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POWER AMPLIFIER

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 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

SERVICE MANUAL

PERFORMANCE SPECIFICATIONS
Power Output Stereo 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 Output Load Impedance 2, 4 or 8 ohms 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% Intermodulation Distortion Maximum Intermodulation Distortion if instantaneous peak output per channel does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz, with all channels operating is 0.005% 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) Input Impedance 10,000 ohms Unbalanced Inputs 20,000 ohms Balanced Inputs Wide Band Damping Factor 100 (8 ohm wideband) Power Requirements 100 Volts, 50/60Hz at 8 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 17-1/2 inches (44.45cm) W, 9-7/16 inches (23.97cm) H, 14-3/4 inches (37.5cm) D, including clearance for connectors Weight 91.5 pounds (41.6kg) net, 105.5 pounds (48kg) 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.

2

MC501

TOP and REAR PANEL

TOP VIEW

REAR VIEW

3

SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED

BOTTOM VIEW WITH COVER REMOVED

4

MC501

BLOCK DIAGRAM

5

6

1

INTERCONNECT

7

8

MC501

2A 2B

DRIVER/HEATSINK
DRIVER SECTION

049828

9

10

2A 2B

DRIVER/HEATSINK
HEATSINK SECTION

049828

11

12

MC501

2A 2B

DRIVER/HEATSINK

049828

NOTES

13

14

3

POWER

049831

15

16

MC501

4

INPUT

049829

17

18

5

METER/LIGHTING

049830

19

20

MC501

PARTS LIST
Ref. No.
1

Description

Part No.
117740 117741 117740 117741 117740 117741 070139 089105 117487 124086 052008 052008 146243 146243 049846 049847 074091 J4 J5 J6 J7 J8 LD1 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25 Q26 Q27 Q28 Q29 Q30 Q31 Q32 Q33 Q34 Q35 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 BLADE FASTON W/FEET CONN 4 PIN BLADE FASTON .110 BLADE FASTON W/FEET CONN 2 PIN MALE LDR NETWORK VTL5C9 TRANSISTOR PNP TRANSISTOR NPN TRANSISTOR NPN TRANSISTOR N JFET TRANSISTOR N JFET TRANSISTOR N JFET TRANSISTOR NPN POWER TRANSISTOR SI NPN 25V TRANSISTOR NPN POWER TRANSISTOR PNP TRANSISTOR NPN POWER TRANSISTOR SI NPN 25V TRANSISTOR NPN TRANSISTOR SI NPN 25V TRANSISTOR NPN TRANSISTOR PNP TRANSISTOR NPN 25C3334C TRANSISTOR PNP 2SA32IC TRANSISTOR NPN SILICON TRANSISTOR PNP SILICON TRANSISTOR NPN TRANSISTOR NPN 25C3334C TRANSISTOR PNP 2SA32IC TRANSISTOR NPN TRANSISTOR PNP TRANSISTOR NPN POWER 2SC5200 TRANSISTOR PNP POWER 2SA1943 TRANSISTOR NPN POWER 2SC5200 TRANSISTOR PNP POWER 2SA1943 TRANSISTOR NPN POWER 2SC5200 TRANSISTOR PNP POWER 2SA1943 TRANSISTOR NPN POWER 2SC5200 TRANSISTOR PNP POWER 2SA1943 TRANSISTOR NPN POWER 2SC5200 TRANSISTOR PNP POWER 2SA1943 RES MF 10 OHM 1% 1/4W RES MF 10 OHM 1/4W RES MF 4.75K 1% 1/4W RES MF 100 OHM 1% 1/4W RES MF 475 OHM 1% 1/4W RES MF 22.1K 1% 1/4W RES MF 10M 1% 1/4W RES MF 267K 1% 1/4W RES MF 2.21K 1% 1/4W RES MF 221 OHM 1% 1/4W RES MF 267K 1% 1/4W RES MF 47.5K 1% 1/4W RES MF 47.5K 1/4W RES MF 3.32K 1% 1/4W RES MF 221 OHM 1% 1/4W 117708 117215 117712 117708 117213 144179 132224 132223 132223 132222 132222 132222 132255 132254 132255 132224 132255 132254 132223 132254 132223 132224 132285 132286 132171 132172 132223 132285 132286 132268 132267 132291 132292 132291 132292 132291 132292 132291 132292 132291 132292 144157 144157 144097 144196 144086 144187 144264 144118 144298 144172 144118 144108 144108 144095 144172 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 RT1 U1 RES MF 1K 1% 1/4W RES MF 221 OHM 1% 1/4W RES MF 3.32K 1/4W RES MF 221 OHM 1% 1/4W RES MF 1K 1% 1/4W RES MF 221 OHM 1% 1/4W RES MF 267 OHM 1/4W RES MF 267K 1% 1/4W RES MF 187K 1% 1/4W RES MF 324 OHM 1% 1/4W RES MF 324 OHM 1% 1/4W RES MF 3.79k .1 RES MF 6.49K .5/4W RES MF 221 OHM 1/4W RES WW 2 OHM 10% 5W RES WW 4 OHM 5W RES FP 22 OHM 1/4W 5 RES FP 22 OHM 1/4W 5 RES MF 324 OHM 1/4W RES MF 324 OHM 1/4W RES WW 0.1 OHM 5W RES MF 22.1K 1/4W RES MF 22.1K 1/4W RES MET OX 680 OHM 5% .5W RES MET OX 680 OHM 5% .5W RES MF 1.82K 1% 1/4W RES MET OX 430 OHM 5% .5W POT TRIM 200 OHM 20% HORIZ AD RES MF 1.82K 1% 1/4W RES MET OX 47 OHM 5% .5W RES WW DUAL .47 OHM 5% 5W RES WW DUAL .47 OHM 5% 5W RES WW DUAL .47 OHM 5% 5W RES WW DUAL .47 OHM 5% 5W RES WW DUAL .47 OHM 5W RES MF 1K 1% 1/4W RES MF 1K 1% 1/4W RES WW DUAL .47 OHM 5W SENSOR THERMAL IC OPAMP NE4558N 144090 144172 144095 144172 144090 144172 144173 144118 144406 144338 144338 144398 144401 144172 139005 139119 137033 137033 144338 144338 144243 144187 144187 137093 137093 144296 137095 134390 144296 137096 139199 139199 139199 139199 139199 144090 144090 139199 144249 133028

