McIntosh-C22-pre-sm1 维修电路原理图.pdf

C 22SERVICE INFORMATIONSTARTING WITH SERIAL NO. 10A01MclNTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORKC 22RadioFans.CN 收音机爱 好者资料库ELECTRICAL SPECIFICATIONSFrequency Response+0.5 to -0.5 dB, 20Hz to 20,000HzDistortionLess than 0.2% at 10 volts outputLess than 0.02% at 3 volts outputInput Sensitivity (phono 1, phono 2, tape head)2 millivolts for 2.5 volts output at 1kHzInput Sensitivity (Microphone)2.5 millivolts for 2.5 volts outputInput Sensitivity (aux, tape, tuner)0.25 volts for 2.5 volts outputHum And Noise (phono 1, phono 2, tape head)74 dB below 10 millivolts inputHum And Noise (aux, tape, tuner)85 dB below rated outputOutput (main)2.5 volts with rated input. Up to 10 voltscan be developed without distortion.Output (tape)0.25 volts with rated input. Phono inputsignal of 10 millivolts produces 1.25 voltsoutput.Output (L & R)1.0 volts with rated input on both channels.A level control adjusts output.Bass Control+20 dB at 20HzTreble Control+20 dB at 20,000HzLP FilterFlat or sharp cutoff below 50Hz (down 30 dB 20Hz).HF FilterFlat or sharp cutoff above 5000Hz (down 30 dB 20,000Hz).RadioFans.CN 收音机爱 好者资料库PREAMP. SECTION154 - 318Unless otherwise specified, resistance values arein ohms, 1/2 watt, and 10% tolerance. Capacitancevalues smaller than 1 are in microfarads (F);values greater than 1 are in picofarads (pF).Resistors marked with * are 1/4W.The terminal numbering of rotary switches and printedcircuit board wires is for reference only.All voltages are measured under the following condi-tions:1. Use of an 11 megohm input impedance VTVM2. All voltages 10% with respect to ground3. AC input at 117 volts, 50/60 cycles4. No signal at input terminals5. Front panel controls at normal positionsSCHEMATIC NOTES1. In early units C3 & 4 were 50F.2. C22s built before 1965 used circuit modulesmade by Erie Electronics. In 1965, we changedto Sprague Electric Co. The Sprague modulesare electrically equivalent to the Erie modulesbut differ mechanically. The newer Spraguemodules are used for replacement when servicingearly C22 units. For data on replacing theold Erie modules with the Sprague modules, referto Mclntosh Service Bulletin #108.3. In early units R76 thru R83 do not appear.4. In early units C35 & 36 do not appear.5. In early units R67 was 50 ohms.POWER SUPPLY154-317REPLACEMENT PARTSAll parts not listed are common items obtain-able from radio parts jobbers.Replacement parts may be obtained when orderedby PART NUMBER from:Mclntosh Laboratory Inc.Customer Service Department2 Chambers StreetBinghamton, New York 13903(telephone 607-723-3512)CAPACITORSSymbol PartNumber Description NumberC3,4 Elect. 100 F 3V 066-047C29 Elect. 40F 200V 066-049C30 Elect. 1000/40/20 /20F 066-03725/200/35o/35ovC31 Elect. 50/50/50 F 066-033350/350/300VC32 Elect. 1200/1200F 066-02930/30VDIODESD1,2 Se. rectifier 070-005D3,4 Si. rectifier 070-014D5,6 Si. rectifier 070-014PUSESF1 Fuse 1 amp 089-002CHOKESL1 ,2 Choke 100 mH . 122-004POTENTIOMETERSR1, 2 Tape equal. (1/2 Dia. ) 134-059R1, 2 Tape equal. (5/8 Dia. ) 134-186R3,4 Bass trim (1/2 Dia. ) 134-059R3,4 Bass trim (5/8 Dia.) 134-186R5 Balance control 134-061R6 Volume control 134-060R7,8,9 Output level (5/8 Dia.) 134-186R7,8,9 Output level (1/2 Dia. ) 134-059RESISTORSR16,17 Low noise 330K 5% 1W 144-005R20,21 Low noise 1.8K 5% 1/2W 144-002R46,147 Low noise 330K 5% 1W 144-005R67 Wirewound 33 ohm 10% 5W 139-007R74,75 Wirewound 7.5 ohm 10% 5W 139-010S1S2S3S4S5S6,7S8S9,10S11S12S13S14S15T1- - -SWITCHESTape jacks switchInput selector switchTape switchComp. switchMode selector switchTreble control switchLoudness switchBass control switchRumble switchH.F. filter switchPower switchPilot lamp switchPhase switchTRANSFORMERS .Power transformerMODULESTreble cutTreble boostBass, upperBass, lowerRumble filterH.P. filterPhono equalizationLAMPS#334 (indicator)Festoon (indicator glass)FRONT PANEL & TRIMFront panelFront panel glassEnd cap, rightEnd cap, leftVolume control knobMode selector knobInput selector knobBalance knobBass control knobTape jacks knobTreble control knobRocker switch knobLevel set knob146-053146-049148-006148-006149-108146-052148-006146-051148-006148-006148-005148-003148-007159-019130-016130-017130-018130-019130-020130-021130-026058-003058-033043-359016-034018-043018-044043-253043-253043-253043-253O43-428043-428043-428090-007090-010MOUNTING SYSTEMShelf bracket (right) 043-592Shelf bracket (left) 043-593Mounting template #100 038-179Hardware package 043-448MISCELLANEOUS ITEMSLine cord 170-021Fuse holder 178-001Shipping carton 033-027Owners manual 038-027Plastic feet 017-041Shorting plug 127-001Indicator glass 016-036Audio cable (6) 170-015Audio cable (1 phone, 170-0161 phono)20C0425S6-8M270SCHEMATIC PART NO. 038-270Be122002