McIntosh-MA2275-int-sm(1) 维修电路原理图.pdf

SERVICE MANUALPerformance Specifications . 2Notes . 2Rear Panel . 3Section Location . 4Block Diagram . 5 - 7Interconnection Diagram . 8 - 10Main Schematic and PCB. 11 - 16Control Schematic and PCB . 17 - 20Balanced Schematic and PCB . 21 - 22Volume/Tone Schematic and PCB . 23 - 26Data Schematic and PCB. 27 - 28Pushbutton Schematic and PCB . 29 - 30Amplifier Schematic and PCB. 31 - 34Power Supply Schematic and PCB. 35 - 38Meter Schematic and PCB . 39 - 40Backup PS Schematic and PCB . 41Terminal Schematic and PCB . 42Parts List . 43 - 48Exploded View and Parts List . 49 - 52Repacking Instructions . 53CONTENTSTUBEINTEGRATED AMPLIFIERRadioFans.CN 收音机爱 好者资料库PERFORMANCE SPECIFICATIONS21. The heavy lines on the schematic denote the primarysignal path.2. Unless otherwise noted, all voltages indicated on theschematics are measured under the following conditions:a. AC input at 120 volts, 50/60Hz.b. All voltages are +/-10% with respect to ground. Ahigh impedance (10 megaohm) voltmeter must be used.3. Unless otherwise specified:a. Resistor values are in ohms.b. Capacitor values are microfarads (uF).c. Inductor values are in microhenries (uH).4. On PC board drawings, Square pad indicates:a. Polarized Capacitors - Positiveb. Diodes - Cathodec. Others - Pin 15. WARNINGParts marked with the symbol have criticalcharacteristics. Use only replacement parts recom-mended by the manufacturer.NOTESPower OutputMinimum sine wave continuous average power output perchannel, both channels operating is:75 watts into a 2 ohm load75 watts into a 4 ohm load75 watts into an 8 ohm loadRated Power Band20Hz to 20,000HzTotal Harmonic DistortionMaximum Total Harmonic Distortion at any power levelfrom 250 milliwatts to rated power output is:0.5% for a 2, 4 or 8 ohm loadFrequency Response+0, -0.5dB from 20Hz to 20,000Hz+0, -3dB from 10Hz to 50,000HzSensitivityPhono: 4.4mV for 2.5V preamp outputHigh Level: 450mV for 2.5V preamp outputPower Amplifier Input: 2.5V for rated outputA-Weighted Signal To Noise RatioPhono Input: 80dB below 10mV inputHigh Level: 97dB below rated outputPower Amplifier: 110dB below rated outputIntermodulation DistortionMaximum Intermodulation Distortion if instantaneouspeak output does not exceed twice the rated output, forany combination of frequencies from 20Hz to 20,000Hz is:0.5% for a 2, 4 or 8 ohm loadInput ImpedancePhono: 47k ohms, 65pFHigh Level: 22k ohmsMaximum Input SignalPhono: 90mVHigh Level: 8VPreamplifier Maximum Voltage OutputPhono: 