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POWER AMPLIFIER
CONTENTS
Performance Specifications ........................................ 2 Meter Schematic and PCB ................................. 13 - 19
Notes ......................................................................... 2 Power Guard Lamp Schematic and PCB .................. 16
Rear Panel .................................................................. 3 Meter Light Schematic and PCB ............................... 17
Section Location ........................................................ 3 Panel Lamp Schematic and PCB ............................... 18
Block Diagram ...................................................... 5 - 6 Parts List ............................................................ 19 - 20
Interconnection Diagram ...................................... 7 - 8 Exploded View and Parts List ............................. 21 - 24
Heatsink Schematic and PCB .............................. 9 - 10 Repacking Instructions ............................................. 25
Driver Schematic and PCB ................................ 11 - 12
SERVICE MANUAL
PERFORMANCE SPECIFICATIONS
Power Output Stereo Signal To Noise Ratio (A Weighted)
200 watts into 2, 4 or 8 ohm loads is the minimum sine 110dB below rated output
wave continuous average power output per channel
with both channels operating. Sensitivity
1.7 Volts Unbalanced Input
Power Output Mono Bridged 3.4 Volts Balanced Input
400 watts into 4, 8 or 16 ohm loads is the minimum
sine wave continuous average power output. Input Impedance
10,000 ohms Unbalanced and Balanced
Output Load Impedance
Stereo - 2, 4 or 8 ohms Wide Band Damping Factor
Mono - 4, 8 or 16 ohms Greater than 40
Rated Power Band Power Requirements
20Hz to 20,000Hz 100 Volts, 50/60Hz at 4.8 amps
110 Volts, 50/60Hz at 4.4 amps
Dynamic Headroom 120 Volts, 50/60Hz at 4.0 amps
1.9dB 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, -0.25dB from 20Hz to 20,000Hz Note: Refer to the rear panel of the MC202 for the correct
+0, -3dB from 10Hz to 100,000Hz voltage.
Total Harmonic Distortion Dimensions
0.005% maximum at any power level from 250 Front Panel: 17-1/2 inches (44.45cm) wide, 5-7/16
milliwatts to rated power per channel from 20Hz to inches (13.81cm) high. Depth behind front mounting
20,000Hz, all channels operating. panel is 18 inches (45.72cm). Clearance required in front
of the Front Panel is 1 inch (2.54cm) for knobs.
Intermodulation Distortion
0.005% maximum if instantaneous peak output per Weight
channel does not exceed twice the rated output with all 65 pounds (29.49 kg) net, 83 pounds (37.65 kg) in
channels operating for any combination of frequencies shipping carton.
from 20Hz to 20,000Hz.
NOTES
1. The heavy notes on the schematic denote the primary 4. On PC board drawings, Square pad indicates:
signal path. a. Polarized Capacitors - Positive
b. Diodes - Cathode
2. Unless otherwise noted, all voltages indicated on the c. Others - Pin 1
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz. 5. WARNING
