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POWER AMPLIFIER

CONTENTS
Performance Specifications ........................................ 2 Notes ......................................................................... 2 Rear Panel .................................................................. 3 Section Location ........................................................ 3 Block Diagram ...................................................... 5 - 6 Interconnection Diagram ...................................... 7 - 8 Heatsink Schematic and PCB .............................. 9 - 10 Driver Schematic and PCB ................................ 11 - 12 Meter Schematic and PCB ................................. 13 - 19 Power Guard Lamp Schematic and PCB .................. 16 Meter Light Schematic and PCB ............................... 17 Panel Lamp Schematic and PCB ............................... 18 Parts List ............................................................ 19 - 20 Exploded View and Parts List ............................. 21 - 24 Repacking Instructions ............................................. 25

SERVICE MANUAL

PERFORMANCE SPECIFICATIONS
Power Output Stereo 200 watts into 2, 4 or 8 ohm loads is the minimum sine wave continuous average power output per channel with both channels operating. Power Output Mono Bridged 400 watts into 4, 8 or 16 ohm loads is the minimum sine wave continuous average power output. Output Load Impedance Stereo - 2, 4 or 8 ohms Mono - 4, 8 or 16 ohms Rated Power Band 20Hz to 20,000Hz Dynamic Headroom 1.9dB Frequency Response +0, -0.25dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz Total Harmonic Distortion 0.005% maximum at any power level from 250 milliwatts to rated power per channel from 20Hz to 20,000Hz, all channels operating. Intermodulation Distortion 0.005% maximum if instantaneous peak output per channel does not exceed twice the rated output with all channels operating for any combination of frequencies from 20Hz to 20,000Hz. Signal To Noise Ratio (A Weighted) 110dB below rated output Sensitivity 1.7 Volts Unbalanced Input 3.4 Volts Balanced Input Input Impedance 10,000 ohms Unbalanced and Balanced Wide Band Damping Factor Greater than 40 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 MC202 for the correct voltage.

Dimensions Front Panel: 17-1/2 inches (44.45cm) wide, 5-7/16 inches (13.81cm) 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 65 pounds (29.49 kg) net, 83 pounds (37.65 kg) in shipping carton.

NOTES
1. The heavy notes 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 WARNING Parts marked with the symbol have critical characteristics. Use only replacement parts recommended by the manufacturer.

