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INTEGRATED AMPLIFIER
WA T TS WA T TS
. 02 . 20 2.0 20 20 0 40
0 . 02 . 20 2.0 20 20 0 40
0
-40 -30 - 20 -10 -4 0 -30 - 20 -10
0 0
D E C IB EL S D E C I B EL S
POWER OUTPUT POWER OUTPUT
POW ER GUARD
B A SS T R EB L E B A LA N C E V O LU M E
LEFT R IG H T L R
CD 1 CD 2 TUN ER V ID E O P H / AU X TA P E MONO 1 S PE AK ER S 2 MU TE LOUD S TA N D B Y / O N
HE ADPH ON ES
SE N S O R
CONTENTS
Performance Specifications ........................................ 2 Lamp Schematic and PCB ................................. 19 - 20
Notes ......................................................................... 3 PG Display Schematic and PCB ........................ 21 - 22
Rear Panel .................................................................. 4 Control Schematic and PCB .............................. 21 - 22
Section Location ........................................................ 4 Tone Schematic and PCB .................................. 23 - 26
Block Diagram ...................................................... 5 - 8 Parts List ............................................................ 25 - 28
Interconnection Diagram .................................... 9 - 10 Exploded View and Parts List ............................. 29 - 31
Input Driver Schematic and PCB ....................... 11 - 18 Repacking Instructions ............................................. 33
Heatsink Schematic and PCB ............................ 19 - 20
SERVICE MANUAL
PREFORMANCE SPECIFICATIONS
POWER OUTPUT, STEREO INPUT IMPEDANCE
250, 200, 120 watts minimum sine wave continuous Phono: 47k ohms, 65pF
average power output per channel, both channels operat- High Level: 22k ohms
ing, into a load impedance of 2, 4 and 8 ohms respec-
tively. MAXIMUM INPUT SIGNAL
Phono: 90mV
TOTAL HARMONIC DISTORTION High Level: 8V
0.005% maximum at any power level from 250 milliwatts
to rated power per channel from 20Hz to 20,000Hz, both POWER REQUIREMENT
channels operating. 120V, 50/60Hz, 5.0 Amps UL/CSA
230V, 50/60Hz, 2.5 Amps
INTERMODULATION DISTORTION
0.005% maximum if instantaneous peak power output per PREAMPLIFIER MAXIMUM VOLTAGE OUTPUT
channel does not exceed twice the rated output with both Phono: 90mV at tape output
channels operating for any combination of frequencies High Level: 8V at tape output
from 20Hz to 20,000Hz. Main Out: 8V at preamp output
OUTPUT LOAD IMPEDANCE VOLTAGE GAIN
2, 4 or 8 ohms High Level to Tape: 0dB
High Level to Main: 20dB
RATED POWER BAND
20Hz to 20,000Hz TONE CONTROLS
Bass Control: +/-12dB at 20Hz
DYNAMIC HEADROOM Treble Control: +/-12dB at 10kHz
2.4dB at 2, 4 or 8 ohms
POWER REQUIREMENTS
DAMPING FACTOR 100 Volts, 50/60Hz at 4.8 Amps
60 at 2 ohms 110 Volts, 50/60Hz at 4.4 Amps
120 at 4 ohms 120 Volts, 50/60Hz at 4.0 Amps
230 at 8 ohms 220 Volts, 50/60Hz at 2.0 Amps
230 Volts, 50/60Hz at 2.0 Amps
FREQUENCY RESPONSE 240 Volts, 50/60Hz at 2.0 Amps
+0, -0.5dB from 20Hz to 20,000Hz
NOTE: Refer to the rear panel of the MA6500 for the correct voltage.
SIGNAL TO NOISE RATIO, (A WEIGHTED)
Phono Input: 90dB (84dB IHF) below 10mV input DIMENSIONS
High Level: 100db (90dB IHF) below rated output 17-1/2 inches (44.5cm) wide by 7-1/16 inches (17.9cm)
Power Amplifier: 110dB below rated output high. Depth behind front panel is 18-1/8 inches (46cm)
including connectors. Knob clearance required in front of
SENSITIVITY the mounting panel is 1-1/8 inches (2.9cm).
