McIntosh-MC2105-pwr-sm 维修电路原理图.pdf

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1、FROM S E R I A L NO. 10M01 TO 26M07MclNTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORKMC 2105RadioFans.CN 收音机爱 好者资料库ELECTRICAL SPECIFICATIONSPOWER OUTPUT:105 RMS watts continuous per channel into 4, 8, or 16 ohmsboth channels operating.HARMONIC DISTORTION:Less than 0.25% at 105 watts pow

2、er output from 20 Hz to 20kHz, both channels operating. Typical performance is lessthan 0.1% at rated power. Distortion decreases as outputis reduced.INTERMODULATION DISTORTION:Less than 0.25% if instantaneous peak power output is 210watts or less per channel with both channels operating forany comb

3、ination of frequencies 20 Hz to 20 kHz.FREQUENCY RANGE:20 Hz to 20 kHz +0, -0.1 dB at rated power.15 Hz to 60 kHz +0, -0.5 dB at rated power.10 Hz to 100 kHz +0, -3.0 dB at rated power.NOISE AND HUM:90 dB or more below rated output.OUTPUT IMPEDANCE:4, 8, and 16 ohmsOUTPUT VOLTAGES:25 volts (connect

4、to 8 ohm outputs.)DAMPING FACTOR:18 at 4 ohms output13 at 3 ohms output10 at 16 ohms outputINPUT IMPEDANCE:200,000 ohmsINPUT SENSITIVITY:0.5 volts. Level control provided for higher input voltage.POWER REQUIREMENTS:117 volts AC 50-60 Hz, 90 watts at zero signal output, 450watts at rated output.Radio

5、Fans.CN 收音机爱 好者资料库INPUT SECTION PRINTED CIRCUIT BOARD 043-795LOCATION OF TRANSISTORS NOT ON PRINTED CIRCUIT BOARDSINPUT SECTIONMC 2I05154-292INPUT SECTION PRINTED CIRCUIT BOARD 043-795HEAVY LINE SHOWS PRIMARY SIGNAL PATHLEFT CHANNELPOWER OUTPUT SECTION PRINTED CIRCUIT BOARD 043-805RIGHT CHANNELPOWER

6、 OUTPUT SECTION PRINTED CIRCUIT BOARD 043-805POWER OUTPUTSECTION154- 366MC 2105METER SECTIONMC 2105154-294METER SECTION PRINTED CIRCUIT BOARDSCHEMATIC NOTES1. Unless otherwise specified: Resistance values are in ohms, 1/2 watt, and 10% tolerance;capacitance values smaller than 1 are in microfarads (

7、f) ; capacitance values greaterthan 1 are in picofarads (pF); inductors are in microhenries (H).2. Printed circuit board components are outlined on the schematics by dotted lines. Thecircled numbers on the dotted lines correspond to the numbers on the PC board layouts.I 3. The heavy lines on the sch

8、ematics denote the primary signal path.4. The terminal numbering of rotary switches is for reference only.5. All voltages indicated on the schematics are measured under the following conditions:a. Use of an 11 megohm impedance VTVM.b. All voltages 10% with respect to chassis ground.c. Ho signal at i

9、nput terminals.d. AC input at 117 volts AC, 50/60Hz.e. Front panel controls at:Left GainMeter RangeRight GainSpeakersPowerFULLY CCWOFFFULLY CCWONOH6. R125, R126, R127, and R128 are 2.7K in early units.7. R215 and R216 are 1.2K and R217 and R218 are 22K in early units.8. In units with serial Nos belo

10、w 10M40: C111, C112, C113, and C114, are used; C107, C108,C109. and C110 (part No. 064-044) are .047; The emitter of Q113 and Q114 is connected asshown by the dotted line; R139 and Rl40 part Ho. 139-061) are used.9. In units with serial Nos below 11M93: Rl59 and R160 are not used; R143, R144, R145,

11、R146,R147, R148, R149, and R150 are .15W (part Ho. 139-055); pins Ho. 12 and 9 on PC boardsare connected as shown by dotted line.10. C125 and C126 are used in units with serial Nos from 11M93 to 13M05.11. R137f R138, R141, and Rl42 are 75ohm 9W 10% (part No. 139-070) and R119 and R120 are 2751in ear

12、ly units.12. In units with serial Nos below 20M01; R107, R108, C105, and C106 are used; ferrite beads(part No. 076-010) are not used.13. In units with serial Nos below 20M50 R161 and R162 are not used and pin l4 isconnected as shown by dotted line.14. R155 and R156 are 8.2ohm 10% in units with seria

13、l Nos from l0M40 to 21M13.15. R109, 110 is 47K in units with serial Nos from 11M93 to 23M25.16. In units with serial No a below 10M40; C117 and Cll8 are .0012. In units with aerialNos from 10M40 to 23M25, C117 and Cll8 are not used.17. In units with serial Nos below 23M25, C115 and C116 are .0012.18