8VHigh Level: 8VMain Out: 8V at preamp outputVoltage GainHigh Level to Tape output: 0dBHigh Level to Preamp output: 15dBWide Band Damping FactorGreater than 18Power Requirements100 Volts, 50/60Hz at 3.6 amps110 Volts, 50/60Hz at 3.6 amps120 Volts, 50/60Hz at 3.6 amps220 Volts, 50/60Hz at 1.8 amps230 Volts, 50/60Hz at 1.8 amps240 Volts, 50/60Hz at 1.8 ampsNote: Refer to the rear panel of the MA2275 for the correctvoltage.Preamplifier Tube Compliment2 - 12AX7A Phono Circuitry2 - 12AX7A High Level CircuitryPower Amplifier Tube Compliment2 - 12AT74 - KT88/6550Overall DimensionsWidth is 17-3/4 inches (45.09cm), Height is 10-1/8 inches(25.72cm) including feet, Depth is 18-3/4 inches (47.63cm)including the Front Panel and KnobsWeight77 pounds (35 kg) net, 110 pounds (50 kg) in shippingcartonRadioFans.CN 收音机爱 好者资料库3MA2275TOP AND REAR VIEWSPHONOGNDEXT SENSORPOWERAMP INT 4AL 250VSLO-BLO120V50/60Hz 3.6APREAMPTAPEOUTPUTSPOWER CONTROLSUMDATA PORTSMAINACCSERIALNUMBERMA2275McINTOSH LABORATORY, INC.,BINGHAMTON, NY MADE IN USACAUTIONRISK OF ELECTRIC SHOCKDO NOT OPENCAUTIONFOR CONTINUED PROTECTIONAGAINST FIRE HAZARD REPLACE ONLY WITH SAMETYPE ANDRATING FUSE.CD INPUTINTEGRATED AMPLIFIERLRLRDVDTUNERCD 2CDINPUTSTAPE12AVISRISQUE DE CHOC ELECTRIQUE - NE PASOUVRIR. REMPLACER PAR UN FUSIBLE DE MEMETYPE, AMPERAGE ET VOLTAGE.4SECTION LOCATIONSBOTTOM VIEW WITH COVER REMOVED510POWERTRANSFORMERMETERPCBOUTPUTTRANSFORMER3CONTROLPCBOUTPUTTRANSFORMERVOLUME/TONEPCB7PUSHBUTTONPCB8R8LAMPPCBAMPPCB11BACKUP POWERSUPPLY PCB9POWER SUPPLYPCB13TERMINALPCB2MAINPCB12TERMINALPCB6DATAPCBCHOKEFILTER4BALANCEDPCB1111TOP VIEW WITH COVERS REMOVED576MA2275BLOCK DIAGRAM81091INTERCONNECT111312MA22752AMAIN 049965 SH 1 OF 2C20C58C43R96R95R23C15R6R15R5R4R11C2R17C16R35C31R1R10C42R44R3R12R43R45R27C32R42R64C53R73R72JMP1R76R79R70R60R81R84R71R61R82R87R80R94R93R21R19R22R8R20R37R39R40R77R66C19R56C59C46R68C45R69R63C71C69C82R46C41C24C84C85C26C25C28C27C17R30R24D4R91GP1U1U5R92R86J11R25K2K3R26R34C3R2C11C5R9C7R18R74C73R32R28C35C36C33C40C37R41C30U3C34C1C6R14C8C12C86R16C10K21K1U4R29C68C39C38C29R33R38C67R62C56R59C50R83Q4Q2C65R75C54C52C55R53R54R85C74Q1C81C79D2K7R13C76U9K9K8K11C4R7R36U2R90R89K13K12C61R65R67U8R78R57R58C77C60Q3R51R50C72C70K16R55C48C47K19R88C83R52J1C18C23R48C9129472R31C64R49C66C63C51C57V5V6C44R47K20GP2C80J7J6C13K6K10J3K17K18J10C75V4J5U6C62V7C49D1C14J8U11U7C78U10J4J2*Rev. ACDDVDPHCD2TUNERTAPEOUTTAPEOUT 2AMP INOUT 11416152BMAIN 049965 SH 2 OF 21718MA2275CONTROL 04996631920CONTROL 