McIntosh MC-501 Service manual

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Page 1

POWER AMPLIFIER

SERIAL NO. WU1001 And Above

CONTENTS

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

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

Top and Rear Views ................................................... 3

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

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

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

Driver/Heatsink Schematic and PCB ................... 9 - 13

SERVICE MANUAL

Serial Number WU1001 And Above

Power Schematic and PCB ................................ 15 - 16

Input Schematic and PCB .................................. 17 - 18

Meter/Lighting Schematic and PCB .................... 19 - 20

Parts List ............................................................ 21 - 24

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

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

Page 2

PERFORMANCE SPECIFICATIONS

Power Output

Minimum sine wave continuous average power output is: 500 watts into 2 ohm load 500 watts into 4 ohm load 500 watts into 8 ohm load

Rated Power Band

20Hz to 20,000Hz

Total Harmonic Distortion

Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is:

0.005% for 2, 4 or 8 ohm load

Dynamic Headroom

1.8dB

Frequency Response

+0, -0.25dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz

Sensitivity

2.1 Volts Unbalanced Input

4.2 Volts Balanced Input

A-Weighted Signal To Noise Ratio

97dB (124dB below rated output) Unbalanced and Balanced

Intermodulation Distortion

Maximum Intermodulation Distortion if instantaneous peak output does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz is:

0.005% for 2, 4 or 8 ohm load

Input Impedance

10,000 ohms Unbalanced Inputs 20,000 ohms Balanced Inputs

Wide Band Damping Factor

100 @ 8ohms

Power Requirements

100 Volts, 50/60Hz at 8.0 amps 110 Volts, 50/60Hz at 7.2 amps 120 Volts, 50/60Hz at 6.6 amps 220 Volts, 50/60Hz at 3.3 amps 230 Volts, 50/60Hz at 3.3 amps 240 Volts, 50/60Hz at 3.3 amps

Note: Refer to the rear panel of the MC501 for the correct voltage.

Overall Dimensions

Front Panel: 17-1/2 inches (44.45cm) wide, 8-13/16 inches (22.38cm) high. Depth is 14-13/16 inches (37.62cm) including the Front Panel and Knobs

Weight

91.5 pounds (41.6 kg) net, 105.5 pounds (48 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

5. WARNING

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

Page 3

TOP and REAR PANEL

MC501

TOP VIEW

REAR VIEW

Page 4

SECTION LOCATIONS

TOP VIEW WITH COVER REMOVED

BOTTOM VIEW WITH COVER REMOVED

Page 5

BLOCK DIAGRAM

MC501

5 6

Page 6

INTERCONNECT

7 8

Page 7

MC501

DRIVER/HEATSINK 749828 SCH 1 OF 2

DRIVER SECTION

9 10

Page 8

2A 2B

DRIVER/HEATSINK 749828 SCH 2 OF 2

HEATSINK SECTION

11 12

Page 9

MC501

2A 2B

DRIVER/HEATSINK 749828 PCB

NOTES

13 14

Page 10

POWER 749831

SCH AND PCB

15 16

Page 11

MC501

INPUT 749829 SCH AND PCB

17 18

Page 12

METER/LIGHTING 749830 SCH AND PCB

19 20

Page 13

PARTS LIST

INTERCONNECT

Ref. No.

BP1 BINDING POST, RED 117937 BP2 BINDING POST, BLK 117938 BP3 BINDING POST, RED 117937 BP4 BINDING POST, BLK 117938 BP5 BINDING POST, RED 117937 BP6 BINDING POST, BLK 117938 DI DIODE, BRIDGE RECTIFIER 070181 F1 FUSE 089134 J1 RECEPT ACLE, AC LINE 117487 MT1 METER 124093 RT1 THERMISTER ASSY 052008 RT2 THERMISTER ASSY 052008 S1 SWITCH 146243 S2 SWITCH 146243 T1 TRANSFORMER, POWER 749846 T2 TRANSFORMER, OUTPUT 749847 TB1 TERMINAL BLOCK AC 074091

