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INTEGRATED AMPLIFIER
.
02
4 0
WA T TS
.
20 2.0
3 0 2 0
D E C IB EL S
20
10
P O W E R O U T P U T
20 0
40
0
0
B A S S T R E B L E
SE N S O R
C D 1 C D 2 T U N E R V ID E O
L E F T
P O W E R G U A R D
R IG H T
.
02
4 0
WA T TS
.
20 2.0
3 0 2 0
D E C I B EL S
20
10
P O W E R O U T P U T
20 0
40
0
0
L
B A L A N C E
R
V O L U M E
TA P E
H E A D P H O N E S
M O N O 1 S P E A K E R S 2 M U T E L O U D
CONTENTS
Performance Specifications ........................................ 2
Notes ......................................................................... 3
Rear Panel .................................................................. 4
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 8
Interconnection Diagram .................................... 9 - 10
Input Driver Schematic and PCB ....................... 11 - 18
Heatsink Schematic and PCB ............................ 19 - 20
Lamp Schematic and PCB ................................. 19 - 20
PG Display Schematic and PCB ........................ 21 - 22
Control Schematic and PCB .............................. 21 - 22
Tone Schematic and PCB .................................. 23 - 26
Parts List ............................................................ 25 - 28
Exploded View and Parts List ............................. 29 - 31
Repacking Instructions ............................................. 33
SERVICE MANUAL
PREFORMANCE SPECIFICATIONS
POWER OUTPUT, STEREO
250, 200, 120 watts minimum sine wave continuous average power output per channel, both channels operating, into a load impedance of 2, 4 and 8 ohms respectively.
TOTAL HARMONIC DISTORTION
0.005% maximum at any power level from 250 milliwatts to rated power per channel from 20Hz to 20,000Hz, both channels operating.
INTERMODULATION DISTORTION
0.005% maximum if instantaneous peak power output per channel does not exceed twice the rated output with both channels operating for any combination of frequencies from 20Hz to 20,000Hz.
OUTPUT LOAD IMPEDANCE
2, 4 or 8 ohms
RATED POWER BAND
20Hz to 20,000Hz
DYNAMIC HEADROOM
2.4dB at 2, 4 or 8 ohms
DAMPING FACTOR
60 at 2 ohms
120 at 4 ohms
230 at 8 ohms
FREQUENCY RESPONSE
+0, -0.5dB from 20Hz to 20,000Hz
SIGNAL TO NOISE RATIO, (A WEIGHTED)
Phono Input: 90dB (84dB IHF) below 10mV input
High Level: 100db (90dB IHF) below rated output
Power Amplifier: 110dB below rated output
SENSITIVITY
Phono: 2.5mV for 2.5V rated output (0.5mV IHF)
High Level: 250mV for 2.5V rated output (50mV IHF)
Power Amplifier Input: 2.5V for rated output
INPUT IMPEDANCE
Phono: 47k ohms, 65pF
High Level: 22k ohms
MAXIMUM INPUT SIGNAL
Phono: 90mV
High Level: 8V
POWER REQUIREMENT
120V, 50/60Hz, 5.0 Amps UL/CSA
230V, 50/60Hz, 2.5 Amps
PREAMPLIFIER MAXIMUM VOLTAGE OUTPUT
Phono: 90mV at tape output
High Level: 8V at tape output
Main Out: 8V at preamp output
VOLTAGE GAIN
High Level to Tape: 0dB
High Level to Main: 20dB
TONE CONTROLS
Bass Control: +/-12dB at 20Hz
Treble Control: +/-12dB at 10kHz
POWER REQUIREMENTS
100 Volts, 50/60Hz at 4.8 Amps
110 Volts, 50/60Hz at 4.4 Amps
120 Volts, 50/60Hz at 4.0 Amps
220 Volts, 50/60Hz at 2.0 Amps
230 Volts, 50/60Hz at 2.0 Amps
240 Volts, 50/60Hz at 2.0 Amps
NOTE: Refer to the rear panel of the MA6500 for the correct voltage.