0499663R2R5Q2R12R13C4C5Q1R6R15R17C2C1R1R8C3R22S1DS2DS14DS13DS12JMP1129473U4R11R9R21R23R19R16DS9R10DS1DS4Y1J2J1R20R24R18DS10DS11U1J3R7U5DS7U3DS15DS6R3R4ASSY1DS5U2Rev.ABALANCED 0499674MA227521222324VOLUME/TONE 0499685AVOLUME/TONE 0499685B2526MA2275VOLUME/TONE 0499685R13C19R21R22R20D1R19R24C17C20R25R6R5R2C4K1C16C13R14R15U2C14K4K2R16R23129475C11C1C8C6C3C42C5C9C12R7C15R18R4C10U1R8R3R10R9R11R12K3C18J1R53R26C2C7R17R1U7Rev.ADATA 04996962728C5C1C4D3C2R13R16R14R19R22R8R7R5R2R10R20129476R23R6R3U4D2U3C3R11R21D1J8SP1J5J4J2J7J10J9R9R4R1R12R17R15U1U2R18J6SP2J3J1J11Rev.A2930PUSHBUTTON 0499707MA22750V5.6VNC333333333333J1:18J1:17J1:16J1:13J1:12J1:11J1:8J1:7J1:6J1:3J1:2J1:115V5.6V0V333333J1:15J1:14J1:10J1:5J1:9J1:4TO DISPLTONE BYPASSSTANDBY/ON324R1REC MONMUTEREC MONMUTE.1uFC1MONO47uFC25.6VIR SENSOR5.6V15V5.6V5.6V5.6V5.6VHDPHGNDFP DATA15VREC MONTONEMUTEREC MONTONEBYPASSMUTESTANDBY/ONS4TONE BYPASSMONOS5100R25.6VL HDPHGNDR HDPHTUBEWARMUPMONOMONO12345678DS8R14S1S2S3213VccVoutGNDMT1STANDBY/ONTUBE WARMUP5VJ1:2J1:7J1:12J1:17DS5DS4DS2J1:1J1:3J1:6J1:5J1:8J1:11J1:10J1:13J1:16J1:15J1:18DS3132J2DS1J1:4J1:9J1:14AYNC5.6V5.6V0V0V0V0V4993132AMPLIFIER 0499718RL3334AMPLIFIER 0499718MA2275R30R21L1R10Q7R32C1R17R14Q2R5R11R36R7R6R9R13J3J4J9Q9R16R37R35Q8J1R33C10C8C2C7R8R34Q4Q6J5J6J2C3U1C4C11L2R31R27F1R23R22Q5Q3R15R12R19R25129478C6R20R24C5V1J7V2R28V3Rev.AYELGRYBLUGRNYEL/WHTBLU/WHT3536POWER SUPPLY 0499729111111111111111111L11L111RED14V-15V15V-15V15V2222228L8L8L8L1111RED-24V24V2228L8LJ11:6J11:5J11:3J11:2J11:1T1T1T1T1T1T1T2LT2RGNDGND5VD524V300V100kR5TURN/ON-15V15V-24V300VFIL_BAMP_MUTE-400VFIL_BFIL_A-400VJ5:9J5:714VJ5:6J5:5FIL BJ5:4FILGNDFILAJ5:1GND8RFIL BJ7:68RJ7:5FILGNDFIL B8RJ7:2TURN ON8R-400VJ7:1J7:6J7:5FILGNDJ7:4FILATURN ONJ7:1J11:4T1T15V.047uFC1347uFC62.2k 2wR102341ACACD1-24V4700uFC1447uFC7-400V680uFC4680uFC310uFC1547uFC5D3D2100k 2wR218kR11uFC8100kR6312GDSQ6AMP_MUTE100kR914V24VFIL_ATURN/ONJ5:8J5:3TO MAIN-15V15VJ5:2300V8R8RTO R AMPJ7:4J7:3FIL BJ7:2J7:3-400VTO BACKUP PS4700uFC11680uFC9680uFC1010uFC12D10312Q2221kR8TO L AMPTO POWER TRANSFORMERJ11:1POWER ONPOWERONJ11:5J11:6BLKJ14BLUD9BLU/BLKBLUJ8GRNGRN/BLKJ6FIL_ABLUJ1REDJ12REDJ13-24VPOWER ONPOWERONJ18:6J18:5J17:6J17:1J16:5J11:3J11:2POWER ONF22AJ10D8312INOUTU3F12AJ7D6231INOUTU2FIL_BGRNJ5D4REDJ4J3.047uFC2J21MR7-15V231Q1J18:8J18:9J18:4J18:3J18:2J18:1AMP MUTEJ17:5J17:2J17:3J17:4J16:6AMP MUTEJ16:1J16:2J16:3TURN/ONAMP_MUTE1GP1J9J11:4D7132Q32.74MR4J18:7J16:415V REGULATOR-15V REGULATOR300V REGULATOR100k 2wR75100k 2wR76POWER AMPLIFIERTURN ON