McIntosh MC-602 Service manual

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Page 1

POWER AMPLIFIER

CONTENTS

Performance Specifications........................................ 2

Notes ......................................................................... 2

Rear Panel.................................................................. 3

Section Location ........................................................ 4

Block Diagram ...................................................... 5 - 6

Interconnection Diagram ...................................... 7 - 8

Heatsink Schematic and PCB.............................. 9 - 10

Driver Schematic and PCB................................ 11 - 13

Input Schematic and PCB ......................................... 1 4

SERVICE MANUAL

Capacitor Schematic and PCB ................................. 15

Meter Schematic and PCB ................................. 17 - 19

Indicator Schematic and PCB................................... 20

PG Light Schematic and PCB ............................ 21 - 22

Meter Lamps Schematic and PCB ..................... 21 - 22

Standby Light Schematic and PCB .................... 21 - 22

Parts List............................................................ 23 - 24

Exploded View and Parts List............................. 25 - 28

Repacking Instructions ............................................. 29

Page 2

PERFORMANCE SPECIFICATIONS

POWER OUTPUT STEREO

600 watts into 2, 4 or 8 ohm loads is the minimum sine wave continuous average power output per channel with both channels operating.

OUTPUT LOAD IMPEDANCE

2, 4 or 8 ohms

RA TED POWER BAND

20Hz to 20,000Hz

DYNAMIC HEADROOM

2.1dB

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.

INTERMODULA TION DISTOR TION

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.

SENSITIVITY

2.45 Volts Unbalanced Input

4.9 Volts Balanced Input

INPUT IMPEDANCE

10,000 ohms Unbalanced and Balanced

WIDE BAND DAMPING FACTOR

100 @ 8 ohms

POWER REQUIREMENTS

100 Volts, 50/60Hz at 18 amps 110 Volts, 50/60Hz at 16.5 amps 120 Volts, 50/60Hz at 15 amps 220 Volts, 50/60Hz at 8.2 amps 230 Volts, 50/60Hz at 7.8 amps 240 Volts, 50/60Hz at 7.5 amps

NOTE: Refer to the rear panel of the MC602 for the correct voltage.

DIMENSIONS

Front Panel: 17-3/4 inches (46cm) wide, 11 inches (28cm) high. Depth behind front mounting panel is 19-5/8 inches (49.83cm). Clearance required in front of front panel is 1-3/4 inches (4.5cm).

WEIGHT

155lbs. (70.3kg) Net 180lbs. (81.6kg) Shipped

SIGNAL TO NOISE RATIO (A WEIGHTED)

93dB Unbalanced (120dB below rated output) 97dB Balanced (124dB below rated output)

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

5. WARNING Parts marked with the symbol have critical characteristics. Use only replacement parts recommended by the manufacturer.

Page 3

REAR PANEL

MC602

Page 4

SECTION LOCATIONS

Page 5

BLOCK DIAGRAM

MC602

Page 6

INTERCONNECT

Page 7

MC602

HEATSINK

049368

Page 8

DRIVER

049369

Page 9

MC602

DRIVER

049369

INPUT

049222

Page 10

CAPACITOR

049367

NOTES

Page 11

MC602

METER

049384

Page 12

METER

049384

INDICATOR

049371

Page 13

MC602

PG LIGHT

049370

METER LAMPS

049373

STANDBY LIGHT

049395

Page 14

PARTS LIST

Part No. Description Reference No.

049368 HEATSINK

061300 MONO CAP 100PF 100V 5% NPO T&R C7 C8 061304 MONO CAP .01UF 50V 5% X 7R T&R C9 C16 061305 MONO CAP .1UF 50V 5% Z50 T&R C3 C5 064363 CAP POLYPROP 0.15MF 10% 250VDC C10 066446 CAP ELECT 47MF 35V C1 C2 070047 SILICON DIODE 1N4148 T&R D1 D2 D3 D4 D5 070133 DIODE 200V,6A D6 D7 117213 2-PIN MALE CONNECTOR J4117217 MALE CONN 7 PIN J1117404 HEADER 2-PIN 0.156 J2117708 F ASTON BLADE W/FEET J4 117712 FASTON BLADE .110 J5 132171 TRANSISTOR NPN Q1 132172 TRANSISTOR SI PNP MPSA55 Q2 132285 TRANSISTOR NPN 25C3334C Q6 132286 TRANSISTOR PNP 2SA32IC Q7 134390 TRIM POT 200 OHM 20% HORIZ AD R13 137093 MET OX 680 5% .5W R2 R9 137094 MET OX 1.8K 5% .5W R6 R11 137095 MET OX 430 5% .5W R7 137096 MET OX 47 5% .5W R12 139177 WIREWOUND RES 0.5 OHM 5W 5% R31 R32 R33 R34 R35 R36

