McIntosh MC-202 Service manual
POWER AMPLIFIER
CONTENTS
Performance Specifications........................................ 2
Notes ......................................................................... 2
Rear Panel.................................................................. 3
Section Location ........................................................ 3
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Heatsink Schematic and PCB.............................. 9 - 10
Driver Schematic and PCB................................ 11 - 12
SERVICE MANUAL
Meter Schematic and PCB ................................. 13 - 19
Power Guard Lamp Schematic and PCB .................. 16
Meter Light Schematic and PCB............................... 17
Panel Lamp Schematic and PCB............................... 18
Parts List............................................................ 19 - 20
Exploded View and Parts List............................. 21 - 24
Repacking Instructions ............................................. 25
PERFORMANCE SPECIFICATIONS
Power Output Stereo
200 watts into 2, 4 or 8 ohm loads is the minimum sine
wave continuous average power output per channel
with both channels operating.
Power Output Mono Bridged
400 watts into 4, 8 or 16 ohm loads is the minimum
sine wave continuous average power output.
Output Load Impedance
Stereo - 2, 4 or 8 ohms
Mono - 4, 8 or 16 ohms
Rated Power Band
20Hz to 20,000Hz
Dynamic Headroom
1.9dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Total Harmonic Distortion
0.005% maximum at any power level from 250
milliwatts to rated power per channel from 20Hz to
20,000Hz, all channels operating.
Intermodulation Distortion
0.005% maximum if instantaneous peak output per
channel does not exceed twice the rated output with all
channels operating for any combination of frequencies
from 20Hz to 20,000Hz.
Signal To Noise Ratio (A Weighted)
110dB below rated output
Sensitivity
1.7 Volts Unbalanced Input
3.4 Volts Balanced Input
Input Impedance
10,000 ohms Unbalanced and Balanced
Wide Band Damping Factor
Greater than 40
Power Requirements
100 Volts, 50/60Hz at 4.8 amps
110 Volts, 50/60Hz at 4.4 amps
120 Volts, 50/60Hz at 4.0 amps
220 Volts, 50/60Hz at 2.0 amps
230 Volts, 50/60Hz at 2.0 amps
240 Volts, 50/60Hz at 2.0 amps
Note: Refer to the rear panel of the MC202 for the correct
voltage.
Dimensions
Front Panel: 17-1/2 inches (44.45cm) wide, 5-7/16
inches (13.81cm) high. Depth behind front mounting
panel is 18 inches (45.72cm). Clearance required in front
of the Front Panel is 1 inch (2.54cm) for knobs.
Weight
65 pounds (29.49 kg) net, 83 pounds (37.65 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.
2
REAR PANEL
SECTION LOCATIONS
MC202
3
NOTES
4
BLOCK DIAGRAM
MC202
5
6
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