CONTROL485V485V485V490V.47uFC1J13C13R9R6R7C8R4J12D10J5J6J7D5D3D2129526D4R8Q6Q3R5Q2J3J4J2J1C5Q1C15D6D8D9F1F2C12GP1J18J17C7R10C6C2R1J9C14C11J11J10J14D7U3U2J8D1C9J16C3R2C4C10BLUBLUBLU/BLKGRNREDREDRev.AGRNREDBLKRED BLUREDGRN/BLKR76R753738MA2275POWER SUPPLY 0499729METER 0499731039404142MA2275BACKUP PS 05000711TERMINAL 05005212TERMINAL 050052134443PARTS LISTRef. No.DescriptionPart No.INTERCONNECTL1CHOKE FILTER .5H122379LFILLINE FILTER117755MT1METER124087MT2METER124087S1POWER SWITCH171026S2SWITCH146243T1POTTED TRANSFORMER, POWER050041T2POTTED TRANSFORMER, OUTPUT050042T3POTTED TRANSFORMER, OUTPUT050042049965 MAIN PCBC1CAP MONO 47PF 200V 10% NPO061299C2CAP MONO 47PF 200V 10% NPO061299C3CAP ELECT 100UF 16V OR 25V066447C4CAP ELECT 100UF 16V OR 25V066447C5CAP MPF 0.1UF 630VDC064431C6CAP MPF 0.1UF 630VDC064431C7CAP PF 0.001UF 5% 63VDC064300C8CAP PF 0.001UF 5% 63VDC064300C9CAP ELECT 100UF 25V-50V066161C10CAP ELECT 100UF 25V-50V066161C11CAP MPF 0.0033UF 5% 63VDC064306C12CAP MPF 0.0033UF 5% 63VDC064306C13CAP MPF 0.1UF 630VDC064431C14CAP MPF 0.1UF 630VDC064431C15CAP ELECT 10UF 50V066445C16CAP ELECT 10UF 50V066445C17CAP ELECT 10UF 16V 4X5 CASE066382C18CAP ELECT 10UF 16V 4X5 CASE066382C19CAP ELECT 10UF 16V 4X5 CASE066382C20CAP ELECT 10UF 16V 4X5 CASE066382C23CAP ELECT 10UF 16V 4X5 CASE066382C24CAP ELECT 10UF 16V 4X5 CASE066382C25CAP ELECT 10UF 16V 4X5 CASE066382C26CAP ELECT 10UF 16V 4X5 CASE066382C27CAP ELECT 10UF 16V 4X5 CASE066382C28CAP ELECT 10UF 16V 4X5 CASE066382C29CAP ELECT 10UF 50V066445C30CAP ELECT 10UF 50V066445C31CAP MONO 100PF 100V 10% NPO061300C32CAP MONO 100PF 100V 10% NPO061300C33CAP MONO 100PF 100V 10% NPO061300C34CAP MONO 100PF 100V 10% NPO061300C35CAP MONO 100PF 100V 10% NPO061300C36CAP MONO 100PF 100V 10% NPO061300C37CAP MONO .1uF 50V 20% Z5U061305C38CAP ELECT 10UF 16V 4X5 CASE066382C39CAP ELECT 10UF 16V 4X5 CASE066382C40CAP MONO .1uF 50V 20% Z5U061305C41CAP MONO .1uF 50V 20% Z5U061305C42CAP MONO .1uF 50V 20% Z5U061305C43CAP ELECT 10UF 50V066445C44CAP MONO 220PF 100V 10% NPO061301C45CAP ELECT 10UF 16V 4X5 CASE066382C46CAP ELECT 10UF 16V 4X5 CASE066382C47CAP ELECT 10UF 50V066445C48CAP ELECT 10UF 50V066445C49CAP ELECT 100UF 25V-50V066161C50CAP ELECT 100UF 25V-50V066161C51CAP MPF 0.22UF 400VDC064438C52CAP MPF 0.22UF 400VDC064438C53CAP MONO 220PF 100V 10% NPO061301C54CAP MONO 220PF 100V 10% NPO061301C55CAP MONO 47PF 200V 10% NPO061299C56CAP MONO 47PF 200V 10% NPO061299C57CAP ELECT 22UF 100V066506C58CAP MONO 220PF 100V 10% NPO061301C59CAP MONO .1uF 50V 20% Z5U061305C60CAP ELECT 10UF 50V066445C61CAP POLY .047UF 10% 1000VDC064434C62CAP