McIntosh MA 5100 Operating and installation instructions

MA 5100
PREAMP- AMPLIFIER
SERVICEINFORMATION
STARTING WITH SERIAL NO. 21HOO
MclNTOSHLABORATORYINC.2 CHAMBERSSTREETBINGHAMTON,NEWYORK
MA5100

MA 5100ELECTRICALSPECIFICATIONS
PowerOutput:
90wattsRMScontinuous,45wattsperchanneloperatingsimultaneouslyinto
4ohmor8 ohmloads.
60wattsRMScontinuous,30wattsperchanneloperatingsimultaneouslyinto
16ohmloads.
HarmonicDistortion:
Lessthan0.25%atratedpoweroutputfrom20Hzto20,000Hzwithbothchan-
nelsoperating.
IntermodulationDistortion:
Lessthan0.25%foranycombinationoffrequenciesfrom2QHzto20,000Hz
ifinstantaneouspeakpoweris90wattsperchannelorlessinto4 or8 ohm
loadsand60wattsperchannelorlessinto16ohmloadswithbothchannels
operating.
FrequencyRange:
Atratedoutputbothchannels:±0.5dB20Hzthrough20,000Hz.
OutputImpedance:
4ohm,8 ohm,16ohm.Noimpedanceswitchingrequired.
InternalImpedance/Damping:
Lessthan.04ohms;dampingfactorgreaterthan100.
InputSensitivityAndImpedance:
Auxiliary,Tape,Tuner,andTapeMonitor:300mV,250Kohms.
Phono1 andPhono2:2mV,47,000ohms.
TapeHead:2mV,1/2megohm.
HumAndNoise:
HighLevelInputs:75dBbelowratedoutput.
LowLevelInputs:70dBbelow10mVinput.
PowerAmplifier:90dBbelowratedoutput.
TapeOutput:
300mVatratedsensitivity,1.4voltswith10mVatphonoinput.
LeftPlusRightOutput:
Adjustable 0 to6 voltsfromgeneratorimpedance of lessthan 5,000 ohms.
BassControls:
+18dBat20Hz.
TrebleControls:
+l8dBat20,000Hz.
HFFilter:
Flat,or5,000Hzcutoff.
LPFilter:
Plat,or50Hzcutoff.
PowerRequirements;
117voltsAC,50-60Hz,70wattsatzerosignaloutput,200wattsatrated
output.

MA
5100
BLOCK
DIAGRAM
MA 5100

MA 5100
PREAMP.SECTIONPRINTEDCIRCUITBOARD
043-989

PREAMP.SECTION
MA5100154-411
HEAVY LINE SHOWS PRIMARY SIGNALPATH

POWEROUTPUT
SECTION
MA5100154-376
HEAVYLINESHOWSPRIMARYSIGNALPATH

MA 5100
OUTPUTMONITORPRINTEDCIRCUITBOARD 043-821
(NOTE1 )
LEFTCHANNELPOWEROUTPUTSECTIONPRINTEDCIRCUITBOARD043-919
RIGHTCHANNELPOWEROUTPUTSECTIONPRINTEDCIRCUITBOARD 043-919

