McIntosh MC206 User manual

SERVICE MANUAL
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 3
BlockDiagram ........................................................... 4
Interconnection Diagram ...................................... 5 - 8
Multi-channel Schematic and PCB ............................. 9
Heatsink Schematic and PCB.............................. 10 - 12
Driver Schematic and PCB ................................. 13 - 15
Capacitor Schematic and PCB ........................... 15 - 16
Meter Schematic and PCB ................................. 17 - 21
Parts List ............................................................ 22 - 24
ExplodedViews and Parts Lists .......................... 25 - 28
Repacking Instruction .............................................. 29
CONTENTS
POWER AMPLIFIER

PERFORMANCE SPECIFICATIONS
2
1. The heavy lines on the schematic 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 (10 megaohm) voltmeter must be used.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
4. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
5. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
NOTES
PowerOutput
Minimum sine wave continuous average power output per
channel, all channels operating is:
200 watts into 4 ohm load
120 watts into 8 ohm load
RatedPowerBand
20Hzto20,000Hz
TotalHarmonicDistortion
MaximumTotal Harmonic Distortion at any power
level from 250 milliwatts to rated power output is:
0.005%for 4 or 8ohm loads
DynamicHeadroom
1.6dB
FrequencyResponse
+0,-0.25dBfrom 20Hz to 20,000Hz
+0,-3dBfrom10Hzto100,000Hz
Sensitivity
1 volt
A-Weighted SignalTo NoiseRatio
92dB (113dB below rated output)
IntermodulationDistortion
MaximumIntermodulation Distortion if instan-
taneous peak output per channel does not exceed
twice the rated output, for any combination of
frequenciesfrom 20Hz to20,000Hz, withall
channels operating is:
0.005%for 4 or 8 ohm loads
InputImpedance
10,000ohms
WideBandDampingFactor
100 at 4 ohms
200 at 8 ohms
PowerRequirements
100Volts,50/60Hzat 13.2 amps
110Volts,50/60Hzat 12.0amps
120Volts,50/60Hzat 11.0amps
220Volts,50/60Hz at 6.0amps
230Volts,50/60Hz at 6.0amps
240Volts,50/60Hz at 6.0amps
Note: Refer to the rear panel of the MC206 for the
correct voltage.
Dimensions
FrontPanel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches
(18.10cm) high. Depth behind front mounting panel is 18
inches (45.72cm). Clearance required in front of the Front
Panel is 1 inch (2.54cm) for knobs.
Weight
57 pounds (25.9kg) net, 76 pounds (34.5kg) in shipping
carton

