McIntosh MC 2205 Service Manual

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MC2205 PERFORMANCE LIMITS & RATINGS PERFORMANCE Mc Intosh audio power rat i ngs are in ac- cordance with the Federal Trade Commis- sion Regulation of November 4, 1974 con- cerning power output claims for ampli- fiers used in home entertainment pro- ducts. POWER OUTPUT STEREO: 200 watts minimum sine wave continuous aver- age power output, per chan- nel, both channel's operating into 1 ohm, 2 ohms, 4 ohms, or 8 ohms load impedance, which i s: 14.1 volts RMS across 1 ohm 20.0 volts RMS across 2 ohms 28.3 volts RMS across 4 ohms 40.0 volts RMS across 8 ohms MONO: 400 watts minimum sine wave continuous average power output into 0.5 ohm, 1 ohm, 2 ohms, or 4 ohms load imped- ance, which is: 14.1 volts RMS across 0.5 ohm 20.0 volts RMS across 1 ohm 28.3 volts RMS across 2 ohms 40.0 volts RMS across 4 ohms OUTPUT LOAD IMPEDANCE STEREO: 1 ohm, 2 ohms, 4 ohms, and 8 ohms; separate terminals are provided for each output MONO: 0.5 ohm, 1 ohm, 2 ohms, and 4 ohms; obtained by con- necting together the appro- priate terminals of both chan- nel s RATED POWER BAND 20 Hz to 20,000 Hz TOTAL HARMONIC DISTORTION STEREO: 0.1% maximum harmon- ic distortion at any power level from 250 milliwatts to 200 watts per channel from 20 Hz to 20,000 Hz, both channels operat ing MONO: 0.1% maximum harmonic distortion at any power lev- el from 250 milliwatts to 400 watts from 20 Hz to 20,000 Hz STEREO: 0.1% maximum if instantaneous peak power output is 400 watts or less per channel with both channels opera- ting for any comb i nat ion of frequen- cies, 20 Hz to 20,000 Hz MONO: 0.1% maximum if instantaneous peak power output is 800 watts or less for any combination of frequencies, 20 Hz to 20,000 Hz FREQUENCY RESPONSE (at one watt output) 20 Hz to 20,000 Hz, +0 -0.25 dB 10 Hz to 100,000 Hz +0 -3.0 dB NOISE AND HUM 95 dB below rated output RATINGS OUTPUT VOLTAGES 25 volts for distribution lines DAMPING FACTOR STEREO: 16 at I ohm output, 50 at 2 ohms output, 30 at 4 ohms output, 16 at 8 ohms output MONO: 16 at 0.5 ohms, 50 at 1 ohm, 30 at 2 ohms, and 16 at 4 ohms output INPUT IMPEDANCE 100,000 ohms INPUT SENSITIVITY Switchable: 0.75 volt or 2.5 volts- Level control provided for higher input voltages POWER REQUIREMENTS 120 volts 50/60HZ, 70 to 550 watts. INTERMODULATION DISTORTION

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MC2205 LEFT INPUT AC LINE BLOCK DIAGRAM RIGHT/MONO INPUT LEFT SPEAKER OUTPUT RIGHT SPEAKER OUTPUT

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MC2205 Q241 ,242 Q301 Q302 Q303 Q304 Q305 Q306 Q307 Q308 IC101 , 102 IC 103, 104 IC105,106 IC201 ,202 R105, 106 R125, 126 R241 ,242 R201-1,202-1 R135,136 R137,138 R 139, 140 R141 , 142 R229,230 R249,250 R251 ,252 R255,256 R257,258 R279,280 R281 ,282 R283,284 R285,286 R287,288 R289,290 R291 ,292 R295,296 R297,298 R299 R323 R200-1 R203-1,204-1 S i , PNP trans i stor S i . NPN trans i stor S i . NPN trans i stor Power t rans i stor S i . PNP trans i stor S i . NPN trans i stor S i . NPN trans i stor Si . NPN transistor S i . NPN trans i stor INTEGRATED CIRCUITS I ntegrated c i rcu i t I n tegrated c i rcu i t I ntegra ted c i rcu i t I ntegrated c i rcu i t POTENTIOMETERS dB Adjust Log Adjust Bias Adjust Ga i n control s RESISTORS Fi 1m 2.49K 2% 1 /4W Film 649R 2% 1/4W Fi 1m 274R 2% 1 /4W Thermi s tor Fi 1m 365n 1% 1/4W Film 909R 1% 1/4W Film 82. 5R 1% 1/4W Fi 1m 82.5R 1% 1/4W Film 909R 1% 1 /4W Thermistor W i rewound . 1 5R 5W W i rewound . 1 5R 5W W i rewound . 1 5R 5W W i rewound . 1 5R 5W W i rewound . 1 5R 5W W i rewound . 1 5R 5W Therm i stor Fi 1m 61 .9K 2% 1/4W Film 38. 3K 2% 1/4W Thermi s tor Film 38. 3K 2% 1 /4W Wirewound 220R 2W 132-165 132-090 132-078 132-079 132-096 132-090 132-143 132-090 132-143 133-037 133-037 133-037 133-037 134-294 134-293 134-298 134-273 144-049 144-050 144-048 144-075 144-071 144-073 144-072 144-072 144-073 144-074 139-105 139-105 139-105 139-105 139-105 139-105 144-074 144-077 144-076 144-012 144-076 139-076 S101 S201 S301 S302,303 K301 T201 ,202 T301 SWITCHES Meter range swi tch Power on-off swi tch Speaker sw i tch Thermal cutout RELAY Speaker control TRANSFORMERS Output transformer Power transformer FRONT PANEL & TRIM Front panel Front pane l end caps Knobs (al l control s) LAMPS #1866 Panel & meters #7382 Normal & limit #7381 Hold, dB & watts PANLOC SYSTEM Shelf bracket (right) Shelf bracket ( left) Mounting template #300 Hardware package MISCELLANEOUS ITEMS Plast ic feet Sh i pp i ng carton Owners manua l Line cord Fuse hol der , 146-180 146-167 146-167 153-017 087-017 044-636 044-637 044-634 018-173 090-156 058-014 058-061 058-062 043-678 043-679 038-244 044-871 017-218 045-008 038-950 170-021 178-001