McIntosh MC 22O5 Operating and installation instructions

MC22O5
SERVICEINFORMATION
MclNTOSH LABORATORY INC. BINGHAMTON, NEW YORK 13903
POWERAMPLIFIER
STARTINGWITHSERIALNO.AX1001
038-980

MC2205
PERFORMANCELIMITS& RATINGS
PERFORMANCE
McIntoshaudiopowerrati ngsareinac-
cordancewiththeFederalTradeCommis-
sionRegulationofNovember4,1974con-
cerningpoweroutputclaimsforampli-
fiersusedinhomeentertainmentpro-
ducts.
POWEROUTPUT
STEREO:200wattsminimum
sinewavecontinuousaver-
agepoweroutput,perchan-
nel,bothchannel'soperating
into1 ohm,2 ohms,4 ohms,
or8 ohmsloadimpedance,
whichi s:
14.1voltsRMSacross1 ohm
20.0voltsRMSacross2 ohms
28.3voltsRMSacross4 ohms
40.0voltsRMSacross8 ohms
MONO:400wattsminimumsine
wavecontinuousaveragepower
outputinto0.5ohm,1 ohm,
2ohms,or4 ohmsloadimped-
ance,whichis:
14.1voltsRMSacross0.5ohm
20.0voltsRMSacross1 ohm
28.3voltsRMSacross2 ohms
40.0voltsRMSacross4 ohms
OUTPUTLOADIMPEDANCE
STEREO:1 ohm,2 ohms,4 ohms,
and8 ohms;separateterminals
areprovidedforeachoutput
MONO:0.5ohm,1 ohm,2 ohms,
and4 ohms;obtainedbycon-
nectingtogethertheappro-
priateterminalsofbothchan-
nels
RATEDPOWERBAND
20Hzto20,000Hz
TOTALHARMONICDISTORTION
STEREO:0.1%maximumharmon-
icdistortionatanypower
levelfrom250milliwattsto
200wattsperchannelfrom
20Hzto20,000Hz,both
channelsoperating
MONO:0.1%maximumharmonic
distortionatanypowerlev-
elfrom250milliwattsto
400wattsfrom20Hzto
20,000Hz
STEREO:0.1%maximumifinstantaneous
peakpoweroutputis400wattsorless
perchannelwithbothchannelsopera-
tingforanycombi nationoffrequen-
cies, 20Hzto 20,000 Hz
MONO:0.1%maximumifinstantaneous
peakpoweroutputis800wattsorless
foranycombinationoffrequencies,
20Hzto20,000Hz
FREQUENCYRESPONSE
(atonewattoutput)
20Hzto20,000Hz,+0-0.25dB
10Hzto100,000Hz+0-3.0dB
NOISEANDHUM
95dBbelowratedoutput
RATINGS
OUTPUTVOLTAGES
25voltsfordistributionlines
DAMPINGFACTOR
STEREO:16atI ohmoutput,50at2
ohms output,30at4 ohmsoutput,
16at8 ohms output
MONO:16at0.5ohms,50at1 ohm,
30at2 ohms,and16at4 ohms
output
INPUTIMPEDANCE
100,000ohms
INPUTSENSITIVITY
Switchable:0.75voltor2.5volts-
Levelcontrolprovidedforhigher
inputvoltages
POWERREQUIREMENTS
120volts50/60HZ,70to550watts.
INTERMODULATIONDISTORTION