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
2
MA6500
NOTES
1. The heavy lines on the schematics denote the primary Front panel controls are set at:
signal path. BALANCE .................................... CENTER DETENT
TREBLE BASS ............................. CENTER DETENT
2. Unless otherwise noted, all voltages indicated on the INPUT SELECTORS ...................................... TUNER
schematics are measured under the following condi- LOUDNESS .......................................................... OFF
tions: POWER ................................................................... ON
a. AC input at 120 volts, 50/60Hz VOLUME ................................. FULLY CLOCKWISE
b. All voltages are +\-10% with respect to ground. A MONO ................................................................... OFF
high impedance (10megaohm) voltmeter must be SPEAKER SWITCHES 1 AND 2 ........................... ON
used.
Rear panel controls are set at:
3. Unless otherwise specified: PROCESSOR ........................................................OUT
a. Resistors values are in ohms. PWR AMP INPUT ................................................. INT
b. Capacitor values are in microfarads (uF). SPEAKER TERMINALS .................... NO LOAD ON
c. Inductor values are in microhenries (uH). OUTPUTS
4. On PC Board Drawings, Square Pad Indicates: 6. WARNING:
a. Polarized Capacitors - Positive Parts marked with the symbol have critical
b. Diode - Cathode characteristics. Use ONLY replacement parts recom-
c. Others - Pin 1 mended by the manufacturer.
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.
3
REAR PANEL
W A R N IN G S H O C K H A Z A R D - D O N O T O P E N . FO R
C O N T IN U E D P R O TE C TI O N A G A IN S T FI R E H A Z A R D
M A 6 5 0 0 I N T E G R AT E D A M P L IF IE R
M c IN TO S H LA B O R AT O R Y, IN C ., B IN G H A M T O N , N E W Y O R K M A D E IN U S A
R E P L A C E O N LY W IT H S A M E T Y P E A N D R AT IN G F U S E .
A V IS R IS Q U E D E C H O C - E L E C TR IQ U E - N E PA S S E R IA L
O U V R I R . R E M P L A C E R PA R U N F U S I B L E D E M E M E N UM B ER
T Y P E , A M P E R A G E E T V O LTA G E .
W A R N IN G R IS K O F H A ZA R D O U S E N E R G Y ! M A K E
P R O P E R S P E A K E R C O N N E C T IO N S . S E E O P E R AT IN G
M A N U A L B E FO R E U S IN G . R IG H T L E FT R IG H T L E FT
AV IS E N E R G IE E L E C T R IQ U E D A N G E R E U S E ! V O IR L E
C A H IE R D 'I N S TR U C TI O N .