DRIVER/HEA TSINK PCB 749828

C1 CAP DISC MONO .47UF 50V 061320 C2 CAP MONO .1UF 50V 20% Z5U 061346 C3 CAP MONO .1UF 50V 20% Z5U 061346 C4 CAP ELECT 47UF 35V 066446 C5 CAP ELECT 10UF 100VDC 066462 C6 CAP ELECT 10UF 100VDC 066462 C7 CAP MONO .1UF 50V 20% Z5U 061346 C8 CAP MONO .1UF 50V 20% Z5U 061346 C9 CAP MONO 220PF 200V 10% NPO 061342 C10 CAP MONO 100PF 100V 10% NPO 061341 C11 CAP MONO 100PF 100V 10% NPO 061341 C13 CAP MPF 0.0047UF 5% 63VDC 064308 C14 CAP POLYPROP 0.15UF 10% 250VDC 064363 C15 CAP POLYPROP .047UF 10% 250VDC 064364 C16 CAP ELECT 10UF 100VDC 066462 C17 CAP ELECT 10UF 100VDC 066462 C18 CAP MONO .01UF 50V 20% X7R 061345 C19 CAP ELECT 47UF 35V 066446 C20 CAP ELECT 47UF 35V 066446 C21 CAP MONO .01UF 50V 20% X7R 061345 C22 CAP MONO .1UF 50V 20% Z5U 061346 C23 CAP MONO 100PF 100V 10% NPO 061341 C24 CAP MONO 100PF 100V 10% NPO 061341 C25 CAP MONO .1UF 50V 20% Z5U 061346 C26 CAP MPF 0.47UF 5% 100VDC 064442 C27 CAP MPF 0.47UF 5% 100VDC 064442 C12 CAP ELECT 220UF 25V 066507 D1 DIODE SILICON 070174 D2 DIODE SILICON 070174 D3 DIODE SILICON 070174 D4 DIODE SILICON 070174 D5 DIODE SILICON 070174 D6 DIODE 200V 3A 070126 D7 DIODE 200V 3A 070126 J1 CONN MALE 9 POS FRICTION LOCK 117244 J2 CONN MALE 9 POS FRICTION LOCK 117244 J3 CONN HEADER 2 PIN 0.156 117404 J4 BLADE FASTON W/FEET 117708

Description

Part No.

MC501

Ref. No. Description

J5 CONN 4 PIN 117215 J6 BLADE FASTON .110 117712 J7 BLADE FASTON W/FEET 117708 J8 CONN 2 PIN MALE 117213 LD1 LDR NETWORK 144179

PC BD DRIVER/HEATSINK 129657 Q1 TRANSISTOR PNP SILICON 132304 Q2 TRANSISTOR NPN SILICON 132317 Q3 TRANSISTOR NPN SILICON 132317 Q4 TRANSISTOR N JFET 132319 Q5 TRANSISTOR N JFET 132319 Q6 TRANSISTOR N JFET 132319 Q7 TRANSISTOR PNP 120V 132255 Q8 TRANSISTOR PNP 132254 Q9 TRANSISTOR PNP 120V 132255 Q10 TRANSISTOR PNP SILICON 132304 Q11 TRANSISTOR PNP 120V 132255 Q12 TRANSISTOR PNP 132254 Q13 TRANSISTOR NPN SILICON 132317 Q14 TRANSISTOR PNP 132254 Q15 TRANSISTOR NPN SILICON 132317 Q16 TRANSISTOR PNP SILICON 132304 Q17 TRANSISTOR NPN 132325 Q18 TRANSISTOR PNP 132326 Q19 TRANSISTOR NPN SILICON 132317 Q20 TRANSISTOR PNP SILICON 132304 Q21 TRANSISTOR NPN SILICON 132317 Q22 TRANSISTOR NPN 132325 Q23 TRANSISTOR PNP 132326 Q24 TRANSISTOR NPN 132324 Q25 TRANSISTOR PNP 132323

