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NAD T955 C Service Manual

Five channel amplifier
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  • Page 2: Table Of Contents

    CONTENTS FRONT PANEL/REAR PANEL VIEW SPECIFICATIONS ALIGNMENT PROCEDURE/ALIGNMENT POINTS WIRING DIAGRAM SCHEMATIC DIAGRAM 7-12 PCB LAYOUT 13-19 ELECTRICAL PARTS LIST 20-33 EXPLODED VIEW 34-36 EXPLODED VIEW PARTS LIST PACKING DIAGRAM SERVICE SAFETY PRECAUTIONS 1. Replacing the Fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE.
  • Page 3 - 3 -...

  • Page 4: Specifications

    SPECIFICATIONS ≥100 W (20.0 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) Rated Distortion ≤0.03% (THD 20 Hz – 20 kHz) ≥130 W Clipping power (maximum continuous power per channel).

  • Page 5: Alignment Procedure

    ALIGNMENT PROCEDURE A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-20mV. B. IDLING CURRENT The idling current in the output stage of the poweramp should be set to 25mA+/-5mA per pnp-npn transistor pair( This means the mid point voltage is 4mV with down limit of 3mV and up limit of 5mV).

  • Page 6: Wiring Diagram

    WIRING DIAGRAM ISC1 ISC1 ISC1 ISC1 ISC1 VSS1 VSS1 VSS1 VSS1 VSS1 AGND1 AGND1 AGND1 AGND1 AGND1 AGND1 AGND1 AGND1 AGND1 AGND1 VPP1 VPP1 VPP1 VPP1 VPP1 ACOFF1 ACOFF1 ACOFF1 ACOFF1 ACOFF1 DGND DGND DGND DGND DGND LED1 LED1 LED1 LED1 LED1 P101A...

  • Page 7: Schematic Diagram

    SCHEMATICS DIAGRAM R1H8 R1H8 P103A P103A 3.9K 3.9K EGND D129 D129 D127 D127 Ground Solder Tap Ground Solder Tap 1N4148 1N4148 3.3V 3.3V /1/2W D102 D102 Q101 Q101 R103 R103 1N5404 1N5404 AGND KSC2690 KSC2690 +15VA D106 D106 C103 C103 /1/2W D105 D105...
  • Page 8 SCHEMATICS DIAGRAM Q203 Q203 F201 F201 R209 R209 R210 R210 MPSA92 MPSA92 T6.3AL/250V T6.3AL/250V R205 R205 F203 F203 P201B P201B BR201 BR201 BR202 BR202 T6.3AL/250V T6.3AL/250V R207 R207 KBU8D KBU8D KBU8D KBU8D P202B P202B ISC1 TH201 TH201 C204 C204 BT151X-500R BT151X-500R C208 C208...
  • Page 9 SCHEMATICS DIAGRAM R318 R318 +5VD +5VD R319 R319 R322 R322 P701A P701A P301A P301A Q315 Q315 2.2K 2.2K 2N4403 2N4403 GREEN DGND R323 R323 Q316 Q316 STBYLED Q314 Q314 DTC114ESA DTC114ESA 2N4401 2N4401 D701 D701 3PIN2.54-A130B 3PIN2.54-A130B 3P2.54-C 3P2.54-C BL-BJLB4204 BL-BJLB4204 Q312 Q312...
  • Page 10 SCHEMATICS DIAGRAM W501 W501 TR501 TR501 10mm JUMPER 10mm JUMPER W502 W502 15mm JUMPER 15mm JUMPER S601 S601 SW SPST SW SPST P504B P504B TV-8 RATING TD050-E103P TD050-E103P 5PIN2.54-C 5PIN2.54-C POWER SWITCH BOARD FROM POWER SUPPLY BOARD RL501 RL501 D501 D501 P505B P505B...
  • Page 11 SCHEMATICS DIAGRAM S401 S401 SSSU122NA1 SSSU122NA1 S402 S402 SSSU122NA1 SSSU122NA1 P401A P401A +5VD STBY DGND 4PIN2.54-A300B 4PIN2.54-A300B J401 J401 PY301-030-100 PY301-030-100 - 11 -...