120V 5 0 /6 0 H z 4A
D ATA P O R T S PO W ER M A IN TA P E IN P U T S
A M P IN OUT O UT TA P E V ID E O TU N E R CD 2 CD 1 P H /A U X G ND
V ID E O TU N E R CD 2 CD 1
T 1 0A L 2 50 V
S L O BL O EXT SENSOR L L L
PO W ER SUM HO M E TA P E AUX E X T IN T
CO NTR OL PH AUX
R R R
POW ER
A M P IN P U T
SECTION LOCATIONS
IN P U T /D R IV E R
2
PCB
H E AT S IN K
3
PCB
LAM P
4
PCB
TO NE
7
PCB
6 5
CONTROL P G D IS P L AY
PCB PCB
4
MA6500
BLOCK DIAGRAM
HEAD-
CD1 PHONE
AMP
CD2
TUNER
INPUT
LEFT
VIDEO ELECTRO- TO PREAMP IN (INT)
CHANNEL MONO SUPER TRACKING 20dB BALANCE TONE OUTPUT
MAGNETIC
INPUTS TAPE SWITCHING VOLUME CONTROL AMP CONTROL AMP MUTING
SWITCHING PREAMP OUT LEFT
AUX
LOUDNESS TURN-ON
R IAA COMPENSATION DELAY
PHONO
AMP CONTROL
OUTPUT
MATCHING HEAD
MUTING
NETWORK PHONE
LOGIC
TONE
R IAA LOUDNESS CONTROLS
PHONO
AMP COMPENSATION
CONTROL
AUX INPUT
RIGHT
ELECTRO- TO PREAMP IN (INT)
CHANNEL TAPE MONO SUPER TRACKING 20dB BALANCE TONE OUTPUT
MAGNETIC
INPUTS SWITCHING VOLUME CONTROL AMP CONTROL AMP MUTING
VIDEO SWITCHING PREAMP OUT RIGHT
TUNER
CD2
HEAD-
CD1 PHONE
AMP
POWER
CONTROL INPUT
SELECTOR
AUX LOGIC
5.6V
TAPE 5.6V
IN RUSH REGULATOR
VIDEO CURRENT
DATA
DATA MICRO LIMITER
TUNER PORT 120VAC MAIN POWER RECTIFIERS 15V
PORTS CONTROLLER IR 15V
REGISTER 50/60Hz FUSE TRANSFORMER AND FILTERS REGULATOR
CD2 SENSOR
CD1 LAMP CONTROL
-15V
LOGIC -15V
SUM REGULATOR
HOME
LAMP FRONT PANEL
11.5VAC
FUSE LAMPS
EXT IR
SENSOR
B+
MAIN MAIN
THERMAL RELAYS SUPPLY
B-
PROTECTION
5 6
BLOCK DIAGRAM
POSITIVE
CURRENT
LIMITER
LEFT
OUTPUT
PG CASCODE SPEAKER 1
LEFT PG
INDICATOR
POWER DIFF
VOLTAGE + + + SPEAKER
INDICATOR GUARD AMP PREDRIVER DRIVER OUTPUT SWITCHING
DRIVER AMP SPEAKER 2
CURRENT DC
SOURCE BIAS
TO PRE AMP
OUT (INT) POWER AMP
PRE AMP LEFT ELECTRONIC
INPUT
(INT) ATTENUATOR
PRE AMP IN SWITCH CASCODE
(EXT)
DIFF
AMP
VOLTAGE -
PREDRIVER
-
DRIVER
-
OUTPUT
AMP
NEGATIVE
VOLTAGE DC LEFT
CURRENT RECTIFIER
LOG AMP METER
LIMITER
AMP
NEGATIVE
FEEDBACK
TO MICRO CONTROLLOR
NEGATIVE
FEEDBACK
TURN ON THERMAL
DELAY PROTECTION
NEGATIVE
VOLTAGE DC RIGHT
CURRENT RECTIFIER
LOG AMP METER
LIMITER
AMP
CASCODE
PRE AMP IN
DIFF
AMP
VOLTAGE -
PREDRIVER
-
DRIVER
-
OUTPUT
POWER AMP AMP
PRE AMP RIGHT (EXT) ELECTRONIC
INPUT
(INT) ATTENUATOR
TO PRE AMP SWITCH
OUT (INT)
CURRENT DC
SOURCE BIAS
RIGHT
OUTPUT