DIMENSIONS
17-1/2 inches (44.5cm) wide by 7-1/16 inches (17.9cm) high. Depth behind front panel is 18-1/8 inches (46cm) including connectors. Knob clearance required in front of the mounting panel is 1-1/8 inches (2.9cm).
2
MA6500
1. The heavy lines on the schematics denote the primary signal path.
2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. AC input at 120 volts, 50/60Hz b. All voltages are +\-10% with respect to ground. A high impedance (10megaohm) voltmeter must be used.
3. Unless otherwise specified: a. Resistors values are in ohms.
b. Capacitor values are in microfarads (uF).
c. Inductor values are in microhenries (uH).
4. On PC Board Drawings, Square Pad Indicates: a. Polarized Capacitors - Positive b. Diode - Cathode c. Others - Pin 1
5. The voltages enclosed in a box are signal voltages that are measured with a 2.5mV, 1kHz signal connected to both channels at the TUNER input jacks.
NOTES
Front panel controls are set at:
BALANCE .................................... CENTER DETENT
TREBLE BASS ............................. CENTER DETENT
INPUT SELECTORS ...................................... TUNER
LOUDNESS .......................................................... OFF
POWER ................................................................... ON
VOLUME ................................. FULLY CLOCKWISE
MONO ................................................................... OFF
SPEAKER SWITCHES 1 AND 2 ........................... ON
Rear panel controls are set at:
PROCESSOR ........................................................ OUT
PWR AMP INPUT ................................................. INT
SPEAKER TERMINALS .................... NO LOAD ON
OUTPUTS
6.
WARNING:
Parts marked with the symbol have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
3
REAR PANEL
W A R N IN G
SH O C K H AZARD - D O N O T O PE N . FO R
C O NTIN U ED PR O TEC TIO N AG A IN ST FIRE H AZARD
R EPL AC E O N LY W ITH SA M E T YPE A ND R ATIN G FUS E.
A VIS
R ISQ UE DE C H O C - EL EC TR IQ UE - NE PAS
O U VRIR. R EM PLAC ER PAR U N FUSIBLE DE ME M E
TYPE , AM P ERA G E E T VO LTAG E.
W A R N IN G
R ISK O F HA ZA R DO US E NE R G Y! M AK E
P RO P E R SPE A KE R C O N N EC TIO N S.SEE O PER AT IN G
M ANU AL BEFO R E U SIN G .
AV IS
EN E R G IE EL EC T R IQ U E D A N G ER E USE ! V O IR LE
