McIntosh MC303

MC303
MC303
POWER
AMPLIFIER
SERVICE MANUAL
SERIAL NO. ZH1001 And Above
Performance Specifications ..........................................2
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location ..........................................................4
Block Diagram ............................................................5
Interconnection Diagram ........................................7 - 8
Backup Power Suppy Schematic and PCB .............9 - 12
Control Schematic and PCB ................................13 - 16
Input Channel 1-2 Schematic and PCB ...............17 - 20
Input Channel 3 Schematic and PCB ..................21 - 24
Capacitor Schematic and PCB ............................25 - 28
Heatsink Schematic and PCB ..............................29 - 34
Terminal Schematic and PCB ..............................35 - 38
Display Schematic and PCB................................39 - 44
Meter Control Schematic and PCB ......................45 - 46
Meter Light Schematic and PCB ..........................47 - 48
Parts List .............................................................51 - 55
Repacking Instruction ................................................57
CONTENTS

McIntosh MC303 Specifications

General

Number of Channels	3
Total Harmonic Distortion (THD)	0.005%
S/N Ratio	120 dB
Rated Power Band	20Hz - 20kHz
Frequency Response +0, -0.25dB	20Hz - 20kHz
Frequency Response +0, -3dB	10Hz - 100kHz
Input Impedance	10k ohms
Voltage Gain	26 dB
Input Sensitivity	1.0V
Power Output per Channel	300W
Damping Factor	>40
Power Requirements	120V 50/60Hz