b. All voltages are +/-10% with respect to ground. A Parts marked with the symbol have critical
high impedance (10 megaohm) voltmeter must be used. characteristics. Use only replacement parts recom-
mended by the manufacturer.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
2
MC202
REAR PANEL
SECTION LOCATIONS
3
NOTES
4
MC202
BLOCK DIAGRAM
5 6
INTERCONNECT
7 8
MC202
2A 2B HEATSINK 049346
9 10
3 DRIVER 049353
11 12
MC202
4 METER 049352
13 14
4 METER 049352 5A POWER GUARD LAMP 049354
15 16
MC202
5B METER LIGHT 049354 5D PANEL LAMP 049354
5C METER LIGHT 049354 5E PANEL LAMP 049354
17 18
PARTS LIST
PART NO DESCRIPTION REFERENCE NO
INTERCONNECT
070139 DIODE RECTIFIER D1 132255 TRANSISTOR PNP Q2 Q38 Q48 Q50 Q51 Q54 133192 IC NAND SCHMIT 2-IN X 4 IC4
089104 FUSE 6.3A 250V SLO BLO F1 132285 TRANSISTOR NPN 25C3334C Q17 Q21 133260 DUAL OPERATIONAL AMPLIFIER IC2 IC3
124077 METER MT1 MT2 132286 TRANSISTOR PNP 2SA32IC Q18 Q22 134383 TRIM POT 100K OHM 20% R195 R196
146243 SWITCH S1 S2 133260 DUAL OPERATIONAL AMPLIFIER IC1 IC2 139079 WIRE RES 1.5K 10% 5W R198
049349 POWER TRANSFORMER T1 137042 FLAMEPROOF RES 47 OHM 5% 1/4W R56 R60 139218 2.7 OHM 2W 5% WW RESISTOR FP R197
049350 OUTPUT TRANSFORMER T2 139005 WIRE RES 2 OHMS 10% 5W R177 R179 144081 RES MF 68.1K 1% 1/4W R152 R192
074091 AC TERM BLOCK TB1 139119 WIRE RES 4 OHMS 5% 5W R176 R178 144091 RES MF 1.1K 1% 1/4W R2 R3 R167 R172 R191
144053 RES MF 10K 1% 1/4W R45 R64 R131 R136 144106 RES 33.2K 1% 1/4W R165 R166
049346 HEATSINK PCB 144086 RES MF 475 1% 1/4W R164 R171 144120 RES MF 402K 1% 1/4W R199
061300 MONO CAP 100PF 100V 5% NPO T&R C7 C8 144089 RES MF 806 1% 1/4W R38 R89 R92 R101 144128 RES MF 1.5K 1% 1/4W R164
061304 MONO CAP .01UF 50V 5% X 7R T&R C9 C16 144090 RES MF 1K 1% 1/4W R44 R49 144130 RES MF 10.2K 1% 1/4W R171 R189 R190 R194
061305 MONO CAP .1UF 50V 5% Z50 T&R C3 C5 144095 RES MF 3.32K 1% 1/4W R41 R55 R96 R98 R133 R165 R166 144157 RES MF 10 1% 1/4W R138
064363 CAP POLYPROP 0.15MF 10% 250VDC C10 144097 RES MF 4.75K 1% 1/4W R46 R47 R135 R162 144187 RES MF 22.1K 1% 1/4W R177 R184
066446 CAP ELECT 47MF 35V C1 C2 144104 RES MF 20K 1% 1/4W R132 R148 R156 R161 R172 R175 144191 RES MF 1.21K 1% 1/4W R180 R187
070047 SILICON DIODE 1N4148 T&R D1 D2 D3 D4 D5 R182 R183 R184 R185 144196 RES MF 100 1% 1/4W R175 R181 R186
070131 DIODE RECTIFIER D6 D7 144106 RES 33.2K 1% 1/4W R153 R163 144265 RES MF 2.21M 1/4W R178 R182
117213 2-PIN MALE CONNECTOR J4- 144108 RES MF 47.5K 1% 1/4W R19 R27 R29 R94 144379 RES METAL FILM 4.75M 1/4W 1% R183 R188
117217 MALE CONN 7 PIN J1 144112 RES 82.5K 1% 1/4W R154 R155 R167 R168 144406 METAL FILM RES 187K 1% 1/4W R4 R5 R179 R185
117404 HEADER 2-PIN 0.156 J3- 144118 RES MF 267K 1% 1/4W R20 R28 R30 R31 R186 144418 MF RES 121K 1% 1/4W R170 R173
117708 FASTON BLADE W/FEET J2 144154 RES MF 12.1K 1% 1/4W R150 R152 144421 MF RES 221K 1% 1/4W R193
132171 TRANSISTOR NPN Q1 144157 RES MF 10 1% 1/4W R67 R68 144422 MF RES 1.5M 1% 1/4W R174 R200
132172 TRANSISTOR SI PNP MPSA55 Q2 144172 RES MF 221 1% 1/4W R139 R140 R141 R142 R143 R144 178159 FUSE HOLDER 5X20MM PCB MOUNT F1
132285 TRANSISTOR NPN 25C3334C Q6 R145 R146
