McIntosh MC2300 Power Amplifier Service Information.pdf

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1、HIHntosii MC2300 SERVICE INFORMATION STARTING WITH SERIAL NO. 1Y001 McIntosh laboratory inc. 2 chambers street Binghamton, new york 2300 ELECTRICAL SPECIFICATIONS PERFORMANCE McIntosh audio power ratings are in accordance with the Federal Trade Commisssion Regulation of Novem ber 4, 1974 concerning

2、power output claims for ampli fiers used in home entertainment products. POWER OUTPUT STEREO 300 watts minimum sine wave continuous average power output, per channel, both channels operating into 0.5 ohm, 1 ohm, 2 ohms, 4 ohms, 8 ohms, or 16 ohms load impedance, which is: 12.2 volts RMS across 0.5 o

3、hm 17.3 volts RMS across 1 ohm 24.5 volts RMS across 2 ohms 34.6 volts RMS across 4 ohms 49.0 volts RMS across 8 ohms 69.3 volts RMS across 16 ohms MONO 600 watts minimum sine wave continuous average power output into 0.25 ohm, 0.50 ohm, 1 ohm, 2 ohms, or 8 ohms load im pedance, which is: 12.2 volts

4、 RMS across 0.25 ohm 17.3 volts RMS across 1 ohm 36.6 volts RMS across 2 ohms 49.0 volts RMS across 4 ohms 69.3 volts RMS across 8 ohms OUTPUT LOAD IMPEDANCE iSTEREO 0.5 ohm, 1 ohm, 2 ohms, 4 ohms, 8 ohms and 16 ohms; separate terminals are pro vided for each output MONO 0.25 ohm, 0.5 ohm, 1 ohm, 2

5、ohms, 4 ohms and 8 ohms; separate terminals are pro vided for each output RATED POWER BAND 20 Hz to 20,000 Hz TOTAL HARMONIC DISTORTION STEREO 0.25% maximum harmonic distortion at any power level from 250 milliwatts to 300 watts per channel from 20 Hz to 20,000 Hz, both channels operating MONO 0.25%

6、 maximum harmonic distortion at any power level from 250 milliwatts to 600 watts from 20 Hz to 20,000 Hz OUTPUT POWER MONITOR METER Meter is calibrated to read +3.0 dB when amplifier produces 300 watts. Meter range switch is provided to increase meter sensitivity by 10 dB or 20 dB. Calibra tion accu

7、racy at 0 dB reading is 2.0% at all frequen cies; meter range accuracy is 5.0% INTERMODULATION DISTORTION STEREO 0.25% if instantaneous peak power output is 600 watts or less per channel with both channels operating for any combination of frequencies, 20 Hz to 20,000 Hz MONO 0.25% if instantaneous p

8、eak power output is 1200 watts or less per channel with both channels operating for any combination of frequencies, 20 Hz to 20,000 Hz FREQUENCY RESPONSE (at 1 watt output) STEREO 20 Hz to 20,000 Hz, +0 -0.5 dB; 1, 4, 8 or 16 ohms; +0 1.0 dB; 0.5 or 2 ohms 12 Hz to 35,000 Hz, +0-1.5 dB MONO 20 Hz to

9、 20,000 Hz, +0 -0.5 dB; 1, 4, 8 Or 16 ohms; + 0; 1.0 dB; 0.25 or 1.0 ohm 12 Hz to 35,000 Hz, +0-1.5 dB NOISE AND HUM 90 dB below rated output RATINGS OUTPUT VOLTAGES 25 volts, stereo and mono; 70 volts, stereo and mono for distribution lines DAMPING FACTOR 27 at 0.5 ohm output, 50 at 1 ohm output, 2

10、9 at 2 ohms output, 21 at 4 ohms output, 14 at 8 ohms output INPUT IMPEDANCE 200,000 ohms INPUT SENSITIVITY 0.5 volt. Level control provided for higher input voltage GENERAL INFORMATION POWER REQUIREMENTS 120 volts 50/60 Hz, 160 watts at zeijo signal output, 1400 watts at rated output SEMICONDUCTOR

11、COMPLEMENT 46 silicon transistors 16 diodes, rectifiers and bridge rectifiers MECHANICAL INFORMATION SIZE Front panel measures 19 inches wide (48.26 cm) by IOV2 inches high (26.67 cm). Chassis measures 17 inches wide (43.18 cm) by 10 inches high (25.4 cm) by 17 inches deep (43.18 cm), including conn

12、ectors. Clearance in front of mounting panel including knobs 2 inches (5.08 cm) FINISH Front panel is anodized gold and black. Chassis is black baked enamel. MOUNTING Standard 19 (48.26 cm) rack mounting WEIGHT 128 pounds (58.06 kg) net, 143 pounds (64.86 kg) in shipping carton - -.-.-. METER OUTPUT

13、 MONITOR CLASS B OUTPUT STAGE DRIVER METER MC 2300 2300 BLOCK DIAGRAM MC 2 300 V QI37 top QI33 MIDDLE Q129 BOTTCM MC 2300 INPUT PC BOARD 044-650 LEFT INPUT RIGHT/MONO GAIN S 7= u. _:J I RIGHT/MONO INPUT | 3.3K . % CM 0 - 0 - li. - 3 0 capacitance values smaller than 1 are in microfarads (pF); capaci

14、tance values greater than 1 are in picofarads (pF); inductors are in microhenries (pH). 2. Printed circuit board components are outlined on the schematics by dotted lines. The circled numbers on the dotted lines correspond to the numbers on the PC board layouts. 3. The heavy lines on the schematics

