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

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

LINE

BLOCKDIAGRAM

RIGHT/MONO

INPUT

LEFT

SPEAKER

OUTPUT

RIGHT

SPEAKER

OUTPUT

INTERCONNECTION

RIGHT/MONO

INPUT

LEFTINPUT

LEFT

CHANNEL

OUTPUT

HEADPHONE

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

workingproperly

adjustmeters.

Ope

rate

amplifier

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

2205

at120

volts

line

input

with

input

signal.

Measure

the

input

power

(approximately50watts)orcurrent(approximatelyO.4amps).ThebiaspotentiometersR241&

R242arelocatedonthepoweroutputPCboards.

a.Turnbothbiaspotentiometersf u l l ccw

Rotate

bias

adjus

tment

cwtothe

point

where

the

line

input

power

current

begins

ncrease

then

back

off

slightly

tothe

point

where

the

line

input

reaches

itsl

owest

value.

c. Repeatstepb foreachchannelindependently.

SCHEMATICNOTES

MC2205

METER

RANGE

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

BOARD

044-623

SWITCHISSHOWNFRONTVIEW

INWATTSPOSITION

METERRANGE

MC2205

LAMP

BOARD

044-792

LAMP

BOARD

044-792

MC2205

LAMP

MC2205

METER

BOARD

044-624

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