  • Page 12: Schematic Diagram

    32.8V/2A at the low-voltage windings. Thermal protector mounted on secondary P/N: TI-053035 AU Iss 2 side but leads close to primary leads NAD: T955 Diameter <130mm Center filled and 10mm hole Height <88mm └cULus logo + E115159 CE Logo ┘...

  • Page 13: Pcb Layout

    PCB LAYOUT AMP BOARD - COMPONENT SIDE ISC ADJ. DC OFFSET ADJ. R170 C126 AGND C156 AGND R169 R1K1 R1K2 RV101 D136 R135 OFFSET W104 T955AMP-VM1.0 RV102 D134 R143 C119 C117 2006-08-18 Q110 R168 IC103 D135 C128 D110 R150 R137 P102A C125 Q117...
  • Page 14 PCB LAYOUT PSU BOARD - COMPONENT SIDE NAD T955POW P201B,P202B,P203B,P204B and R235 P201B ALL FUSES ARE T6.3AL/250V P205B P205B both from Main Transformer P203B P207B P209B F220 F204 F202 F215 F216 F207 F205 F218 F206 P211B W202 D205 D201 +5.5V...

  • Page 15: Display Board

    PCB LAYOUT DISPLAY BOARD C302 C304 R318 +5VD W303 T955 FRONT PANNEL DISPLAY BOARD D308 STBYLED VM1.0 08/18/2006 +5VD LED1 LED5 LED4 LED3 LED2 LED CLASSIFICATION D302 D303 D304 D305 D306 DGND P302A - 15 -...
  • Page 16 PCB LAYOUT STANDBY BOARD RL501 P501B P504B D501 W505 P505B P502B - 16 -...
  • Page 17 PCB LAYOUT TRIGGER BOARD S401 S402 P401A TO PSU BOARD T955 TRIGGER BOARD VM1.0 08/18/2006 - 17 -...
  • Page 18 PCB LAYOUT POWER LED BOARD T955 POWER LED BOARD VM1.0 08/18/2006 - 18 -...

  • Page 19: Pcb Layout

    PCB LAYOUT POWER SWITCH BOARD T955 SWITCH BOARD VM1.0 08/18/2006 - 19 -...

