McIntosh-MC-2205-Service-Manual 电路图 维修手册.pdf

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1、MC 22O5 SERVICE INFORMATION MclNTOSH L A B O R A T O R Y INC. BINGHAMTON, NEW YORK 13903 P O W E R A M P L I F I E R STARTING WITH SERIAL NO. AX1001 038-980 RadioFans.CN 收音机爱 好者资料库 MC2205 PERFORMANCE LIMITS separate terminals are provided for each output MONO: 0.5 ohm, 1 ohm, 2 ohms, and 4 ohms; obt

2、ained 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 m i l l i w a t t s to 200 watts per channel from 20 Hz to 20,000 Hz, both channels oper

3、at 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

4、 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

5、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 c

6、ontrol provided for higher input voltages POWER REQUIREMENTS 120 volts 50/60HZ, 70 to 550 watts. INTERMODULATION DISTORTION RadioFans.CN 收音机爱 好者资料库 MC2205 LEFT INPUT AC LINE BLOCK DIAGRAM RIGHT/MONO INPUT LEFT SPEAKER OUTPUT RIGHT SPEAKER OUTPUT RadioFans.CN 收音机爱 好者资料库 I N T E R C O N N E C T I O N

7、RIGHT/MONO INPUT LEFT INPUT LEFT CHANNEL OUTPUT HEADPHONE 1. Unless otherwise spec ified: Resistance values are in ohms, 1/4 watt, and 10% to 1erance; capacitance values sma llr than 1 a re in microfarads (F) : capacitance values greater than 1 are in picofarads (pF); inductors are in microhenries (

8、H). 2 . Printed c i r c u i t board components a re ou t1i ned on the schema tics by dotted lines. The c i rcled numbers on the dotted l i n e s correspond to the numbers on the PC board layouts. 3. The heavy li nes on the schema tics denote the pr ima ry signal path. 4. The terminal number ing of r

9、otary switches is for reference only. 5. A l l voltages i nd i cated on the schemat i cs a re measu red under the fo11owi ng cond i t i ons; a. Use of an 11 megohm impedance VTVM. b. A l l voltages 10% with respect to chassis ground. c. No signal at input terminals. d. AC input at 120 volts AC, 50/6

10、0Hz. e. Front pane l con t rols at: Rear panel swi tches a t: Left Gain FULLY CCW Input Level 0.75V Meter Range WATTS Mode S tereo Right/Mono Gain FULLY CCW Power Guard Normal Speakers ON Power ON 6. Relay K301 shown in energized pos i t i on. 7. Meter adjustments: A m p l i f i e r must be working

11、properly to adjust meters. Ope rate a m p l i f i e r at f u l l power (40V rms) into 8 ohm loads with 1 KHz input signal. a. Set METER RANGE switch to WATTS. b. Adj us t pot en t i ometer R125 on meter board for a reading of 200 watts on the left meter. c. Adjust R126 for a reading of 200 watts on

12、the r i g h t meter. d. Set METER RANGE switch to 0 dB e. Adjust potenti ometer R105 on meter board for a reading of 0 on the DECIBEL scale of the left meter. f. Adjust RI06 for a reading of 0 on the right meter. 8. Power a m p l i f i e r bias adjustment: Operate MC 2205 at 120 volts l i n e input

13、with no input signal. Measure the input power (approximately 50 watts) or current (approximately O.4 amps). The bias potentiometers R241 & R242 are located on the power output PC boards. a. Turn both bias potentiometers f u l l ccw b. Rotate bias ad jus tment cw to the point where the l i n e input

14、power or current begins to i ncrease then back off s l i g h t l y to the point where the line in put reaches its l owest va l ue . c . Repeat step b for each channel independently. SCHEMATIC NOTES MC2205 M C 2 2 0 5 METER RANGE PC BOARD 044-623 TOP BOTTOM Q241 Q239 Q237 Q229 TOP BOTTOM Q235 Q233 Q2

15、31 Q227 TOP BOTTOM Q236 Q234 Q232 Q228 LOCATION OF TRANSISTORS NOT ON PC BOARD Q242 Q240 Q238 Q230 TOP BOTTOM METER RANGE PC BOARD 044-623 SWITCH IS SHOWN FRONT VIEW IN WATTS POSITION METER R A N G E MC2205 MC2205 LAMP PC BOARD 044-792 LAMP PC BOARD 044-792 MC2205 LAMP MC2205 METER PC BOARD 044-624

16、METER MC2205 POWER SUPPLY POWER SUPPLY PC BOARD 044-631 MC2205 MC2205 LEFT CHANNEL POWER OUTPUT PC BOARD 044-626 POWER OUTPUT MC2205 POWER OUTPUT MC2205 RIGHT CHANNEL POWER OUTPUT PC BOARD 044-626 MC2205 A l l parts able f r om REPLACEMENT PARTS not listed are common i tems radio parts jobbers. Rep