CASCODE SPEAKER 1
RIGHT PG PG POWER DIFF
VOLTAGE + + + SPEAKER
INDICATOR DRIVER GUARD AMP PREDRIVER DRIVER OUTPUT SWITCHING
AMP SPEAKER 2
POSITIVE
CURRENT
LIMITER
7 8
MA6500
INTERCONNECT
9 100
2 INPUT DRIVER 049193 SH 1 OF 3
11 12
MA6500
2 INPUT DRIVER 049193 SH 2 OF 3
13 14
2 INPUT DRIVER 049193 SH 3 OF 3
15 16
MA6500
2 INPUT DRIVER
17 18
3A 3B HEATSINK 049194
4A 4B LAMP 049235
19 20
MA6500
5 PG DISPLAY 049236
6 CONTROL 049195
21 22
7 TONE 049268
23 240
MA6500
7 TONE 049268
PARTS LIST
PART NO DESCRIPTION REFERENCE NO 066462 ELECT CAP 1O UF 100VDC AMMO C35 C36 C37 C38 132223 TRANSISTOR NPN MPS4124 2K/REEL Q44 Q46 Q47Q57 Q58
066469 ELECT CAPACITOR 470MF 50V T&R C176 Q59 Q61Q63 Q66 Q75
049193 INPUT DRIVER 066504 CAPACITOR ELECT 25000UF 75V C142 C143 Q78 Q79 Q80 Q81 Q83
003611 CARD MOUNTING BRACKET SP1 SP2 070047 SILICON DIODE 1N4148 T&R D1 D3 D4 D5 D6 D7 D8 Q87 Q88
061196 DISC CAP 47PF,20%,N470 50V C146 C152 C157 C159 D9 D10 D21 D22 D25 132224 TRANSISTOR PNP Q1 Q40 Q48 Q49 Q52
061199 DISC CAP 100PF 10% N1500 50V C58 C61 C72 C73 C74 D26 D27 Q69 Q73 Q74 Q76 Q77
C75 C76 C78 C140 C141 070130 ZENER DIODE 8.2V,1/2W D2 132254 TRANSISTOR NPN Q54 Q55 Q56 Q67 Q68
C156 C158 070131 DIODE RECTIFIER D11 D12 D13 D14 D15 Q71 Q85 Q86
061248 DISC CAP .1MF,25V,Y5T C32 C33 C55 D16 D23 D24 132255 TRANSISTOR PNP Q2 Q51 Q53 Q65 Q70
061268 MONO CAP .1UF,50V,Z5U C62 C63 C64 C65 C66 070139 RECTIFIER BRIDGE MC1000 D28 Q72
C67 C68 C69 C70 C71 087050 REED RELAY FORM 1A,5V,500 OHMS K2 K3 K4 K5 K6 K7 K8 132261 TRANSISTOR PNP Q18 Q82
C161 C162 C171 C172 K9 K10 K11 K12 K13 132262 TRANSISTOR NPN Q17 Q84
061273 220PF 5% 100V NPO C173 C174 C175 K16 K17 K18 K20 133028 IC OPERATIONAL AMPLIFIER IC1 IC3
064254 M POLY FILM CAP .1MF,10%,100V C129 087057 RELAY K1 K21 133067 NE5534AN OP AMP LOW NOISE IC16 IC17
064267 M. POLYESTER CAP .22MF,400V C145 087069 POWER RELAY TV5 24V K24 133108 IC +5V REGULATOR IC5
064312 CAP M POLY .01UF 5% 63VDC C165 C167 087072 RELAY 24V TV8/VDE CERTIFIED K22 K23 133153 IC REGULATOR -15V IC6
064318 CAP M POLY .033UF 5% 63/100VDC C166 C168 089089 FUSE 2A SLO-BLO 5X20 F1 133154 IC REGULATOR 15V IC7
064364 CAP POLYPROP .047MF 10% 250V C47 C144 117215 4-PIN CONNECTOR J3 J8 133175 IC AND 2 INPUT X 4 IC14
066269 CAP ELECT 1UF 10% 50V C115 C116 117219 MALE CONN 10 POS J1 133180 LB1720 8 LN DRIVER ARRAY IC10 IC13