C AH IER D ’INS TR U C TIO N .
120V 5 0 /6 0 H z 4A
R IG H T
M A 6 5 0 0 I N T E G R A T E D A M P L IF IE R
M cIN TO S H LA BO R ATO R Y, INC ., B IN G H AM TO N , N EW YO R K M ADE IN U SA
SER IAL
N UM B ER
L E FT R IG H T LE FT
T 10A L 250 V
S LO BL O
VID EO
D ATA P O R T S
TU N ER C D 2
E X T S E N S O R
PO W ER
CO NTR O L
SU M HO M E TAPE
C D 1
AU X
R
L
PO W ER
AM P IN
EXT IN T
PO W ER
AM P IN PUT
M AIN
O U T
TA PE
O UT
L
TAPE
R
VID EO
IN P U T S
TU N ER C D 2
L
R
C D 1 G ND
PH AU X
H E AT S IN K
P C B 3
SECTION LOCATIONS
2
IN P U T /D R IV E R
P C B
4
L A M P
P C B
T O N E
P C B 7
6
C O N T R O L
P C B
5
P G D IS P L AY
P C B
4
MA6500
BLOCK DIAGRAM
CD1
CD2
LEFT
CHANNEL
INPUTS
TUNER
VIDEO
TAPE
AUX
PHONO
R IAA
AMP
PHONO
RIGHT
CHANNEL
INPUTS
AUX
TAPE
VIDEO
TUNER
CD2
CD1
POWER
CONTROL
DATA
PORTS
AUX
TAPE
VIDEO
TUNER
CD2
CD1
SUM
HOME
R IAA
AMP
INPUT
ELECTRO-
MAGNETIC
SWITCHING
ELECTRO-
MAGNETIC
DATA
PORT
REGISTER
EXT IR
SENSOR
LOUDNESS
COMPENSATION
CONTROL
MONO
SWITCHING
LOUDNESS
COMPENSATION
CONTROL
INPUT
SELECTOR
LOGIC
MICRO
CONTROLLER IR
SENSOR
MONO
SWITCHING
120VAC
50/60Hz
SUPER TRACKING
VOLUME CONTROL
SUPER TRACKING
VOLUME CONTROL
20dB
AMP
20dB
AMP
MAIN
FUSE
IN RUSH
CURRENT
LIMITER
THERMAL
PROTECTION
BALANCE
CONTROL
TONE
CONTROLS
TONE
AMP
TURN-ON
DELAY
OUTPUT
MUTING
HEAD-
PHONE
AMP
TO PREAMP IN (INT)
PREAMP OUT LEFT
OUTPUT
MUTING
LOGIC
MATCHING
NETWORK
BALANCE
CONTROL
TONE
AMP
OUTPUT
MUTING
HEAD-
PHONE
AMP
TO PREAMP IN (INT)
PREAMP OUT RIGHT
POWER
TRANSFORMER
RECTIFIERS
AND FILTERS
LAMP CONTROL
LOGIC
LAMP
FUSE
MAIN
RELAYS
FRONT PANEL
LAMPS
MAIN
SUPPLY
5.6V
REGULATOR
15V
REGULATOR
-15V
REGULATOR
5.6V
15V
-15V
11.5VAC
B+
B-
HEAD
PHONE
5 6
BLOCK DIAGRAM
LEFT PG
INDICATOR
PG
INDICATOR
DRIVER
PRE AMP LEFT
(INT)
TO PRE AMP
OUT (INT)
PRE AMP IN
(EXT)
POWER AMP
INPUT
SWITCH
ELECTRONIC
ATTENUATOR
POWER
GUARD
TO MICRO CONTROLLOR
PRE AMP RIGHT
(INT)
PRE AMP IN
(EXT)
TO PRE AMP
OUT (INT)
POWER AMP
INPUT
SWITCH
RIGHT PG
INDICATOR
PG
DRIVER
ELECTRONIC
ATTENUATOR
POWER
GUARD
DIFF
AMP
CURRENT
SOURCE
DIFF
AMP
CASCODE
VOLTAGE
AMP
CASCODE
VOLTAGE
AMP
DC
BIAS
+
PREDRIVER
-
PREDRIVER
+
DRIVER
POSITIVE
CURRENT
LIMITER
+
OUTPUT
-
DRIVER
NEGATIVE
CURRENT
LIMITER
-
OUTPUT
NEGATIVE
FEEDBACK
NEGATIVE
FEEDBACK
VOLTAGE
LOG
AMP
-
DRIVER
NEGATIVE
CURRENT
LIMITER
-
OUTPUT
VOLTAGE
LOG
AMP
DIFF
AMP
CURRENT
SOURCE