3
MC206
REAR PANEL
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED

4
BLOCK DIAGRAM

5 6
INTERCONNECT
MC206
87

91210
MULTI-CHANNEL 048551B
11
2
HEATSINK 049552
3A
B
C

13 14
MC206
DRIVER 049553
4A
B
C

15 16
DRIVER 049553
4A
B
C
CAPACITOR 049551
5

17
MC206
METER 049554
6
18 19 20

METER 049554
6
PARTS LIST
INTERCONNECT
C1 .22uFCAPACITOR 05200500
D1 BRIDGERECTIFIER 07013900
F1 15A250VFUSE 08904200
M1 M2 M3 PANELMETER 12406400
RT1RT2 THERMISTOR 05200800
S1 METERSWITCH 14625000
S2 POWERSWITCH 14624300
T1 TRANSFORMER 04898000
TB1 TERMINALBLOCK 07409100
TB2TB3TB4TB5TB6TB7 SPEAKERTERMINAL 08412400
049551BMULTI-CHANNELPCB
J1- CONND25-PIN 11750100
J2-J3-J4-J16-J18-J19- CONN4PIN 11721500
J20-J21- JACKMINI 11749400
R9 RESMF1001%1/4W 14419600
R11R12 RESMF1K1%1/4W 14409000
049552HEATSINKPCB
C1C2C10C11 CAPELECT47UF35V 06644600
C3 C15 CAP MO NO .1UF 50 V 20% Z5U 06130500
C4 CAPPOLYPROP0.15UF10%250VDC 06436300
C7C8C12C13 CAPMONO100PF100V10%NPO 06130000
C9C16C17C18 CAPMONO.01UF50V 20% X7R 06130400
D1D2D3D4D5D8D9D10D11D12 DIODESILICON 07004700
D6D7D13D14 DIODERECTIFIER 07013100
J1-J2- CONNMALE9POSFRICTIONLOCK 11724400
J3- CONNHEADER2PIN0.156 11740400
J10J11 CONNMALE2PIN 11721300
Q1Q12Q5Q14 TRANSISTOR NPN 13222300
Q2Q13 TRANSISTORPNP 13222400
Q3Q18 TRANSISTORNPNPOWER 13226800
Q4Q17 TRANSISTORPNPPOWER 13226700
Q6Q16 TRANSISTORNPN 13226200
Q7Q15 TRANSISTORPNP 13226100
Q8Q10Q21Q22Q25Q26 TRANSISTORPNPPOWER 13223900
Q9Q11Q19Q20Q23Q24 TRANSISTORNPNPOWER 13223800
R1R8R20R27 RESMF2211%1/4W 14417200
R2R9R22R24 RESMETOX6805%.5W 13709300
R3R10R21R25 RESMF15K1%1/4W 14441200
R6R11R19R26 RESMETOX1.8K5%.5W 13709400
R7R23 RESMETOX4305%.5W 13709500
R12R18 RESMETOX475%.5W 13709600
R13R28 POTTRIM200OHM20%HORIZAD 13439000
R39 RESMF2.21OHM1/4W 1% 14437800
R40R41R42R43R44R45 RES WW DUAL.47OHM 5% 5W 13919900
RT1 THERMISTOR100 14427900
049553DRIVERPCB
C1C15C32C33 CAP MONO .1UF50V20% Z5U 06130500
C22C44 CAP ELECT 100UF 25V 06644700
C27C28 CAPMONO100PF100V10%NPO 06130000
C29C30 CAP ELECT 47UF 35V 06644600
C31C39 CAPELECT0.47UF50V 20% 06624400
C35C36C37C38C50C51 C200 CAP ELECT 10UF100VDC 06646200
C40 CAP ELECT 220UF 50V 20% 06625400
C47C48 CAPPOLYPROP.047UF10%250VDC 06436400
C55 CAP MONO.01UF50V20%X7R 06130400
IC1 ICDUALOPERATIONALAMPLIFIER 13326000
J1 JACKPHONOGOLDPJ261G 11743600
J5-J6- CONNMALE9POSFRICTIONLOCK 11724400
J7- CONN8POSMALEFRICTIONLOCK 11727500
J8-J9-J10- CONNHEADER2PIN0.156 11740400
J11- CONN4PIN 11721500
K1 RELAY24VDC5A277VAC 08705700
L1L2 CHOKEOUTPUT.65UH 12229700
LD1LD2 LDRNETWORKVTL5C9 14417900
Q1Q7Q14Q25Q26Q27Q28Q39 TRANSISTORPNP 13222400
Q2Q10Q11Q23Q24Q38 TRANSISTORPNP120V 13225500
Q5Q8Q9Q19Q20Q29Q30Q34 TRANSISTORNPN 13225400
Q6Q12Q13Q15Q16Q35Q42Q44 TRANSISTORNPN 13222300
Q17Q21 TRANSISTORNPN 13226200
Q18Q22 TRANSISTORPNP 13226100
Q40Q43 TRANSISTORPNP 13222400
R1R2 POT GAIN CONTROL 10K OHM 13448600
R19R27R29R84R94 R122 RES MF 47.5K 1% 1/4W 14410800
R20R28R30R31R37R65 R66 R91 RES MF 681K 1% 1/4W 14444300
R22R34R45R64R83 RES MF 10K1%1/4W 14405300
R36R97 RES5111%1/4W 14412300
R38R89R92R101 RESMF1.21K1%1/4W 14419100
R41R55R96R98 RESMF3.32K1%1/4W 14409500
R44R49 RESMF1.1K1%1/4W 14409100
R46R47R86 RESMF4.75K1%1/4W 14409700
R48R61R67R68R123 RES MF 100 1% 1/4W 14419600
R50R87 RESMF14.7K1%1/4W 14414900
R51R53R76R99 RESMF2211%1/4W 14417200
R52R75R105R108 RESMF267K1%1/4W 14411800
R56R60 RESFP22OHM1/4W5% 13703300