  • Page 20: Electrical Parts List

    ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT AH P/N 01-95501-10 C P/N 01-95501-20 PCB1 BOARD (AMP) DIODE D101 Zener Diode 15V, 1/2W 33-11500-00 DAX/.300X.080/.031 D102 Recti Diode 1N5404 33-25404-01 DAX/.600X.200/.059 D103 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031 D104 Switch Diode 1N4148 33-44148-00...
  • Page 21 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Q117 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB Q118 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB Q119 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q120 Transistor 2SB647-ACTZ 31-00647-00 TO92/100/ECB Q121 Transistor 2SD667-ACTZ 31-00667-00 TO92/100/ECB Q122 Transistor 2SA1930 31-01930-00 TO220AB/BCE Q122 Transistor KTB1369-Y...
  • Page 22 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT IC104 Voltage ref AZ431 03-00431-00 TO92/100/123 PC101 PHOTOCOUPLER PC817A 03-00817-01 PHOTOCOUPLER_1 PC102 PHOTOCOUPLER PC817A 03-00817-01 PHOTOCOUPLER_1 RESISTOR R101 Metal Film Resistor 680Ω, 1/6W, 5% 07-20681-50 AX/.200X.080/.031 R102 Metal Film Resistor 680Ω, 1/6W, 5% 07-20681-50 AX/.200X.080/.031...
  • Page 23 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R156 Metal Film Resistor 39KΩ, 1/6W, 5% 07-20393-50 AX/.200X.080/.031 R157 Metal Film Resistor 220KΩ, 1/6W, 5% 07-20224-50 AX/.200X.080/.031 R158 Metal Film Resistor 220KΩ, 1/6W, 5% 07-20224-50 AX/.200X.080/.031 R159 Metal Film Resistor 33Ω, 1/6W, 5% 07-20330-50 AX/.200X.080/.031...
  • Page 24 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R1E6 Metal Film Resistor 1megΩ, 1/6W, 5% 07-20105-50 AX/.200X.080/.031 R1E7 Metal Film Resistor 36Ω, 1W, 1% 07-23609-01 AX/.600X.125/.039 R1E8 Metal Film Resistor 2.2KΩ, 1/6W, 5% 07-20222-50 AX/.200X.080/.031 R1E9 Metal Film Resistor 1megΩ, 1/6W, 5% 07-20105-50 AX/.200X.080/.031...
  • Page 25 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C117 ALU Electrolytic Capacitor 06-10051-01 CPCYL1/D.200/LS.200/.031 10uF/50V, 20%, 105 C118 ALU Electrolytic Capacitor 10uF/50V, 20%, 105 06-10051-01 CPCYL1/D.200/LS.200/.031 C119 ALU Electrolytic Capacitor 1uF/50V, 20%, 105 06-10951-03 CPCYL/D.200/LS.200/.031 C120 ALU Electrolytic Capacitor 06-10951-03 CPCYL/D.200/LS.200/.031 1uF/50V, 20%, 105...
  • Page 26 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C170 ALU Electrolytic Capacitor 10uF/50V, 20%, 105 06-10051-01 CPCYL1/D.200/LS.200/.031 C171 ALU Electrolytic Capacitor 06-10051-01 CPCYL1/D.200/LS.200/.031 10uF/50V, 20%, 105 C1G1 Polyester capacitor 100nF, 10%, 63V 25-10461-00 RAD/.300X.150/LS.200/.035 INDUCTOR L101 Inductor 0.7uH, horizontal type 08-01079-01 RAD/.850X.450/LS.700/.059 L102...
  • Page 27 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT BR208 BRIDGE KBU8D 33-30822-01 BRIDGE/1.010X.290/.063 BR209 BRIDGE KBU8D 33-30822-01 BRIDGE/1.010X.290/.063 BR210 BRIDGE KBU8D 33-30822-01 BRIDGE/1.010X.290/.063 BR211 BRIDGE DB104G 33-30142-00 BRIDGE/.400X.500/.047 TRANSISTOR Q201 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB Q202 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB Q203 Transistor...
  • Page 28 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R229 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-50 AX/.200X.100/.031 R230 Metal Film Resistor 100Ω, 1/6W, 5% 07-20101-50 AX/.200X.100/.031 R231 Metal Film Resistor 22KΩ, 1/6W, 5% 07-20223-50 AX/.200X.100/.031 R232 Metal Film Resistor 22KΩ, 1/6W, 5% 07-20223-50 AX/.200X.100/.031...
  • Page 29 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT C216 ALU Electrolytic Capacitor 06-10012-01 CPCYL1/D.200/LS.200/.031 10uF/100V, 20%, 105 C217 ALU Electrolytic Capacitor 10uF/100V, 20%, 105 06-10012-01 CPCYL1/D.200/LS.200/.031 C218 ALU Electrolytic Capacitor 10uF/100V, 20%, 105 06-10012-01 CPCYL1/D.200/LS.200/.031 C219 Polyester capacitor 100nF, 10%, 100V 25-10412-02 RAD/.300X.150/LS.200/.037...
  • Page 30 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT P203B HOUSING 5PIN3.96-C 13-23905-30 BLKCON.156/VH/TM1SQS/W.355/5 MOLEX 2145/3215 TOP BLKCON.156/MOLEX2145/3215/TOP P204B CONNECTOR 13-25009-00 ENTRY/9PIN ENTRY/9 P205B HOUSING 5PIN3.96-C 13-23905-30 BLKCON.156/VH/TM1SQS/W.355/5 MOLEX 2145/3215 TOP BLKCON.156/MOLEX2145/3215/TOP P206B CONNECTOR 13-25009-00 ENTRY/9PIN ENTRY/9 P207B HOUSING 5PIN3.96-C 13-23905-30 BLKCON.156/VH/TM1SQS/W.355/5...
  • Page 31 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT W201 JUMPER 10mm 21-06000-00 10mm W202 JUMPER 15mm 21-06000-00 15mm BUS201 BUSBAR 69-010001-0 01-95503-00 PCB3 BOARD ( DISPLAY) DIODE D301 BL-BUBB4274 A 33-50565-00 LED/ANODE/D.200/LS.200/.039 D301 BL-BUBB4274 B 33-50565-10 LED/ANODE/D.200/LS.200/.039 D301 BL-BUBB4274 C 33-50565-20 LED/ANODE/D.200/LS.200/.039...
  • Page 32 ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT R310 Metal Film Resistor 150Ω, 1/6W, 5% 07-20151-50 AX/.200X.100/.031 R311 Metal Film Resistor 150Ω, 1/6W, 5% 07-20151-50 AX/.200X.100/.031 R312 Metal Film Resistor 1KΩ, 1/6W, 5% 07-20102-50 AX/.200X.100/.031 R313 Metal Film Resistor 150Ω, 1/6W, 5% 07-20151-50 AX/.200X.100/.031...