15、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. No signal at inp

16、ut terminals. d. AC input at 120 volts AC, 50/60Hz. e. Front panel controls at: Left Gain Meter Range Right/Mono Gain Power FULLY CCW FULLY CCW FULLY CCW ON 6. In units with Serial No.s below 1Y110: R137, R138, R14I and R142 are lOfi 10% 1/2W. 7. In units with Serial No.s below 1Y329: R213 and R214

17、are 5K. When R213 and R214 are 5K pots, R227 and R228 are used. 8. In early units: C9 and CIO are lOpF; R23, R24, R171, R172, R173, R174, C306 and C307 are not used and C205 and C206 are .OlpF. 9. In units with Serial No.s below 2Y160: C5 and C6 were 680pF 25V 10. In early units: D305, S302, S303, S

18、304, S305, R313, S308, and S309 are not used. 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: McIntosh Laboratory, Inc. Customer Service Department 2 Chambers Street Binghamton, New York

19、 13903 (telephone 607-723-3512) CAPACITORS Symbol Number Description Part Number C3,4 Mylar 47pF 250V 064-045 C5,6 Elect. 470pF 25 V 066-228 o O Elect. 1 .5pF 36V 066-158 Cl 1 , 12 Elect. lOOpF 16V 066-227 C101,102 Elect. 330pF 3 V 066-105 C121,122 Elect. 150pF 63 V 066-205 C201,202 Mylar .47pF 250V

20、 064-045 C203.204 Elect. lOOpF 1 6V 066-227 C301,302 Elect. 39000pF 40V 066-119 C303.304 Elect. 39000pF 40V 066-119 C305 Elect. 80/80/150/50pF 200/200/150/150V 066-095 DIODES D101,102 Si. signal d i ode 070-047 D103,1 Oh Bias diode 070-046 D105,106 Si. signal d i ode 070-047 D107.108 Si. signal d io

21、de 070-047 D201,202 Ge. signal d iode 070-052 D203.204 Ge. signal d i ode 070-052 D301,302 Rectifier bridge 070-050 D303.304 Si. rectifier 070-031 TRANSISTORS Q1,2 Si. NPN transistor 1 32-092 Q3,4 Si. NPN transistor 1 32-092 Q5,6 Si. PNP transistor 132-056 Q101,102 Si. PNP transistor 132-056 Q103,10

22、4 Si. PNP t ransistor 132-056 Q105,106 Si. PNP trans ? stor 132-028 Q107,108 Si. NPN transistor 132-021 Q109.110 Si. PNP transistor 132-032 Ql 1 1 ,112 Si. NPN transistor 132-038 Q113,114 Si. PNP transistor 132-039 Q115.116 Si. NPN transistor 132-070 Ql 17,118 Si. NPN transistor 132-070 Ql 19,120 Si

23、. NPN transistor 132-670 Ql 21 ,122 Si. NPN transistor 132-070 Ql 23,124 Si. NPN transistor 132-070 Ql25,126 Si. NPN transistor 132-070 Ql27,128 Si. NPN transistor 132-070 Ql 29,130 Si. NPN transistor 132-070 Ql31,132 Si. NPN transistor 132-070 Ql 33,134 Si. NPN transistor 132-070 Ql35,136 Si. NPN t

24、ransistor 132-070 Ql37,138 Si. NPN transistor 132-070 Q201,202 Si. NPN transistor 132-095 POTENTI0METERS R1 Left gain control 134-233 R2 Right/Mono gain control 134-233 R213,214 Meter adjust 134-257 RESISTORS R117,118 Wirewound 3.6k 5% 5W 139-096 R143,144 Wirewound .56ft 5W 139-081 R145,146 Wirewoun

25、d .56ft 5W 139-081 R147,148 Wirewound .33ft 5W 139-080 R149.150 Wirewound .33ft 5W 139-080 R151,152 Wirewound .33ft 5W 139-080 R153.154 Wirewound ,33ft 5W 139-080 R155.156 Wirewound .33ft 5W 139-080 R157,158 Wirewound .33ft 5W 139-080 R159,160 Wirewound .33ft 5W 139-080 RI61,162 Wirewound .33ft 5W 1

26、39-080 R163,164 Wirewound .33ft 5W 139-080 R165,166 Wirewound .33ft 5W 139-080 R167,168 Wirewound .33ft 5W 139-080 R301,302 Wirewound 3.6ft 5W 139-013 R307.308 Thermistor 144-012 R309.310 Therm!stor 144-012 R3 1 3 Wirewound 139-013 METERS M201,202 Meter (Power level) 124-018 SWITCHES SI Mono/Stereo

27、switch 148-019 S201 Meter range switch 146-152 S301 S302,303 S304.305 S306.307 T201,202 T301 CB301 Power on-off switch Thermal cut-out Thermal cut-out Thermal cut-out TRANSFORMERS Audio autoformer Power transformer CIRCUIT BREAKER Circuit breaker 20A LAMPS #1866 (meter) Pilot 1 amp FRONT PANEL & TRI

28、M Front panel Side frame (right) Side frame (left) Hand 1es Left gain knob Right/Mono gain knob Meter range knob Meter bezel MISCELLANEOUS ITEMS Shipping carton Owners manual AC line cord Hardware package Coo ling fan Cooling fan guard 20C1025S7 153-012 153-015 153-013 153-01 I 044-244 044-242 088-006 058-014 058-040 002-345 043-830 043-831 018-152 090-106 090-106 090-106 020-022 044-379 038-662 170-038 044-240 098-144 098-143 -M4808-3