100nF /250V +68V C171 C171 4.7K 4.7K +68V BAV21 BAV21 R1N1 R1N1 4.7uF 4.7uF 47pF 47pF /1KV IC101 IC101 330K...
  • Page 10 SCHEMATICS DIAGRAM F201 F201 G2G1 G2G1 T1.6AL/250V T1.6AL/250V IC201 IC201 LM7812CT LM7812CT Ground Solder Tap Ground Solder Tap BR201 BR201 +12VD DB104G DB104G +18V +18V +18V C204 C204 Q205 Q205 R213 R213 C208 C208 10nF 10nF /100V C206 C206 2SC4793 2SC4793 +70V +70V...
  • Page 11 SCHEMATICS DIAGRAM LED Pin1 Red Pin3 Amber Pin4 Blue +5VD STBYLED is +0.7V at normal working condition and is +5V at STNADBY mode. PROT1-PROT7 each is +10.5V at normal working condition.When any channel is in protection,the relevant PROT will be at -10.5V. STBYLED Q329 Q329...
  • Page 12 SCHEMATICS DIAGRAM SCLED SCLED R405 R405 SCP_4 SCP_4 D401 D401 R401 R401 +62V_4 +62V_4 R409 R409 26.1K 26.1K /1/2W C401 C401 /50V C402 C402 /50V D402 D402 R402 R402 R410 R410 -62V_4 -62V_4 26.1K 26.1K /1/2W S401 S401 R406 R406 SCN_4 SCN_4 SCP_3...
  • Page 13 SCHEMATICS DIAGRAM F501 F501 C505 C505 L501 L501 +5VD 10uH 10uH T1AL/250V T1AL/250V /Y Type D502 D502 P6KE200A P6KE200A D504 D504 1N5819 1N5819 C507 C507 C508 C508 C509 C509 R503 R503 TR501 TR501 100nF 100nF 100nF 100nF 220uF 220uF /16V D501 D501 FR107...
  • Page 14 SCHEMATICS DIAGRAM P601B P601B P602B P602B FLAT CONNECTOR SMD16 FLAT CONNECTOR SMD16 FLAT CONNECTOR SMD16 FLAT CONNECTOR SMD16 P603B P603B CONTACTS UPSIDE CONTACTS UPSIDE CONTACTS UPSIDE CONTACTS UPSIDE S10B-PH-SM3-TB S10B-PH-SM3-TB All capacitors are SMD0805 50V unless noted. All Elec. capacitors are 50V 20% unless noted. All Resistor are SMD0805 5% unless noted.
  • Page 15 SCHEMATICS DIAGRAM J901 J901 2PIN2.54-C 2PIN2.54-C - 15 -...
  • Page 16 PCB LAYOUT T977 AMP Board Upper - COMPONENT SIDE Q130 IC102 Q131 Q126 C126 Q128 CB101 Q129 Q145 L103 R177 R156 C129 C123 Q135 Q133 C170 R166 Q132 Q134 R1E2 C172 C171 R1E3 C122 R160 R159 R158 C124 C169 C125 R161 BUS101 R163...
  • Page 17 C258 C282 R218 Q209 C284 P 207A D236 C214 C225 C238 D204 G2G1 C228 R219 C231 R220 C239 C237 C227 C232 C291 T977 SEVEN CHANNEL AMPLIFIER DESIGNED BY:NAD T977 TEAM 2012/04/18 T977 POW Board Upper - SOLDER SIDE - 17 -...
  • Page 18 PCB LAYOUT T977 DISPLAY Board Upper - COMPONENT SIDE T977 DISPLAY BOARD VM1.0 2012/04/18 D309 D301 D302 D306 D303 D304 D305 D307 R350 D308 S301 Q316 Q319 Q308 Q322 Q315 Q301 Q302 Q318Q304 Q305 Q320 Q306 Q314 Q321 Q307 Q309 Q323 Q310 Q324...
  • Page 19 PCB LAYOUT T977 SOFTCLIPPING&TRIG Board Upper - COMPONENT SIDE S401 VM1.0 2012/04/26 R411 D403 D401 R409 R402 D402 R406 R405 R415 R407 R414 S401 D405 D404 R404 R401 R410 R403 R413 C404 C403 R408 J401 R412 T977 SOFTCLIPPING&TRIG BOARD C401 C402 P401B T977 SOFTCLIPPING&TRIG Board Upper - SOLDER SIDE...
  • Page 20 PCB LAYOUT T977 STBY Board Upper - COMPONENT SIDE T977 STBY Board Upper - SOLDER SIDE P506B C507 P504B C508 D505 L501 C506 IC502 R506 C509 T977 STANDBY Board VM2.0 2012/05/14 TR502 C505 D502 D501 ATTENTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE AND RATING D503...
  • Page 21 PCB LAYOUT T977 Connection Board Upper - COMPONENT SIDE P602B P601B P603B P624B C602 X602 C616 C606 C605 C603 X601 R609 R606 IC601 C615 C608 R611 R612 R613 R614 R615 R610 C614 C609 C613 C612 C611 C610 BUS601 BUS604 BUS602 BUS605 W601 BUS603...