R59 RESMF2.21OHM1/4W1% 14437800
R62R69R93R104 RESMF22.1K1%1/4W 14418700
R77R79R80R82R113R114 R119 R120 RES CF 10 5% 1/2W 14116500
R118R121 RESMF5.62OHM1%1/4W 14416800
049551CAPACITORPCB
C3 CAPELECT22UF100V 06650600
C4 CAPMPOLY.22UF5%63VDC 06432900
C5 CAPELECT10UF50V 06644500
D1 DIODERECTIFIER 07013100
IC1 ICNANDSCHMIT2-INX4 13319200
J4-J16- CONN 4 PIN 11721500
J5- CONNMALE7PIN 11721700
J8-J9-J10-J11-J12-J13- CONNHEADER2PIN0.156 11740400
J14J15J16J17J23 BLADEFASTON 1/4 INCH 11734200
J22- CONNMALE3POSMTS100NORMAL 11721400
K1 RELAY48VDC 08704900
Q1 TRIACOPTOCOUPLER 13102400
R1 RESMF1K1%1/4W 14409000
R2R4R10 RESMF33.2K1%1/4W 14401500
R3 RESMF1M1/4W 14426900
R5 RESMF1001%1/4W 14419600
R7 RESWW1K5W10% 13912100
049554METERPCB
C7C200C201C205C206 C207 C208 C218 CAP MONO .1UF 50V 20%Z5U 06130500
C9C217 CAP ELECT 3300UF 35V 06650900
C11 CAPELECT22UF50V 06634500
C204C215C216C219C220 CAP ELECT 100UF 25V 06644700
C209C210C211C212C213 C214 CAP ELECT 2.2UF 50V 06651100
D14D46 DIODERECTIFIER 07013100
D15D16D17D18D19D20D21D22 D23 DIODE SILICON 07004700
D24D25D26D27D28D29D30D31 D32 DIODE SILICON 07004700
D33D34D35D36D37D38D47D48 D49 DIODE SILICON 07004700
D40D41D42D43D44D45 LEDBAR RED 05813900
D50D51D52 DIODEZENER16V5%500MW 07011400
D53D54D55 DIODESILICON 07004700
DS7DS8DS9DS10DS11DS12 LEDAMBER 05813300
DS20 LEDREDHIGHEFFICIENCY 05814800
DS21DS22DS23DS24DS25DS26DS27 LAMP14V 05812000
DS27DS28DS29DS50 SOCKETLAMP0.125PINS.110HI 17816200
DS28DS29DS31DS32DS33DS50 LAMP14V 05812000
F1 HOLDERFUSE5X20MMPCBMOUNT 17815900
IC1IC2 IC3 IC QUAD OPAMPNJM4741D 13331200
IC4IC5 IC6 IC QUAD ANALOG SW 13311700
IC20 IC REGULATOR+5 VOLT 13309300
IC21 IC REGULATOR -12V 13315500
IC22 ICREGULATOR 12V 13315600
J1-J2-J3- CONN8POSMALEFRICTIONLOCK 11727500
J4- CONNMALE3POSMTS100NORMAL 11721400
J6-J8-J9-J17-J18- CONN4PIN 11721500
J10-J11- CONN13POS 11729800
J12-J13-J14- HEADER2PIN.100 11769000
J16- CONNMALE5PIN0.1POSTASSY 11721600
J18J19 BLADEFASTON1/4 INCH 11734200
K1 RELAY24VDC5A277VAC 08705700
Q8Q10Q11Q12Q13Q14Q15Q22 TRANSISTORNPN 13222300
Q25Q35Q57Q58Q59Q60Q61Q62 TRANSISTORPNP 13222400
Q32Q33 TRANSISTORPOWER N-CHN ENHANCE 13224200
Q34Q36Q37Q38Q39Q40Q41Q50 TRANSISTORNPN 13222300
Q51Q52Q53Q54Q55Q56 TRANSISTORNPN 13222300
R2R3R4 R5R6R7 RESMF6811%1/4W 14419500
R30 RESMF681K1%1/4W 14444300
R98R148R166R169R172 R174 R181 RES MF 150K 1% 1/4W 14441900
R100R101R138R149R162 R163 RES MF 20.0 1/4W 14417400
R102R106R110R114R129 R144 R202 RES MF 100K 1% 1/4W 14411300
R103R151R164R167R170 R176 RES MF 5.62K OHM 1% 1/4W 14444700
R104R119R132R133R135 R136 RES MF 15K 1% 1/4W 14441200
R105R127R137 RESMF4.75M1/4W1% 14437900
R107R108R109R118R120 R122 R141 RES MF 3.32K 1% 1/4W 14409500
R111R116R134R145R160 R161 R192 RES MF 178K 1% 1/4W 14442000
R112R117R121R124R131 R140 R171 RES MF 10K 1% 1/4W 14405300
R115R126R128R177R178 RES 26.7K 1% 1/4W 14410500
R123R146R156R195 RESMF2211%1/4W 14417200
R125R130R139 RESMF90.9K1%1/4W 14417000
R142R143R194 RESMF3.32K1%1/4W 14409500
R175R199 RESMF10K1%1/4W 14405300
R180 RESMF18.2K1%1/4W 14418100
R185R186R187 POTTRIMMER5KOHM20% 13438700
R188R193 RESMF3.16K1%1/4W 14419900
R189 RESMF7.5K1%1/4W 14421000
R190 RESMF47.5K1%1/4W 14410800
R191R197 RESMF12.1K1%1/4W 14415400
R196R200R201R203R204 R205 R206 RES MF 178K 1% 1/4W 14442000
R198 RESMF5.11K1%1/4W 14408300
R207R208 RESMF178K1%1/4W 14442000
Reference No. Description PartNo.
21 22 23 24