066309 CAP ELECT 1000UF 10V C132 117244 FRICTION LK CONN 9POS MALE J6 J7 133186 IC SHFT REG SER-PAR IC9 IC11 IC12
066330 CAP ELECT 220UF 16V SHORT CAN C163 C164 117279 11-POS. MALE CONN. J2 133260 DUAL OPERATIONAL AMPLIFIER IC2 IC4 IC15
066344 CAP ELECT 100UF 25V C133 C134 117404 HEADER 2-PIN 0.156 J4 J5 133360 OCTAL DAR TRANS ARRAY W/DIODE IC8
066360 CAP ELECT 3300UF 35V C125 C127 C128 117436 PJ261G PHON JACK, GOLD J23 134389 TRIM POT 100K,10%,3/8SQ. R237 R238
066361 CAP ELECT 1000UF 20% 35V C126 117455 PHONO JACK 8P, GOLD PLATED J21 J22 137042 FLAMEPROOF RES 47 OHM 5% 1/4W R56 R60
066445 ELECT CAP 10MF, 50V AMMO PACK C30 C85 C86 C87 C88 117494 MINI JACK J28 141165 RES CF 10 5% 1/2W R77 R79 R119 R230
C89 C90 C91 C93 C94 117549 HEADPHONE JACK DUAL BLACK 1/8 J24 J25 J26 J27 R231 R232
C95 C96 C97 C98 C99 117708 FASTON BLADE W/FEET J10 J11 J12 J13 J14 J15 144053 RES MF 10K 1% 1/4W R122 R134 R171 R217
C100 C102 C103 C104 J16 J17 J18 J19 J2 R218
C105 C106 C115 C117 117712 FASTON BLADE .110 J20 144071 METAL FILM RES 365 OHM 1% 1/4W R265 R266 R267 R268
C118 C123 C124 C153 117717 MTA-156 HEADER 8PIN J9 R269 R270 R271 R272
C154 C177 122297 CHOKE OUTPUT .65UH L2 L3 144086 METAL FILM RES 475 OHM 1% 1/4W R45 R167 R168 R187
066446 ELECT CAP 47MF, 35V AMMO PACK C92 C101 132172 TRANSISTOR SI PNP MPSA55 Q50 144090 METAL FILM RES 1K 1% 1/4W R36 R164 R170 R184
066447 ELECT CAP 100MF 16V AMMO PACK C22 C40 C119 C120 132193 TRANSISTOR J.F.E.T. 2N4392 Q62 Q64 R241 R242 R249 R255
C121 R262 R263 R264
144095 RES MF 3.32K 1% 1/4W R41 R55 R188 R193
25
26
PARTS LIST con't
049195 CONTROL 133260 DUAL OPERATIONAL AMPLIFIER IC1 IC2 IC3 IC4
144097 METAL FILM RES 4.75K 1% 1/4W R46 R86 R177 R222 058153 INCANDESCENT LAMP 14V 100MA DS13 DS14 DS15 DS16 134457 POT, EQUAL R33 R34
R227 R233 R234 DS17 DS18 134464 POTENTIOMETER BALANCE 2KOHM R32
144107 METAL FILM RES 40.2K 1% 1/4W R161 R192 061268 MONO CAP .1UF,50V,Z5U C3 C5 C6 C7 C10 134490 POTENTIOMETER 50KAX2 R1
144108 RES MF 47.5K 1% 1/4W R29 R62 R65 R66 R69 061273 220PF 5% 100V NPO C8 C9 144015 METAL FILM RES 33.2K 1% 1/4W R23 R25
R175 R181 R182 R247 061277 MONO CAP 0.1MF 20% 50V C1 144053 RES MF 10K 1% 1/4W R9 R27
R251 066254 CAP ELECT 220UF 50V 20% C2 144086 METAL FILM RES 475 OHM 1% 1/4W R14 R28
