NAD-T973-pwr-sm维修电路原理图.pdf

SERVICE MANUAL SERVICE MANUAL T973 C/AH T973 MKII-A MODEL: T973SERVICE MANUAL NAD 2008 NAD ELECTRONICS INTERNATIONAL TORONTO T973C/AH SEVEN CHANNEL AMPLIFIER T973C/AH SEVEN CHANNEL AMPLIFIER WITH STANDBY BOARD ADDENDUM SEVEN CHANNEL AMPLIFIER WITH STANDBY BOARD ADDENDUM RadioFans.CN 收音机爱 好者资料库 ALIGNMENT PROCEDURE (T973) 2004 2005 A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be controlled within 0+/-3mV. If its found to be out of this range, change the TL084BCD to get it to meet the requirement. B. IDLING CURRENT The idling current at the final stage of the unit should be set to about 40mA+/-10mA. Adjust RV102 (As marked as “Idling Current ADJ” in the enclosed drawing below) to control the voltage between Idling current Test point 1 and 2 to be 8mV +/- 2mV. Preheat the unit for 10 to 15 minutes, and then readjust to 8mV +/- 2mV. (Please note: The idling current must be adjusted when all modules are assembled into the unit.) C. ISC SENSITIVITY Adjust Pot RV104 (as marked as “ISC SENS ADJ” in the below drawing) to get the voltage across “ISC SENS TEST POINT” and AGND to be 0mV+/-10mV. (Please note that the ISC should be adjusted when all modules are assembled into the unit. Its not possible to get 0V +/-10mV if the modules are not assembled. D. THERMAL SENSE ADJUSTMENT The adjustment should be always done when the T973 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 to heat up the unit excessively) At ambient temperature of 25 C degree and when the unit is just turned on (still in cool condition), adjust the pot RV103 (as marked as “THERMAL SENS ADJ” in the below drawing) to get voltage across the THERMAL TEST POINT and AGND to be 750mV +/-10mV. While the ambient temperature is different, the voltage will vary as well. There is a relation between the temperature and voltage, that is; if the ambient temperature is 20 degree C, the voltage should be 850mV+/-10mV; if the ambient temperature is 30 degree C, the voltage should be adjusted to 650mV+/-10mV, etc. E. Fan Cut Off Point Adjustment Note: This Fan cut off function does not appear on PCB V10.0, V11.0 or MKII-A version but only appeared on PCB V12.0. Run the unit for all 7 channels at 1 kHz, 4ohms load, and 250mW output. Do this adjustment when the unit heats up, for example; run the unit at all 7 channels at 50W/4ohms for 10 minutes. Then adjust Pot RV201 on power supply board so the voltage at Pin14 of IC203 just changes from negative to positive (to get the fans just start turning). Then turn off the input signal and monitor if fans will stop within 30 seconds, then turn on the input signal again to see if the fans start turning immediately. Page 2 RadioFans.CN 收音机爱 好者资料库 ALIGNMENT PROCEDURE (T973) 2006 T973 MKII-B A. THERMAL SENSE ADJUSTMENT Always perform this adjustment when the T973 is in a cool condition such that the temperature inside the unit should be almost same as the ambient temperature. For