McIntosh-MA6900-int-sm 维修电路原理图.pdf

SERVICE MANUALPerformance Specifications . 2Notes . 2Rear Panel . 3Section Location . 4Block Diagram . 5 - 6Interconnection Diagram . 7 - 8Main Schematic and PCB. 9 - 18Balanced Schematic and PCB. 12, 18Heatsink Schematic and PCB . 19 - 20Capacitor Schematic and PCB . 21 - 22Control Schematic and PCB . 23 - 26Lamp Schematic and PCB . 25 - 26Tone Schematic and PCB . 27 - 31Keyboard Schematic and PCB . 30 - 32Parts List . 33 - 36Exploded Views and Parts Lists . 37 - 40Repacking Instruction . 41CONTENTSINTEGRATED 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. A high 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, all channels operating is:200 watts into 2 ohm load200 watts into 4 ohm load200 watts into 8 ohm loadRated Power Band20Hz to 20,000HzTotal Harmonic DistortionMaximum Total Harmonic Distortion at any power levelfrom 250 milliwatts to rated power output is:0.005% for 2, 4 or 8 ohm loadsDynamic Headroom2.4dBFrequency Response+0, -0.5dB from 20Hz to 20,000Hz+0, -3dB from 10Hz to 100,000HzSensitivityPhono, 2.5mV for 2.5V rated output (0.5mV IHF)High Level, 250mV for 2.5V rated output (50mV IHF)Power Amplifier Input, 2.5V for rated outputSignal To Noise Ratio (A Weighted)90dB (84dB IHF) below 10mV input, Phono Input100dB (90dB IHF) below rated output, High Level110dB below rated output, Power AmplifierIntermodulation DistortionMaximum Intermodulation Distortion if instantaneous peakoutput per channel does not exceed twice the rated output,for any combination of frequencies from 20Hz to 20,000Hz,with all channels operating is:0.005% for 2, 4 or 8 ohm loadsInput ImpedancePhono, 47k ohms, 65pFHigh Level, 22k ohmsMaximum Input SignalPhono, 90mVHigh Level, 8VPreamplifier Maximum Voltage OutputPhono, 8V at tape outputHigh Level, 8V at tape outputMain Out, 8V at preamp outputVoltage GainHigh Level to Tape: 0dBHigh Level to Main: 20dBWide Band Damping FactorGreater than 40Power Requirements100 Volts, 50/60Hz at 4.8 amps110 Volts, 50/60Hz at 4.4 amps120 Volts, 50/60Hz at 4.2 amps220 Volts, 50/60Hz at 2.0 amps230 Volts, 50/60Hz at 2.0 amps240 Volts, 50/60Hz at 2.0 ampsNote: Refer to the rear panel of the MA6900 for the correct voltage.Overall DimensionsFront Panel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches(18.10cm) high. Depth behind front mounting panel is 16-1/2inches (41.91cm). Clearance required