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MC202

REAR PANEL

SECTION LOCATIONS

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NOTES

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MC202

BLOCK DIAGRAM

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6

INTERCONNECT

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8

MC202

2A 2B

HEATSINK 049346

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10

3 DRIVER 049353

11

12

MC202

4 METER 049352

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4 METER 049352

5A

POWER GUARD LAMP 049354

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MC202

5B

METER LIGHT 049354

5D

PANEL LAMP 049354

5C

METER LIGHT 049354

5E

PANEL LAMP 049354

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PARTS LIST
PART NO DESCRIPTION REFERENCE NO

INTERCONNECT 070139 DIODE RECTIFIER 089104 FUSE 6.3A 250V SLO BLO 124077 METER 146243 SWITCH 049349 POWER TRANSFORMER 049350 OUTPUT TRANSFORMER 074091 AC TERM BLOCK 049346 HEATSINK PCB 061300 MONO CAP 100PF 100V 5% NPO T&R 061304 MONO CAP .01UF 50V 5% X 7R T&R 061305 MONO CAP .1UF 50V 5% Z50 T&R 064363 CAP POLYPROP 0.15MF 10% 250VDC 066446 CAP ELECT 47MF 35V 070047 SILICON DIODE 1N4148 T&R 070131 DIODE RECTIFIER 117213 2-PIN MALE CONNECTOR 117217 MALE CONN 7 PIN 117404 HEADER 2-PIN 0.156 117708 FASTON BLADE W/FEET 132171 TRANSISTOR NPN 132172 TRANSISTOR SI PNP MPSA55 132285 TRANSISTOR NPN 25C3334C 132286 TRANSISTOR PNP 2SA32IC 134390 TRIM POT 200 OHM 20% HORIZ AD 137093 MET OX 680 5% .5W 137094 MET OX 1.8K 5% .5W 137095 MET OX 430 5% .5W 137096 MET OX 47 5% .5W 139177 WIREWOUND RES 0.5 OHM 5W 5% 144172 RES MF 221 1% 1/4W 144279 THERMISTOR 100 144378 RES MF 2.21 OHM 1/4W 1% 144412 MF RES 15K 1% 1/4W 049353 DRIVER PCB 061249 DISC CAP .47UF 50V MONOLITHIC 061298 MONO CAP 22PF 200V 5% NPO T&R 061299 MONO CAP 47PF 200V 5% NPO T&R 061300 MONO CAP 100PF 100V 5% NPO T&R 061305 064310 064363 064364 066446 066462 066507 117215 117217 117279 117436 117685 117759 132222 132223 132224 132254 MONO CAP .1UF 50V 5% Z50 T&R CAP MPOLY .0068UF 5% 100/250VDC CAP POLYPROP 0.15MF 10% 250VDC CAP POLYPROP .047MF 10% 250V CAP ELECT 47MF 35V CAP ELECT 1OUF 100VDC CAP ELECT 220UF 25V 4-PIN CONNECTOR MALE CONN 7 PIN 11-POS. MALE CONN. PJ261G PHON JACK, GOLD XLR RECEPTACLE FEMALE STEREO 1/8 HEAD PHONE JACK N. CHANNEL FET TRANSISTOR NPN MPS4124 2K/REEL TRANSISTOR PNP TRANSISTOR NPN

D1 F1 MT1 MT2 S1 S2 T1 T2 TB1 C7 C8 C9 C16 C3 C5 C10 C1 C2 D1 D2 D3 D4 D5 D6 D7 J4J1 J3J2 Q1 Q2 Q6 Q7 R13 R2 R9 R6 R11 R7 R12 R31 R32 R33 R34 R35 R36 R1 R8 RT1 R30 R3 R10 C31 C39 C115 C116 C118 C120 C117 C119 C27 C28 C100 C101 C102 C103 C32 C33 C105 C106 C109 C110 C107 C108 C29 C30 C35 C36 C37 C38 C104 C111 C112 C113 C114 C22 C44 J3- J4J5- J6J7J1 J2 J8 J15 J16 Q61 Q62 Q6 Q35 Q42 Q44 Q45 Q46 Q47 Q49 Q58 Q1 Q3 Q19 Q39 Q40 Q43 Q59 Q60 Q5 Q34 Q52 Q53 Q55 Q56

132255 132285 132286 133260 137042 139005 139119 144053 144086 144089 144090 144095 144097 144104 144106 144108 144112 144118 144154 144157 144172 144179 144187 144196 144264 144299 144338 144364 144406 148059

TRANSISTOR PNP TRANSISTOR NPN 25C3334C TRANSISTOR PNP 2SA32IC DUAL OPERATIONAL AMPLIFIER FLAMEPROOF RES 47 OHM 5% 1/4W WIRE RES 2 OHMS 10% 5W WIRE RES 4 OHMS 5% 5W RES MF 10K 1% 1/4W RES MF 475 1% 1/4W RES MF 806 1% 1/4W RES MF 1K 1% 1/4W RES MF 3.32K 1% 1/4W RES MF 4.75K 1% 1/4W RES MF 20K 1% 1/4W RES 33.2K 1% 1/4W RES MF 47.5K 1% 1/4W RES 82.5K 1% 1/4W RES MF 267K 1% 1/4W RES MF 12.1K 1% 1/4W RES MF 10 1% 1/4W RES MF 221 1% 1/4W LDR NETWORK VTL5C9 RES MF 22.1K 1% 1/4W RES MF 100 1% 1/4W RES MF 10M 1% 1/4W RES MF 2.1K 1% 1/4W RES MF 324 OHM 1% 1/4W RES MF 475K 1% 1/4W METAL FILM RES 187K 1% 1/4W SLIDE SWITCH