INTERCONNECT BP1 BINDING POST, RED BP2 BINDING POST, BLK BP3 BINDING POST, RED BP4 BINDING POST, BLK BP5 BINDING POST, RED BP6 BINDING POST, BLK DI DIODE, BRIDGE RECTIFIER F1 FUSE J1 RECEPTACLE, AC LINE MT1 METER RT1 THERMISTER ASSY RT2 THERMISTER ASSY S1 SWITCH S2 SWITCH T1 TRANSFORMER, POWER T2 TRANSFORMER, OUTPUT TB1 TERMINAL BLOCK AC DRIVER/HEATSINK PCB 049828 C1 CAP MONO 470PF 100V 10PO C2 CAP MONO .1uF 50V 20% Z5U C3 CAP MONO .1uF 50V 20% Z5U C4 CAP ELECT 47UF 35V C5 CAP ELECT 10UF 100VDC C6 CAP ELECT 10UF 100VDC C7 CAP MONO .1uF 50V 20% Z5U C8 CAP MONO .1uF 50V 20% Z5U C9 CAP MONO 220PF 100V 10PO C10 CAP MONO 100PF 100V 10% NPO C11 CAP MONO 100PF 100V 10% NPO C12 CAP ELECT 220UF 25V C13 CAP MPF 0.0047UF 5VDC C14 CAP POLYPROP 0.15UF 10VDC C15 CAP POLYPROP .047UF 10VDC C16 CAP ELECT 10UF 100VDC C17 CAP ELECT 10UF 100VDC C18 CAP MONO .01UF 50V 20% X7R C19 CAP ELECT 47UF 35V C20 CAP ELECT 47UF 35V C21 CAP MONO .01UF 50V 20% X7R C22 CAP MONO .1uF 50V 20% Z5U C23 CAP MONO 100PF 100V 10PO C24 CAP MONO 100PF 100V 10% NPO C25 CAP MONO .1uF 50V 20% Z5U C26 CAP MPF 0.47UF 5/100VDC C27 CAP MPF 0.47UF 5/100VDC D1 DIODE SILICON D2 DIODE SILICON D3 DIODE SILICON D4 DIODE SILICON D5 DIODE SILICON D6 DIODE 200V 3A D7 DIODE 200V 3A J1 CONN MALE 9 POS FRICTION LOCK J2 CONN MALE 9 POS FRICTION LOCK J3 CONN HEADER 2 PIN 0.156