144113 RES MF 100K 1% 1/4W R100 R162 R196 R228 066330 CAP ELECT 220UF 16V SHORT CAN C4 144090 METAL FILM RES 1K 1% 1/4W R6 R11 R13 R17
144119 METAL FILM RES 332K 1% 1/4W R221 R226 070093 LED LAMP RED DS1 DS2 DS3 DS4 DS5 144095 RES MF 3.32K 1% 1/4W R21 R22
144125 METAL FILM RES 150K 2% 1/4W R169 R190 DS6 DS7 DS8 DS9 DS10 144107 METAL FILM RES 40.2K 1% 1/4W R39 R40
144127 METAL FILM RES 95.3K 1% 1/4W R248 R257 DS11 DS12 144113 RES MF 100K 1% 1/4W R12 R15 R16 R29 R36
144141 METAL FILM RES 27.4K 1% 1/4W R219 R223 117216 MALE CONN 5-PIN 0.1 POST ASSY J4 R38
144154 RES MF 12.1K 1% 1/4W R128 R172 117279 11-POS. MALE CONN. J1 144157 METAL FILM RES 10 OHMS 1% 1/4W R8 R10
144160 METAL FILM RES 22.1OHM 1% 1/4W R152 R156 117462 PHON JACK 1 1/8" STEREO VER J3 144160 METAL FILM RES 22.1OH 1% 1/4W R2 R26
144172 RES MF 221 OHMS 1% 1/4W R51 R53 R145 R146 121031 IR SENSOR 38KHZ MT1 144195 MF RES, 681 OHM 1% 1/4W R5 R20
R160 R186 R239 R240 133175 IC AND 2 INPUT X 4 IC1 144196 METAL FILM RES 100 OHM 1% 1/4W R35 R37
144187 METAL FILM RES 22.1K 1% 1/4W R104 R105 133186 IC SHFT REG SER-PAR IC3 IC4 144298 MF 2.21K 1% 1/4W R30 R31
144191 RESISTOR MF 1.21K 1% 1/4W R38 R101 R159 R173 133191 IC DC MOTOR DRIVER IC2 144304 MF 2.74K 1% 1/4W R3 R18 R19 R24
144196 METAL FILM RES 100 OHM 1% 1/4W R67 R68 R136 R137 133241 IC MICROPRCSSR RESET POS IC6 144364 RES MF 475K 1% 1/4W R4 R7
R138 R139 R140 R141 133394 PROGRAMMED DEVICE
R142 R144 R150 144053 RES MF 10K 1% 1/4W R5 R16
144210 RES MF 7.5K 1% 1/4W CRB1/4FX R245 R253 144090 METAL FILM RES 1K 1% 1/4W R14 R15
144220 95.3 OHMS 1% 1/4W MF R246 R256 144113 RES MF 100K 1% 1/4W R2
144225 MF RES, 30K OHM 1% 1/4W R147 R148 R258 R259 144157 METAL FILM RES:10 OHMS 1% 1/4W R4
144262 RES NETWORK, 2X220K, ISO R1 R2 R3 R4 R5 R6 R7 144196 METAL FILM RES 100 OHM 1% 1/4W R1
R154 R243 144290 RES NETWORK 3 X 10K BUSSED R6
144264 METAL FILM RES 10M 1% 1/4W R220 R224 144338 RES MF 324 OHM 1% 1/4W R7 R8 R9 R10 R11 R12
144265 METAL FILM RES 2.21M 1/4W R225 R229 R13
144273 RESISTOR MF 182 OHM 1/4W 1% R157 R205 144378 RES MF 2.21 OHM 1/4W 1% R19
144338 RES MF 324 OHM 1% 1/4W R163 R194 144444 METAL FILM RES 75 1% 1/4W R3
144378 RES MF 2.21 OHM 1/4W 1% R250 R252 150058 TACT SWITCH S1 S2 S3 S4 S5 S6 S7 S8
144440 MF RES 14.3K 1% 1/4W R50 R165 S9 S10 S11S12