132286 TRANSISTOR PNP 2SA32IC Q7 144179 LDR NETWORK VTL5C9 LD1 LD2 049354 POWER GUARD LIGHT\METER LIGHT\PANEL LAMP PCB
134390 TRIM POT 200 OHM 20% HORIZ AD R13 144187 RES MF 22.1K 1% 1/4W R157 R169 R170 R173 058120 LAMP 14V #7373 C1 C2 C3 C4 C5 C6 C9 C10
137093 MET OX 680 5% .5W R2 R9 144196 RES MF 100 1% 1/4W R48 R61 R130 C11 C12
137094 MET OX 1.8K 5% .5W R6 R11 144264 RES MF 10M 1% 1/4W R158 R160 058133 AMBER LED DS7 DS8
137095 MET OX 430 5% .5W R7 144299 RES MF 2.1K 1% 1/4W R138 R147 R151 R174 058148 RED LED HIGH EFFICIENCY DS20
137096 MET OX 47 5% .5W R12 144338 RES MF 324 OHM 1% 1/4W R36 R51 R53 R76 R97 R99 R134 117221 MALE CONN 3 POS RT. ANGLE J10-
139177 WIREWOUND RES 0.5 OHM 5W 5% R31 R32 R33 R34 R35 R36 R137 117240 4 PIN RT. ANGLE J1- J2- J3- J4- J5-J6- J7- J8- J9-
144172 RES MF 221 1% 1/4W R1 R8 144364 RES MF 475K 1% 1/4W R180 R181 117242 11 POS. RT ANGLE J13
144279 THERMISTOR 100 RT1 144406 METAL FILM RES 187K 1% 1/4W R37 R52 R75 R91 117274 CONN. 2 POS. R-ANGLE J11- J12-
144378 RES MF 2.21 OHM 1/4W 1% R30 148059 SLIDE SWITCH S1
144412 MF RES 15K 1% 1/4W R3 R10
049352 METER PCB
049353 DRIVER PCB 061305 MONO CAP .1UF 50V 5% Z50 T&R C207 C208 C217 C226 C227
061249 DISC CAP .47UF 50V MONOLITHIC C31 C39 064329 CAP M POLY .22UF 5% 63VDC C244 C245 C246
061298 MONO CAP 22PF 200V 5% NPO T&R C115 C116 C118 C120 064337 CAP M POLY 1MF 5% 63VDC C241 C242
061299 MONO CAP 47PF 200V 5% NPO T&R C117 C119 066390 CAP ELECT 22UF 100V C243
061300 MONO CAP 100PF 100V 5% NPO T&R C27 C28 C100 C101 C102 066445 CAP ELECT 10MF 50V C239 C240 C247
C103 066447 CAP ELECT 100MF 16V C216
061305 MONO CAP .1UF 50V 5% Z50 T&R C32 C33 066504 CAPACITOR ELECT 25000UF 75V C237 C238
064310 CAP MPOLY .0068UF 5% 100/250VDC C105 C106 066509 CAP ELECT 3300UF 35V C235 C236
064363 CAP POLYPROP 0.15MF 10% 250VDC C109 C110 070047 SILICON DIODE 1N4148 T&R D3 D4 D5 D6 D7 D8 D9 D10 D12
064364 CAP POLYPROP .047MF 10% 250V C107 C108 D12 D13 D14 D20
066446 CAP ELECT 47MF 35V C29 C30 070130 ZENER DIODE 8.2V 1/2W D1
066462 CAP ELECT 1OUF 100VDC C35 C36 C37 C38 C104 C111 070131 DIODE RECTIFIER D15 D16 D17
C112 C113 C114 087052 RELAY 8A R1
066507 CAP ELECT 220UF 25V C22 C44 089089 FUSE 2A SLO-BLO 5X20 F1
117215 4-PIN CONNECTOR J3- J4- 117215 4-PIN CONNECTOR J3-
117217 MALE CONN 7 PIN J5- J6- 117217 MALE CONN:7 PIN J2-
117279 11-POS. MALE CONN. J7- 117279 11-POS. MALE CONN. J1- J9-
117436 PJ261G PHON JACK, GOLD J1 117404 HEADER 2-PIN 0.156 J21- J22-
117685 XLR RECEPTACLE FEMALE J2 J8 117708 FASTON BLADE W/FEET J14 J15 J26- J27 J28 J31 J41 J42 J50
117759 STEREO 1/8 HEAD PHONE JACK J15 J16 131021 TRIAC 8A 200V Q9
132222 N. CHANNEL FET Q61 Q62 131022 600V TRIAC DRIVER OPTOCOUPLER Q8
132223 TRANSISTOR NPN MPS4124 2K/REEL Q6 Q35 Q42 Q44 Q45 Q46 132223 TRANSISTOR NPN MPS4124 2K/REEL Q10 Q13 Q14 Q16 Q17 Q18 Q20 Q21
Q47 Q49 Q58 Q22 Q23 Q24
132224 TRANSISTOR PNP Q1 Q3 Q19 Q39 Q40 Q43 Q59 132224 TRANSISTOR PNP Q11
Q60 132226 TRANSISTOR P.CHANNEL JUNC.FET Q12
132254 TRANSISTOR NPN Q5 Q34 Q52 Q53 Q55 Q56 133093 IC REGULATOR +5 VOLT Q3
19 20
MC202
EXPLODED VIEW
21 22
EXPLODED VIEW PARTS LIST
Ref Part Description
No. No.