Q26 TRANSISTOR NPN POWER 132328 Q27 TRANSISTOR PNP POWER 132329 Q28 TRANSISTOR NPN POWER 132328 Q29 TRANSISTOR PNP POWER 132329 Q30 TRANSISTOR NPN POWER 132328 Q31 TRANSISTOR PNP POWER 132329 Q32 TRANSISTOR NPN POWER 132328 Q33 TRANSISTOR PNP POWER 132329 Q34 TRANSISTOR NPN POWER 132328 Q35 TRANSISTOR PNP POWER 132329 U1 IC DUAL AMP 133259

R1 RES MF 10 OHM 1% 1/4W 144553 R2 RES MF 10 OHM 1% 1/4W 144553 R3 RES MF 4.75K 1% 1/4W 144520 R4 RES MF 100 OHM 1% 1/4W 144568 R5 RES MF 475 OHM 1% 1/4W 144509 R6 RES MF 22.1K 1% 1/4W 144564 R7 RES MF 10M 1% 1/4W 144575 R8 RES MF 267K 1% 1/4W 144532 R9 RES MF 2.21K 1% 1/4W 144584 R10 RES MF 221 OHM 1% 1/4W 144559 R11 RES MF 267K 1% 1/4W 144532 R12 RES MF 47.5K 1% 1/4W 144526 R13 RES MF 47.5K 1% 1/4W 144526 R14 RES MF 3.32K 1% 1/4W 144518 R15 RES MF 221 OHM 1% 1/4W 144559 R16 RES MF 1K 1% 1/4W 144513 R17 RES MF 221 OHM 1% 1/4W 144559

Part No.

Ref. No.

R18 RES MF 3.32K 1% 1/4W 144518 R19 RES MF 221 OHM 1% 1/4W 144559 R20 RES MF 1K 1% 1/4W 144513 R21 RES MF 221 OHM 1% 1/4W 144559 R22 RES MF 267 OHM 1% 1/4W 144560 R23 RES MF 267K 1% 1/4W 144532 R24 RES MF 187K 1% 1/4W 144621 R25 RES MF 324 OHM 1% 1/4W 144597 R26 RES MF 324 OHM 1% 1/4W 144597 R27 RES MF 3.79K .5% 1/4W 144711 R28 RES MF 6.49K .5% 1/4W 144617 R29 RES MF 221 OHM 1% 1/4W 144559 R30 RES WW 2 OHM 10% 5W 139253 R31 RES WW 4 OHM 5% 5W 139248 R32 RES FP 22 OHM 5% 1/4W 137111 R33 RES FP 22 OHM 5% 1/4W 137111 R34 RES MF 324 OHM 1% 1/4W 144597 R35 RES MF 324 OHM 1% 1/4W 144597 R36 RES WW 0.1 OHM 5% 1W 144697 R37 RES MF 22.1K 1% 1/4W 144564 R39 RES MF 22.1K 1% 1/4W 144564 R40 RES MET OX 680 OHM 5% 1/2W 137099 R41 RES MET OX 680 OHM 5% 1/2W 137099 R42 RES MF 1.82K 1% 1/4W 144582 R43 RES MET OX 430 OHM 5% 1/2W 137101 R44 POT TRIM 200 OHM 20% HORIZ AD 134506 R45 RES MF 1.82K 1% 1/4W 144582 R46 RES MET OX 47 OHM 5% 1/2W 137102 R47 RES WW DUAL .47 OHM 5% 5W 139252 R48 RES WW DUAL .47 OHM 5% 5W 139252 R49 RES WW DUAL .47 OHM 5% 5W 139252 R50 RES WW DUAL .47 OHM 5% 5W 139252 R51 RES WW DUAL .47 OHM 5% 5W 139252 R52 RES MF 1K 1% 1/4W 144513 R53 RES MF 1K 1% 1/4W 144513 R54 RES WW DUAL .47 OHM 5% 5W 139252 RT1 SENSOR THERMAL 144249