POLY .047UF 10% 1000VDC064434C63CAP MONO .1uF 50V 20% Z5U061305C64CAP MONO .1uF 50V 20% Z5U061305C65CAP ELECT 10UF 50V066445C66CAP ELECT 10UF 50V066445C67CAP MONO .1uF 50V 20% Z5U061305C68CAP MONO .1uF 50V 20% Z5U061305C69CAP ELECT 10uF 50V066445C70CAP ELECT 10uF 50V066445C71CAP ELECT 10uF 50V066445C72CAP ELECT 10uF 50V066445C73CAP ELECT 10UF 50V066445C74CAP MONO .1uF 50V 20% Z5U061305C75CAP ELECT 10UF 250V066493C76CAP ELECT 1000UF 25V066513C77CAP ELECT 10UF 50V066445C78CAP MONO 47PF 200V 10% NPO061299C79CAP MONO 47PF 200V 10% NPO061299C80CAP MONO 100PF 100V 10% NPO061300C81CAP MONO 100PF 100V 10% NPO061300C82CAP MONO .1uF 50V 20% Z5U061305C83CAP MONO .1uF 50V 20% Z5U061305C84CAP MONO .1uF 50V 20% Z5U061305C85CAP MONO .1uF 50V 20% Z5U061305C86CAP ELECT 10UF 250V066493D1DIODE SILICON070047D2DIODE SILICON070047D4DIODE SILICON070047GP1BRACKET PCB CARD MOUNTING003611GP2BRACKET PCB CARD MOUNTING003611J1CONN 12 PIN FFC117720J2JACK RCA 4X2 WHT/RED 14MM117791J3JACK RCA 4X2 WHT/RED 14MM117791J4JACK RCA 2X2 WHT/RED 14MM117789J5HEADER 9 CIRCUIT POST NATURAL117724J6CONN FFC 18PIN117765J7CONN 12 PIN FFC117720J8CONN 23 PIN FFC117715J10CONN 12 PIN FFC117720J11CONN 12 PIN FFC117720K1RELAY REED FORM 1A 5V 500 OHMS087050K2RELAY REED FORM 1A 5V 500 OHMS087050K3RELAY REED FORM 1A 5V 500 OHMS087050K6RELAY REED FORM 1A 5V 500 OHMS087050K7RELAY REED FORM 1A 5V 500 OHMS087050K8RELAY REED FORM 1A 5V 500 OHMS087050K9RELAY REED FORM 1A 5V 500 OHMS087050K10RELAY REED FORM 1A 5V 500 OHMS087050K11RELAY REED FORM 1A 5V 500 OHMS087050K12RELAY REED FORM 1A 5V 500 OHMS087050K13RELAY REED FORM 1A 5V 500 OHMS087050K16RELAY REED FORM 1C 5V 125 OHM087056K17RELAY REED FORM 1C 5V 125 OHM087056K18RELAY REED FORM 1A 5V 500 OHMS087050K19RELAY REED FORM 1A 5V 500 OHMS087050K20RELAY REED FORM 1A 5V 500 OHMS087050K21RELAY REED FORM 1A 5V 500 OHMS087050Q1TRANSISTOR NPN132223Q2TRANSISTOR NPN132257Q3TRANSISTOR NPN132257Q4TRANSISTOR PNP132224R1RES MF 1K 1% 1/4W144090R2RES MF 1K 1% 1/4W144090R3RES MF 47.5K 1% 1/4W144108R4RES MF 47.5K 1% 1/4W144108R5RES MF 953 OHM 1/4W 1%144473R6RES MF 1.74K 1% 1/4W144351R7RES MF 953 OHM 1/4W 1%144473R8RES MF 1.74K 1% 1/4W144351R9RES MF 221K 1% 1/4W144421R10RES MF 221K 1% 1/4W144421R11RES MF 75K 1% 1/4W144156R12RES MF 75K 1% 1/4W144156R13RES MF 1M 1/4W144269R14RES MF 1M 1/4W144269R15RES MF 681 OHM 1% 1/4W144195R16RES MF 681 OHM 1% 1/4W144195R17RES MF 150K 1% 1/4W144419R18RES MF 150K 1% 1/4W144419R19RES MF 1M 1/4W144269R20RES MF 1M 1/4W144269R21RES MF 221K 1% 1/4W144421R22RES MF 