FILTERSECTION
MA5100154-410
FILTERSECTIONPRINTEDCIRCUITBOARD
043-990
MA 5100FILTERSECTIONPRINTEDCIRCUITBOARD043-990

SCHEMATICNOTES
MA 5100
Unlessotherwisespecified:Resistancevaluesareinohms,1/2watt,and10%
tolerance; capacitance values smaller than 1 arein microfarads (mfd); capacitance
valuesgreaterthan1 areinpicofarads(pF); inductorsareinmicrohenries(µH).
Printed circuit board components are outlined onthe schematics by dotted lines.
The circled numbers onthe dotted lines correspond tothe numbers ofthePC board
layouts.
The heavy lines onthe schematicsdenote the primary signal path.
Theterminalnumberingofrotaryswitchesisforreferenceonly.
All voltages indicated onthe schematics are measured under the following condi-
tions:
a.Useofan11 megohm input impedance VTVM,
b.All voltages ±10% with respect to chassis ground.
c.Nosignalatinputterminals,
d.AC input at117 volts AC, 50/60Hz.
e.Frontpanelcontrolsat:
Input Selector
ModeSelector
AUX
STEREO
Volume
Power
MAX
ON
Allothercontrolsinnormalposition.
1.In units with serial numbersbelow 46H01, the output monitor PC board isnot
used.
2.In units with serial numbersbelow44H50: R256 & R25? arenot used; R254&
R255 are120 ohms; transistors Q205 & Q206 (132-021) and potsR221 & R222
(134-120) are used; the emitter of Q2l5 & Q216 is connected as shown bythe
dotted line; C221 & C222 are used.
3.In early units, C5& C6 were 39pF.
4.In units with serial numbersbelow30H15:L201,L202,R241, R242, C215,
C216,C217,andC2l8arenotused;C227,C228,C229,C230,C231,andC232
areused;R229& R230are100ohms;C201& C202are330pF.
5.In early units, C207 & C208 were 200µF, 3V (part number066-086).
6.In units with serial numbersbelow30H30:D201 & D202 were two diodes
(partnumber070-022).
7.In units with serial numbersbelow28H00: C3, C4} C5,C6,R9, R10, and
R314arenotused.
8.In early units, C308 & C309 were 10,000µF, 40V (part number066-090).
9.In units with serial numbersbelow24H05: R237 & R238 are.47 ohms; R233
& R234 are220 ohms; C211,C212,C213, and C2114 are .01µF.
10.In units with serial numbersbelow 23H7S: D211,D212,D213, and D214 are
notused.
11.In units with serial numbersbelow22H00: R227 & R228 were 1K, 10%, 1W,
12.In units with serial No'sbelow54H60: R254 and R255 are18and F201,
F202,F203j and F204 are3A fuses. (Part Ho. 089019)
LOCATIONOFTRANSISTORSNOTONPRINTEDCIRCUITBOARDS

POWER
SUPPLY
SECTION
MA
5100
154-331
MA 5100

REPLACEMENTPARTS
Allpartsnotlistedarecommonitemsobtain-
ablefromradiopartsjobbers.
Replacementpartsmaybeobtainedwhenordered
byPARTNUMBERfrom:
MclntoshLaboratory,Inc.
CustomerServiceDepartment
2ChambersStreet
Binghamton,NewYork13903
(telephone[phone])
Symbol
Number
C1,2
C7,8
C9,10
C11,12
C13, 14
C15, 16
C17, 18
C19,20
C21,22
C23,24
C101 , 102
C103, 104
C107, 108
C11 1
C112,113
C203,204
C207,208
C211 ,212
C213,214
C223,224
C304
C305
C306
C307
C308
C309
D201,202
D203,204
D205,206
D207,208
D209,210
D211 ,212
D213,214
CAPACITORS
Description
Mylar.22µF250V
Mylar.1µF250V
Elect.100µF12V
Mylar.1µF250V
Mylar.1µF250V
Mylar.47µF75V
Mylar.47µF250V
Elect. 100µF 12V
Mylar.47µF250V
Mylar.22µF200V
Mylar. 1 µF250V
Mylar.01µF250V
Mylar.22µF250V
Ta.Elect.1µF35V
Ta.Elect.1.5µF35V
Elect. 100µF 12V
Elect. 180µF 3V
Mylar.047µF250V
Mylar.047µF250V
Elect.10µF25V
Part
Number
064-043
064-037
066-127
064-037
064-037
064-039
064-045
066-127
064-045
064-087
064-038
064-040
064-043
066-091
066-092
066-127
066-111
064-044
064-044
066-005
Elect.80/80/150/50µF066-103
200/200/150/150V
Elect.200/500µF
100/50V
Elect.200/500µF
-100/-75V
Elect.100µF12V
Elect.9300µF45V
Elect.9300µF45V
DIODES
Si.referencediode
Si. rectifier
Si. rectifier
Si.signaldiode
Si.signaldiode
Si. rectifier
Si.rectifier
066-099
066-093
066-127
066-106
066-106
070-040
070-030
070-030
070-022
070-022
070-031
070-031
D301
D302
D303
D304
D305
D306
D307
D308
D309
F201,202
F203,204
F301
L201,202
Q1,2
Q3,4
Q5,6
Q7,8
Q9,10
Q11,12
Q101 , 102
Q103, 104
Q201,202
Q203,204
Q207,208
Q209,210
Q211 ,212
Q211 ,212
Q213,214
Q215,216
Q217,218
Q219,220
R53
R58
R63
R63
R64
R64
R247
Si. rectifier
Si. rectifier
Si. rectifier
Si. rectifier
Si. rectifier
Si. rectifier
Si. rectifier
Si. rectifier
Si.rectifier
FUSES
Fuse4A(SFE-4)
Fuse4A(SFE-4)
Fuse2.5ASlo-Blo
CHOKES
Choke2µH
TRANSISTORS
Si. NPN transistor
Si. NPN transistor
Si. NPN transistor
Si. NPN transistor
Si. NPN transistor
Si. NPN transistor
Si. NPN transistor
Si. PNP transistor
Si. PNP transistor
Si. PNP transistor
Si. NPN transistor
Si. PNP transistor
Si.NPNtransistor(for
unitsabove22H60)
Si.NPNtransistor(for
unitsbelow22H60)
Si. NPN transistor
Si. PNP transistor
Si. NPN transistor
Si.NPNtransistor
POTENTIOMETERS
Balancecontrol
VolumeControl
Basscontrol(w/flatshaft)
Bass control (w/knurled
shaft)
Treblecontrol(w/flat
shaft)
Treblecontrol(w/knurled
shaft)
L& R adjust
070-031
070-031
070-031
070-031
070-041
070-041
070-041
070-041
070-030
089-021
089-021
089-015
122-064
132-041
132-041
132-051
132-041
132-057
132-051
132-057
132-029
132-029
132-029
132-021
132-032
132-515
132-022
132-521
132-527
132-533
132-533
134-035
134-033
134-172
134-162
134-173
134-163
134-063
MA 5100