17、l a cement pa rts may be obta i ned when obta i n- ordered by PART NUMBER from: Symbol Number C1O1 , 102 C109, 1 10 C1 13, 114 Cl 15 Cl 18 C201 ,202 C203,204 C207,208 C213,214 C215,216 C219,220 C227,228 C229,230 C231 ,232 C233,234 C235,236 C239,240 C301 C305,306 C307,308 C309 C310,31 1 D101 , 102 D

18、103, 104 D 105, 106 D 107, 108 D 109, 1 10 D 1 1 1 , 1 1 2 D113,1 14 Dl 15, 1 16 D117,1 18 D119 D120 Mclntosh Laboratory, Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3512) CAPACITORS Descr i pt i on Elect 10F 35V M y l a r 1 .5F 1 00V Elect 10F 50

19、V Elect 22F 35V Elect 47F 16V Elect 10F 50V Elect .47F 50V Elect 10F 35V Elect lOF 35V Elect .47F 50V Elect 220F 1 6V M y l a r .0047F 100V Poly .01F 2.5% 63V Mylar .068F 1 00V Poly .01F 2.5% 63V M y l a r .0047F 1 00V Elect 1F 63V Elect 10F 50V Elect 100F 16V Elect 2200F 1 6V M y l a r .22F 630V El

20、ect 39000F 50V D I O D E S Si. si gna l d i ode Si. si gna l d i ode S t . si gna l d iode Si. si gna l d i ode Si. si gna l d i ode Si. si gna l d i ode Si. si gna l d i ode Si. si gna l d iode Si. si gna l d i ode Zener diode S i . rect i f i er Part Number 066-173 064-143 066-221 066-214 066-182

21、066-221 066-244 066-173 066-173 066-244 066-218 064-132 064-142 064-136 064-142 064-132 066-248 066-221 066-226 066-247 064-052 066-225 070-047 070-047 070-047 070-047 070-047 070-047 070-047 070-047 070-047 070-085 070-031 D201 ,202 D203,204 D205.206 D207,208 D209,210 D21 1 ,212 0213,214 D215,216 D

22、217,218 D301 D302,303 D304,305 D306 D307 D308 F301 M101 , 102 Q101 , 102 Q103, 104 Q105 Q201 ,202 Q203,204 Q205,206 Q209,210 Q21 1 ,212 Q213,214 Q215,216 Q217,218 Q219.220 Q221 ,222 Q223,224 Q225,226 Q227,228 Q229,230 Q231 ,232 Q233,234 Q235,236 Q237,238 Q239,240 Si. si gna l d i ode Si. si gna l d

23、i ode Si. si gna l d i ode Si. si gna l d i ode S i . rect i f i er S i , rect i f i er S i . rect i f ier Si. si gna l d i ode Si. si gna l d i ode Si. si gna l d i ode Si. si gna l d i ode Zener d i ode 1 6V Zener d i ode 1 6V Rect i f i er br i dge S i . rect i f i er FUSES Fuse 10A METERS Meter

24、(power level ) TRANSISTORS S i . NPN trans i stor S i . PNP trans i stor S i . NPN trans i stor Si . NPN transistor S i . PNP trans istor Dual NPN trans i stor S i . PNP trans i stor S i . PNP trans istor S i . NPN trans-i stor S i . NPN trans i stor S i . PNP trans i stor S i . PNP trans i stor S i

25、 . NPN trans i stor S i . NPN trans i stor S i . PNP trans i stor S i . PNP trans i stor S i . N P N transistor Si . NPN transistor S i . NPN trans i stor S i . NPN trans i stor S i . PNP trans i stor S i . PNP trans i stor 070-047 070-047 070-047 070-047 070-031 070-031 070-031 070-047 070-047 070-

26、047 070-031 070-089 070-089 070-050 070-031 089-034 124-026 132-092 132-096 132-092 132-093 132-096 132-155 132-096 132-096 132-149 132-093 132-148 132-150 132-143 132-136 132-147 132-151 132-152 132-164 132-164 132-164 132-165 132-165 MC2205 Q241 ,242 Q301 Q302 Q303 Q304 Q305 Q306 Q307 Q308 IC101 ,

27、 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 st

28、or 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 P

29、OTENTIOMETERS 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 F i l m 909R 1% 1/4W F i l m 82. 5R 1% 1/4W Fi 1m 82.5R 1% 1/4W F i l m 909R 1% 1 /4W Thermistor W i rewound . 1 5R 5W W i rewound . 1

30、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 F i l m 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 1

31、33-037 134-294 134-293 134-298 134-273 144-049 144-050 144-048 144-075 144-071 144-073 144-072 144-072 144-073 144-074 139-105 139-105 139-105 139-105 139-105 139-105 144-074 144-077 144-076 144-012 144-076 139-076 S101 S201 S301 S302,303 K301 T201 ,202 T301 SWITCHES Meter range swi tch Power on-off

32、 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 & l i m i t #7381 Hold, dB & watts PANLOC SYSTEM Shelf bracket (right)

33、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 MC2205 038-980BE07200315C1105S7-M6980-3