McIntosh MC 250 Operating and installation instructions

MC 250

SERVICEINFORMATION

STARTING

WITH

SERIAL

NO.

23L48

MCINTOSHLABORATORYINC.2 CHAMBERSSTREETBINGHAMTON,NEWYORK

MC250

ELECTRICALSPECIFICATIONS

PowerOutput:

100wattsRMScontinuous,50wattsperchanneloperating

simultaneously,into4 ohm,8 ohm,or16ohmloads.

HarmonicDistortion:

Lessthan0.25%atratedpoweroutputfrom20Hzto20,000Hz.

IntermodulationDistortion:

Lessthan0.25%foranycombinationoffrequenciesbetween

20Hzand20,000Hz.

FrequencyRange:

Atratedoutputbothchannels:+0to-0.25dBfrom20Hz

through20,000Hz.

OutputDampingFactor:

Greaterthan10foranyoutputtap.

InputSensitivity& Impedance:

Inputsensitivityis0.5volts.InputimpedanceIs200Kohms.

Hum& Noise:

Greaterthan90dBbelowratedoutput.

PowerRequirements:

117voltsAC,50-60Hz,50wattsatzerosignaloutput,250

wattsatratedoutput.

MC250

LEFT

CHANNEL

POWER

OUTPUTPRINTEDCIRCUITBOARD

043-916

RIGHTCHANNEL

POWER

OUTPUTPRINTEDCIRCUITBOARD

043-916

INPUT

SECTION

PRINTED

CIRCUIT

BOARD

043-795

MC250

SCHEMATICNOTES

MC250

1.Unlessotherwisespecified:Resistancevaluesareinohms,1/2watt,and

10%tolerance;capacitancevaluessmallerthan1 areinmicrofarads(µF);

capacitancevaluesgreaterthan1 areinpicofarads(pF);inductorsarein

mic rohenr i es(µH).

2.Printedcircuitboardcomponentsareoutlinedontheschematicsbydotted

lines.Thecirclednumbersonthedottedlinescorrespondtothenumbers

onthePCBoardlayouts.

3.Theheavylinesontheschematicsdenotetheprimarysignalpath.

4.Allvoltagesindicatedontheschematicsaremeasuredunderthefollowing

conditions:

a.Useofan11megohmimpedanceVTVM.

b.Allvoltages±10%withrespecttochassisground.

c.Nosignalatinputterminals.

d.ACinputat117volts,50/60Hz.

e.Frontpanelcontrolsat:

LeftGain

RightGain

Mode

FullyCCW

Fully

CCW

Stereo

5.InunitswithSerialNo.'sbelow28L21:R88,R89,R90& R91areused;

R49& R50are2200W;R86& R87are160W;andR33& R34are33k.

6.InunitswithSerialNo.'sfrom28L60to37L75,C5& C6are180pF.

Q21 Q25

BOTTOMTOP

Q19 Q23

BOTTOMTOP

Q20

BOTTOM

LOCATIONOFTRANSISTORSNOTONPRINTEDCIRCUITBOARDS

Q26

TOP

Q22

BOTTOM

Q24

TOP

MC250

REPLACEMENTPARTS

Allpartsnotlistedarecommonitems

ablefromradiopartsjobbers.

Rep1acementpartsmaybeobtainedwhen

byPARTNUMBERfrom:

MclntoshLaboratoryInc.

CustomerServiceDepartment

2ChambersStreet

Binghamton,NewYork13903

(telephone607723-3512)

Symbol

Number

Cl1, 12

C27,28

C29

C47,48

C51,52

C53,54

C55,56

C57

D1,2

D5,6

07,8

D13,14

D15,16

D18

D20

D25,26

D27,28

D31,32

Q1,2

Q3,4

Q5,6

Q7,8

Q9.10

Q11,12

Q15,16

Q17,18

Q19,20

Q21,22

Elect.

Mylar

Elect.

si.

Si.

2.5A

Si.

si.

Si.

CAPACITORS

Description

470µF4V

9300µF45V

80/80/150/50µF

200/200/150/150V

.47µF

100µF 15V

10µF

25V

640µF25V

500µF50V

DIODES

referencediode

rectifierdiode

FUSES

circuitbreaker

TRANSISTORS

NPNtransistor

PNPtransistor

NPNtransistor

PNPtransistor

NPNtransistor

PNPtransistor

obtain-

ordered

Part

Number

066-136

066-106

066-095

064-045

066-127

066-005

066-157

066-137

070-046

070-022

070-O4

070-041

070-031

070-022

088-001

132-054

132-056

132-515

132-021

132-032

132-524

132-530

Q23,24

Q25,26

R43,44

R57,58

R59,60

S1,2

Si.NPNtransistor132-070

POTENTIOMETERS

Leftgain134-206

Right/monogain134-206

RESISTORS

Wirewound3.6k5W139-065

Wirewound.56W5W139-048

Wirewound.33W5W139-071

SWITCHES

Thermalcutout153-007

Modeselector153-008

TRANSFORMERS

Powertransformer043-605

Output

transformer

(right)

043-667

Outputtransformer(left)043-668

MISCELLANEOUSITEMS

Plasticfeet017-040

Ownersmanual038-287

Gaincontrolknob090-017

Shipping

carton

033-077

ACpowercord170-021

15C01047S-M1508

SCHEMATIC

PART

NO.

038-508

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