POWER PCB 749831

C1 CAP POLYPROP .047UF 10% 250VDC 064364 C2 CAP ELECT 10UF 50V 066445 C5 CAP ELECT 22UF 100V 066574 C6 CAP ELECT 3300UF 35V 066509 C7 CAP ELECT 3300UF 35V 066509 C8 CAP ELECT 4.7UF 50V 066512 C9 CAP ELECT 10UF 100VDC 066462 D1 DIODE RECTIFIER 070175 D2 DIODE RECTIFIER 070175 D3 DIODE RECTIFIER 070175 D4 DIODE RECTIFIER 070175 D5 DIODE RECTIFIER 070175 D6 DIODE RECTIFIER 070175 D7 DIODE SILICON 070174 HS1 HEATSINK T0220 080014 HS2 HEATSINK T0220 080014 J1 BLADE FASTON W/FEET 117708 J2 BLADE FASTON W/FEET 117708

Description

Part No.

21 22

Page 14

PARTS LIST cont’d

POWER PCB 749831 (Cont’d.)

Ref. No . Description

J3 BLADE FASTON W/FEET 117708 J4 BLADE FASTON W/FEET 117708 J5 BLADE FASTON W/FEET 117708 J6 BLADE FASTON W/FEET 117708 J9 BLADE FASTON W/FEET 117708 J7 CONN MALE 7 PIN 117217 J8 CONN 4 PIN 117215 J10 CONN 4 PIN 117215 J13 BLADE FASTON W/FEET 117708 J11 CONN HEADER 2 PIN 0.156 117404 J12 CONN HEADER 2 PIN 0.156 117404 J14 CONN MALE 9 POS FRICTION LOCK 117244 J15 CONN MALE 9 POS FRICTION LOCK 117244 J16 CONN MALE 9 POS FRICTION LOCK 117244 J17 BLADE FASTON W/FEET 117708 J18 BLADE FASTON W/FEET 117708 K1 RELAY 48VDC TV-F 087080 PCB1 PC BD POWER SUPPLY 129660 Q1 TRIAC OPTOCOUPLER 131024 Q2 TRANSISTOR NPN SILICON 132317 Q3 TRANSISTOR PNP SILICON 132304 Q4 TRANSISTOR NPN SILICON 132317 Q5 TRANSISTOR PNP SILICON 132304 Q6 TRANSISTOR P CHAN JUNCTION FET 132320 Q7 TRANSISTOR PNP SILICON 132304 U2 IC REGULATOR -15V 133588 U1 IC REGULATOR 15V 133589 R1 RES MF 33.2K 1% 1/4W 144694 R2 RES MF 33.2K 1% 1/4W 144694 R3 RES MF 2.74M 1% 1/4W 144578 R4 RES WW 1.5K 5% 5W 139247 R5 RES MF 1.1K 1% 1/4W 144514 R6 RES MF 22.1K 1% 1/4W 144564 R7 RES MF 1M 1% 1/4W 144577 R8 RES MF 12.1K 1% 1/4W 144550 R9 RES MF 2.1K 1% 1/4W 144585 R10 RES MF 12.1K 1% 1/4W 144550 R11 RES MF 3.32K 1% 1/4W 144518 R12 RES MF 20K 1% 1/4W 144524 R13 RES MF 2.1K 1% 1/4W 144585 R14 RES MF 150K 1% 1/4W 144627 R15 RES WW 2.7 OHM 10% 2W FP 139259 R16 RES WW 2.7 OHM 10% 2W FP 139259 SP1 BRACKET PCB CARD MOUNTING 003611 SP2 BRACKET PCB CARD MOUNTING 003611 SP4 BRACKET PCB CARD MOUNTING 003611 SP32 BRACKET PCB CARD MOUNTING 003611 T1 TRANSFORMER CURRENT 159353