2A 2B

061302 061305 061305 066446 066462 066462 061305 061305 061301 061300 061300 066507 064308 064363 064364 066462 066462 061304 066446 066446 061304 061305 061300 061300 061305 064442 064442 070047 070047 070047 070047 070047 070126 070126 117244 117244 117404

3

POWER PCB 049831 C1 CAP POLYPROP .047UF 10% 250VDC C2 CAP ELECT 10UF 50V C3 27000uF 100V Electrolytic C4 27000uF 100V Electrolytic C5 CAP ELECT 22UF 100V C6 CAP ELECT 3300UF 35V C7 CAP ELECT 3300UF 35V C8 CAP ELECT 4.7UF 50V C9 CAP ELECT 10UF 100VDC D1 DIODE RECTIFIER D2 DIODE RECTIFIER D3 DIODE RECTIFIER D4 DIODE RECTIFIER

064364 066445 066489 066489 066506 066509 066509 066512 066462 070131 070131 070131 070131

21

22

PARTS LIST con't
D5 D6 D7 HS1 HS2 J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 J12 J13 J14 J15 J16 J17 J18 K1 Q1 Q2 Q3 Q4 Q5 Q6 Q7 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 SP1 SP2 SP3 SP4 T1 U1 U2 DIODE RECTIFIER DIODE RECTIFIER DIODE SILICON HEATSINK T0220 HEATSINK T0220 BLADE FASTON W/FEET BLADE FASTON W/FEET BLADE FASTON W/FEET BLADE FASTON W/FEET BLADE FASTON W/FEET BLADE FASTON W/FEET CONN MALE 7 PIN CONN 4 PIN BLADE FASTON W/FEET CONN 4 PIN CONN HEADER 2 PIN 0.156 CONN HEADER 2 PIN 0.156 BLADE FASTON W/FEET CONN MALE 9 POS FRICTION LOCK CONN MALE 9 POS FRICTION LOCK CONN MALE 9 POS FRICTION LOCK BLADE FASTON W/FEET BLADE FASTON W/FEET RELAY 48V 18.8ma 2560 ohms TRIAC DRIVER OPTOCOUPLER 600V TRANSISTOR NPN TRANSISTOR PNP TRANSISTOR NPN TRANSISTOR PNP TRANSISTOR P CHAN JUNCTION FET TRANSISTOR PNP RES MF 33.2K 1% 1/4W RES MF 33.2K 1% 1/4W RES MF 2.74M 1/4W RES WW 1.5K 10% 5W RES MF 1.1K 1% 1/4W RES MF 22.1K 1% 1/4W RES MF 1M 1/4W RES MF 12.1K 1% 1/4W RES MF 2.1K 1% 1/4W RES MF 12.1K 1% 1/4W RES MF 3.32K 1% 1/4W RES MF 20K 1% 1/4W RES MF 2.1K 1% 1/4W RES MF 150K 1% 1/4W RES WW 2.7 OHM 10W RES WW 2.7 OHM 10W BRACKET PCB CARD MOUNTING BRACKET PCB CARD MOUNTING BRACKET PCB CARD MOUNTING BRACKET PCB CARD MOUNTING H7919-A IC REGULATOR 15V IC REGULATOR -15V 070131 070131 070047 080014 080014 117708 117708 117708 117708 117708 117708 117217 117215 117708 117215 117404 117404 117708 117244 117244 117244 117708 117708 087052 131022 132223 132224 132223 132224 132226 132224 144015 144015 144271 139079 144091 144187 144269 144154 144299 144154 144095 144104 144299 144419 139173 139173 003611 003611 003611 003611 159215 133154 133153 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 J1 J2 J3 J5 J6 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 S1 SP1 U1 U2 U3 CAP ELECT 10UF 50V CAP MONO .1uF 50V 20% Z5U CAP MONO 47PF 200V 10% NPO CAP MONO 22PF 200V 10% NPO CAP MONO 22PF 200V 10% NPO CAP MPF 0.22UF 5% 63VDC CAP ELECT 10UF 50V CAP MONO .1uF 50V 20% Z5U CAP MONO .1uF 50V 20% Z5U CAP MPF 0.022UF 5% 63VDC XLR FEMALE HORIZ PCB WITH LATCH JACK RCA 1P RED JACK HEADPHONE