CASCODE
VOLTAGE
AMP
DC
BIAS
-
PREDRIVER
DIFF
AMP
CASCODE
VOLTAGE
AMP
+
PREDRIVER
+
DRIVER
POSITIVE
CURRENT
LIMITER
+
OUTPUT
RECTIFIER
DC
AMP
LEFT
METER
SPEAKER
SWITCHING
RECTIFIER
DC
AMP
RIGHT
METER
TURN ON
DELAY
THERMAL
PROTECTION
SPEAKER
SWITCHING
LEFT
OUTPUT
SPEAKER 1
SPEAKER 2
RIGHT
OUTPUT
SPEAKER 1
SPEAKER 2
7 8
INTERCONNECT
MA6500
9 10
0
2
INPUT DRIVER
049193 SH 1 OF 3
11 12
2
INPUT DRIVER
049193 SH 2 OF 3
MA6500
13 14
2
INPUT DRIVER
049193 SH 3 OF 3
15 16
2
INPUT DRIVER
MA6500
17 18
3A 3B
HEATSINK
049194
4A 4B
LAMP
049235
19 20
5
PG DISPLAY
049236
MA6500
6
CONTROL
049195
21 22
7
TONE
049268
23 24
0
MA6500
7
TONE
049268
PARTS LIST
061273
064254
064267
064312
064318
064364
066269
066309
066330
066344
066360
066361
066445
PART NO
049193 INPUT DRIVER
003611
061196
061199
061248
061268
066446
066447
DESCRIPTION
CARD MOUNTING BRACKET
DISC CAP 47PF,20%,N470 50V
DISC CAP 100PF 10% N1500 50V
DISC CAP .1MF,25V,Y5T
MONO CAP .1UF,50V,Z5U
220PF 5% 100V NPO
M POLY FILM CAP .1MF,10%,100V
M. POLYESTER CAP .22MF,400V
CAP M POLY .01UF 5% 63VDC
CAP M POLY .033UF 5% 63/100VDC
CAP POLYPROP .047MF 10% 250V
CAP ELECT 1UF 10% 50V
CAP ELECT 1000UF 10V
CAP ELECT 220UF 16V SHORT CAN
CAP ELECT 100UF 25V
CAP ELECT 3300UF 35V
CAP ELECT 1000UF 20% 35V
ELECT CAP 10MF, 50V AMMO PACK
ELECT CAP 47MF, 35V AMMO PACK
ELECT CAP 100MF 16V AMMO PACK
REFERENCE NO
SP1 SP2
C146 C152 C157 C159
C58 C61 C72 C73 C74
C75 C76 C78 C140 C141
C156 C158
C32 C33 C55
C62 C63 C64 C65 C66
C67 C68 C69 C70 C71
C161 C162 C171 C172
C173 C174 C175
C129
C145
C165 C167
C166 C168
C47 C144
C115 C116
C132
C163 C164
C133 C134
C125 C127 C128
C126
C30 C85 C86 C87 C88
C89 C90 C91 C93 C94
C95 C96 C97 C98 C99
C100 C102 C103 C104
C105 C106 C115 C117
C118 C123 C124 C153
C154 C177
C92 C101
C22 C40 C119 C120
C121
25
066462
066469
066504
070047
070130
070131
070139
087050
087057
087069
087072
089089
117215
117219
117244
117279
117404
117436
117455
117494
117549
117708
117712
117717
122297
132172
132193
ELECT CAP 1O UF 100VDC AMMO
ELECT CAPACITOR 470MF 50V T&R
CAPACITOR ELECT 25000UF 75V
SILICON DIODE 1N4148 T&R
ZENER DIODE 8.2V,1/2W
DIODE RECTIFIER
RECTIFIER BRIDGE MC1000
REED RELAY FORM 1A,5V,500 OHMS
RELAY
POWER RELAY TV5 24V
RELAY 24V TV8/VDE CERTIFIED
FUSE 2A SLO-BLO 5X20
4-PIN CONNECTOR
MALE CONN 10 POS
FRICTION LK CONN 9POS MALE
11-POS. MALE CONN.