R37 R38 R40 R41 R42 R43 144071 RES MF 365 1% 1/4W R1 R8 144187 RES MF 22.1K 1% 1/4W R3 R10 144243 RES WW 0.1 5% 1W R39 144249 THERMAL SENSOR RT1 144378 RES MF 2.21 OHM 1/4W 1% R30

049369 DRIVER

061002 DISC CAP 1.8PF+/-.25PF NPO C42 C43 061199 DISC CAP 100PF 10% N1500 50V C2 C3 C4 C5 C6 C7 C8 C9 061248 DISC CAP .1MF,25V,Y5T C1 C10 061256 M.CAP 470PF,5%,100V C26 C27 C28 C29 064308 CAP MPOLY .0047UF 5% 63-250VDC C34 C35 C36 C37 064316 CAP M POLY .022UF 5% 63VDC C38 C39 064363 CAP POLYPROP 0.15MF 10% 250VDC C30 C31 C32 C33 064364 CAP POLYPROP .047MF 10% 250V C22 C23 C24 C25 066244 CAP ELECT 0.47UF 50V 20% C20 C21 066327 CAP ELECT 470UF 10V C40 C41 066446 CAP ELECT 47MF 35V C15 C18 066462 CAP ELECT 1OUF 100VDC C11 C12 C13 C14 C16 C17 C19 117215 4-PIN CONNECTOR J8 J9 117217 MALE CONN 7 PIN J1- J2- J3- J4117219 MALE CONN 10 POS J7117279 11-POS. MALE CONN. J6132222 N. CHANNEL FET Q2 Q3 Q5 Q6 Q7 Q8 Q10 Q11 132223 TRANSISTOR NPN MPS4124 2K/REEL Q12 Q13 Q17 Q19 Q24 Q25 Q29

Q31 Q36 Q67 Q70 Q78 Q80 132224 TRANSISTOR PNP Q1 Q16 Q20 Q22 Q23 Q28 Q32

Q34 Q35 Q37 Q38 Q39 Q59 Q66 132254 TRANSISTOR NPN Q14 Q18 Q26 Q30 Q60 Q63 Q64

Q71 Q74 Q75 Q76 Q77 132255 TRANSISTOR PNP Q15 Q21 Q27 Q33 Q61 Q62 Q65

Q68 Q69 Q72 Q73 Q79 132285 TRANSISTOR NPN 25C3334C Q55 Q56 Q57 Q58 132286 TRANSISTOR PNP 2SA32IC Q40 Q41 Q42 Q43 133260 DUAL OPERATIONAL AMPLIFIER IC1 137042 FLAMEPROOF RES 47 OHM 5% 1/4W R3 R27 R74 R80 139005 WIRE RES 2 OHMS 10% 5W R110 R112 R114 R116 139119 WIRE RES 4 OHMS 5% 5W R109 R111 R113 R115 144015 RES MF 33.2K 1% 1/4W R104 R106 R107 R108

144028 RES MF 866 1% 1/4W R2 R4 R30 R57 R64 R65 R83 R91 144071 RES MF 365 1% 1/4W R17 R18 R19 R20 R21 R22 R23 R29

R42 R43 R44 R45 R46 R47 R48 R67 144090 RES MF 1K 1% 1/4W R60 R86 144095 RES MF 3.32K 1% 1/4W R53 R69 R72 R75 R92 R95 R97 R98 144097 RES MF 4.75K 1% 1/4W R58 R84 144108 RES MF 47.5K 1% 1/4W R61 R63 R87 R90 144113 RES MF 100K 1% 1/4W R76 R77 R78 R79 144128 RES MF 1.5K 1% 1/4W R10 R12 R35 R37 144172 RES MF 221 1% 1/4W R6 R24 R31 R49 R150 R151 R152