SCR MS 6-32 X 3/16 SEMS PH PN 400348

INPUT PCB 749829

C1 CAP ELECT 10UF 50V 066445 C2 CAP ELECT 10UF 50V 066445 C3 CAP MONO .1UF 50V 20% Z5U 061346 C4 CAP MONO 47PF 200V 10% NPO 061340 C5 CAP MONO 22PF 200V 10% NPO 061339 C6 CAP MONO 22PF 200V 10% NPO 061339

Part No.

Ref. No.

C7 CAP MPF 0.22UF 5% 63VDC 064329 C8 CAP ELECT 10UF 50V 066445 C9 CAP MONO .1UF 50V 20% Z5U 061346 C10 CAP MONO .1UF 50V 20% Z5U 061346 C11 CAP MPF 0.022UF 5% 63VDC 064316 J1 CONN XLR FEM HORIZ PCB LATCH 117814 J2 JACK RCA 1P RED 117706 J3 JACK HEADPHONE DUAL BLACK 1/8” 117825 J5 CONN MALE 9 POS FRICTION LOCK 117244 J6 CONN MALE 9 POS FRICTION LOCK 117244 PCB1 PC BD INPUT 129658 R1 RES MF 100 OHM 1% 1/4W 144568 R2 RES MF 174K 1% 1/4W 144601 R3 RES MF 174K 1% 1/4W 144601 R4 RES MF 68.1 OHM 1% 1/4W 144507 R5 RES MF 10K 1% 1/4W 144504 R6 RES MF 10K 1% 1/4W 144504 R7 RES MF 10K 1% 1/4W 144504 R8 RES MF 1M 1% 1/4W 144577 R9 RES MF 1.5K 1% 1/4W 144539 R10 RES MF 1.5K 1% 1/4W 144539 R11 RES MF 20K 1% 1/4W 144524 R12 RES MF 10 OHM 1% 1/4W 144553 R13 RES MF 10 OHM 1% 1/4W 144553 S1 SWITCH SLIDE DPDT 148076 SP1 BRACKET PCB CARD MOUNTING 003611 U1 IC OPERATIONAL AMP LOW NOISE 133565 U3 IC REGULATOR +5V 133568 U2 IC NAND SCHMIT 2-IN X 4 133595

METER/LIGHTS PCB 749830

C1 CAP MONO .1UF 50V 20% Z5U 061346 C2 CAP ELECT 1000UF 25V 066513 C3 CAP MONO .1UF 50V 20% Z5U 061346 C4 CAP MONO .1UF 50V 20% Z5U 061346 C5 CAP MONO .1UF 50V 20% Z5U 061346 C6 CAP MPF 1UF 5% 63VDC 064337 C7 CAP MPF 0.22UF 5% 63VDC 064329 D1 DIODE ZENER 8.2V 1/2W 070130 D2 DIODE SILICON 070174 D3 DIODE SILICON 070174 D4 DIODE SILICON 070174 D5 DIODE SILICON 070174 D6 DIODE SILICON 070174 D7 DIODE SILICON 070174 D8 DIODE SILICON 070174 D9 LED AMBER 058133 DS1 LED BLU 5MM HI-INTENSITY 058166 (DS1) SPACER LED 112108 DS2 LED GRN 5MM HI-INTENSITY 058165 (DS2) SPACER LED 112108 DS3 LED BLU 5MM HI-INTENSITY 058166 (DS3) SPACER LED 112108 DS4 LED GRN 5MM HI-INTENSITY 058165

Description

SCR MS 6-32X1/4 SEMS PH PN CLR 400250

NUT KEP 6-32 SPECIAL 402045

SPACER LED 3/4” LONG 017927

Part No.