MA 5100 SCHEMATICPART NO. 038-376
BE042004
MA 5100
R231 ,232
R237,238
R239,240
R250,251
R301
R302,303
R307
R308
R311
R312
R313
S1
S2
S3
S4
S5
S101
S102
S103
S201
S301
S302
S303
T301
TR201,202
SB201,202
RESISTORS
Wirewound3.6k5W
Wirewound.33ohms5W
Wirewound.47ohms5W
Wirewound200ohms5W
Wirewound100ohms5W
Wirewound220ohms5W
Wirewound100ohms5W
Wirewound220ohms5W
Wirewound7.5ohms5W
Wirewound500ohms5W
Wirewound220Ohms5W
SWITCHES
Inputselectorswitch
Compensationswitch
Tapemonitorswitch
Modeselectorswitch
Loudnessswitch
LF switch
HFswitch
Phaseswitch
Speakerswitch
Powerswitch
Thermalcutout
Thermalcutout
TRANSFORMERS
Powertransformer
THYRISTORS& TRIGGERS
Triac
Bilateralswitch
MODULES
ToneControlmodule
Compensationmodule
FRONTPANEL& TRIM
Frontpanel
Frontpanelendcap{right)
Frontpanelendcap(left)
Volumecontrolknob
Balancecontrolknob
Inputcontrolknob
Modeselectorknob
Trebleknob(rear)
Trebleknob(front)- for
flatshaft
139-013
139-036
139-050
139-009
139-008
139-009
139-008
139-009
139-010
139-011
139-009
146-035
148-019
148-012
146-105
148-019
148-019
148-019
148-019
148-012
148-005
153-007
153-007
043-551
131-001
131-002
130-007
130-026
043-725
018-043
018-044
043-253
043-253
043-253
043-253
090-009
043-625
Trebleknob(front)- for
knurledshaft
Bassknob(rear)
Bassknob(front)- for
flatshaft
Bassknob(front)- for
knurledshaft
LAMPS
Panel illumination #1864
Switch indicator #334
MOUNTINGSYSTEM
Shelfbracket{right)
Shelfbracket(left)
Mountingtemplate#100
Hardwarepackage
MISCELLANEOUSITEMS
Plasticfeet
Shippingcarton
Ownersmanual
Linecord
Shortingplug
Fuseholder
•
15C1114S6-M9376
090-008
090-009
043-625
090-008
058-028
058-003
043-234
043-235
038-179
043-557
017-041
043-727
038-129
170-021
127-001
178-001