McIntosh-MC-2105-Service-Manual 电路图 维修手册.pdf

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1、FROM S E R I A L NO. 10M01 TO 26M07 MclNTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORK MC 2105 RadioFans.CN 收音机爱 好者资料库 ELECTRICAL SPECIFICATIONS POWER OUTPUT: 105 RMS watts continuous per channel into 4, 8, or 16 ohms both channels operating. HARMONIC DISTORTION: Less than 0.25% at 105

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

3、ing for any combination 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 ohms OUTPUT VO

4、LTAGES: 25 volts (connect to 8 ohm outputs.) DAMPING FACTOR: 18 at 4 ohms output 13 at 3 ohms output 10 at 16 ohms output INPUT IMPEDANCE: 200,000 ohms INPUT SENSITIVITY: 0.5 volts. Level control provided for higher input voltage. POWER REQUIREMENTS: 117 volts AC 50-60 Hz, 90 watts at zero signal ou

5、tput, 450 watts at rated output. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 INPUT SECTION PRINTED CIRCUIT BOARD 043-795 LOCATION OF TRANSISTORS NOT ON PRINTED CIRCUIT BOARDS INPUT SECTION MC 2I05154-292 INPUT SECTION PRINTED CIRCUIT BOARD 043-795 HEAVY LINE SHOWS PRIMARY SIGNAL PATH LEFT CHANNE

6、L POWER OUTPUT SECTION PRINTED CIRCUIT BOARD 043-805 RIGHT CHANNEL POWER OUTPUT SECTION PRINTED CIRCUIT BOARD 043-805 POWER OUTPUT SECTION 154- 366MC 2105 METER SECTION MC 2105154-294 METER SECTION PRINTED CIRCUIT BOARD SCHEMATIC NOTES 1. Unless otherwise specified: Resistance values are in ohms, 1/

7、2 watt, and 10% tolerance; capacitance values smaller than 1 are in microfarads (f) ; capacitance values greater than 1 are in picofarads (pF); inductors are in microhenries (H). 2. Printed circuit board components are outlined on the schematics by dotted lines. The circled numbers on the dotted lin

8、es correspond to the numbers on the PC board layouts. I 3. The heavy lines on the schematics 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 me

9、gohm impedance VTVM. b. All voltages 10% with respect to chassis ground. c. Ho signal at input terminals. d. AC input at 117 volts AC, 50/60Hz. e. Front panel controls at: Left Gain Meter Range Right Gain Speakers Power FULLY CCW OFF FULLY CCW ON OH 6. R125, R126, R127, and R128 are 2.7K in early un

10、its. 7. R215 and R216 are 1.2K and R217 and R218 are 22K in early units. 8. In units with serial Nos below 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 as shown by the dotted line; R139 and Rl40 part Ho

11、. 139-061) are used. 9. In units with serial Nos below 11M93: Rl59 and R160 are not used; R143, R144, R145, R146, R147, R148, R149, and R150 are .15W (part Ho. 139-055); pins Ho. 12 and 9 on PC boards are connected as shown by dotted line. 10. C125 and C126 are used in units with serial Nos from 11M

12、93 to 13M05. 11. R137f R138, R141, and Rl42 are 75ohm 9W 10% (part No. 139-070) and R119 and R120 are 2751 in early 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 R

13、162 are not used and pin l4 is connected as shown by dotted line. 14. R155 and R156 are 8.2ohm 10% in units with serial 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 aerial

14、 Nos from 10M40 to 23M25, C117 and Cll8 are not used. 17. In units with serial Nos below 23M25, C115 and C116 are .0012. 18. Adjust meter calibration controls R213 (left channel) and R214 (right channel) so output meters indicate +3dB when meter range switch is in the 0 position and the amplifier is

15、 delivering 105 watts output. METER SECTION PRINTED CIRCUIT BOARD 043-711 REPLACEMENT PARTS All parts not listed are common items obtain- able from radio parts jobbers. Replacement parts may be obtained when ordered by PART NUMBER from: Mclntosh Laboratory Inc. Customer Service Department 2 Chambers