in front of the Front Panelis 1 inch (2.54cm) for knobs.Weight74.5 pounds (33.8 Kg) net, 92.5 pounds (41.7 Kg) in shippingcartonRadioFans.CN 收音机爱 好者资料库3MA6900REAR PANEL4SECTION LOCATIONSBOTTOM VIEW WITH COVER REMOVEDTOP VIEW WITH COVER REMOVEDBLOCK DIAGRAM56MA690078INTERCONNECT1TB191110MAIN 049688 1 OF 3MA69002121413MAIN 049688 2 OF 32BALANCED315MAIN 049654 3 OF 32MA690016183BALANCED 049654BMAIN 049654217MA69001920HEATSINK 0496654A 4B2122CAPACITOR 04965352324CONTROL 0496556MA69002526CONTROL PCB 0496556LAMP 0492357A 7BTONE 049656MA69008272928TONE 049656KEYBOARD 049696893032313334PARTS LISTMA6900Part No.DescriptionReference No.InterconnectF1FUSE08910400MT1 MT2METER12707700RT1 RT2THERMISTOR05200800S1SWITCH14807300T1POWER TRANSFORMER04967600T2 T3OUTPUT TRANSFORMER04967500TB1TERMINAL BLOCK07409100049654 MAIN PCBC1 C2 C69 C70 C71 C72 C73 C74 C75 C76CAP ELECT 10UF 16V06638200C3 C4 C9 C10 C11 C12 C47 C48 C49CAP MONO 100PF 100V 10%06130000C5 C6 C93 C94CAP ELECT 47UF 35V06644600C7 C8CAP DISC .47UF 50V MONO06124900C13 C14CAP POLY .15UF 10% 250V06436300C15 C16CAP POLY .047UF 10% 250V06436400C17 C18CAP MPOLY .0068UF 5% 63VDC06431000C19 C20 C21 C22 C23 C24 C27 C28 C31CAP ELECT 10UF 100VDC06646200C25 C26 C29 C30 C38 C41 C42 C55 C56CAP MONO .1UF 50V 20% Z5U06130500C33 C34 C39 C40 C43 C44 C45 C46 C53CAP ELECT 10UF 50V06644500C35 C36CAP ELECT 1UF 50V06651000C50 C51 C52 C59 C60 C91 C92CAP MONO 100PF 100V 10%06130000C54 C77 C78 C87 C88CAP ELECT 10UF 50V06644500C57 C58 C89 C90CAP MONO 47PF 200V 10%06129900C61 C62CAP M POLY .033UF 5% 63VDC06431800C63 C64CAP M POLY .01UF 5% 63VDC06431200C65 C66 C118 C119CAP ELECT 220UF 25V06650700C67 C68 C95 C96 C97 C98 C99 C103CAP MONO .1UF 50V 20%06130500C79 C80 C81 C82 C83 C84 C85 C86CAP ELECT 10UF 16V06638200C100 C101 C102CAP MONO 220PF 100V 10%06130100C104 C105 C107 C110 C114CAP MONO .1UF 50V 20% Z5U06130500C106CAP ELECT 470UF 50V06646900C108 C113CAP ELECT 1000UF 25V06651300C109 C112 C116CAP ELECT 3300UF 35V06650900C111 C115CAP ELECT 100UF 25V06644700C117CAP M POLY .1UF 10% 100VDC06425400D1 D2 D3 D4 D5 D6 D7 D8 D11 D12DIODE SILICON07004700D9 D10DIODE ZENER 16V 5% 500MW07011400D13 D14 D15 D16 D17 D18 D19 D20DIODE RECTIFIER07013100D21 D23 D24DIODE SILICON07004700D22DIODE ZENER 8.2V 1/2W07013000F1FUSE 2A SLO-BLO 5X2008908900F1 F2 F3HLDR FUSE 5X20MM PCB MNT17815900F2 F3FUSE 5X20 1.6A IEC SLO-BLO08909600IC1IC NAND 2 INPUT X 413316100IC2 