144441 METAL FILM RES 274K 1% 1/4W R52 R158 R176 178139 IC SOCKET 24-PIN IC5
R178 R179 R195 180039 CERAM RESON 6.0MHZ W/CAP Y1
144442 METAL FILM RES 47.5 1% 1/4W R244 R254
144443 METAL FILM RES 681K 1% 1/4W R30 R37 R83 R166 R174 049235 LAMP
148059 SLIDE SWITCH S1 S2 058120 LAMP 14V #7373 DS1 DS2 DS3
178159 FUSE HOLDER 5X20MM PCB MOUNT F1 117240 4 PIN RT. ANGLE J1
117274 CONN. 2 POS. R-ANGLE J2
049194 HEATSINK
061023 DISC CAP 100PF 10% N1500 C7 C8 049236 POWER GUARD
061159 CERAMIC CAP .01MF +80-20% 50V C9 C16 058133 AMBER LED DS1 DS2
061248 DISC CAP .1MF,25V,Y5T C3 C5 058153 INCANDESCENT LAMP 14V 100MA DS3 DS4
064363 CAP POLYPROP 0.15MF 10% 250VDC C10 117215 4-PIN CONNECTOR J2 J3 J4
066446 ELECT CAP 47MF, 35V AMMO PACK C1 C2 117216 MALE CONN 5-PIN 0.1 POST ASSY J1
070047 SILICON DIODE 1N4148 T&R D1 D2 D3 D4 D5
070133 DIODE 200V,6A D6 D7 049268 TONE
117213 2-PIN MALE CONNECTOR J3 061191 DISC CAP 22PF,10%,NPO 50V C3 C4
117244 FRICTION LK CONN 9POS MALE J1 061196 DISC CAP 47PF,20%,N470 50V C16 C17
117404 HEADER 2-PIN 0.156 J2 061256 M.CAP 470PF,5%,100V C26 C27 C38 C39
132223 TRANSISTOR NPN MPS4124 2K/REEL Q1 061260 MONOLYTHIC, 220PF C1 C2
132224 TRANSISTOR PNP Q2 061268 MONO CAP .1UF,50V,Z5U C28 C30 C31 C33 C36
132261 TRANSISTOR PNP Q7 C37
132262 TRANSISTOR NPN Q6 064254 M POLY FILM CAP .1MF,10%,100V C5 C6
134390 TRIM POT 200 OHM 20% HORIZ AD R13 064318 CAP M POLY .033UF 5% 63/100VDC C18 C19 C20 C21
137093 MET OX 680 5% .5W R2 R9 064329 CAP M POLY .22UF 5% 63VDC C40 C41 C42 C43
137094 MET OX 1.8K 5% .5W R6 R11 066330 CAP ELECT 220UF 16V SHORT CAN C44 C45
137095 MET OX 430 5% .5W R7 066345 CAP ELECT 22UF 50V C9 C12
137096 MET OX 47 5% .5W R12 066378 CAP ELECT 47UF 16V BP C15
139177 WIREWOUND RES 0.5 OHM 5W 5% R31 R32 R33 R34 R35 066445 ELECT CAP 10MF, 50V AMMO PACK C7 C10 C11 C14 C34
R36 R37 R38 C35
144053 RES MF 10K 1% 1/4W R3 R10 066446 ELECT CAP 47MF, 35V AMMO PACK C22 C2324 C25
144172 RES MF 221 OHMS 1% 1/4W R1 R8 070047 SILICON DIODE 1N4148 T&R D1 D2
144279 THERMISTOR 100 OHM RT1 087050 REED RELAY FORM 1A,5V,500 OHMS K1 K2 K3
144378 RES MF 2.21 OHM 1/4W 1% R30 117219 MALE CONN 10 POS J1
117707 CONNECTOR MALE 6 POS RT ANGLE J2
27 280
MA6500
EXPLODED VIEW
29 30
EXPLODED VIEW PARTS LIST NOTES
Ref. Part Description
No. No.