HEADER 2-PIN 0.156
PJ261G PHON JACK, GOLD
PHONO JACK 8P, GOLD PLATED
MINI JACK
HEADPHONE JACK DUAL BLACK 1/8
FASTON BLADE W/FEET
FASTON BLADE .110
MTA-156 HEADER 8PIN
CHOKE OUTPUT .65UH
TRANSISTOR SI PNP MPSA55
TRANSISTOR J.F.E.T. 2N4392
C35 C36 C37 C38
C176
C142 C143
D1 D3 D4 D5 D6 D7 D8
D9 D10 D21 D22 D25
D26 D27
D2
D11 D12 D13 D14 D15
D16 D23 D24
D28
K2 K3 K4 K5 K6 K7 K8
K9 K10 K11 K12 K13
K16 K17 K18 K20
K1 K21
K24
K22 K23
F1
J3 J8
J1
J6 J7
J2
J4 J5
J23
J21 J22
J28
J24 J25 J26 J27
J10 J11 J12 J13 J14 J15
J16 J17 J18 J19 J2
J20
J9
L2 L3
Q50
Q62 Q64
132224
132254
132255
132261
132262
133028
133067
133108
133153
133154
133175
133180
133186
133260
133360
134389
137042
141165
144053
144071
144086
144090
132223
144095
TRANSISTOR NPN MPS4124 2K/REEL
TRANSISTOR PNP
TRANSISTOR NPN
TRANSISTOR PNP
TRANSISTOR PNP
TRANSISTOR NPN
IC OPERATIONAL AMPLIFIER
NE5534AN OP AMP LOW NOISE
IC +5V REGULATOR
IC REGULATOR -15V
Q44 Q46 Q47Q57 Q58
Q59 Q61Q63 Q66 Q75
Q78 Q79 Q80 Q81 Q83
Q87 Q88
Q1 Q40 Q48 Q49 Q52
Q69 Q73 Q74 Q76 Q77
Q54 Q55 Q56 Q67 Q68
Q71 Q85 Q86
Q2 Q51 Q53 Q65 Q70
Q72
Q18 Q82
Q17 Q84
IC1 IC3
IC16 IC17
IC5
IC6
IC REGULATOR 15V
IC AND 2 INPUT X 4
LB1720 8 LN DRIVER ARRAY
IC SHFT REG SER-PAR
DUAL OPERATIONAL AMPLIFIER IC2 IC4 IC15
OCTAL DAR TRANS ARRAY W/DIODE IC8
TRIM POT 100K,10%,3/8SQ.
FLAMEPROOF RES 47 OHM 5% 1/4W
RES CF 10 5% 1/2W
R237 R238
R56 R60
R77 R79 R119 R230
R231 R232
RES MF 10K 1% 1/4W
IC7
IC14
IC10 IC13
IC9 IC11 IC12
METAL FILM RES 365 OHM 1% 1/4W
R122 R134 R171 R217
R218
R265 R266 R267 R268
METAL FILM RES 475 OHM 1% 1/4W
METAL FILM RES 1K 1% 1/4W
RES MF 3.32K 1% 1/4W
R269 R270 R271 R272
R45 R167 R168 R187
R36 R164 R170 R184
R241 R242 R249 R255
R262 R263 R264
R41 R55 R188 R193
26
PARTS LIST
con’t
144097
144107
144108
144113
144119
144125
144127
144141
144154
144160
144172
144187
144191
144196
144210
144220
144225
144262
METAL FILM RES 4.75K 1% 1/4W
METAL FILM RES 40.2K 1% 1/4W
RES MF 47.5K 1% 1/4W
RES MF 100K 1% 1/4W
METAL FILM RES 332K 1% 1/4W
METAL FILM RES 150K 2% 1/4W
METAL FILM RES 95.3K 1% 1/4W
METAL FILM RES 27.4K 1% 1/4W
RES MF 12.1K 1% 1/4W
METAL FILM RES 22.1OHM 1% 1/4W
RES MF 221 OHMS 1% 1/4W
METAL FILM RES 22.1K 1% 1/4W
RESISTOR MF 1.21K 1% 1/4W
METAL FILM RES 100 OHM 1% 1/4W