IC3 IC16IC OPERATIONAL AMPLIFIER13302800IC4 IC5IC OPRTINL AMP LOW NOISE13306700IC6 IC7 IC17IC DUAL OPERATIONAL AMP13326000IC8 IC10 IC12IC SHFT REG SER-PAR13318600IC9IC OCTAL DAR TRNS ARRY13336000IC11 IC13IC 8 LN DRIVER ARRAY13318000IC14 IC15IC AND 2 INPUT X 413317500J1 J2CONN MALE 7 PIN11721700J3 J4 J6CONN 4 PIN11721500J5CONN 23PIN FFC11771500J7CONN MALE 3 POS MTS100 NRML11721400J8CONN 8 POS MALE FRCTION LK11727500J9 J10 J11 J12 J13BLADE FASTON W/FEET11770800J14 J15RECEPTACLE XLR FEMALE11768500J16 J17 J18RCA JACK 3X2 WHT/RED 14MM11779000J19 J20 J21 J22 J23 J24JACK HDPHNE DUAL BLACK 1/811754900J25CONN GOLD F RIGHT ANGLE11766100J26 J27CONN MALE 5 PIN 0.1 POST11721600K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11RLY REED FORM 1A 5V 500OHMS08705000K12 K13 K14 K15 K16 K17 K18RLY REED FORM 1A 5V 500OHMS08705000K19RELAY POWER TV5 24V08706900LDR1 LDR2LDR NETWORK VTL5C914417900Q1 Q2 Q3 Q4TRANSISTOR N JFET13222200Q5 Q6 Q7 Q8 Q19 Q20TRANSISTOR NPN13225400Q9 Q10 Q11 Q12 Q13 Q14TRANSISTOR PNP 120V13225500Q15 Q16 Q27 Q28 Q29 Q30 Q37 Q38 Q48TRANSISTOR PNP13222400Q17 Q18 Q21 Q22 Q23 Q24 Q25 Q31 Q33TRANSISTOR NPN 2K/REEL13222300Q34 Q41 Q42 Q43 Q44 Q46 Q52 Q53TRANSISTOR NPN 2K/REEL13222300Q35 Q36TRANSISTOR PNP 2SA32IC13228600Q39 Q40TRANSISTOR NPN 25C3334C13228500Q45 Q47TRANS POWER N-CHN ENHANCE13224200Q49IC REGULATOR +5V13310800Q50IC REGULATOR -15V13315300Q51IC REGULATOR 15V13315400Q54TRANS P CHAN JUNCTION FET13222600R1 R2 R23 R24 R26 R61 R62 R91 R92RES MF 10K 1% 1/4W14405300R3 R4 R49 R50 R53 R54 R84 R171RES MF 3.32K 1% 1/4W14409500R5 R6 R15 R16RES MF 475 1% 1/4W14408600R7 R8 R93 R94RES MF 10M 1% 1/4W14426400R9 R10 R11 R12 R113 R114 R170RES MF 47.5K 1% 1/4W14410800R19 R20 R137 R141 R146 R147 R151RES MF 1K 1% 1/4W14409000R21 R22 R77 R78 R79 R80 R155RES MF 100 1% 1/4W14419600R25RES MF 165K 1% 1/4W14411600R27RES MF 68.1K 1% 1/4W14408100R29 R30 R63 64 R101 R102RES MF 4.75K 1% 1/4W14409700R35 R36 R37 R38RES MF 806 1% 1/4W14408900R39 R40 R59 R60RES MF 187K 1% 1/4W14440600R41 R42 R43 R44 R45 R46 R47 R48 R132RES MF 221 1% 1/4W14417200R51 R52 R55 R56 R57 R58 R65 R66RES MF 324 OHM 1% 1/4W14433800R67 R68RES 1.8 OHM 2W 5% WW FP13923000R69 R70RES WW 2.7 OHM 2W 5% FP13921800R71 R72RES MF 27.4K 1% 1/4W14414100R73 R74 R75 R76RES FP 47 OHM 5% 1/4W13704200R81 R83 R166 R167RES MF 12.1K 1% 1/4W14415400R82 R87RES MF 2.1K 1% 1/4W14429900R85RES MF 20K 1% 1/4W14410400R86 R89 R90 R111 