14、. Adjust meter calibration controls R213 (left channel) and R214 (right channel) sooutput meters indicate +3dB when meter range switch is in the 0 position and theamplifier is delivering 105 watts output.METER SECTION PRINTED CIRCUIT BOARD 043-711REPLACEMENT PARTSAll parts not listed are common item

15、s obtain-able from radio parts jobbers.Replacement parts may be obtained when orderedby PART NUMBER from:Mclntosh Laboratory Inc.Customer Service Department2 Chambers StreetBinghamton, Hew York 13903(telephone 607-723-3512)CAPACITORSSymbolNumber DescriptionC1,2 Mylar ,22uF 250VC3,4 Mylar .47uF 250VC

16、5,6 Elect. 500uF 16VC9,10 Elect. l0uF 25V NPC11,12 Elect. 100uF 15VC101,102 Elect. 330uF 3VC121,122 Elect. 10uF 50VC201,202 Mylar .47uF 250VC203,204 Elect. 100uF 3VC301 Elect. 39,000uF 40VC302 Elect. 39,000uF 40VC303 Elect. 80/80/l50/50uF200/200/150/150VDIODESD101,102 Si. signal diodeD103,104 Si. re

17、ference diodeDl05,106 Si. signal diodeD107,108 Si. signal diodeD201,202 Ge. signal diodeD203,204 Ge. signal diodeD301,302 Rectifier Assy (Black)D303,304 Rectifier Assy (Red)D305 Si. rectifierD306 Si. rectifierPUSESP301 Fuse 5 ampere Slo-BloCHOKESL101,102 Choke 75uHMETERSM201,202 Meter (power level)P

18、artNumber064-043064-045066-107066-005066-127066-105066-113064-045066-047066-119066-119066-095070-022070-040070-022070-022070-003070-003043-903043-904070-031070-031089-007122-013124-013Q1,2Q3,4Q5,6Q101,102Q103,104Q105,106Q107,108Q109,110Q111,112Q113,114Q115,116Q115,116Q117,118Q117,118Q119,120Q119,120

19、Q121,122Q121,122Q123,124Q123,124Q125,126Q125,126Q201,202R1, 2R213,2l4R117,118R137,138R141, 142R143,144R145,146R147,148R149,150R159-160R301,302- TRANSISTORSSi. NPN transistorSi. NPN transistorSi. PNP transistorSi. PNP transistorSi. PNP transistorSi. NPN transistorSi. NPN transistorSi. PNP transistorS

20、i. NPN transistorSi. PNP transistorSi. NPN transistor(Below Serial No. 20M01)Si. NPN transistor(Above Serial No. 20M01)Si. NPN transistor(Below Serial No. 20M01)Si. NPN transistor(Above Serial No. 20M01)Si. NPN transistor(Below Serial No. 20M01)Si. NPN transistor(Above Serial No. 20M01)Si. NPN trans

21、istor(Below Serial No. 20M01)Si. NPN transistor(Above Serial No. 20M01)Si. NPN transistor(Below Serial No. 20M01)Si. NPN transistor(Above Serial No. 20M01)Si. NPN transistor(Below Serial No. 20M01)Si. NPN transistor(Above Serial No. 20M01)Si. NPN transistorPOTENTIOMETERSGain controlsMeter calibratio

22、n adjustRESISTORSWirewound 3.6K 5% 5WWirewound .56 ohms 5WWirewound .56 ohms 5WWirewound .33 ohms 5WWirewound .33 ohms 5WWirewound . 33 ohms 5WWirewound . 33 ohms 5WWirewound .33 ohms 5WThermistor132-054132-054132-031132-031132-031132-515132-021132-032132-038132-039132-518132-541132-518132-541132-51

23、7132-541132-517132-541132-517132-542132-517132-542132-054134-191134-120139-065139-061139-061139-071139-071139-071139-071139-071144-01231S101S201S301S302,303T101,102T301SWITCHESInput coupling switchSpeaker switchMeter range switchPower on-off switchThermal cut-outTRANSFORMERSOutput transformerPower t

24、ransformerFRONT PANEL AND TRIMFront panelFront panel end capsKnobs (all controls )LAMPS#1866 (for wording)#1888 (for meters)PANLOC SYSTEMShelf bracket (right)Shelf bracket (left)Mounting template #300Hardware packageMISCELLANEOUS ITEMSPlastic feetShipping cartonOwners manualLine cord148-006146-103146-109146-102153-007043-649043-693043-735018-112043-253058-014058-029043-678043-679038-161043-691017-041043-793038-163170-0215C01106S-M9321JGSCHEMATIC PART NO. 038-321