  • Page 33: Electrical Parts List

    ELECTRICAL PARTS LIST DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT Connector Ribbon L=95mm 14-95501-03 Connector Ribbon L=95mm 14-95501-03 JUMPER W501 JUMPER 10mm 21-06000-00 10mm W502 JUMPER 15mm 21-06000-00 15mm W503 JUMPER 7.5mm 21-10750-00 7.5mm W504 JUMPER 10mm 21-10101-00 10mm W505 JUMPER 7.5mm 21-10750-00...

  • Page 34: Exploded View

    EXPLODED VIEW A001 S003 S004 S002 A002 A004 S001 A003 S001 A006 A005 S005 S001 S001 - 34 -...
  • Page 35 EXPLODED VIEW TR03 TR02 S007 S008 S009 TR01 TR04 TR05 S007 S006 - 35 -...

  • Page 36: Exploded View

    EXPLODED VIEW S010 T001 S014 S010 S014 S016 C003 C007 C004 S010 S010 C006 C005 S013 S017 S015 S015 S010 C008 R001 S010 C009 C013 S002 F010 F002 C012 F008 S010 F003 S001 F001 S010 B001 C001 F005 S001 C002 S001 F006 S010...

  • Page 37: Exploded View Parts List

    EXPLODED VIEW PARTS LIST REF.NO PART NO. DESCRIPTION Qty. REF.NO PART NO. DESCRIPTION Qty. A001 70-062005-1 Main Heatsink F005 77-062002-0 Power Button Bezel AMP MODULE PCB no outputs (AH) A002 01-95501-10 F006 76-062001-0 Led Lens no outputs 01-95501-20 AMP MODULE PCB F007 75-062001-0 Sleeve A003...

  • Page 38: Packing Diagram

    T955 PACKING DIAGRAM REF.NO PART NO. DESCRIPTION 88-062001-1 carton box 88-062002-0 Bottom Polyfoam 15-10230-20 AC Cord 90-062004-0 EPE PAD 00-95500-20 T955 Unit 90-062002-0 Non-woven Cloth 90-062003-0 EPE Bag 90-062001-0 Polyfbag 90-062004-0 EPE PAD 89-062003-0 Top Polyfoam S30-49550-00 Instruction Manual - 38 -...

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