R129 R145RES MF 100K 1% 1/4W14411300R95 R96RES MF 274K 1% 1/4W14444100R97 R98POT TRIM 100K OHM13450200R99 R100RES MF 2.21M 1/4W14426500R103 R104 R105 R106RES MF 11K 1% 1/4W14410100R107 R108 R109 R110RES MF 5.62K OHM 1% 1/4W14444700R112 R125 R126 R127 R128 R130 R131RES NETWORK 2X220K ISO14426200R115 R116RES MF 47.5 1% 1/4W14444200R117 R118RES MF 95.3K 1% 1/4W14412700R119 R120 R172RES MF 7.5K 1% 1/4W14421000R121 R122RES MF 95.3 1% 1/4W14422000R123 R124RES MF 2.21 OHM 1/4W 1%14437800R13 R14 R17 R18 R31 R32 R33 R34RES MF 267K 1% 1/4W14411800R133 R134 R135 R138 R139RES MF 221 1% 1/4W14417200R136 R140RES NET 2 X 22K ISOLATED14436600R142 R143RES MF 30.1K 1% 1/4W14422500R144 R148RES NETWORK 2X220K ISO14426200R149 R150RES MF 22.1 1% 1/4W14416000R152 R153RES MF 1K 1% 1/4W14409000R154RES NETWORK 8X100 ISO14427500R156 R157 R158 R159 R160 R161 R162RES MF 182 1/4W 1%14427300R163RES MF 182 1/4W 1%14427300R164 R165RES MF 178K 1% 1/4W14442000R168RES MF 3.65K 1% 1/4W14418900R169RES MF 3.16K 1% 1/4W14419900R173RES MF 5.11K 1% 1/4W14408300S1SWITCH SLIDE14805900SP1 SP2BRACKET PCB CARD MOUNTING003611003536PARTS LIST contPart No.DescriptionReference No.049665 HEATSINK PCBC1 C2CAP ELECT 47UF 35V06644600C3 C5CAP MONO .1UF 50V 20% Z5U06130500C7 C8CAP MONO 100PF 100V 10% NPO06130000C9 C16CAP MONO .01UF 50V 20% X7R06130400C10CAP POLYPROP 0.15UF 10% 250VDC06436300D1 D2 D3 D4 D5DIODE SILICON07004700D6 D7DIODE 200V 6A07013300J1-CONN MALE 7 PIN11721700J2-CONN HEADER 2 PIN 0.15611740400J4BLADE FASTON W/FEET11770800J4-CONN MALE 2 PIN11721300Q1TRANSISTOR NPN SILICON13217100Q2TRANSISTOR PNP SILICON13217200Q6TRANSISTOR NPN13226200Q7TRANSISTOR PNP13226100R1 R8RES MF 221 1% 1/4W14417200R2 R9RES MET OX 680 5% .5W13709300R3 R10RES MF 15K 1% 1/4W14441200R6 R11RES MET OX 1.8K 5% .5W13709400R7RES MET OX 430 5% .5W13709500R12RES MET OX 47 5% .5W13709600R13POT TRIM 200 OHM 20% HORIZ AD13439000R30RES MF 2.21 OHM 1/4W 1%14437800R31 R32 R33 R36 R37 R38RES WW .5 OHM 5W 5%13917700RT1SENSOR THERMAL14424900049653 CAPACITOR PCBC1 C2CAP ELECT 25000UF 75V06650400C3CAP M POLY .22UF 20% 400VDC06426700D1 D2DIODE SILICON07004700D3DIODE BRIDGE RECTIFIER07013900J1CONN MALE 3 POS MTS100 NORMAL11721400J2 J3CONN HEADER 2 PIN 0.15611740400J4 J5 J6 J7 J8 J9BLADE FASTON W/FEET11770800K1 K2RELAY 24V TV8/VDE CERTIFIED08707200049655 CONTROL PCBC3 C5 C6 C7 C10CAP MONO .1UF 50V 20% Z5U06130500C4CAP ELECT 220UF 25V06650700C8 