Ref. No. Description

(DS4) SPACER LED 112108 DS5 LED GRN 5MM HI-INTENSITY 058165 (DS5) SPACER LED 112108 DS6 LED GRN 5MM HI-INTENSITY 058165 (DS6) SPACER LED 112108 DS7 LED GRN 5MM HI-INTENSITY 058165 (DS7) SPACER LED 112108 DS8 LED RED HIGH EFFICIENCY 058148 D10 DIODE SILICON 070174 D11 DIODE SILICON 070174 D12 DIODE SILICON 070174 J1 CONN MALE 9 POS FRICTION LOCK 117244 J2 CONN 4 PIN 117215 J3 CONN 3 POS MALE MTS100 NORMAL 117214 J4 HEADER 2 PIN LATCHING 117766 J5 CONN 4 PIN 117215 Q1 TRANSISTOR NPN SILICON 132317 Q2 TRANSISTOR NPN SILICON 132317 Q3 TRANSISTOR NPN SILICON 132317 Q4 TRANSISTOR NPN SILICON 132317 Q5 TRANSISTOR NPN SILICON 132317 Q6 TRANSISTOR PNP 132254 Q7 TRANSISTOR PNP 132254 U1 IC DUAL OPERATIONAL AMPLIFIER 133578 U2 IC DUAL OPERATIONAL AMPLIFIER 133578 R1 RES MF 47.5K 1% 1/4W 144526 R2 RES MF 47.5K 1% 1/4W 144526 R3 RES MF 10K 1% 1/4W 144504 R4 RES MF 10K 1% 1/4W 144504 R5 RES MF 8.25 OHM 1% 1/4W 144558 R6 RES MF 93.1K 1% 1/4W 144625 R7 RES MF 7.5K 1% 1/4W 144571 R8 RES MF 12.1K 1% 1/4W 144550 R9 RES MF 221K 1% 1/4W 144629 R10 RES MF 150K 1% 1/4W 144627 R11 RES MF 4.75K 1% 1/4W 144520 R12 RES MF 200K 1% 1/4W 144531 R13 RES MF 681 OHM 1% 1/4W 144567 R14 RES MF 18.2K 1% 1/4W 144563 R15 RES MF 22.1K 1% 1/4W 144564 R16 RES MF 10M 1% 1/4W 144575 R17 RES MF 150K 1% 1/4W 144627 R18 RES MF 12.1K 1% 1/4W 144550 R19 RES MF 4.75K 1% 1/4W 144520 R20 POT TRIM 2K OHM 20% 134507 R21 POT TRIM 2K OHM 20% 134507 R22 POT TRIM 100K OHM 20% 134504 R23 RES MF 365 OHM 1% 1/4W 144505 R24 RES MF 365 OHM 1% 1/4W 144505 R26 RES MF 12.1K 1% 1/4W 144550 R29 RES MF 806 OHM 1% 1/4W 144512 R30 RES MF 200K 1% 1/4W 144531 R31 RES MF 4.75K 1% 1/4W 144520 R25 RES MF 100 OHM 1% 1/4W 144568 R27 RES MF 2.74M 1% 1/4W 144578 R28 RES MF 562 OHM 1% 1/4W 144622

PC BD METER 129659

Part No.

23 24

Page 15

EXPLODED VIEW

MC501

25 26

Page 16

EXPLODED VIEW con’t and PARTS LIST

Ref No.