this adjustment, first disconnect the plug from connector P208B that connects the transformer and power board in order to avoid the idle currents of the amplifiers from heating up the T973 excessively. At an ambient temperature of 25 degrees C and when the unit is just turned on, adjust the potentiometer RV103 (as marked as “Thermal Sens ADJ” in Figure 1) for a reading of 750mV+/-10mV across the THERMAL TEST POINT and AGND. After all THERMAL SENSE adjustments are complete, reattach the plug to connector P208B. NOTES: There is an inverse relation between the temperature and voltage. At different ambient temperatures, the THERMAL TEST POINT voltage should vary. For example; for an ambient temperature is 20 degrees C, the THERMAL TEST POINT voltage should be 850mV+/-10mV, and for an ambient temperature is 30 degrees C, the THERMAL TEST POINT voltage should be adjusted to 650mV+/-10mV. Ambient Celsius Ambient Fahrenheit THERMAL TEST POINT H39T97300001 to H47T97301586 and from H4ZT97301587 to H5ZT97302129. RadioFans.CN 收音机爱 好者资料库 EXPLODED VIEW PARTS LIST REF.NO PART NO.DESCRIPTIONQty.REF.NOPART NO.DESCRIPTIONQty. C00166-010001-0 Chassis1F00577-001007-1Power Button Bezel1 C00266-010006-0 Bracket 11F00676-003001-0LED Lens9 C00301-97306-00 Assembled Connection PCB1 C00466-010008-0 Bracket 32T00166-010002-0Top Cover1 C00501-97302-00 Assembled PSU PCB1 C00670-010003-0 Heatsink 310S00166-010003-1Subfacia1 C00769-010008-0 Bus Bar 2061S00275-005001-0LED Sleeve9 C00869-010007-0 Bus Bar 2051S00311-01101-20Power Switch1 C00969-010005-0 Bus Bar 2031S00401-97303-00Assembled Protect Softclipping Board1 C01069-010006-0 Bus Bar 2041S00501-97308-00Assembled Power Switch Board1 C01169-006001-0 Bus Bar 2011S00601-97307-00Assembled Power LED Board1 C01269-010004-0 Bus Bar 2021 C01370-010002-0 Heatsink 24R00167-010001-0Rear Panel (C Version) or1 C01475-010002-0 Cushion467-010006-0Rear Panel (AH Version)1 C01568-010001-0 Spacer Support (1)5R00266-010010-0Bracket 62 C01601-97305-01 Assembled Standby PCB1R00311-05202-10Switch (S402)1 C01775-010001-0 Capacitor Holder1R00411-05402-00Switch (S401)1 C01866-010007-0 Bracket 27R00517-07001-0012V Trigger In Jack1 C01970-010001-1 Heatsink 17R00617-07003-01AC Inlets1 C02067-010002-2 Bracket 47R00720-20000-03Fuse Holder 1 C02178-005005-0 Insulated Cushion4R00801-97304-00Assembled Trigger PCB1 C02271-001001-0 Bindding Post7R00968-010002-0Spacer Support (2)2 C02369-010003-0 Pin7R01071-003002-0Grd. Post Cap1 C02417-01001-10 RCA7R01171-010001-0Grd. Post Bolt1 C02573-010001-0 Rotate Knob7 C02609-01502-00 Pot7000161-023106-0Self Screw STB3X668 C02701-97301-00 Assembled AMP Module PCB7000261-023506-0Machine Screw MB3X65 C02866-005009-0 TR Clamper4000361-023108-0Self Screw STB3X863 C02985-010001-0 Spacer Support42000461-033106-0Self Screw STP364 C03066-010005-0 Transformer Bracket1000561-023208-0Self Screw BTB3X863 C03118-97132-00 Transformer (Toroid) or1000661-083512-0Machine