McIntosh MC-207-2 Schematic

POWER AMPLIFIER

SERIAL NO. VQ1001 And Above

CONTENTS

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

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

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

Section Location ........................................................ 5

Block Diagram ........................................................... 6

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

Input Schematic and PCB .................................... 9 - 12

Heatsink 1-Channel Schematic and PCB ............ 13 - 18

SERVICE MANUAL

Serial Number VQ1001 And Above

Heatsink 2-Channel Schematic and PCB ............ 21 - 26

Display Schematic and PCB ............................... 29 - 32

Capacitor Schematic and PCB .................................. 33

Power Supply Schematic and PCB..................... 34 - 35

Parts List ............................................................ 36 - 42

Exploded Views and Parts Lists .......................... 43 - 46

Repacking Instruction .............................................. 47

PERFORMANCE SPECIFICATIONS

Power Output

Minimum sine wave continuous average power output per channel, all channels operating is: 200 watts into 4 ohm or 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 4 or 8 ohm loads

Dynamic Headroom

1.7dB

Frequency Response

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

Sensitivity

1.0 Volt Unbalanced with a 4 ohm Loudspeaker

2.0 Volt Balanced with a 4 ohm Loudspeaker

1.4 Volt Unbalanced with a 8 ohm Loudspeaker

2.8 Volt Balanced with a 8 ohm Loudspeaker

A-Weighted Signal To Noise Ratio

89dB (112dB below rated output)

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% for 4 or 8 ohm loads

Input Impedance

20,000 ohms Balanced 10,000 ohms Unbalanced

Wide Band Damping Factor

Greater than 60 at 4 ohms Greater than 140 at 8 ohms

Power Requirements

100 Volts, 50/60Hz at 1440 watts 110 Volts, 50/60Hz at 13.0 amps 120 Volts, 50/60Hz at 12.0 amps 220 Volts, 50/60Hz at 6.0 amps 230 Volts, 50/60Hz at 6.0 amps 240 Volts, 50/60Hz at 6.0 amps

Note: Refer to the rear panel of the MC207 for the correct voltage.

Dimensions

Front Panel: 17-1/2 inches (44.45cm) wide, 9-7/16 inches (23.97cm) high. Depth behind front mounting panel is 18-3/4 inches (47.63cm), including clearance for connectors.

Weight

83 pounds (37.6kg) net, 116 pounds (52.6kg) in shipping carton

1. The heavy lines 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).

NOTES

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.