Q2 Q38 Q48 Q50 Q51 Q54 Q17 Q21 Q18 Q22 IC1 IC2 R56 R60 R177 R179 R176 R178 R45 R64 R131 R136 R164 R171 R38 R89 R92 R101 R44 R49 R41 R55 R96 R98 R133 R165 R166 R46 R47 R135 R162 R132 R148 R156 R161 R172 R175 R182 R183 R184 R185 R153 R163 R19 R27 R29 R94 R154 R155 R167 R168 R20 R28 R30 R31 R186 R150 R152 R67 R68 R139 R140 R141 R142 R143 R144 R145 R146 LD1 LD2 R157 R169 R170 R173 R48 R61 R130 R158 R160 R138 R147 R151 R174 R36 R51 R53 R76 R97 R99 R134 R137 R180 R181 R37 R52 R75 R91 S1 C207 C208 C217 C226 C227 C244 C245 C246 C241 C242 C243 C239 C240 C247 C216 C237 C238 C235 C236 D3 D4 D5 D6 D7 D8 D9 D10 D12 D12 D13 D14 D20 D1 D15 D16 D17 R1 F1 J3J2J1- J9J21- J22J14 J15 J26- J27 J28 J31 J41 J42 J50 Q9 Q8 Q10 Q13 Q14 Q16 Q17 Q18 Q20 Q21 Q22 Q23 Q24 Q11 Q12 Q3

133192 133260 134383 139079 139218 144081 144091 144106 144120 144128 144130 144157 144187 144191 144196 144265 144379 144406 144418 144421 144422 178159

IC NAND SCHMIT 2-IN X 4 DUAL OPERATIONAL AMPLIFIER TRIM POT 100K OHM 20% WIRE RES 1.5K 10% 5W 2.7 OHM 2W 5% WW RESISTOR FP RES MF 68.1K 1% 1/4W RES MF 1.1K 1% 1/4W RES 33.2K 1% 1/4W RES MF 402K 1% 1/4W RES MF 1.5K 1% 1/4W RES MF 10.2K 1% 1/4W RES MF 10 1% 1/4W RES MF 22.1K 1% 1/4W RES MF 1.21K 1% 1/4W RES MF 100 1% 1/4W RES MF 2.21M 1/4W RES METAL FILM 4.75M 1/4W 1% METAL FILM RES 187K 1% 1/4W MF RES 121K 1% 1/4W MF RES 221K 1% 1/4W MF RES 1.5M 1% 1/4W FUSE HOLDER 5X20MM PCB MOUNT

IC4 IC2 IC3 R195 R196 R198 R197 R152 R192 R2 R3 R167 R172 R191 R165 R166 R199 R164 R171 R189 R190 R194 R138 R177 R184 R180 R187 R175 R181 R186 R178 R182 R183 R188 R4 R5 R179 R185 R170 R173 R193 R174 R200 F1

049354 POWER GUARD LIGHT\METER LIGHT\PANEL LAMP PCB 058120 LAMP 14V #7373 C1 C2 C3 C4 C5 C6 C9 C10 C11 C12 058133 AMBER LED DS7 DS8 058148 RED LED HIGH EFFICIENCY DS20 117221 MALE CONN 3 POS RT. ANGLE J10117240 4 PIN RT. ANGLE J1- J2- J3- J4- J5-J6- J7- J8- J9117242 11 POS. RT ANGLE J13 117274 CONN. 2 POS. R-ANGLE J11- J12-

049352 METER PCB 061305 MONO CAP .1UF 50V 5% Z50 T&R 064329 CAP M POLY .22UF 5% 63VDC 064337 CAP M POLY 1MF 5% 63VDC 066390 CAP ELECT 22UF 100V 066445 CAP ELECT 10MF 50V 066447 CAP ELECT 100MF 16V 066504 CAPACITOR ELECT 25000UF 75V 066509 CAP ELECT 3300UF 35V 070047 SILICON DIODE 1N4148 T&R 070130 070131 087052 089089 117215 117217 117279 117404 117708 131021 131022 132223 132224 132226 133093 ZENER DIODE 8.2V 1/2W DIODE RECTIFIER RELAY 8A FUSE 2A SLO-BLO 5X20 4-PIN CONNECTOR MALE CONN:7 PIN 11-POS. MALE CONN. HEADER 2-PIN 0.156 FASTON BLADE W/FEET TRIAC 8A 200V 600V TRIAC DRIVER OPTOCOUPLER TRANSISTOR NPN MPS4124 2K/REEL TRANSISTOR PNP TRANSISTOR P.CHANNEL JUNC.FET IC REGULATOR +5 VOLT