R153 144179 LDR NETWORK VTL5C9 LDR1 LDR2 144187 RES MF 22.1K 1% 1/4W R7 R32 R101 144196 RES MF 100 1% 1/4W R5 R62 R89 R100 144265 RES MF 2.21M 1/4W R9 R15 R34 R40 144298 RES MF 2.21K 1% 1/4W R103 R105 144338 RES MF 324 OHM 1% 1/4W R16 R41 R66 R71 R73 R88 R93 R99 144352 RES MF 174K 1% 1/4W R14 R39 R59 R85 144364 RES MF 475K 1% 1/4W R8 R33 R55 R81 144398 METAL FILM RES 3.79K .5% 1/4W R11 R25 R38 R50 144401 RES MF 6.49K .5% 1/4W R13 R26 R36 R51 144443 METAL FILM RES 681K 1% 1/4W R68 R70 R94 R96

049222 INPUT

061191 DISC CAP 22PF,10%,NPO 50V C11 C12 061196 DISC CAP 47PF,20%,N470 50V C7 C8 061248 DISC CAP .1MF,25V,Y5T C9 C10 066445 ELECT CAP 10MF, 50V AMMO PACK C1 C2 C4 C6 117219 MALE CONN 10 POS J7117436 PJ261G PHON JACK, GOLD J2117494 MINI JACK J11- J12117685 XLR RECEPTACLE FEMALE J3 J4 133260 DUAL OPERATIONAL AMPLIFIER IC1 141025 RES CF 100 5% 1/4W R130 144053 RES MF 10K 1% 1/4W R131 R133 R135 R138 R140 R142 144352 RES MF 174K 1% 1/4W R132 R136 R137 R139 148059 SLIDE SWITCH S1

049367 CAPACITOR

117404 HEADER 2-PIN 0.156 J1 J2 J3 J4 117708 FASTON BLADE W/FEET J5 J6 J7 J8 J9 J10 J11 J12

049384 METER

061305 MONO CAP .1UF 50V 5% Z50 T&R C14 C21 C22 C25 C26 064329 CAP M POLY .22UF 5% 63VDC C15 C16 C28 064337 CAP M POLY 1MF 5% 63VDC C11 C12 066289 CAP ELECT 4.7UF 10% 35V C27 066309 CAP ELECT 1000UF 10V C1 C2 066361 CAP ELECT 1000UF 20% 35V C30 C31 066506 CAP ELECT 22UF 100V C29 070047 SILICON DIODE 1N4148 T&R D1 D2 D3 D4 D5 D6 D7 D9 D10

D13 D14 D15 D16 D17 D18 D19

D21 D22 D23 D24 D25 D28 070085 ZENER DIODE 6.2V 5% 500MW D27 070114 ZENER DIODE 16V 5% 500MW D26 D29 070131 DIODE RECTIFIER D30 D31 D32 080014 HEATSINK T0220 ATTACH TO Q10 Q11 Q12 087049 RELAY 48VDC VFB48HU ITT TAKAMI K1 089089 FUSE 2A SLO-BLO 5X20 F1 117214 MALE CONN 3-POS MTS100 NORMAL J8117215 4-PIN CONNECTOR J10117217 MALE CONN 7 PIN J9-