DUAL BLACK 1/8 CONN MALE 9 POS FRICTION LOCK CONN MALE 9 POS FRICTION LOCK RES MF 100 OHM 1% 1/4W RES MF 174K 1% 1/4W RES MF 174K 1% 1/4W RES MF 68.1 OHM 1% 1/4W RES MF 10K 1% 1/4W RES MF 10K 1% 1/4W RES MF 10K 1% 1/4W RES MF 1M 1/4W RES MF 1.5K 1% 1/4W RES MF 1.5K 1% 1/4W RES MF 20K 1% 1/4W RES MF 10 OHM 1% 1/4W RES MF 10 OHM 1% 1/4W SWITCH SLIDE BRACKET PCB CARD MOUNTING IC OPERATIONAL AMP LOW NOISE IC NAND SCHMIT 2-IN X 4 IC REGULATOR +5 VOLT 066445 061305 061299 061298 061298 064329 066445 061305 061305 064316 117814 117706 117825 117244 117244 144196 144352 144352 144082 144053 144053 144053 144269 144128 144128 144104 144157 144157 148059 003611 133067 133192 133093 DS4 DS5 DS6 DS7 DS8 J1 J2 J3 J4 J5 Q1 Q2 Q3 Q4 Q5 Q6 Q7 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 U1 U2 LED GREEN 5MM HI-INT VF[V] 3.5 LED GREEN 5MM HI-INT VF[V] 3.5 LED GREEN 5MM HI-INT VF[V] 3.5 LED GREEN 5MM HI-INT VF[V] 3.5 LED RED HIGH EFFICIENCY CONN MALE 9 POS FRICTION LOCK CONN 4 PIN CONN 3 POS MALE MTS100 NORMAL HEADER 2 PIN LATCHING CONN 4 PIN TRANSISTOR NPN TRANSISTOR NPN TRANSISTOR NPN TRANSISTOR NPN TRANSISTOR NPN TRANSISTOR SI NPN 25V TRANSISTOR SI NPN 25V RES MF 47.5K 1% 1/4W RES MF 47.5K 1% 1/4W RES MF 10K 1% 1/4W RES MF 10K 1% 1/4W RES MF 8.25 OHM 1/4W RES MF 93.1K 1/4W RES MF 7.5K 1% 1/4W RES MF 12.1K 1% 1/4W RES MF 221K 1/4W RES MF 150K 1% 1/4W RES MF 4.75K 1% 1/4W RES MF 200K 1% 1/4W RES MF 681 OHM 1% 1/4W RES MF 18.2K 1/4W RES MF 22.1K 1% 1/4W RES MF 10M 1% 1/4W RES MF 150K 1% 1/4W RES MF 12.1K 1% 1/4W RES MF 4.75K 1% 1/4W POT TRIM 500 OHM 20% HORIZ ADJ POT TRIM 500 OHM 20% HORIZ ADJ POT TRIM 100K OHM 20% RES MF 221 OHM 1% 1/4W RES MF 221 OHM 1% 1/4W RES MF 100 OHM 1% 1/4W RES MF 12.1K 1% 1/4W RES MF 2.74M 1/4W RES MF 562 OHM 1/4W RES MF 806 OHM 1/4W RES MF 200K 1% 1/4W RES MF 4.75K 1/4W IC DUAL OPERATIONAL AMPLIFIER IC DUAL OPERATIONAL AMPLIFIER 058165 058165 058165 058165 058148 117244 117215 117214 117766 117215 132223 132223 132223 132223 132223 132254 132254 144108 144108 144053 144053 144171 144417 144210 144154 144421 144419 144097 144117 144195 144181 144187 144264 144419 144154 144097 134410 134410 134383 144172 144172 144196 144154 144271 144408 144089 144117 144097 133260 133260

5

4

INPUT PCB 049829 C1 CAP ELECT 10UF 50V

066445

METER/LIGHTS PCB 049830 C1 CAP MONO .1uF 50V 20% Z5U C2 CAP ELECT 1000UF 25V C3 CAP MONO .1uF 50V 20% Z5U C4 CAP MONO .1uF 50V 20% Z5U C5 CAP MONO .1uF 50V 20% Z5U C6 CAP MPF 0.1UF 100V C7 CAP MPF 0.22UF 5% 63VDC D1 DIODE ZENER 8.2V 1/2W D2 DIODE SILICON D3 DIODE SILICON D4 DIODE SILICON D5 DIODE SILICON D6 DIODE SILICON D7 DIODE SILICON D8 DIODE SILICON D9 LED AMBER D10 DIODE SILICON D11 DIODE SILICON D12 DIODE SILICON DS1 LED BLUE 5MM HI-INT VF[V] 3.6 DS2 LED GREEN 5MM HI-INTEN VF[V] 3.5 DS3 LED BLUE 5MM HI-INT VF[V] 3.6

