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MC 22O5
POWER AMPLIFIER

SERVICE
STARTING

INFORMATION
SERIAL NO. AX1001

WITH

MclNTOSH

LABORATORY

INC.

BINGHAMTON, NEW

YORK

13903
038-980

MC2205

P E R F O R M A N C E LIMITS & R A T I N G S

PERFORMANCE
Mc Intosh audio power rat i ngs are in accordance w i t h the Federal Trade Commission Regulation of November 4, 1974 concerning power output c l a i m s for a m p l i fiers used in home entertainment products.

MONO: 0.1% maximum harmonic d i s t o r t i o n at any power level from 250 m i l l i w a t t s to 400 watts from 20 Hz to 20,000 Hz INTERMODULATION DISTORTION

POWER OUTPUT STEREO: 200 watts m i n i m u m s i n e wave continuous average power output, per chann e l , both channel's operating into 1 ohm, 2 ohms, 4 ohms, or 8 ohms load impedance, which i s: 14.1 v o l t s 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 m i n i m u m sine wave continuous average power output into 0.5 ohm, 1 ohm, 2 ohms, or 4 ohms load impedance, 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 t e r m i n a l s are provided for each output MONO: 0.5 ohm, 1 ohm, 2 ohms, and 4 ohms; obtained by connecting together the approp r i a t e t e r m i n a l s of both channel s RATED POWER BAND 20 Hz to 20,000 Hz TOTAL H A R M O N I C D I S T O R T I O N STEREO: 0.1% maximum harmonic d i s t o r t i o n 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 operat ing

STEREO: 0.1% maximum if instantaneous peak power output is 400 watts or less per channel w i t h both channels operating for any comb i nat ion of frequencies, 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 d i s t r i b u t i o n 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 S E N S I T I V I T Y
Switchable: 0.75 v o l t or 2.5 voltsLevel control provided for higher input voltages

POWER R E Q U I R E M E N T S
120 volts 50/60HZ, 70 to 550 watts.

MC2205

LEFT INPUT

LEFT SPEAKER OUTPUT

AC LINE

RIGHT SPEAKER OUTPUT

RIGHT/MONO INPUT

BLOCK DIAGRAM

LEFT CHANNEL OUTPUT

HEADPHONE

LEFT INPUT

RIGHT/MONO INPUT

INTERCONNECTION

MC2205 SCHEMATIC NOTES
1. Unless otherwise spec i f i e d : Resistance v a l u e s are in ohms, 1/4 w a t t , and 10% to 1erance; capacitance v a l u e s sma llr than 1 a re in microfarads (µF) : capacitance v a l u e s greater than 1 are in picofarads (pF); inductors are in m i c r o h e n r i e s (µH). P r i n t e d c i r c u i t board components a re ou t1i ned on the schema t i c s by dotted l i n e s . The c i rcled numbers on the dotted l i n e s correspond to the numbers on the PC board l a y o u t s . The heavy li nes on the schema t i c s denote the pr ima ry s i g n a l p a t h . The t e r m i n a l number i n g of rotary switches is for reference o n l y . A l l voltages i nd i cated on the schemat i cs a re measu red under the f o 1 1 o w i ng cond i t i ons; a. b. c. d. e. Use of an 11 megohm impedance VTVM. A l l v o l t a g e s ± 10% w i t h respect to chassis ground. No s i g n a l at i n p u t t e r m i n a l s . AC i n p u t at 120 volts AC, 50/60Hz. Front pane l con t rols at: Left Gain Meter Range Right/Mono Gain Speakers Power 6. 7. FULLY CCW WATTS FULLY CCW ON ON Rear p a n e l swi tches a t: Input Level Mode Power Guard 0.75V S tereo Normal

2. 3. 4. 5.

R e l a y K301 shown in energized pos i t i on. Meter adjustments: A m p l i f i e r must be working p r o p e r l y to adjust meters. i n t o 8 ohm loads w i t h 1 KHz i n p u t s i g n a l . a. b. c. d. e. f. Set M E T E R R A N G E s w i t c h to WATTS. Adj us t pot en t i ometer R 1 2 5 on meter board for a r e a d i n g of 200 w a t t s on the l e f t meter. A d j u s t R 1 2 6 for a r e a d i n g of 200 watts on the r i g h t meter. Set METER RANGE switch to 0 dB Adjust p o t e n t i ometer R 1 0 5 on meter board for a r e a d i n g of 0 on the D E C I B E L scale of the l e f t meter. Adjust RI06 for a r e a d i n g of 0 on the r i g h t meter. Ope rate a m p l i f i e r at f u l l power (40V rms)

8.