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MC202

EXPLODED VIEW

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EXPLODED VIEW PARTS LIST
Ref No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Part No. 016411 049320 104017 018611 101042 004810 094360 018588 101172 018587 017363 017711 004804 112092 049354 022315 114072 101054 112086 102001 004805 146243 124077 092341 092342 017447 004809 101078 005023 078003 106007 112038 112104 049352 112102 049350 049349 005024 017218 104063 100159 104067 100120 101176 074091 104001 104004 102022 084135 070139 Description GLASS PANEL KNOB ASSEMBLY BLK FELT WASHER 5" ENDCAP TS 4-40 X 1/2 SLOT FILLISTER EXTRUSION BRACKET 5" FOAM TAPE 1/2 X 1/2 BOTTOM EXTRUSION TCS 6-32 X 1/4 PHIL FLAT U/C TOP EXTRUSION PLEXIGLAS FILTER LIGHT BLUE DISPLAY PLEXIGLAS SUBPANEL REVERSE LOCKING PCB SUPPORT LAMP PCB ASSY FISHPAPER SHIELD PLASTIC RIVET TS 6-32 X 1/4 PH PAN TAPTITE BLK NYLON SPACER KEP NUT 4-40 CADMIUM PLATE SWITCH BRACKET POWER SWITCH METER FILTER AZURE BLUE FILTER PALE BLUE PLASTIC LIGHT BOX TOP COVER TS 8-32 X 5/16 PHIL PAN BLK TRAY RUBBER GROMMET SPRING CLIP: LATCH TYPE STL SPACER 4 X 3/8 NICKEL PLT BOARD MOUNT POWER SUPPLY METER PCB ASSY MOUNTING STRAPS OUTPUT TRANSFORMER POWER TRANSFORMER CHASSIS PLASTIC FEET-BLACK FLAT WASHER #10 CLEAR ZINC MS 10-32 X 3/4 PHIL PAN BLK ZINC LK WASH: INTERNAL STAR #10 MS 10-32 X 1/4 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 3/16 THERMAL PAD RECTIFIER BRIDGE 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 102003 112103 049353 104005 100255 018617 017160 084187 112087 049346 101059 114118 114119 110009 104130 104148 084189 084124 102020 178161 104016 004800 005022 117487 101197 101114 017706 094332 078017 104142 MACH NUT 6-32 W/LOCK HEX SPACER 6-32 X 2.375 DRIVER PCB ASSY STEEL WASHER: FLAT 6 X 3/8 X .032 SEMS 6-32 X 3/8 PHIL PAN INTERNAL AMPLIFIER HEATSINK MOUNTING TAB W/ .140 DIA MTG ISOSTRATE PCB SPACER 1/4" HEATSINK PCB ASSY SM 6 X 5/8 PHIL PAN TYPE A TRANSISTOR CLIP 218 TRANSISTOR CLIP 214 NUT M5 X 0.8 BRASS WITH GOLD PLATE LK #10 SPLIT PHOS/BRONZE FLAT WASHER BRASS DUAL BINDING POST RED DUAL BINDING POST MACH NUT 6-32 SELF-LOCK FUSE HOLDER 5 X 20mm IEC LK WASH: 1/2 X .630 X .022 INT STAR OUTPUT PLATE REAR PANEL AC LINE RECEPTACLE HI/LO 4-24 X 3/8 PHIL ROUND BLACK SM 4-24 X 1/2 PHIL PAN TYPE A TERMINAL COVER DOUBLE COATED MTG TAPE 1/8" THICK GROMMET 3/4 X 9/16 LOCKWASHER 2.5mm INT STAR ZINC

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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