McIntosh-C22-pre-sm2 维修电路原理图.pdf

Mclntosh Laboratory, Inc. 2 Chambers Street, Binghamton, New York 13903 PrintedCONTENTSPerformance Specifications 3Notes 3Rear Panel 4Front Panel and Trim Parts List 4Section Locations 5-6Block Diagram 5-6Interconnection Diagram 6-9Input/Output (Left and Right) 10-12Amplifier 11-14Control and Balance Control 14-18Treble 19Bass 20Speaker Switch 21AC Power Supply 22DC Power Supply 23Repacking Instructions 24RadioFans.CN 收音机爱 好者资料库Performance SpecificationsFREQUENCY RESPONSE+ 0, -0.5dB from 20Hz to 20,000HzRATED OUTPUT2.5V at MAIN and SWITCHED 1 and 2, andBALANCED OUTPUTSMAXIMUM VOLTAGE OUTPUTMore than 8V at all outputsTOTAL HARMONIC DISTORTION0.002% maximum IHF, 0.2% maximum from 20Hzto 20,000Hz at rated outputSENSITIVITYPhono: 2.2mV for 2.5V rated output, (0.45mV IHF)High Level: 250mV for 2.5V rated output, (50mVIHF)SIGNAL-TO-NOISE RATIO, A-WEIGHTEDPhono: 80dB below 10mV inputHigh Level: 90dB below rated outputVOLTAGE GAINPhono To Tape: 41 dB at 1000HzPhono To Main: 61 dB at 1000HzHigh Level To Tape: 0dBHigh Level To Main: 20dBINPUT IMPEDANCEPhono: 47K ohms and 65pF CapacitanceHigh Level: 22K ohmsTONE CONTROLSBass and Treble stepped, 20dB boost to 20dB cutAC POWER OUTLETS4 switched and 1 unswitched, Total capacity 1400wattsPOWER REQUIREMENTS120V, 50/60Hz, 37 wattsDIMENSIONSFront Panel: 16 inches (40.6cm) wide by 5-7/16inches (13.8cm) high. Chassis depth behind mount-ing panel, including clearance for connectors: 14inches (35.6cm). Knob clearance required in front ofmounting panel: 1-1/2 inches (3.8cm).FINISHAnodized gold and black front panel, chassis is black.WEIGHT16 pounds (7.3Kg) net, 25 pounds (11.4Kg) inshipping cartonNotes1. The four types of heavy lines on the schematicsdenote the primary signal path in the followingmanner:= LEFT CHANNEL= RIGHT CHANNEL= LEFT BALANCED= RIGHT BALANCED2. Unless otherwise noted, all voltages indicated onthe schematics are measured under the followingconditions:a. AC input at 120 volts, 50/60Hz.b. All voltages are 10% with respect toground. A high impedance (10 megohm)voltmeter must be used.3. Unless otherwise specified:a. Resistor values are in ohms.b. Capacitor values are in microfarads (uF).4. The voltages enclosed in a box are signal voltagesthat are measured with a 2.2mV, 1kHz signalconnected to both channels at the PHONO 1INPUT JACKS.FRONT PANEL CONTROLS are set at:BALANCE CENTER DETENTBASS and TREBLE CENTER DETENTINPUT SELECTOR PHONO 1LOUDNESS NORMALMODE STEREOPOWER ONVOLUME CLOCKWISETAPE MONITOR 1 and 2 NORMALRUMBLE and HF FILTERS FLATSPEAKERS 1&25. On PC Board Drawings, Square Pad Indicates:a. Polarized Capacitors - Positiveb. Diode - Cathodec. Others - Pin 16. WARNING:Parts marked with the symbol have criticalcharacteristics. Use ONLY replacement partsrecommended by the manufacturer.3RadioFans.CN 收音机爱 好者资料库Rear PanelFig. 1 Rear viewFRONT PANEL and TRIMPARTS LISTSymbol016340016334018511018512018520018521C22-FrontPanel090242090243090244101035104143104144DescriptionIndicator GlassFront Panel GlassTop Panel ExtrusionLower Panel ExtrusionEnd Cap LeftEnd Cap RightFront Panel Complete W/GlassInput/Mode KnobBalance/Volume KnobBass/Speaker/Treble KnobScrew, 4-40 x 5/16 Fill HeadFelt Washer 3/4 DiaFelt Washer 5/8 Dia456Block DiagramSection LocationsINTERCONNECTIONPARTS LISTSymbol Part DescriptionCAPACITORSC1.C2 061276 DISC CAP, .0047uF,400VACJACKSJ2,J3 117563 Phone JackJ4,J5 117437 XLR Connector, MaleLIGHTING DEVICESDS1.DS2 058138 Lamp Fuse StyleDS3.DS4 058137 Lamp Disc