Power a m p l i f i e r b i a s adjustment: Operate MC 2205 at 120 v o l t s l i n e i n p u t w i t h no i n p u t s i g n a l . ( a p p r o x i m a t e l y 50 watts) or current (approximately O.4 amps). R242 are located on the power output PC boards. Measure the i n p u t power The b i a s potentiometers R241 &

a. b.

Turn both b i a s potentiometers f u l l ccw Rotate b i a s ad jus tment cw to the p o i n t where the l i n e i n p u t power or current b e g i n s to i ncrease then back off s l i g h t l y to the p o i n t where the l i n e in put reaches its l owest va l ue . Repeat step b for each channel i n d e p e n d e n t l y .

c.

MC2205

METER RANGE PC BOARD 044-623

Q242 Q240 Q238 Q230

TOP

BOTTOM

Q241 Q239 Q237 Q229

TOP

BOTTOM

Q236 TOP Q234 Q232 Q228 BOTTOM

Q235 TOP Q233 Q231 Q227 BOTTOM

LOCATION OF TRANSISTORS NOT ON PC BOARD

MC2205

METER RANGE PC BOARD 044-623
SWITCH IS SHOWN FRONT VIEW IN WATTS POSITION

METER RANGE

MC2205

LAMP PC BOARD 0 4 4 - 7 9 2

MC2205

LAMP

PC BOARD

044-792

LAMP

MC2205

METER PC BOARD 044-624

METER

MC2205

POWER

SUPPLY

MC2205

POWER SUPPLY PC BOARD 044-631

MC2205

LEFT CHANNEL POWER OUTPUT PC BOARD 0 4 4 - 6 2 6

POWER OUTPUT

MC2205

POWER OUTPUT

MC2205

RIGHT CHANNEL POWER OUTPUT PC BOARD 044-626

MC2205 R E P L A C E M E N T PARTS
A l l p a r t s not l i s t e d are common i tems obta i na b l e f r om r a d i o p a r t s j o b b e r s . R e p l a cement pa r t s m a y be obta i ned when o r d e r e d by PART NUMBER f r o m : M c l n t o s h Laboratory, Inc. Customer Service Department 2 C h a m b e r s Street B i n g h a m t o n , New Y o r k 13903 (telephone 607-723-3512) CAPACITORS Symbol Number D e s c r i pt i on Elect Mylar Elect Elect Elect Elect Elect Elect Elect Elect Elect Mylar Poly Mylar Poly Mylar Elect Elect Elect Elect Mylar Elect 1 10µF .5µF 10µF 22µF 47µF 10µF .47µF 10µF lO^F .47µF 220µF .0047µF .01µF .068µF .01µF 2.5% .0047µF 1µF 10µF 100µF 2200µF .22µF 39000µF DIODES 35V 1 00V 50V 35V 16V 50V 50V 35V 35V 50V 1 6V 100V 1 00V 63V 1 00V 63V 50V 16V 1 6V 630V 50V 2 . 5 % 63V Part Number 066-173 064-143 066-221 066-214 066-182 066-221 066-244 066-173 066-173 066-244 066-218 064-132 064-142 064-136 064-142 064-132 066-248 066-221 066-226 066-247 064-052 066-225

D201 ,202
D203,204 D205.206 D207,208 D209,210

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
S i . rect i f i er S i , rect i f i er S i . rect i f i e r

070-047 070-047 070-047 070-047 070-031 070-031 070-031 070-047 070-047 070-047 070-031 1 6V 1 6V 070-089 070-089 070-050 070-031

D21 1 , 2 1 2
0213,214 D215,216 D217,218

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
Z e n e r d i ode Zener d i ode Rect i f i er br i dge S i . rect i f i er FUSES

