McIntosh MC 22O5 Bedienungs- und Montageanleitung
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
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