117279 11-POS. MALE CONN J1- J2117708 F ASTON BLADE W/FEET J12 J15 J16 131021 TRIAC 8A 200V Q12 131022 600V TRIAC DRIVER OPTOCOUPLER Q23 132223 TRANSISTOR NPN MPS4124 2K/REEL Q1 Q2 Q13 Q14 Q15 Q16 Q17 Q20 132224 TRANSISTOR PNP Q18 Q22 132226 TRANSISTOR P.CHANNEL JUNC.FET Q19 132242 TRANSISTOR POWER N-CHN Q10 Q11 132254 TRANSISTOR NPN Q8 Q9 Q24 Q25 133093 IC REGULATOR +5 VOLT Q21 133155 IC REGULATOR -12V IC7 133156 IC REGULATOR 12V IC6 133189 IC OPERATIONAL AMPLIFIER IC2 IC4 133192 IC NAND SCHMIT 2-IN X 4 IC5 133260 DUAL OPERATIONAL AMPLIFIER IC3 134383 TRIM POT 100K OHM 20% R1 R2 139079 WIRE RES 1.5K 10% 5W R68 139218 2.7 OHM 2W 5% WW RESISTOR FP R69 141023 RES CF 8.2 5% 1/4W R35 R39 144015 RES MF 33.2K 1% 1/4W R6 R17 144083 RES MF 5.11K 1% 1/4W R47 144091 RES MF 1.1K 1% 1/4W R60 144095 RES MF 3.32K 1% 1/4W R50 144097 RES MF 4.75K 1% 1/4W R4 R42 144108 RES MF 47.5K 1% 1/4W R44 144117 RES MF 200K 1% 1/4W R7 R11 R23 R37 144154 RES MF 12.1K 1% 1/4W R45 R51 R66 144181 RES MF 18.2K 1% 1/4W R9 R33 144187 RES MF 22.1K 1% 1/4W R5 R14 R55 R57 144195 RES MF 681 1% 1/4W R58 R67 144196 RES MF 100 1% 1/4W R10 R34 R56 144199 RES MF 3.16K 1% 1/4W R43 R48 144210 RES MF 7.5K 1% 1/4W R65 144264 RES MF 10M 1% 1/4W R8 R32 144269 RES MF 1M 1/4W R54 R59 144271 RES MF 2.74M 1/4W R12 R41 R64 144296 RES MF 1.82K 1% 1/4W R63 144364 RES MF 475K 1% 1/4W R71 R72 144406 METAL FILM RES 187K 1% 1/4W R46 R49 R52 R53 144419 MF RES 150K 1% 1/4W R30 R31 R36 R40 R70 159215 CURRENT TRANSFORMER T1 T2 178159 FUSE HOLDER 5X20MM PCB MOUNT F1

049371 INDICATOR

058120 LAMP 14V #7373 DS1 DS2 DS9 DS13 117213 2-PIN MALE CONNECTOR J6- J7117215 4-PIN CONNECTOR J4- J9117279 11-POS. MALE CONN. J3-

049370 PG LIGHT

058133 AMBER LED D1 D2 117215 4-PIN CONNECTOR J10-

049373 METER LAMPS

058120 LAMP 14V #7373 DS3 DS4 DS5 DS6 DS8 DS10

117215 4-PIN CONNECTOR J2-

049395 STANDBY LIGHT

058148 RED LED HIGH EFFICIENCY DS15 117215 4-PIN CONNECTOR J8-

(R61 & R62 ARE FOR CONVERSION)

DS12 DS14

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MC602

EXPLODED VIEW

1 0F 2

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EXPLODED VIEW

2 OF 2

AND PARTS LIST

Ref Part Description No. No.

1 016416 FRONT GLASS FAB 2 018631 HANDLE FRONT 3 018633 PANEL SIDE 4 049321 KNOB ASSEMBLY MC352 5 104017 BLK FELT WASH: 3/4 X 1/4 X 1/16 6 100200 MS 10-32 X 1/2 PH TRUSS BLK 7 092418 DISPLAY FILTER BLUE 8 017798 DISPLAY PLEXIGLAS 9 005049 PANEL PLATE 10 101142 SOCKET HEAD CAP SCREW ALLEN 11 101078 TS 8-32 X 5/16 PHIL PAN BLK 12 101172 TS 6-32 X 1/4 PHIL FLAT U/C 13 005052 DUST COVER 14 005044 SUBPANEL 15 146243 POWER SWITCH 16 021159 BUSHING SWITCH 17 005054 GUSSET BRACKET LEFT 18 005060 RIGHT GUSSET BRACKET 19 049373 LAMP PCB ASSY