C1O1 , 102 C 1 0 9 , 1 10
C1 13, 114

D301
D302,303 D304,305 D306 D307 D308

Cl 15 Cl 18

C201 ,202
C203,204 C207,208 C213,214 C215,216 C219,220 C227,228 C229,230

F301

Fuse

10A METERS

089-034

M101 , 102

Meter (power l e v e l ) TRANSISTORS

124-026

Q101 , 102 Q103, 104 Q105 Q201 ,202
Q203,204 Q205,206 Q209,210

S i . N P N t r a n s i stor S i . P N P trans i stor S i . N P N trans istor Si. N P N transistor S i . PNP transistor D u a l NPN t r a n s i stor S i . P N P t r a n s i stor S i . P N P trans istor S i . N P N t r a n s - i stor S i . N P N trans i stor S i . P N P t r a n s i stor S i . P N P t r a n s i stor S i . N P N trans i stor S i . N P N t r a n s i stor S i . P N P t r a n s i stor S i . P N P t r a n s i stor Si. N P N transistor Si . NPN t r a n s i s t o r S i . N P N t r a n s i stor S i . N P N t r a n s i stor S i . P N P t r a n s i stor S i . P N P t r a n s i stor

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

C231 ,232
C233,234 C235,236 C239,240

C301
C305,306 C307,308 C309 C310,31 1

Q21 1 , 2 1 2
Q213,214 Q215,216 Q217,218 Q219.220

D101 , 102
D 103, 104 D 105, 106 D 1 0 7 , 108 D 109, 1 10
D111,112 D 1 1 3 , 1 14

Si. si gna l d i ode Si. si gna l d i ode
S t . s i gna l d iode

070-047 070-047 070-047 070-047 070-047 070-047 070-047 070-047 070-047 070-085 070-031

Q221 ,222
Q223,224 Q225,226 Q227,228 Q229,230

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
S i . si gna l d iode

Q231 ,232
Q233,234 Q235,236 Q237,238 Q239,240

Dl 15, 1 16
D 1 1 7 , 1 18

Si. si gna l d i ode
Zener d i o d e S i . rect i f i er

D119 D120

MC2205
Q241 ,242 Q301
Q302 Q303 Q304 Q305 Q306 Q307 Q308 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 C I R C U I T S 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 132-165 132-090 132-078 132-079 132-096 132-090 132-143 132-090 132-143 SWITCHES

S101 S201 S301
S302,303

Meter range swi tch Power on-off swi tch Speaker sw i tch Thermal cutout RELAY Speaker control TRANSFORMERS

146-180 146-167 146-167 153-017

K301

087-017

T201 ,202
133-037 133-037 133-037 133-037

Output transformer Power transformer FRONT PANEL & T R I M Front panel Front pane l end caps Knobs (al l control s)

044-636 044-637

IC101 , 102
IC 103, 104
IC105,106 IC201 ,202

T301

044-634 018-173 090-156

R105, 106 R 1 2 5 , 126 R241 ,242

dB Adjust Log Adjust B i a s Adjust

134-294 134-293 134-298 134-273

LAMPS #1866 Panel & meters #7382 Normal & l i m i t #7381 Hold, dB & watts PANLOC SYSTEM 058-014 058-061 058-062

R201-1,202-1 Ga i n control s RESISTORS R135,136 R137,138 Fi 1m 2.49K Film Fi 1m 649R 274R 2% 2% 2% 1% 1% 1% 1% 1% 1 /4W 1/4W 1 /4W 1/4W 1/4W 1/4W 1/4W 1 /4W

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

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 ,

043-678 043-679 038-244 044-871

R 139, 140
R141 , 142
R229,230 R249,250

Thermi s tor Fi 1m 365n Film Film Fi 1m Film 909R 82.5R 909R

R251 ,252
R255,256 R257,258 R279,280

82. 5R

017-218 045-008 038-950 170-021 178-001

Thermistor W i rewound W i rewound W i rewound W i rewound W i rewound Therm i stor . 1 5R 5W . 1 5R 5W . 1 5R 5W . 1 5R 5W . 1 5R 5W

R281 ,282
R283,284 R285,286 R287,288 R289,290

W i rewound . 1 5R 5W

R291 ,292
R295,296 R297,298 R299 R323 R200-1

Fi 1m 61 .9K
Film 38. 3K Thermi s tor

2%
2% 2% 220R

1/4W
1/4W 1 /4W 2W

F i l m 38. 3K R203-1,204-1 Wirewound

MC2205

038-980

BE072003

15C1105S7-M6980-3