MC2205
LEFTINPUT
AC
LINE
BLOCKDIAGRAM
RIGHT/MONO
INPUT
LEFT
SPEAKER
OUTPUT
RIGHT
SPEAKER
OUTPUT

INTERCONNECTION
RIGHT/MONO
INPUT
LEFTINPUT
LEFT
CHANNEL
OUTPUT
HEADPHONE

1. Unlessotherwise spec ified: Resistancevalues arein ohms, 1/4 watt, and10%to 1erance;
capacitancevaluessmallrthan1 a reinmicrofarads(µF): capacitancevaluesgreater
than1 areinpicofarads(pF);inductorsareinmicrohenries(µH).
2. Printedcircuitboardcomponentsa reout1inedontheschematicsbydottedlines.The
ci rclednumbersonthedottedlinescorrespondtothenumbersonthePCboardlayouts.
3.Theheavylinesontheschematicsdenotetheprimarysignalpath.
4.Theterminalnumberingofrotaryswitchesisforreferenceonly.
5.Allvoltagesi ndi catedontheschemati csa remeasuredunderthefo11owingcondi t i ons;
a.Useofan11megohmimpedanceVTVM.
b.Allvoltages± 10%withrespecttochassisground.
c.Nosignalatinputterminals.
d.AC input at120 volts AC, 50/60Hz.
e.Frontpanel cont rolsat:Rearpanelswitchesa t:
LeftGainFULLYCCWInputLevel0.75V
MeterRangeWATTSModeS tereo
Right/MonoGainFULLYCCWPower GuardNormal
SpeakersON
PowerON
6.RelayK301showninenergizedposi t i on.
7.Meteradjustments:
Amplifier must be workingproperly to adjustmeters. Ope rate amplifier at full power (40V rms)
into8 ohmloadswith1 KHzinputsignal.
a.SetMETERRANGEswitchtoWATTS.
b.Adjust potent i ometerR125onmeterboardfora readingof200wattsontheleftmeter.
c.AdjustR126fora readingof200wattsontherightmeter.
d.SetMETERRANGEswitchto0 dB
e.AdjustpotentiometerR105onmeterboardfora readingof0 ontheDECIBELscaleofthe
leftmeter.
f.AdjustRI06fora readingof0 ontherightmeter.
8.Poweramplifierbiasadjustment:
Operate MC 2205 at120 volts line input with no input signal. Measure the input power
(approximately50watts)orcurrent(approximatelyO.4amps).ThebiaspotentiometersR241&
R242arelocatedonthepoweroutputPCboards.
a.Turnbothbiaspotentiometersf u l l ccw
b. Rotate bias adjus tment cwtothe point where the line input power or current begins to
i ncrease then back off slightly tothe point where the line input reaches itsl owest
value.
c. Repeatstepb foreachchannelindependently.
SCHEMATICNOTES
MC2205

MC2205
METER RANGE PC BOARD 044-623
TOP
BOTTOM
Q241
Q239
Q237
Q229
TOP
BOTTOM
Q235
Q233
Q231
Q227
TOP
BOTTOM
Q236
Q234
Q232
Q228
LOCATIONOFTRANSISTORSNOTONPCBOARD
Q242
Q240
Q238
Q230
TOP
BOTTOM