Screw MPW3X121 18-97132-01 Transformer (Gloria)1000761-083518-0Machine Screw MPW3X183 C03266-010004-0 Metal Disc1000861-024108-0Self Screw STB4X810 C03394-010001-0 Transformer (Toroid) Label or1000961-084108-0Self Screw STPW4X87 94-010005-0 Transformer (Gloria) Label001061-045215-0Self Screw TB5X1512 C03475-010003-0 Insulated Cell1001164-110110-0Bolt M10X1101 C03535-01212-00 Fan3001263-011020-0Washer, GB97.1-85, 101 C03668-010003-0 Fan Cover3001363-021030-0Spring Washer 10 GB93-871 C03775-010004-1 Foot (Big)2001462-011002-0Nut, M10 GB6170-861 C03875-001008-0 Foot (Small)2001562-010302-0Nut, M3, GB6170-864 C03979-008001-0 Foot Pad4001663-020308-0Spring Washer, 3mm4 C04066-010009-0 Bracket 51001763-010303-0Washer, 3mm 4 C04101-97301-10 Assembled AMP MKI V10/11 7 0018 61-013206-0 Bolt 14 001963-030410-0Serrated Lock Washer 2 F00167-010003-0 Fascia1002062-010402-0Nut M4 GB6170-861 F00267-010005-0 End Cap (R)1002161-063108-0STF3X82 F00367-010004-0 End Cap (L)1002261-223514-0Machine Screw MB3X1428 F00477-009003-1 Power Button1002361-023215-0Self Taping Screw BTB3X1542 C041 01-97301-11 Assembled AMP MKIIA C041 01-97301-12 Assembled AMP MKIIB(2006) Page 17 RadioFans.CN 收音机爱 好者资料库 ELECTRICAL PARTS LIST REF. NO.PART NO. 16-97301-00AMP Raw PCB 01-97301-00AMP PCB with Components 01-97301-10Assembled AMP Module DIODES D101, D102, D103, D104, D105, D106, D107, D108, D109, D172, D173, D174, D175, D176, D177, D178, D179, D180, D184, D185 33-44148-021N4148Switch Diode D18733-25404-001N5404Rectifier Diode D18233-14709-004.7V1/2WZener Diode D18833-16809-006.8V1/2WZener Diode D181, D18333-40021-00BAV21Switch Diode TRANSISTORS Q139, Q14131-01312-002SA1312-GRTransistor Q138, Q14031-03324-002SC3324-GRTransistor Q103, Q113, Q131, Q132, Q133, Q161, Q162 31-00970-002SA970-GRTransistor Q118, Q17131-04403-002N4403Transistor Q107, Q108, Q13531-01815-002SC1815-GRTransistor Q109, Q110, Q13631-01015-002SA1015-GRTransistor Q116, Q13431-02240-002SA2240-GRTransistor Q126, Q12831-01943-002SA1943-OTransistor Q125, Q12731-05200-002SC5200-OTransistor Q13031-00369-002SK369-GRTransistor or 31-00170-00or 2SK170-BLTransistor Q12431-01837-002SA1837Transistor Q123, Q19131-04793-002SC4793Transistor Q115, Q117, Q12131-03423-002SC3423-OTransistor Q114, Q12231-01360-002SA1360-OTransistor Q111, Q112, Q13731-01016-002SA1016-KG-AATransistor Q101, Q102, Q105, Q10631-02362-002SC2362-KG-AATransistor Q11931-00006-00MPSA06Transistor Q12031-00056-00MPSA56Transistor ICS CB10103-67090-0067L090IC, Thermal Circuit Break IC10403-00082-00TL082DIC, Dual OP-AMP IC10303-00084-01TL084BCNIC, Quad OP-AMP IC10203-07812-20NJM78M12FAIC, Regulator IC10103-07912-20NJM79M12FAIC, Regulator RESISTORS R1G107-90101-01100ohms08055%Chip Resistor R10F07-90472-014.7kohms08055%Chip Resistor R10K, R10M07-90103-0110kohms08055%Chip Resistor R10G, R10H, R10N, R10S07-90223-0122kohms08055%Chip Resistor R10P, R10T07-90104-01100kohms08055%Chip Resistor R19207-22209-0522ohms1/6W0.5%Metal