1 016492 CENTER GLASS PLATE 2 016491 GLASS P ANEL W/HOLE 3 018717 END CAP 4 018715 TOP/BOTTOM END CAP 5 018711 CENTER EXTRUSION 7 749321 ASSY KNOB 8 104164 WASHER FELT BLK 1 X 1/4 X 1/16 9 400342 SCREW 6-32 X 3/8 FILLISTER HD 10 092418 FILTER BLUE DISPLA Y 11 005309 GLASS PANEL PLATE 12 005311 GAP PLATE 13 400276 SCREW MACH SEM 6-32 X 5/16 PH PN 14 401074 SCREW TAPPING 4-40 X 1/4 PH PN 15 005788 METER CLAMP 16 017913 LOGO BACKLIGHT 17 094430 FOAM TAPE 1/8” THK 18 124093 METER 19 163026 LOGO PUSHBUTTON BACKLIGHT 20 094274 T APE ADHESIVE 21 163037 BACKLIGHT METER 2.8 X 6.1 22 005306 SUBPANEL 23 146243 SWITCH POWER

Part No.

Description

24 021159 BUSHING SWITCH 25 104138 WASHER FIBER .150ID X .312OD 26 402045 KEP NUT 6-32 SPECIAL 27 021030 SPACER 6 X 1/4 28 749830 ASSY METER PCB 29 401054 SCREW TAPTITE 6-32 X 1/4 PH PN BLK 30 401172 SCREW TC 6-32 X 1/4 PH FL U/C 31 005291 DUST COVER 32 400200 SCREW MACH 10-32 X 1/2 TRUSS HD 33 126937 DECAL TOP COVER 34 401059 SCREW SM 6-18 X 5/8 PH PN TYPE A 35 749846 POTTED TRANSFORMER POWER 36 749847 POTTED TRANSFORMER OUTPUT 37 166131 DECAL POWER TRANSFORMER 38 166130 DECAL OUTPUT TRANSFORMER 39 005305 CHASSIS 40 749829 ASSY INPUT PCB 41 101197 SCREW HI/LO 4-24 X 3/8 PH HD BLK 42 400250 SCREW MACH SEMS 6-32 X 1/4 PH PN 43 117938 POST BINDING BLACK 44 117937 POST BINDING RED 45 178161 HOLDER FUSE 46 117487 RECEPT ACLE AC LINE 47 078024 GROMMET RUBBER 1” ID 48 078025 GROMMET RUBBER 3/4” ID 49 018690 HEATSINK 50 749828 ASSY DRIVER/HEATSINK PCB 51 084206 ISOSTRATE 52 112087 SPACER PCB 1/4 53 414141 CLIP RIGHT ANGLE 54 749831 ASSY POWER SUPPLY PCB 55 005307 SUPPORT BRACKET 56 102006 NUT MACH 10-32 W/LOCK 57 005308 CAPACITOR STRAP 58 094391 TAPE FOAM 1/8 X 3/4 59 074091 TERMINAL BLOCK AC 60 404001 WASHER FLAT 61 404004 WASHER LOCK 2.5mm INT STAR 62 402022 NUT MACH 4-40 X 3/16 X 1/16 63 005240 HEATSINK VENT 64 401176 SCREW TC 6-32 X 1/2 PH PN BLK 65 404005 WASHER FLAT STEEL 66 070181 DIODE BRIDGE RECTIFIER 67 084135 PAD THERMAL 68 402005 NUT MACH 8-32 W/LOCK 69 017452 KLIP WIRE 70 402003 NUT 6-32 SELF LOCK 71 401078 SCREW TAP 8-32 X 5/16 PH PN BLK 72 102052 NUT GOLD SUPPLIED W/117758 73 104162 WASHER LOCK INTERNAL TOOTH 74 102051 NUT HEX M9 X .75 GOLD PLATED 75 005235 HEATSINK COVER 76 404016 WASHER INT STAR .5 X .630 X .022 77 005635 BOTTOM COVER 79 017218 FOOT PLASTIC BLACK 80 404033 WASHER FLAT #10 CLEAR 81 400159 SCREW MACH 10-32 X 3/4 PH PN BLK

2827

Page 17

REPACKING INSTRUCTIONS

MC501

Page 18

POWER AMPLIFIER

SERVICE MANUAL

SERIAL NO. WU1001 And Above

The continuous improvement of its 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 040876