C9CAP MONO 220PF 100V 10% NPO06130100DS1 DS2 DS3 DS4 DS5 DS6 DS7 DS8 DS9LED LAMP RED07009300DS10 DS11 DS12LED LAMP RED07009300DS13 DS14LED AMBER05813300DS15 DS16 DS17 DS18 DS19 DS20LAMP INCANDESCENT 14V 100MA05815300DS21 DS23LAMP INCANDESCENT 14V 100MA05815300IC1IC AND 2 INPUT X 413317500IC2IC DC MOTOR DRIVER13319100IC3 IC4IC SHFT REG SER-PAR13318600IC5IC PROGRAMMED13343800IC5SOCKET IC 24-PIN17813900IC6IC MICRO RESET POS13324100J1CONN 23PIN FFC11771500J6CONN 12 PIN FFC11772000J7 J8CONN 4 PIN11721500R2RES MF 100K 1% 1/4W14411300R3RES MF 75 OHM 1% 1/4W14444400R4RES MF 10 1% 1/4W14415700R5 R16RES MF 10K 1% 1/4W14405300R6RES NETWORK 3X10K BUSSED14429000R7 R8 R9 R10 R11 R12 R13 R20 R21RES MF 324 OHM 1% 1/4W14433800R14 R15RES MF 1K 1% 1/4W14409000R19RES MF 2.21 OHM 1/4W 1%14437800Y1RESONATOR CERAMIC 6.0MHZ W/CAP18003900049235 LAMP PCBDS1 DS2 DS3LAMP 14V #737305812000J14 PIN RT. ANGLE11724000J2CONN. 2 POS. R-ANGLE11727400049656 TONE PCBC1 C2CAP M POLY .1UF 10% 100VDC06425400C3 C4CAP ELECT 10UF 16V (4X5 CASE)06638200C5 C6CAP MONO 220PF 100V 10% NPO06130100C7 C8CAP MONO 47PF 200V 10% NPO06129900C9 C10CAP MONO 22PF 200V 10% NPO06129800C11 C12CAP ELECT 220UF 25V06650700C13 C14 C33 C34CAP ELECT 47UF 50V06621500C15 C16 C43 C44 C45 C46 C54CAP ELECT 10UF 50V06644500C17 C18CAP M POLY .047UF 5% 63VDC06432000C19 C20CAP ELECT 1.5UF 10% 50V06627100C21 C22CAP M POLY .01UF 5% 63VDC06431200C23 C24CAP M POLY .47UF 5% 50/63VDC06433300C25 C26CAP MPOLY .0033UF 5% 63VDC06430600C27 C28CAP M POLY .15UF 5% 63VDC06432700C29 C30CAP POLY 0.001MF 5% 63VDC06430000C31 C32CAP M POLY .033UF 5% 63VDC06431800C35 C36 C37 C38CAP M POLY .22UF 5% 63VDC06432900C39 C40 C41 C42CAP MONO 470PF 100V 10% NPO06130200C47 C48 C49 C50 C51 C52CAP MONO .1UF 50V 20% Z5U06130500C53CAP ELECT 47UF 10V BP06637800D1 D2DIODE SILICON07004700IC1 IC6 IC7IC DUAL OPERATIONAL AMPLIFIER13326000IC2 IC3 IC4 IC5IC OPERATIONAL AMPLIFIER13302800J1CONN 8 POS MALE FRICTION LOCK11727500J2CONN 4 PIN11721500J3CONN MALE 6 POS RT ANGLE11770700K1 K2 K3RELAY REED FORM 1A 5V 500 OHMS08705000R1POT 50KAX213449000R2POT BALANCE 2KOHM13446400R3 R4 R5 R6 R7POT EQUAL13445700R9 R10RES MF 2.21K 1% 1/4W14429800R11 R12RES MF 3.32K 1% 1/4W14409500R13 R14RES MF 475K 1% 1/4W14436400R15 R16 R19 R20RES MF 1K 1% 1/4W14409000R17 R18RES MF 10K 1% 1/4W14405300R21 R22 R45 R46RES MF 2.74K 1% 1/4W14430400R23 R24 R27 R28 R31 R32 R35 R36RES MF 681 1% 1/4W14419500R25 