Film Resistor R16307-22239-0522ohms31/6W0.5%Metal Film Resistor R13507-20330-0033ohms1/6W5%Metal Film Resistor R10B, R10C, R111, R113, R114, R119, R120, R122, R195 07-20101-00100ohms1/6W5%Metal Film Resistor R12507-21000-00100ohms1/6W1%Metal Film Resistor R115, R11707-20181-00180ohms1/6W5%Metal Film Resistor R110, R124, R144, R162, R10707-20221-00220ohms1/6W5%Metal Film Resistor R187, R10D07-24700-00470ohms1/6W1%Metal Film Resistor R166, R16907-21001-051kohms1/6W0.5%Metal Film Resistor R103, R106, R10A, R109, R123, R133, R164, R165, R199 07-20102-001kohms1/6W5%Metal Film Resistor R14307-20152-001k5ohms1/6W5%Metal Film Resistor R10107-21501-001k5ohms1/6W1%Metal Film Resistor R10207-22001-002kohms1/6W1%Metal Film Resistor R127, R12907-20222-002k2ohms1/6W5%Metal Film Resistor R17507-22211-002k21ohms1/6W1%Metal Film Resistor AMP MODULE BOARD DESCRIPTION Page 18 RadioFans.CN 收音机爱 好者资料库 ELECTRICAL PARTS LIST REF. NO.PART NO.DESCRIPTION R11207-23301-003k3ohms1/6W1%Metal Film Resistor R13207-20392-003k9ohms1/6W5%Metal Film Resistor R105, R19607-20562-005k6ohms1/6W5%Metal Film Resistor R19707-20682-006k8ohms1/6W5%Metal Film Resistor R104, R174, R177, R18907-20103-0010kohms1/6W5%Metal Film Resistor R12607-22781-002k78ohms1/6W1%Metal Film Resistor R134, R172, R173, R180, R181, R185, R10V 07-20203-0020kohms1/6W5%Metal Film Resistor R116, R11807-20223-0022kohms1/6W5%Metal Film Resistor R12107-23302-0033kohms1/6W1%Metal Film Resistor R19307-20473-0047kohms1/6W5%Metal Film Resistor R10E07-20753-0075kohms1/6W5%Metal Film Resistor R136, R17807-20513-0051kohms1/6W5%Metal Film Resistor R168, R18207-20104-00100kohms1/6W5%Metal Film Resistor R18307-20204-00200kohms1/6W5%Metal Film Resistor R130, R131, R167, R171, R188, R190, R191 07-20224-00220kohms1/6W5%Metal Film Resistor R12807-20274-00270kohms1/6W5%Metal Film Resistor R18607-20394-00390kohms1/6W5%Metal Film Resistor R170, R19807-20474-00470kohms1/6W5%Metal Film Resistor R17907-20514-00510kohms1/6W5%Metal Film Resistor R161, R17607-20105-001Mohms1/6W5%Metal Film Resistor R10807-20475-004.7Mohms1/6W5%Metal Film Resistor R137, R138, R141, R142, R153, R154 07-20101-10100ohms1/4W5%Metal Film Resistor R139, R14007-20681-10680ohms1/4W5%Metal Film Resistor R14707-50102-001kohms1/4W5%Fusible Resistor R148, R18407-30101-00100ohms1/2W5%Metal Oxide Film Resistor R145, R14607-30562-005k6ohms1/2W5%Metal Oxide Film Resistor R149, R150, R151, R15207-30229-012.2ohms1W5%Metal Oxide Film Resistor R15907-30339-103.3ohms1W5%Metal Oxide Film Resistor R16007-30279-022.7ohms2W5%Metal Oxide Film Resistor R155, R156, R157, R15807-60108-060.1ohms5W5%Cement Resistor R19407-40507-040.05ohms3W5%Metal Oxide Film Resistor CAPACITORS C13305-10013-0010pF1KV10%Ceramic Capacitor C118, C11905-15013-0015pF1KV10%Ceramic Capacitor C10105-22013-0022pF1KV10%Ceramic Capacitor C13205-40013-0040pF1KV10%Ceramic Capacitor CNI5, CNI605-47013-0047pF1KV10%Ceramic Capacitor C121, C12205-68013-0068pF1KV10%Ceramic