  • Page 22: Electrical Parts List

    ELECTRICAL PARTS LIST 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...
  • Page 23 ELECTRICAL PARTS LIST 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 31-03423-00 TO126/90/ECB Q127 Transistor FMMTA92/MMBTA92/MMBTA92LT1 31-00092-01 SOT23 Q128 Transistor MJE340...
  • Page 24 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R125 Chip Resistor 680Ω,0805,1/8W,±5% 07-90681-01 SM/R_0805 R126 Chip Resistor 220Ω,0805,1/8W,±5% 07-90221-01 SM/R_0805 R127 Chip Resistor 4.7KΩ,0805,1/8W,±5% 07-90472-01 SM/R_0805 R128 Chip Resistor 1MΩ,0805,1/8W,±5% 07-90105-01 SM/R_0805 R129 Chip Resistor 1MΩ,0805,1/8W,±5% 07-90105-01 SM/R_0805 R130 Chip Resistor 1KΩ,0805,1/8W,±5%...
  • Page 25 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R194 Chip Resistor 150Ω,0805,1/8W,±5% 07-90151-01 SM/R_0805 R195 Chip Resistor 100KΩ,0805,1/8W,±5% 07-90104-01 SM/R_0805 R196 Metal Oxide Film Resistor 100Ω, 1/2W, 5% 07-30101-00 Pitch=15mm R197 Chip Resistor 20KΩ,0805,1/8W,±5% 07-90203-01 SM/R_0805 R198 Chip Resistor 100KΩ,0805,1/8W,±5% 07-90104-01 SM/R_0805...
  • Page 26 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT 10uF/50V, 20%, 105 ℃ C128 ALU Electrolytic Capacitor 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 25-47461-01 Pitch=5mm C132...
  • Page 27 ELECTRICAL PARTS LIST 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) (73-001003-0) Binding Post(Black) (73-001004-0) BDP CAP(Red) (73-001005-0) BDP CAP(Black) (73-001006-0) BP101 Shaft HPB59-1 (69-010009-0) Shaft HPB59-1 (69-001002-0) Binding Post HS4-C320-B009V1-P002 B...
  • Page 28 ELECTRICAL PARTS LIST 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 D228 Switch Diode 1N4148...
  • Page 29 ELECTRICAL PARTS LIST 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 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-50 AX/.200X.080/.031 R202...
  • Page 30 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R270 Metal Film Resistor 43KΩ, 1/6W, 1% 07-24302-50 AX/.200X.080/.031 R271 Metal Film Resistor 43KΩ, 1/6W, 1% 07-24302-50 AX/.200X.080/.031 R272 Metal Film Resistor 43KΩ, 1/6W, 1% 07-24302-50 AX/.200X.080/.031 R273 Metal Film Resistor 100Ω, 1/6W, 5% 07-20101-50 AX/.200X.080/.031...
  • Page 31 ELECTRICAL PARTS LIST 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 3300uF/35V, 20%, 105 ℃ C213 ALU Electrolytic Capacitor 06-33231-00 CPCYL1/D.900/LS.400/.062 3300uF/35V, 20%, 105 ℃ C214 ALU Electrolytic Capacitor 06-33231-00...
  • Page 32 ELECTRICAL PARTS LIST 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/.066 JUMPER W203 JUMPER 20mm 21-10201-00 20mm W204 JUMPER 25mm...
  • Page 33 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT φ5, Red Orange Blue D308 33-55236-00 φ5, Blue Red D309 33-50565-03 DYL/D.200/LS.100/.039 φ5, Blue Red, A D309 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 A1015, SOT23 31-01015-03 SOT23 Q302...
  • Page 34 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R336 Chip Resistor 10KΩ,0805,1/8W,±5% 07-90103-01 SM/R_0805 R337 Chip Resistor 10KΩ,0805,1/8W,±5% 07-90103-01 SM/R_0805 R338 Chip Resistor 10KΩ,0805,1/8W,±5% 07-90103-01 SM/R_0805 R339 Chip Resistor 10KΩ,0805,1/8W,±5% 07-90103-01 SM/R_0805 R340 Chip Resistor 10KΩ,0805,1/8W,±5% 07-90103-01 SM/R_0805 R341 Chip Resistor 10KΩ,0805,1/8W,±5%...
  • Page 35 ELECTRICAL PARTS LIST 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 IC501 Power controller IC TNY274PN 03-00274-00 DIP-8C IC502 Shunt Regulator TL431 03-00431-02 TO-92 PC501 Photocoupler PC817X1J000F 03-00817-06 DIP4 PC501 Photocoupler...
  • Page 36 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R615 Chip Resistor 10KΩ,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% 27-47021-02 CASE-D(7343-31) C605 Ceramic Chip Capacitor 22PJ,50V,0805,NPO 26-22051-01 SM/C_0805...
  • Page 37 ELECTRICAL PARTS LIST DESIGNATOR DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Φ1 Heat Shrinking Tube 78-000010-0 METAL PARTS Tem. SW Clamper 65Mn HRC48-52 66-018005-0 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.