McIntosh MC-2102 Service manual

PO WER AMPLIFIER

CONTENTS

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

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

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

Section Location ........................................................ 4

Block Diagram ...................................................... 5 - 6

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

Input Schematic and PCB.................................... 9 - 10

Daughter Schematic and PCB............................. 11 - 13

Amplifier Schematic and PCB ....................... 11 - 12, 14

SERVICE MANUAL

Power Supply Schematic and PCB..................... 15 - 18

Output Schematic and PCB............................... 17 - 18

Remote Switch Schematic and PCB ................... 19 - 20

Panel Lamp A Schematic and PCB..................... 19 - 20

Panel Lamp B Schematic and PCB ............................ 21

Meter A & B Schematic and PCB .............................. 22

Parts List ............................................................ 23 - 26

Exploded Views and Parts Lists .......................... 27 - 32

Repacking Instruction .............................................. 33

PERFORMANCE SPECIFICATIONS

Power Output

Minimum sine wave continuous average power output per channel, both channels operating is: 100 watts into 2 ohm load 100 watts into 4 ohm load

100 watts into 8 ohm load

Power Output Mono Parallel

Miniumum sine wave continuous average power output is: 200 watts into 1 ohm, 2 ohm or 4 ohm load

Power Output Mono Bridge

Miniumum sine wave continuous average power output is: 200 watts into 4 ohm, 8 ohm or 16 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:

0.5% for 2, 4 or 8 ohm loads (Stereo)

0.5% for 1, 2 or 4 ohm loads (Mono Parallel)

0.5% for 4, 8 or 16 ohm loads (Mono Bridge)

Frequency Response

+0, -0.25dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 70,000Hz

Sensitivity

2.5 Volts Unbalanced Input 5 Volts Balanced Input

A-Weighted Signal T o Noise Ratio

100dB

Intermodulation Distortion

Maximum Intermodulation Distortion if instantaneous peak output does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz is:

0.5% for 2, 4 or 8 ohm loads (Stereo)

0.5% for 1, 2 or 4 ohm loads (Mono Parallel)

0.5% for 4, 8 or 16 ohm loads (Mono Bridge)

Input Impedance

20,000 ohms Unbalanced Inputs 40,000 ohms Balanced Inputs

Wide Band Damping Factor

Greater than 18

Power Requirements

100 Volts ~ , 50/60Hz at 6.0 amps 110 Volts ~ , 50/60Hz at 5.5 amps 120 Volts ~ , 50/60Hz at 5.0 amps 220 Volts ~ , 50/60Hz at 2.5 amps 230 Volts ~ , 50/60Hz at 2.5 amps 240 Volts ~ , 50/60Hz at 2.5 amps

Note: Refer to the rear panel of the MC2102 for the correct

voltage.

Dimensions

Front Panel: 17-3/4 inches (45.08cm) wide, 10-1/8 inches (25.72cm) high. Depth behind front mounting panel is 16 inches (40.64cm). Clearance required in front of the Front

Panel is 1 inches (2.54cm) for knobs.

Weight

88 pounds (40kg) net, 121 pounds (54.9kg) 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).

NO TES

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.