1 016411 GLASS PANEL 51 102003 MACH NUT 6-32 W/LOCK
2 049320 KNOB ASSEMBLY 52 112103 HEX SPACER 6-32 X 2.375
3 104017 BLK FELT WASHER 53 049353 DRIVER PCB ASSY
4 018611 5" ENDCAP 54 104005 STEEL WASHER: FLAT 6 X 3/8 X .032
5 101042 TS 4-40 X 1/2 SLOT FILLISTER 55 100255 SEMS 6-32 X 3/8 PHIL PAN INTERNAL
6 004810 EXTRUSION BRACKET 5" 56 018617 AMPLIFIER HEATSINK
7 094360 FOAM TAPE 1/2 X 1/2 57 017160 MOUNTING TAB W/ .140 DIA MTG
8 018588 BOTTOM EXTRUSION 58 084187 ISOSTRATE
9 101172 TCS 6-32 X 1/4 PHIL FLAT U/C 59 112087 PCB SPACER 1/4"
10 018587 TOP EXTRUSION 60 049346 HEATSINK PCB ASSY
11 017363 PLEXIGLAS FILTER LIGHT BLUE 61 101059 SM 6 X 5/8 PHIL PAN TYPE A
12 017711 DISPLAY PLEXIGLAS 62 114118 TRANSISTOR CLIP 218
13 004804 SUBPANEL 63 114119 TRANSISTOR CLIP 214
14 112092 REVERSE LOCKING PCB SUPPORT 64 110009 NUT M5 X 0.8 BRASS WITH GOLD PLATE
15 049354 LAMP PCB ASSY 65 104130 LK #10 SPLIT PHOS/BRONZE
16 022315 FISHPAPER SHIELD 66 104148 FLAT WASHER BRASS
17 114072 PLASTIC RIVET 67 084189 DUAL BINDING POST RED
18 101054 TS 6-32 X 1/4 PH PAN TAPTITE BLK 68 084124 DUAL BINDING POST
19 112086 NYLON SPACER 69 102020 MACH NUT 6-32 SELF-LOCK
20 102001 KEP NUT 4-40 CADMIUM PLATE 70 178161 FUSE HOLDER 5 X 20mm IEC
21 004805 SWITCH BRACKET 71 104016 LK WASH: 1/2 X .630 X .022 INT STAR
22 146243 POWER SWITCH 72 004800 OUTPUT PLATE
23 124077 METER 73 005022 REAR PANEL
24 092341 FILTER AZURE BLUE 74 117487 AC LINE RECEPTACLE
25 092342 FILTER PALE BLUE 75 101197 HI/LO 4-24 X 3/8 PHIL ROUND BLACK
26 017447 PLASTIC LIGHT BOX 76 101114 SM 4-24 X 1/2 PHIL PAN TYPE A
27 004809 TOP COVER 77 017706 TERMINAL COVER
28 101078 TS 8-32 X 5/16 PHIL PAN BLK 78 094332 DOUBLE COATED MTG TAPE 1/8" THICK
29 005023 TRAY 79 078017 GROMMET 3/4 X 9/16
30 078003 RUBBER GROMMET 80 104142 LOCKWASHER 2.5mm INT STAR ZINC
31 106007 SPRING CLIP: LATCH TYPE
32 112038 STL SPACER 4 X 3/8 NICKEL PLT
33 112104 BOARD MOUNT
34 049352 POWER SUPPLY METER PCB ASSY
35 112102 MOUNTING STRAPS
36 049350 OUTPUT TRANSFORMER
37 049349 POWER TRANSFORMER
38 005024 CHASSIS
39 017218 PLASTIC FEET-BLACK
40 104063 FLAT WASHER #10 CLEAR ZINC
41 100159 MS 10-32 X 3/4 PHIL PAN BLK ZINC
42 104067 LK WASH: INTERNAL STAR #10
43 100120 MS 10-32 X 1/4 PHIL PAN ZINC
44 101176 TCS 6-32 X 1/2 PH PAN BLK TYPE F
45 074091 AC TERMINAL BLOCK
46 104001 FLAT STEEL WASHER #4 X 9/32 X .025
47 104004 LK WASHER 5 X .255 INT STAR
48 102022 MN 4-40 3/16 X 3/16
49 084135 THERMAL PAD
50 070139 RECTIFIER BRIDGE
23 24
REPACKING INSTRUCTIONS
25
POWER AMPLIFIER
SERVICE MANUAL
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 040722