25 26
MC206 EXPLODED VIEW
MC206

27 28
MC206 EXPLODEDVIEW PARTS LIST
1 016446 GLASS
2 049319 KNOB ASSY
3 104017 WASHER FILT BLK 3/4 X1/4 X 1/16
4 004801 BRACKET EXTRUSION
5 018612 END CAP 7”
6 101042 SCREW TS 4-40 X 1/2 SLOT FILLISTER
7 094360 TAPE FOAM 1/2 X 1/2
8 018588 EXTRUSION BOTTOM
9 101172 SCREW TC 6-32 X 1/4 PH FL U/C
10 018587 EXTRUSION TOP
11 094016 TAPE FOAM 1/4 X 1/8
12 017855 PLEXIGLAS
13 092413 ACETATE FILTER BLUE
14 005001 SUB PANEL
15 021159 BUSHING SWITCH
16 146243 POWER SWITCH (W/LOCKWASHER)
17 146250 METER SWITCH (W/LOCKWASHER)
18 101054 SCREW TAPTITE 6-32 X 1/4 PH PAN
19 094017 TAPE FOAM 1/4 X 1/4
20 049554 METER PCB ASSY
21 112086 SPACER NYLON
22 077031 SLEEVING FIBERGLAS #2
23 102001 NUT KEP 4-40 CADMIUM PLATE
24 112051 SPACER 1/8” NYLON
25 124080 METER
26 092341 FILTER AZURE BLUE
27 092342 FILTER PALE BLUE
28 017447 LIGHT BOX PLASTIC
29 114072 RIVET NYLON POP-IN
30 004798 TOP COVER
31 101078 SCREW TAP 8-32 X 5/16 PH PAN BLK
32 021094 SPACER #4 X 1/4
33 004791 TRAY
34 101163 SCREW TC 8-32 X 1/4 PH PN TYPE F
35 106007 SPRING CLIP LATCH TYPE
36 084135 PAD THERMAL
37 104005 WASHER FLAT STEEL6 X 3/8 X .032
38 102045 NUT KEP 6-32 SPECIAL
39 070139 DIODE BRIDGE RECTIFIER
40 074091 TERMINAL BLOCK AC
41 102022 NUT MACH 4-40 X 3/16 X 1/16
42 104004 WASHER LOCK 5 X .255 INT STAR
43 104001 WASHER FLAT STEEL4 X 9/32 X .025
44 003855 CLAMP CAPACITOR
45 100118 SCREW MACH 6-32 X 1/2 PH PN
46 066480 CAP ELECT
47 049551 CAPACITOR PCB ASSY
48 100188 SCREW MACH SEMS 10-32 X 3/8
49 048980 TRANSFORMER ASSY
50 098113 DIAL CORD
51 018671 HEATSINK
52 084183 ISOSTRATE
53 112087 SPACER PCB 1/4”
54 101202 SCREW SM 6-20 X 3/4 PH PN TYPE B
55 101059 SCREW 6 X 5/8 PH PN TYPE A
56 114119 CLIP TRANSISTOR 214
57 114118 CLIP TRANSISTOR 218
58 049552 HEATSINK PCB ASSY
59 049553 DRIVER PCB ASSY
60 022185 SPACER #6 X 1/2
61 112088 SUPPORT CIRCUIT BOARD
62 005156 REAR PANEL
63 078122 HOLDER FUSE SOCKET UL/CSA
64 112032 SPACER BLACK NYLON
65 104016 WASHER INT STAR .5 X .630 X .022
66 117487 RECEPTACLE AC LINE
67 084124 POST DUAL BINDING
68 004800 PLATE OUTPUT
69 104130 WASHER LOCK #10 SPLT PHOS/BRNZ
70 104148 WASHER PLAT BRASS
71 110009 NUT M5 X 0.8 BRASS W/GOLD PLATE
72 102020 NUT MACH 6-32 SELF-LOCK
73 112015 STANDOFF
74 104142 WASHER LOCK 2.5mm INT STAR ZINC
75 101114 SCREW SM 4-24 X 1/2 PH PN TYPE A
76 100271 SCREW MACH SEMS 6-32 X 1/4 PH PN
77 101176 SCREW TC 6-32 X PH PN TYPE F
78 100120 SCREW MACH 10-32 X 1/4 PH PN ZINC
79 104067 WASHER LOCK #10 INT STAR
80 005175 CHASSIS
81 017218 FOOT PLASTIC BLACK
82 104080 WASHER FLAT #10 CLEAR ZINC
83 100159 SCREW 10-32 X 3/4 PH PN BLK
84 101109 SCREW TAP 6-32 X 5/16 PH PN BLK
Ref
No. Description
Part
No.

29
MC206
REPACKING INSTRUCTION

The continuous improvement of it’s products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without 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 040818
POWER AMPLIFIER
SERVICE MANUAL