RES MF 7.5K 1% 1/4W CRB1/4FX
95.3 OHMS 1% 1/4W MF
MF RES, 30K OHM 1% 1/4W
RES NETWORK, 2X220K, ISO
144264
144265
144273
144338
144378
144440
144441
144442
144443
148059
178159
METAL FILM RES 10M 1% 1/4W
METAL FILM RES 2.21M 1/4W
RESISTOR MF 182 OHM 1/4W 1%
RES MF 324 OHM 1% 1/4W
RES MF 2.21 OHM 1/4W 1%
MF RES 14.3K 1% 1/4W
METAL FILM RES 274K 1% 1/4W
METAL FILM RES 47.5 1% 1/4W
METAL FILM RES 681K 1% 1/4W
SLIDE SWITCH
FUSE HOLDER 5X20MM PCB MOUNT
049194 HEATSINK
061023 DISC CAP 100PF 10% N1500
061159
061248
064363
066446
CERAMIC CAP .01MF +80-20% 50V
DISC CAP .1MF,25V,Y5T
CAP POLYPROP 0.15MF 10% 250VDC
ELECT CAP 47MF, 35V AMMO PACK
070047
070133
117213
117244
117404
132223
132224
132261
SILICON DIODE 1N4148 T&R
DIODE 200V,6A
2-PIN MALE CONNECTOR
FRICTION LK CONN 9POS MALE
HEADER 2-PIN 0.156
TRANSISTOR NPN MPS4124 2K/REEL
TRANSISTOR PNP
TRANSISTOR PNP
132262
134390
137093
137094
137095
137096
139177
TRANSISTOR NPN
TRIM POT 200 OHM 20% HORIZ AD
MET OX 680 5% .5W
MET OX 1.8K 5% .5W
MET OX 430 5% .5W
MET OX 47 5% .5W
WIREWOUND RES 0.5 OHM 5W 5%
144053
144172
144279
144378
RES MF 10K 1% 1/4W
RES MF 221 OHMS 1% 1/4W
THERMISTOR 100 OHM
RES MF 2.21 OHM 1/4W 1%
R46 R86 R177 R222
R227 R233 R234
R161 R192
R29 R62 R65 R66 R69
R175 R181 R182 R247
R251
R100 R162 R196 R228
R221 R226
R169 R190
R248 R257
R219 R223
R128 R172
R152 R156
R51 R53 R145 R146
R160 R186 R239 R240
R104 R105
R38 R101 R159 R173
R67 R68 R136 R137
R138 R139 R140 R141
R142 R144 R150
R245 R253
R246 R256
R147 R148 R258 R259
R1 R2 R3 R4 R5 R6 R7
R154 R243
R220 R224
R225 R229
R157 R205
R163 R194
R250 R252
R50 R165
R52 R158 R176
R178 R179 R195
R244 R254
R30 R37 R83 R166 R174
S1 S2
F1
C7 C8
C9 C16
C3 C5
C10
C1 C2
D1 D2 D3 D4 D5
D6 D7
J3
J1
J2
Q1
Q2
Q7
Q6
R13
R2 R9
R6 R11
R7
R12
R31 R32 R33 R34 R35
R36 R37 R38
R3 R10
R1 R8
RT1
R30
27
049195 CONTROL
058153
061268
061273
061277
066254
066330
070093
117216
117279
117462
121031
133175
133186
133191
133241
133394
144053
144090
144113
144157
144196
144290
144338
144378
144444
150058
178139
180039
INCANDESCENT LAMP 14V 100MA
MONO CAP .1UF,50V,Z5U
220PF 5% 100V NPO
MONO CAP 0.1MF 20% 50V
CAP ELECT 220UF 50V 20%
CAP ELECT 220UF 16V SHORT CAN
LED LAMP RED
MALE CONN 5-PIN 0.1 POST ASSY
11-POS. MALE CONN.