METERRANGE PC BOARD 044-623
SWITCHISSHOWNFRONTVIEW
INWATTSPOSITION
METERRANGE
MC2205

MC2205
LAMP PC BOARD 044-792

LAMP PC BOARD 044-792
MC2205
LAMP

MC2205
METER PC BOARD 044-624

METER

MC2205
POWERSUPPLY

POWERSUPPLYPCBOARD044-631
MC2205

MC2205
LEFT CHANNEL POWER OUTPUT PC BOARD 044-626

POWEROUTPUT

MC2205
POWEROUTPUT

MC2205
RIGHTCHANNEL POWER OUTPUT PC BOARD 044-626

MC2205
Allparts
ablefrom
REPLACEMENTPARTS
not listed are common i tems
radiopartsjobbers.
Repl acementpartsmaybeobtai nedwhen
obtai n-
ordered
byPARTNUMBERfrom:
Symbol
Number
C1O1 , 102
C109, 1 10
C113,114
Cl15
Cl18
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
C310,311
D101 , 102
D 103, 104
D 105, 106
D 107, 108
D 109, 1 10
D111,112
D113,114
Dl15,1 16
D117,118
D119
D120
MclntoshLaboratory,Inc.
CustomerServiceDepartment
2ChambersStreet
Binghamton,NewYork13903
(telephone[phone])
CAPACITORS
Descri pti on
Elect10µF35V
Mylar1 .5µF1 00V
Elect10µF50V
Elect22µF35V
Elect47µF16V
Elect10µF50V
Elect.47µF50V
Elect10µF35V
ElectlO^F35V
Elect.47µF50V
Elect220µF1 6V
Mylar.0047µF100V
Poly.01µF2.5%63V
Mylar.068µF1 00V
Poly.01µF2.5%63V
Mylar.0047µF1 00V
Elect1µF63V
Elect10µF50V
Elect100µF16V
Elect2200µF1 6V
Mylar.22µF630V
Elect39000µF50V
DIODES
Si.signal d i ode
Si.signal d i ode
St.signal d iode
Si.signal d i ode
Si.signal d i ode
Si.signal d i ode
Si.signal d i ode
Si.signal d iode
Si.signal d i ode
Zenerdiode
Si . recti f ier
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
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
D211 ,212
0213,214
D215,216
D217,218
D301
D302,303
D304,305
D306
D307
D308
F301
M101 , 102
Q101 , 102
Q103, 104
Q105
Q201,202
Q203,204
Q205,206
Q209,210
Q211 ,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.signal d i ode
Si.signal d i ode
Si.signal d i ode
Si.signal d i ode
Si . rectifier
Si , recti f ier
Si . recti fier
Si.signal d i ode
Si.signal d i ode
Si.signal d i ode
Si.signal d i ode
Zenerd i ode1 6V
Zenerd i ode1 6V
Recti f i erbri dge
Si . recti fier
FUSES
Fuse10A
METERS
Meter(powerlevel)
TRANSISTORS
Si. NPNtransistor
Si. PNPtransistor
Si. NPNtransistor
Si. NPNtransistor
Si . PNPtransistor
Dual NPN trans i stor
Si. PNPtransistor
Si . PNPtransistor
Si . NPNtrans-istor
Si. NPNtransistor
Si . PNPtransistor
Si . PNPtransistor
Si. NPNtransistor
Si. NPNtransistor
Si. PNPtransistor
Si. PNPtransistor
Si. NPNtransistor
Si. NPNtransistor
Si. NPNtransistor
Si. NPNtransistor
Si . PNPtransistor
Si. PNPtransistor
070-047
070-047
070-047
070-047
070-031
070-031
070-031
070-047
070-047
070-047
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 , 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
Si , PNPtransi stor
Si . NPNtransi stor
Si . NPNtransi stor
Powert ransi stor
Si . PNPtransi stor
Si . NPNtransi stor
Si . NPNtransi stor
Si. NPNtransistor
Si . NPNtransi stor
INTEGRATEDCIRCUITS
Integratedci rcui t
Integratedci rcui t
Integratedci rcuit
Integratedci rcui t
POTENTIOMETERS
dBAdjust
LogAdjust
BiasAdjust
Gai n controls
RESISTORS
Fi1m2.49K2%1 /4W
Film 649R 2% 1/4W
Fi1m274R2%1 /4W
Thermistor
Fi1m365n1%1/4W
Film 909R 1% 1/4W
Film82.5R1%1/4W
Fi1m82.5R1%1/4W
Film 909R 1%1 /4W
Thermistor
Wi rewound. 1 5R5W
Wi rewound. 1 5R5W
Wi rewound. 1 5R5W
Wi rewound. 1 5R5W
Wi rewound. 1 5R5W
Wi rewound. 1 5R5W
Thermi stor
Fi1m61.9K2% 1/4W
Film38.3K2%1/4W
Thermis tor
Film38.3K2%1 /4W
Wirewound220R2W
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
Meterrangeswitch
Poweron-offswitch
Speakerswitch
Thermalcutout
RELAY
Speakercontrol
TRANSFORMERS
Outputtransformer
Powertransformer
FRONTPANEL& TRIM
Frontpanel
Frontpanel endcaps
Knobs(all controls)
LAMPS
#1866Panel& meters
#7382 Normal & limit
#7381Hold,dB& watts
PANLOCSYSTEM
Shelfbracket(right)
Shelfbracket( left)
Mountingtemplate#300
Hardwarepackage
MISCELLANEOUSITEMS
Plasticfeet
Shi ppi ngcarton
Ownersmanual
Linecord
Fuseholder,
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
038-980 BE072003
15C1105S7-M6980-3