R26R29 R30 R33 R34 R37 R38 R43RES MF 100K 1% 1/4W14411300R39 R40RES MF 475 1% 1/4W14408600R41 R42RES MF 40.2K 1% 1/4W14410700R44 R51 R52RES MF 100K 1% 1/4W14411300R47 R48RES MF 33.2K 1% 1/4W14401500R49 R50RES MF 22.1 1% 1/4W14416000R53 R54RES MF 100 1% 1/4W14419600R55 R56 R57 R58RES MF 10 1% 1/4W14415700049696 KEYBOARD PCBC1CAP MONO .1UF 50V 20% Z5U06130500C2CAP ELECT 47UF 35V06644600J3JACK PHONO 1/8 STEREO VER11746200J4CONN 4 PIN11721500J5CONN 12 PIN FFC11772000MT1GASKET SENSOR09437700MT1RECEIVER IR12104100R1RES MF 100 1% 1/4W14419600S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12SWITCH TACT1500580038EXPLODED VIEW37MA69003940EXPLODED VIEWEXPLODED PARTS LISTDescriptionPartNo.ItemNo.1016456GLASS2148073INPUT POWER SWITCH3017531PUSHBUTTON ASSY RED4017517PUSHBUTTON ASSY BLK5078033O-RING6749695KNOB ASSY7104017WASHER FELT BLK 3/4 X 1/4 X 1/168749694KNOB ASSY9104073WASHER FELT 1/4 X 5/8 MPI-410017854BEZEL HEADPHONE11018707BOTTOM EXTRUSION12400149SCREW MACH 6-32 X 1/4 FL U/H ST13018738TOP EXTRUSION14094016TAPE FOAM 1/4 X 1/815004899BRACKET EXTRUSION16018612ENDCAP 7”17401042SCREW TS 4-40 X 1/2 SLOT FILLISTER18094360TAPE FOAM 1/2 X 1/219401172SCREW TC 6-32 X 1/4 PH FL U/C20017363PLEXIGLAS FILTER LT BLUE21094017TAPE FOAM 1/4 X 1/422017864PLEXI MA690023022314FISHPAPER SHIELD24749696KEYBOARD PCB ASSY25005475SUBPANEL26410004NUT CONTROL M7 X 0.75 HEX27404013WASHER LOCK 5/16 X .435 X .00228410002NUT 5 CONTROL M9 X 0.7529404014WASHER LOCK 3/8 X .507 X .002 INT STAR30077032SLEEVING FIBERGLASS 7/1631401054SCREW TAPTITE 6-32 X 1/4 PH PAN BLK32750510CONTROL PCB ASSY33021165SPACER 4 X 1/434402001KEP NUT 4-40 CADMIUM PLATE35749656TONE PCB ASSY36124092METER37092342FILTER PALE BLUE38017447LIGHT BOX PLASTIC39749235LAMP PCB ASSY40114072RIVET NYLON POP-IN41005714DUST COVER42126819TOP COVER DECAL43400287SCREW MACH 8-32 X 3/8 PH TRUSS HD44400250SCREW MACH SEMS 6-32 X 1/4 PH PAN45005702CHASSIS46749675OUTPUT TRANSFORMER47749676POWER TRANSFORMER48166128DECAL OUTPUT TRANSFORMER49166129DECAL POWER TRANSFORMER50018691HEATSINK51084194ISOSTRATE52112087SPACER PCB 1/453749665HEATSINK PCB ASSY54414118CLIP TRANSISTOR 21855414119CLIP TRANSISTOR 21456401059SCREW SM 6 X 5/8 PH PAN TYPE A57005188SUBREAR PANEL58749653CAPACITOR PCB ASSY59412060SPACER #4 X 5/16 STEEL60401078SCREW TAP 8-32 X 5/16 PH PAN61402003NUT MACH 6-32 W/LOCK62005202STRAP63005185TOP COVER64084135THERMAL PAD65094401T