16、 Street Binghamton, Hew York 13903 (telephone 607-723-3512) CAPACITORS Symbol Number Description C1,2 Mylar ,22uF 250V C3,4 Mylar .47uF 250V C5,6 Elect. 500uF 16V C9,10 Elect. l0uF 25V NP C11,12 Elect. 100uF 15V C101,102 Elect. 330uF 3V C121,122 Elect. 10uF 50V C201,202 Mylar .47uF 250V C203,204 Ele

17、ct. 100uF 3V C301 Elect. 39,000uF 40V C302 Elect. 39,000uF 40V C303 Elect. 80/80/l50/50uF 200/200/150/150V DIODES D101,102 Si. signal diode D103,104 Si. reference diode Dl05,106 Si. signal diode D107,108 Si. signal diode D201,202 Ge. signal diode D203,204 Ge. signal diode D301,302 Rectifier Assy (Bl

18、ack) D303,304 Rectifier Assy (Red) D305 Si. rectifier D306 Si. rectifier PUSES P301 Fuse 5 ampere Slo-Blo CHOKES L101,102 Choke 75uH METERS M201,202 Meter (power level) Part Number 064-043 064-045 066-107 066-005 066-127 066-105 066-113 064-045 066-047 066-119 066-119 066-095 070-022 070-040 070-022

19、 070-022 070-003 070-003 043-903 043-904 070-031 070-031 089-007 122-013 124-013 Q1,2 Q3,4 Q5,6 Q101,102 Q103,104 Q105,106 Q107,108 Q109,110 Q111,112 Q113,114 Q115,116 Q115,116 Q117,118 Q117,118 Q119,120 Q119,120 Q121,122 Q121,122 Q123,124 Q123,124 Q125,126 Q125,126 Q201,202 R1, 2 R213,2l4 R117,118

20、R137,138 R141, 142 R143,144 R145,146 R147,148 R149,150 R159-160 R301,302 - TRANSISTORS Si. NPN transistor Si. NPN transistor Si. PNP transistor Si. PNP transistor Si. PNP transistor Si. NPN transistor Si. NPN transistor Si. PNP transistor Si. NPN transistor Si. PNP transistor Si. NPN transistor (Bel

21、ow 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 transistor (Below Serial No. 20M01) Si. NPN transis

22、tor (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 transistor POTENTIOMETERS Gain controls Meter calibration adjust RESISTORS Wirewound 3.

23、6K 5% 5W Wirewound .56 ohms 5W Wirewound .56 ohms 5W Wirewound .33 ohms 5W Wirewound .33 ohms 5W Wirewound . 33 ohms 5W Wirewound . 33 ohms 5W Wirewound .33 ohms 5W Thermistor 132-054 132-054 132-031 132-031 132-031 132-515 132-021 132-032 132-038 132-039 132-518 132-541 132-518 132-541 132-517 132-

24、541 132-517 132-541 132-517 132-542 132-517 132-542 132-054 134-191 134-120 139-065 139-061 139-061 139-071 139-071 139-071 139-071 139-071 144-012 31 S101 S201 S301 S302,303 T101,102 T301 SWITCHES Input coupling switch Speaker switch Meter range switch Power on-off switch Thermal cut-out TRANSFORME

25、RS Output transformer Power transformer FRONT PANEL AND TRIM Front panel Front panel end caps Knobs (all controls ) LAMPS #1866 (for wording) #1888 (for meters) PANLOC SYSTEM Shelf bracket (right) Shelf bracket (left) Mounting template #300 Hardware package MISCELLANEOUS ITEMS Plastic feet Shipping carton Owners manual Line cord 148-006 146-103 146-109 146-102 153-007 043-649 043-693 043-735 018-112 043-253 058-014 058-029 043-678 043-679 038-161 043-691 017-041 043-793 038-163 170-021 5C01106S-M9321JG SCHEMATIC PART NO. 038-321