221K 1% 1/4W144421R23RES MF 2.21K 1% 1/4W144298R24RES MF 100 OHM 1% 1/4W144196R25RES MF 22.1K 1% 1/4W144187R26RES MF 22.1K 1% 1/4W144187R27RES MF 200K 1% 1/4W144117R28RES NETWORK 2X220K ISO144262R29RES NETWORK 2X220K ISO144262R30RES MF 100 OHM 1% 1/4W144196R31RES NETWORK 2X220K ISO144262R32RES NETWORK 2X220K ISO144262R33RES MF 221K 1% 1/4W144421R34RES MF 221K 1% 1/4W144421R35RES MF 1K 1% 1/4W144090R36RES MF 47.5K 1% 1/4W144108R37RES MF 47.5K 1% 1/4W144108R38RES MF 1K 1% 1/4W144090R39RES MF 47.5K 1% 1/4W144108R40RES MF 47.5K 1% 1/4W144108R41RES MF 24.9K 1% 1/4W144439R42RES MF 24.9K 1% 1/4W144439R43RES MF 200K 1% 1/4W144117R44RES MF 22.1K 1% 1/4W144187R45RES MF 22.1K 1% 1/4W144187R46RES MF 100K 1% 1/4W144113R47RES MF 1K 1% 1/4W144090R48RES MF 1K 1% 1/4W144090R49RES NETWORK 2X220K ISO144262R50RES MF 221 OHM 1% 1/4W144172R51RES MF 221 OHM 1% 1/4W144172R52RES MF 100K 1% 1/4W144113R53RES MF 2.74K 1% 1/4W144304R54RES MF 2.74K 1% 1/4W144304R55RES MF 2.74K 1% 1/4W144304R56RES MF 2.74K 1% 1/4W144304R57RES MF 221K 1% 1/4W144421R58RES MF 221K 1% 1/4W144421R59RES MF 2.21M 1/4W144265R60RES MF 2.21M 1/4W144265R61RES MF 13.7K 1% 1/4W144342R62RES MF 13.7K 1% 1/4W144342R63RES MF 1.5K 1% 1/4W144128R64RES MF 1.5K 1% 1/4W144128R65RES MF 200K 1% 1/4W144117R66RES MF 200K 1% 1/4W144117R67RES MF 10K 1% 1/4W144053R68RES MF 10K 1% 1/4W144053R69RES MF 100K 1% 1/4W144113R70RES MF 100K 1% 1/4W144113R71RES MF 33.2K 1% 1/4W144015R72RES MF 2.74K 1% 1/4W144304R73RES MF 2.74K 1% 1/4W144304R74RES MF 100K 1% 1/4W144113R75RES MF 221K 1% 1/4W144421R76RES MF 10K 1% 1/4W144053R77RES MF 100 OHM 1% 1/4W144196R78RES MF 100 OHM 1% 1/4W144196R79RES MF 33.2K 1% 1/4W144015R80RES MF 33.2K 1% 1/4W144015R81RES MF 221 OHM 1% 1/4W144172R82RES MF 33.2K 1% 1/4W144015R83RES MF 221 OHM 1% 1/4W144172R84RES MF 33.2K 1% 1/4W144015R85RES MF 221 OHM 1% 1/4W144172R86RES MF 1K 1% 1/4W144090R87RES MF 221 OHM 1% 1/4W144172R88RES MF 10K 1% 1/4W144053R89RES MF 40.2K 1% 1/4W144107R90RES MF 40.2K 1% 1/4W144107R91RES MF 4.75 MEG 1% 1/2W144366R92RES MF 1K 1% 1/4W144090R93RES MF 1K 1% 1/4W144090R94RES MF 1K 1% 1/4W144090R95RES MF 2.21K 1% 1/4W144298R96RES MF 2.21K 1% 1/4W144298U1IC OCTAL DARLNGTON TRANS ARRAY133258U2IC OCTAL DARLNGTON TRANS ARRAY133258U3IC DUAL OPERATIONAL AMPLIFIER133260U4IC SHFT REG SER-PAR133186U5IC SHFT REG SER-PAR133186U6IC DUAL OPERATIONAL AMPLIFIER133260U7IC AND 2 INPUT X 4133175U8IC DUAL OPERATIONAL AMPLIFIER133260U9IC DUAL OPERATIONAL AMPLIFIER133260U10IC REGULATOR +5V133108U11IC DUAL OPERATIONAL AMPLIFIER13