PHON JACK 1 1/8” STEREO VER
IR SENSOR 38KHZ
IC AND 2 INPUT X 4
IC SHFT REG SER-PAR
IC DC MOTOR DRIVER
IC MICROPRCSSR RESET POS
PROGRAMMED DEVICE
RES MF 10K 1% 1/4W
METAL FILM RES 1K 1% 1/4W
RES MF 100K 1% 1/4W
METAL FILM RES:10 OHMS 1% 1/4W
METAL FILM RES 100 OHM 1% 1/4W
RES NETWORK 3 X 10K BUSSED
RES MF 324 OHM 1% 1/4W
RES MF 2.21 OHM 1/4W 1%
METAL FILM RES 75 1% 1/4W
TACT SWITCH
IC SOCKET 24-PIN
CERAM RESON 6.0MHZ W/CAP
049235 LAMP
058120 LAMP 14V #7373
117240
117274
4 PIN RT. ANGLE
CONN. 2 POS. R-ANGLE
049236 POWER GUARD
058133
058153
117215
117216
AMBER LED
INCANDESCENT LAMP 14V 100MA
4-PIN CONNECTOR
MALE CONN 5-PIN 0.1 POST ASSY
DS1 DS2 DS3
J1
J2
DS1 DS2
DS3 DS4
J2 J3 J4
J1
049268 TONE
061191
061196
061256
061260
061268
064254
064318
064329
066330
066345
066378
066445
066446
070047
087050
117219
117707
DISC CAP 22PF,10%,NPO 50V
DISC CAP 47PF,20%,N470 50V
M.CAP 470PF,5%,100V
MONOLYTHIC, 220PF
MONO CAP .1UF,50V,Z5U
C3 C4
C16 C17
C26 C27 C38 C39
C1 C2
C28 C30 C31 C33 C36
C37
C5 C6 M POLY FILM CAP .1MF,10%,100V
CAP M POLY .033UF 5% 63/100VDC
CAP M POLY .22UF 5% 63VDC
CAP ELECT 220UF 16V SHORT CAN
CAP ELECT 22UF 50V
CAP ELECT 47UF 16V BP
ELECT CAP 10MF, 50V AMMO PACK
ELECT CAP 47MF, 35V AMMO PACK
SILICON DIODE 1N4148 T&R
C18 C19 C20 C21
C40 C41 C42 C43
C44 C45
C9 C12
C15
C7 C10 C11 C14 C34
C35
C22 C2324 C25
D1 D2
REED RELAY FORM 1A,5V,500 OHMS K1 K2 K3
MALE CONN 10 POS J1
CONNECTOR MALE 6 POS RT ANGLE J2
DS13 DS14 DS15 DS16
DS17 DS18
C3 C5 C6 C7 C10
C8 C9
C1
C2
C4
DS1 DS2 DS3 DS4 DS5
DS6 DS7 DS8 DS9 DS10
DS11 DS12
J4
J1
J3
MT1
IC1
IC3 IC4
IC2
IC6
R5 R16
R14 R15
R2
R4
R1
R6
R7 R8 R9 R10 R11 R12
R13
R19
R3
S1 S2 S3 S4 S5 S6 S7 S8
S9 S10 S11S12
IC5
Y1
133260
134457
134464
134490
144015
144053
144086
144090
144095
144107
144113
144157
144160
144195
144196
144298
144304
144364
DUAL OPERATIONAL AMPLIFIER
POT, EQUAL
POTENTIOMETER BALANCE 2KOHM
POTENTIOMETER 50KAX2
METAL FILM RES 33.2K 1% 1/4W
RES MF 10K 1% 1/4W
METAL FILM RES 475 OHM 1% 1/4W
METAL FILM RES 1K 1% 1/4W
RES MF 3.32K 1% 1/4W
METAL FILM RES 40.2K 1% 1/4W
RES MF 100K 1% 1/4W
METAL FILM RES 10 OHMS 1% 1/4W
METAL FILM RES 22.1OH 1% 1/4W
MF RES, 681 OHM 1% 1/4W
METAL FILM RES 100 OHM 1% 1/4W
MF 2.21K 1% 1/4W
MF 2.74K 1% 1/4W
RES MF 475K 1% 1/4W
IC1 IC2 IC3 IC4
R33 R34
R32
R1
R23 R25
R9 R27
R14 R28
R6 R11 R13 R17
R21 R22
R39 R40
R12 R15 R16 R29 R36
R38
R8 R10
R2 R26
R5 R20
R35 R37
R30 R31
R3 R18 R19 R24
R4 R7
28
0
EXPLODED VIEW
MA6500
29 30
EXPLODED VIEW PARTS LIST
Part
No.
094350
017764
022314
017363
004966
049195
129284
100275
021030
078031
049236
021094
102001
124074
092341
016404
004899
018612
101042
171260
017531
017517
017736
078033
090258
104073
018605
101172
101054
018587
092342
017447
049235
114072
159310
102007
004964
102003
004965
017218
104080
100159
101176
074091
104001
104004
102022
112038
021038
084135
106007
049194
Ref.
No.