061305 066513 061305 061305 061305 064337 064329 070130 070047 070047 070047 070047 070047 070047 070047 058133 070047 070047 070047 058166 058165 058166

23

24

MC501

EXPLODED VIEW

25

26

EXPLODED VIEW con't and PARTS LIST
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 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 81 021159 104138 102045 021030 049830 101054 101172 005291 100200 126937 101059 049846 049847 126913 126914 005305 049829 101197 100250 117741 117740 178161 117487 078024 078034 018690 049828 084206 112087 114141 049831 005307 102006 005308 094391 074091 104001 104142 102022 005240 101176 104005 070139 084135 102005 017452 102020 101078 102052 104162 102015 005235 104016 005242 106007 017218 104033 100159 BUSHING SWITCH WASHER FIBER .150ID X .312OD KEP NUT 6-32 SPECIAL SPACER 6 X 1/4 ASSY METER PCB SCREW TAPTITE 6-32 X 1/4 PH PN BLK SCREW TC 6-32 X 1/4 PH FL U/C DUST COVER SCREW MACH 10-32 X 1/2 TRUSS HD DECAL TOP COVER SCREW SM 6 X 5/8 PH PN TYPE A POTTED TRANSFORMER POWER POTTED TRANSFORMER OUTPUT DECAL POWER TRANSFORMER DECAL OUTPUT TRANSFORMER CHASSIS ASSY INPUT PCB SCREW HI/LO 4-24 X 3/8 PH HD BLK SCREW MACH SEMS 6-32 X 1/4 PH PN POST BINDING BLACK POST BINDING RED HOLDER FUSE RECEPTACLE AC LINE GROMMET RUBBER 1" ID GROMMET HEATSINK ASSY DRIVER/HEATSINK PCB ISOSTRATE SPACER PCB 1/4 CLIP RIGHT ANGLE ASSY POWER SUPPLY PCB SUPPORT BRACKET NUT MACH 10-32 W/LOCK CAPACITOR STRAP TAPE FOAM 1/8 X 3/4 TERMINAL BLOCK AC WASHER FLAT STEEL 4 X 9/32 X .025 WASHER LOCK 2.5mm INT STAR ZINC NUT MACH 4-40 X 3/16 X 1/16 HEATSINK VENT SCREW TC 6-32 X 1/2 PH PN TYPE F WASHER FLAT STEEL 6 X 3/8 X .032 DIODE BRIDGE RECTIFIER PAD THERMAL NUT MACH 8-32 W/LOCK KLIP WIRE NUT 6-32 SELF LOCK SCREW TAP 8-32 X 5/16 PH PN BLK NUT GOLD SUPPLIED W/117758 WASHER LOCK INTERNAL TOOTH NUT HEX M9 X .75 GOLD PLATED HEATSINK COVER WASHER INT STAR .5 X .630 X .022 BOTTOM COVER SPRING CLIP LATCH TYPE FOOT PLASTIC BLACK WASHER FLAT #10 CLEAR ZINC SCREW MACH 10-32 X 3/4 PH PN BLK

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

Part No. 016492 016491 018717 018715 018711 094042 049321 104017 100342 092418 005309 005311 100276 101074 005310 017913 094430 124086 017901 094274 017923 005306 146243

Description CENTER GLASS PLATE GLASS PANEL W/HOLE END CAP TOP/BOTTOM END CAP CENTER EXTRUSION TAPE VINYL FOAM 1/16 X 1/4 ASSY KNOB WASHER FELT BLK 1 X 1/4 X 1/16 SCREW 6-32 X 3/8 FILLISTER HD FILTER BLUE DISPLAY GLASS PANEL PLATE GAP PLATE SCREW MACH SEM 6-32 X 5/16 PH PN SCREW TAPPING 4-40 X 1/4 PH PN METER CLAMP LOGO BACKLIGHT FOAM TAPE 1/8" THK METER LOGO PUSHBUTTON BACKLIGHT TAPE ADHESIVE BACKLIGHT METER 6" SUBPANEL SWITCH POWER

27

28

MC501

REPACKING INSTRUCTIONS

29

POWER AMPLIFIER
SERVICE MANUAL

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