1 016404 FRONT PANEL GLASS 53 101059 SM 6 X 5/8 PHIL PAN TYPE A
2 004899 EXTRUSION BRACKET 54 114119 TRANSISTOR CLIP 214
3 018612 END CAP 55 114118 TRANSISTOR CLIP 218
4 101042 TS 4-40 X 1/2 SLOT FILLISTER 56 112087 PCB SPACER 1/4"
5 171260 C/A INPUT/POWER SWITCH 57 084194 ISOSTRATE
6 017531 PUSHBUTTON ASSY RED 58 018616 AMPLIFIER HEATSINK 4 INCH
7 017517 PUSHBUTTON ASSY 59 017160 MOUNTING TAB W/.140 DIA MTG
8 017736 HEADPHONE BEZEL 60 049193 INPUT/DRIVER PCB ASSY
9 078033 O-RING 61 102014 MACH NUT 6-32 W/LOCK
10 090258 KNOB 25mm INDEX 62 110009 NUT M5 X 0.8 BRASS W/GOLD PLATE
11 104073 FELT W MPI-4 1/4 X 5/8 63 104130 LW #10 SPLIT PHOS/BRONZE
12 018605 BOTTOM EXTRUSION 64 104148 FLAT WASHER BRASS
13 101172 TCS 6-32 X 1/4 PHIL FLAT U/C 65 004800 OUTPUT PLATE
14 101054 TS 6-32 X 1/4 PHIL PAN TAPTITE 66 100250 SEMS 6-32 X 1/4 PHIL PAN
15 018587 TOP EXTRUSION 67 102020 MACH NUT 6-32 SELF-LOCK
16 094350 SENSOR GASKET 68 104016 LK WASHER 1/2 X .630 X .022 INT STAR
17 017764 DISPLAY PLEXIGLAS 69 178122 SOCKET FUSEHOLDER UL/CSA
18 022314 FISHPAPER SHEILD 70 117487 MC1000 AC LINE RECEPTACLE
19 017363 PLEXIGLAS FILTER LIGHT BLUE 71 117369 COAX RECEPTACLE GOLD TYPE F
20 004966 SUBPANEL 72 101197 HI/LO 4-32 X 3/8 PH ROUND BLACK
21 049195 CONTROL PCB ASSY 73 084124 DUAL BINDING POST
22 129284 TONE PCB ASSY 74 084112 GROUND POST (GOLD) 4300
23 100275 MS 6-32 X 1/2 PHIL BLK TRUSS HD 75 004962 REAR PANEL
24 021030 SPACER 6 X 1/4 76 101109 TS 6-32 X 5/16 PHIL PAN
25 078031 GROMMET 77 004798 TOP COVER
26 049236 POWER GUARD DISPLAY ASSY 78 101078 TS 8-32 X 5/16 PHIL PAN
27 021094 SPACER 4 X 1/4 79 017706 TERMINAL COVER
28 102001 KEP NUT 4-40 CADMIUM PLATE 80 100072 LOCK WASHER 1/4 X .396 INT STAR
29 124074 MC202 METER 81 100126 MS 1/4-20 X 5/8 PHIL PAN BLACK
30 092341 FILTER AZURE BLUE 82 094017 FOAM TAPE 1/4 X 1/4
31 092342 FILTER PALE BLUE
32 017447 PLASTIC LIGHT BOX
33 049235 LAMP PCB ASSY
34 114072 PLASTIC RIVET
35 159310 POWER TRANSFORMER
36 102007 MACH NUT 1/4-20 W/LOCK
37 004964 TRAY
38 102003 MACH NUT 6-32 W/LOCK
39 004965 CHASSIS
40 017218 PLASTIC FEET - BLACK
41 104080 FLAT WASHER #10 CLEAR ZINC
42 100159 MS 10-32 X 3/4 PHIL PAN ZINC
43 101176 TCS 6-32 X 1/2 PH PAN BLK TYPE F
44 074091 AC TERMINAL BLOCK
45 104001 FLAT STEEL WASHER #4 X 9/32 X .025
46 104004 LK WASHER 5 X .255 INT STAR
47 102022 MN 4-40 3/16 X 1/16
48 112038 STL SPACER 4 X 3/8 L NICKEL PLT
49 021038 SPACER #6 X 3/8
50 084135 THERMAL PAD MC7150
51 106007 SPRING CLIP LATCH TYPE
52 049194 HEATSINK PCB ASSY
31 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