27
28
29
30
23
24
25
26
16
17
18
19
20
21
22
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
46
47
48
49
42
43
44
45
35
36
37
38
31
32
33
34
39
40
41
50
51
52
Description
FRONT PANEL GLASS
EXTRUSION BRACKET
END CAP
TS 4-40 X 1/2 SLOT FILLISTER
C/A INPUT/POWER SWITCH
PUSHBUTTON ASSY RED
PUSHBUTTON ASSY
HEADPHONE BEZEL
O-RING
KNOB 25mm INDEX
FELT W MPI-4 1/4 X 5/8
BOTTOM EXTRUSION
TCS 6-32 X 1/4 PHIL FLAT U/C
TS 6-32 X 1/4 PHIL PAN TAPTITE
TOP EXTRUSION
SENSOR GASKET
DISPLAY PLEXIGLAS
FISHPAPER SHEILD
PLEXIGLAS FILTER LIGHT BLUE
SUBPANEL
CONTROL PCB ASSY
TONE PCB ASSY
MS 6-32 X 1/2 PHIL BLK TRUSS HD
SPACER 6 X 1/4
GROMMET
POWER GUARD DISPLAY ASSY
SPACER 4 X 1/4
KEP NUT 4-40 CADMIUM PLATE
MC202 METER
FILTER AZURE BLUE
FILTER PALE BLUE
PLASTIC LIGHT BOX
LAMP PCB ASSY
PLASTIC RIVET
POWER TRANSFORMER
MACH NUT 1/4-20 W/LOCK
TRAY
MACH NUT 6-32 W/LOCK
CHASSIS
PLASTIC FEET - BLACK
FLAT WASHER #10 CLEAR ZINC
MS 10-32 X 3/4 PHIL PAN ZINC
TCS 6-32 X 1/2 PH PAN BLK TYPE F
AC TERMINAL BLOCK
FLAT STEEL WASHER #4 X 9/32 X .025
LK WASHER 5 X .255 INT STAR
MN 4-40 3/16 X 1/16
STL SPACER 4 X 3/8 L NICKEL PLT
SPACER #6 X 3/8
THERMAL PAD MC7150
SPRING CLIP LATCH TYPE
HEATSINK PCB ASSY
104016
178122
117487
117369
101197
084124
084112
004962
101109
004798
101078
017706
100072
100126
094017
101059
114119
114118
112087
084194
018616
017160
049193
102014
110009
104130
104148
004800
100250
102020
79
80
81
82
75
76
77
78
68
69
70
71
72
73
74
64
65
66
67
60
61
62
63
53
54
55
56
57
58
59
SM 6 X 5/8 PHIL PAN TYPE A
TRANSISTOR CLIP 214
TRANSISTOR CLIP 218
PCB SPACER 1/4”
ISOSTRATE
AMPLIFIER HEATSINK 4 INCH
MOUNTING TAB W/.140 DIA MTG
INPUT/DRIVER PCB ASSY
MACH NUT 6-32 W/LOCK
NUT M5 X 0.8 BRASS W/GOLD PLATE
LW #10 SPLIT PHOS/BRONZE
FLAT WASHER BRASS
OUTPUT PLATE
SEMS 6-32 X 1/4 PHIL PAN
MACH NUT 6-32 SELF-LOCK
LK WASHER 1/2 X .630 X .022 INT STAR
SOCKET FUSEHOLDER UL/CSA
MC1000 AC LINE RECEPTACLE
COAX RECEPTACLE GOLD TYPE F
HI/LO 4-32 X 3/8 PH ROUND BLACK
DUAL BINDING POST
GROUND POST (GOLD) 4300
REAR PANEL
TS 6-32 X 5/16 PHIL PAN
TOP COVER
TS 8-32 X 5/16 PHIL PAN
TERMINAL COVER
LOCK WASHER 1/4 X .396 INT STAR
MS 1/4-20 X 5/8 PHIL PAN BLACK
FOAM TAPE 1/4 X 1/4
31
NOTES
32
REPACKING INSTRUCTIONS
33
INTEGRATED AMPLIFIER
SERVICE MANUAL
The continuous improvement of it’s products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design with out notice.
Because of the constant upgrading of McIntosh products’ circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only.
McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 040703
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