20 104137 FIBRE WSHR .125ID X .312OD X.062 21 102001 KEP NUT 4-40 CADMIUM PLATE 22 049371 LIGHT PCB ASSY 23 049395 STANDBY LIGHT PCB ASSY 24 112038 STL SPACER 4 X 3/8L NICKEL PLT 25 124073 PANEL METER MC552 26 092400 BLUE FILTER AZURE 27 092401 BLUE FIL TER PALE 28 017749 METER LIGHT BOX 29 102003 MACH NUT 6-32 W/LOCK 30 049384 METER PCB 31 114072 PLASTIC RIVET: NYLON (POP-IN) 32 005059 METER SUPPORT BRACKET 33 049365 OUTPUT TRANSFORMER POT 34 049366 POWER TRANSFORMER POT 35 078025 RUBBER GROMMET 3/4 36 101054 TS 6-32 X 1/4 PH PAN TAPTITE BLK 37 005048 STAINLESS CHASSIS W/PEMS 38 018627 HEA TSINK COMPLETE

39 084180 ISOSTRA T E 40 049368 HEATSINK PCB ASSY 41 114118 TRANSISTOR CLIP 218 42 114119 TRANSISTOR CLIP 214 43 112087 PCB SPACER 1/4” 44 101059 SM 6 X 5/8 PHIL PAN TYPE A 45 005058 HEA TSINK COVER LEFT 46 005055 HEA TSINK COVER RIGHT 47 005050 CAPACIT OR COVER 48 104007 LK WASHER 6 X .288 INT STAR 49 049367 CAP PCB ASSY 50 100188 SEMS MS 10-32 X 3/8 INDENTED 51 066489 27000uf 100V ELECTROLYTIC 52 005061 CAPACIT OR CLAMP 53 100250 SEMS MS 6-32 X 1/4 PHIL PAN 54 102045 KEP NUT 6-32 SPECIAL 55 005042 REAR PANEL 56 101197 HI/LO 4-24 X 3/8 PH ROUND BLK 57 104142 LOCKW ASHER 2.5mm INT STAR ZINC 58 101114 SM 4-24 X 1/2 PHIL PAN TYPE A 59 104095 LK WASH: #4 INT STAR 60 049222 INPUT PCB ASSY 61 004954 HEATSINK VENT COMPLETE 62 101176 TCS 6-32 X 1/2 PH PAN BLK TYPE F 63 005043 SUBREAR PANEL 64 005057 FRONT SUPPORT BRACKET 65 005041 CHASSIS SUPPORT BRACKET 66 102006 MACH NUT: 10-32 W/LOCK 67 070139 RECTIFIER BRIDGE MC1000 68 084135 THERMAL PAD MC7150 69 078034 GROMMET 70 074091 AC TERMINAL BLOCK 71 104001 FLAT STEEL WASH #4 X 9/32 X .025 72 104004 LK WASH 5 X .255 INT STAR 73 102022 MN 4-40 X 3/16 74 049370 PG PCB ASSY 75 024010 FOOT PAD 76 049369 DRIVER PCB ASSY 77 017770 PCB SHEILD 78 017160 MOUNTING TAB W/.140 DIA MTG 79 102005 MACH NUT: 8-32 W/LOCK 80 104014 LK WASHER 3/8 X .507 INT STAR 81 088022 CIRCUIT BREAKER 20AMP 250VAC 82 102032 HEX NUT 3/8-32 X 1/16 THK-HEX 83 117487 MC1000 AC LINE RECEPT 84 117740 BINDING POST RED 85 117741 BINDING POST BLACK 86 104162 LOCKW ASHER INTERNAL TOOTH 87 102052 NUT GOLD SUPPLIED W/117758 88 102051 HEX NUT M9 X .75 GOLD PLATED 89 100102 1/4 - 20 X 3/8 PAN PH BLK ZINC 90 102020 MCH NUT: 6-32 SLF-LOCK 91 018632 HANDLE BACK 92 017797 TERMINAL BLOCK COVER 93 005045 BOTTOM COVER 94 018445 FOOT MC1000 95 104080 FLAT WASHER #10 CLEAR ZINC 96 100159 MS 10-32 X 3/4 PH PAN BLK ZINC 97 126666 TOP COVER DECAL 98 126592 OUTPUT TRANSFORMER DECAL 99 126593 POWER TRANSFORMER DECAL

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REPACKING INSTRUCTIONS

Page 18

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 040689