IndicatorSWITCHESS1-S6 148068 Slide Switch (SPDT)TRANSFORMERST1 159248 Power TransformerInterconnect on Diagram789Input/Output Left and RightAMPL F ER PCB 04 47412011EFT NPUT /OU PUTS PCB 04 481ANDRIG T NPU S/OU PUTS PCB 0 84 6AMP I I RPAR S I TS mb l a tRE A SK1 K4 87 56D OD SD1 D2 70 02TR NS S ORSQ1 1 2 48IN UT OUT UTPAR S I TSyb l a t D si t nRE AYSK1 KK9 87 56 F 1C 5 DC RdK1112 H 33 1 05 0K2 K68 8 050 SP T VDC RdK1013 K 6 H 33 1 04 0DtF 1C 5V C RdE3 2 C0 00Z 5 V % 4 0WPN 30 V SC 7 0D ENOTE: Components and valuestoned in gray warrant yourattention; parenthesized valuesapply to serial numbersLK1001-LK1989. non-parenthasized values apply toserial numbers LK1990 andabove.Amplifier1413Control and Balance Control1516Control and Balance ControlBALANCE CONTROLPCB 048478CONTROL PCB 048479BALANCE CONTROLPARTS LISTSymbol Part DescriptionRESISTORS and POTENTIOMETERSR1 134475 Balance ControlCONTROLPARTS LISTSymbol Part DescriptionDIODESD1-D32 070047 SIG, 75V, 150mA, 1N4148INTEGRATED CIRCUITSIC1 133189 Dual Op-Amp. MC33178PIC2 133108 5V Regulator MC7805CTRELAYSK1-K3 087050 SPST, 5VDC, Reed,HE3321A0400RESISTORSR1 134476 Volume ControlSWITCHESS1 146238 Input SwitchS2 146239 Mode SwitchTRANSISTORSQ1,Q2 132224 PNP, MPS41261718TrebleBassBASSPARTS LISTSymbol Part DescriptionSWITCHESS1.S2 146240 Bass/Treble SwitchTREBLEPARTS LISTSymbol Part DescriptionSWITCHESS4.S5 146240 Bass/Treble SwitchBASS PORTION OFPCB 0484772019TREBLE PORTION OFPCB 04847721SPEAKER SWITCHPORTION OFPCB 048477SPEAKER SWITCHPARTS LISTSymbol Part DescriptionDIODESD1-D6 070047 SIG DIODE 1N4148SWITCHESS3 146241 Speaker SwitchSpeaker SwitchWARNING: Parts located in the belowshaded area have critical characteristics.Use ONLY replacement parts recommendedby the manufacturer.AC POWER SUPPLYPORTION OF PCB 048471AC POWER SUPPLYPARTS LISTSymbol Part DescriptionCAPACITORC9 061276 Disc Cap, .0047uF, 400VACFUSESF1 089081 Fuse 1A, 2AGRELAYSK1 087054 SPST,12VDC22DC Power SupplyNOTE: Components and valuestoned in gray warrant yourattention; parenthasized valuesapply to serial numbersLK1001-LK1989, non-parenthasized values apply toserial numbers LK1990 andabove.WARNING: Parts located in the belowshaded area have critical characteristics.Use ONLY replacement parts recommendedby the manufacturer.DC POWER SUPPLYPARTS LISTSymbol Part DescriptionDIODESD1.D2 070044 BRIDGE, 400V, 2A23DC POWER SUPPLYPORTION OF PCB 048471Repacking InstructionsIn the event it is necessary to repack theunit for shipment, the unit must be packed exactly asshown below.IMPORTANT - The four plastic feet mustbe attached to the bottom of the unit so they willlocate in the four holes of the bottom pad. Failure todo this will result in shipping damage.If a shipping carton or any of the interiorparts is needed, please call or write the CustomerService Department of Mclntosh Laboratory. Orderparts from the accompanying list by part number.Use the original shipping carton and interiorparts only if they are in good serviceable condition.Qty.121114441Part No. Description033870 Shipping carton only033884 Corner pad033883 Inside carton only033885 Top pad033886 Bottom pad017156 Plastic foot100160 #10-32 x 9/16 Screw104080 #10 Flat washer033915 Shipping carton completewith all the above partsINSIDECARTONBOTTOM PAD10-32x9/16SCREW WITHWASHER (4)BOTTOM COVERUNIT WITH(4) FEET ONTOP PADINSIDECARTONCORNERPADSHIPPINGCARTONC22 PREAMPLIFIERPart No. 040354BE032003Printed in U.S.A.Mclntosh Laboratory, Inc., 2 Chambers Street, Binghamton, NY 139O3Telephone (607) 723-3512