McIntosh MC402 Service Manual

PERFORMANCE SPECIFICATIONS
Power Output Stereo
Minimum sine wave continuous average power output per
channel, all channels operating is:
400 watts into 2 ohm load
400 watts into 4 ohm load
400 watts into 8 ohm load
Power Output Mono Parallel
Minimum sine wave continuous average power output is:
800 watts into 1 ohm load
800 watts into 2 ohm load
800 watts into 4 ohm load
Output Load Inpedance
2, 4 or 8 ohms (Stereo Mode)
1, 2 or 4 ohms (Mono Mode)
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
2.1dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Sensitivity
2.0 Volts Unbalanced Input
4.0 Volts Balanced Input
A-Weighted Signal To Noise Ratio
94dB Unbalanced (120dB below rated output)
98dB Balanced (124dB below rated output)
Input Impedance
10,000 ohms Unbalanced Inputs
20,000 ohms Balanced Inputs
Wide Band Damping Factor
Greater than 40
Power Requirements
100 Volts, 50/60Hz at 12 amps
110 Volts, 50/60Hz at 11 amps
120 Volts, 50/60Hz at 10 amps
220 Volts, 50/60Hz at 5 amps
230 Volts, 50/60Hz at 5 amps
240 Volts, 50/60Hz at 5 amps
Note: Refer to the rear panel of the MC402 for the correct
voltage.
Overall Dimensions
17-1/2 inches (44.45cm) W, 9-7/16 inches (23.97cm) H, 20
inches (50.8cm) D, including clearance for connectors
Weight
110.5 pounds (50.1kg) net, 143.5 pounds (65.1kg) in ship-
ping carton
2
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 recom-
mended by the manufacturer.
NOTES

McIntosh MC402 Specifications

General

Power Output	400 watts per channel
Number of Channels	2
Total Harmonic Distortion	0.005%
Damping Factor	>40
Dynamic Headroom	1.8dB
Output Voltage	2.8V RMS Unbalanced, 5.6V RMS Balanced
Frequency Response	20Hz - 20kHz
Power Requirement	120V 50/60Hz
Dimensions	17.5 inches
Frequency Response Extended	10Hz to 100kHz +0, -3dB