Capacitor C135, C13805-10113-01100pF1KV10%Ceramic Capacitor C13105-18113-00180pF1KV10%Ceramic Capacitor C11205-10213-02220pF1KV10%Ceramic Capacitor C113, C116, C13405-47113-00470pF1KV10%Ceramic Capacitor C12626-22351-0122nF, 0805(X7R)50V10%Ceramic Capacitor SMD C114, C11526-10451-11100nF, 0805(X7R)50V10%Ceramic Capacitor SMD C1G126-47421-01470nF, 0805(X7R)25V10%Ceramic Capacitor SMD C105, C10925-10361-0410nF, CL23B63V10%Polyester capacitor C127, C12825-10312-0210nF, CL23B100V5%Polyester capacitor C18025-10322-0210nF, CL23B250V5%Polyester capacitor C129, C141, C142, C143, C14425-10422-01100nF, CL23B250V5%Polyester capacitor C136, C13925-10461-00100nF, CL23B63V10%Polyester capacitor C130, C123, C102, C10625-10412-02100nF, CL23B100V10%Polyester capacitor C11025-47461-01470nF, CL23B63V10%Polyester capacitor C161, C162, C164, C16306-10951-031uF, CD26350V20%ALU Electrolytic Capacitor C12506-47951-054.7uF, CD26350V20%ALU Electrolytic Capacitor C104, C10806-10051-0610uF, CD26350V20%ALU Electrolytic Capacitor C124, C172, C17306-22021-0122uF, CD26325V20%ALU Electrolytic Capacitor C111, C17106-47021-0147uF, CD26325V20%ALU Electrolytic Capacitor C103, C107, C137, C14006-10121-02100uF, CD26325V20%ALU Electrolytic Capacitor INDUCTORS L10108-01079-010.7uHInductor Page 19 RadioFans.CN 收音机爱 好者资料库 ELECTRICAL PARTS LIST REF. NO.PART NO.DESCRIPTION RELAYS RL10112-03101-03Relay POTS RV10209-02301-01300ohmsSEMI POT RV10309-02501-02500ohmsSEMI POT RV10409-02503-0250kohmsSEMI POT RV10109-01502-005kohms, RK09K1110482-5KAPOT FUSES F101, F10220-12632-00T6.3AL/250VFuse F101, F10220-20000-06LS-PTF-78 or CQ- 200C, no cover Fuse Holder CONNECTORS J10117-01001-10AV-8.4-14whiteno grounding RCA J10271-001001-0Binding Post G1G132-28042-00GND-8Ground Solder Tap P10313-12506-0210-89-4062Connector P101A, P102A13-13909-0041662-0031Connector 16-97302-00Power Supply Raw PCB 01-97302-00 Power Supply PCB with components DIODES D201, D202, D203, D204, D205, D207, D208, D209 33-44148-021N4148Switch Diode D20633-24007-001N4007Rectify Diode D213, D214, D215, D216, D217, D218, D219 33-14309-004.3V1/2WZener Diode D21233-15109-005.1V1/2WZener Diode QT01, QT02, QT03, QT0433-83008-0030TPS08SCR BR201, BR202, BR203, BR20733-30142-00DB104GBridge BR204, BR205, BR20633-32562-00KBJ2506Bridge TRANSISTORS Q20931-00872-002SA872-AETZTransistor Q207, Q20831-01775-002SC1775-AETZTransistor Q212, Q21631-00647-002SD647-AWCTransistor Q203, Q210, Q214, Q223, Q224, Q225, Q226, Q228, Q229, Q230 31-01815-002SC1815-GRTransistor Q204, Q211, Q21531-01015-002SA1015-GRTransistor Q213, Q217, Q22731-00667-002SD667-AWCTransistor Q202, Q205, Q218, Q219, Q22031-02690-00KSC2690AYSTUTransistor Q201, Q20631-01220-00KSA1220AYSTUTransistor ICS IC20503-07805-00L7805CVIC, Regulator IC20103-07812-00L7812CVIC, Regulator IC20203-07912-00L7912CVIC, Regulator IC20403-07421-00SN74HC21NGate IC IC20303-00084-00TL084CNIC, Quad OP-AMP RESISTORS R238, R240, R247, R24907-20470-0047