McIntosh MC207 User manual

SERVICE MANUAL
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 5
BlockDiagram ........................................................... 6
Interconnection Diagram ...................................... 7 - 8
Input Schematic and PCB.................................... 9 - 12
Heatsink 1-Channel Schematic and PCB ............ 13 - 18
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
ExplodedViews and Parts Lists .......................... 43 - 46
Repacking Instruction .............................................. 47
CONTENTS
POWER AMPLIFIER

PERFORMANCE SPECIFICATIONS
2
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).
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
Power Output
Minimum sine wave continuous average power output per
channel, all channels operating is: 200 watts into 4 ohm or
8 ohm load
RatedPowerBand
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
InputImpedance
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

REAR PANEL
3
MC207

NOTES
4

5
MC207
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
TOP VIEW

6
BLOCK DIAGRAM

7 8
MC207
1
INTERCONNECT

910
INPUT 050065
2

11 12
INPUT 050065
2
MC207

13 14
HEATSINK 1-CHANNEL 050070
3A
B

15 16
HEATSINK 1-CHANNEL DRIVER SECTION 050070
3A
B
MC207

HEATSINK 1-CHANNEL 050070
3A
B
17 18
*DenotescomponentsonreverseorbacksideofPCBoard.

NOTES
19 20
MC207

HEATSINK 2-CHANNEL 050064
4A
B
C
21 22

23 2524
HEATSINK 2-CHANNEL DRIVER SECTION 050064
4A
B
C
MC207

26 2827
5
DISPLAY ILLUMINATION SECTION 050066 HEATSINK 2-CHANNEL 050064
3A
B4A
B
C
*DenotescomponentsonreverseorbacksideofPCBoard.

5
DISPLAY METER SECTION 050066
5 DISPLAY POWER GUARD SECTION 050066
29 30
MC207

5
DISPLAY 050066
31 32
*DenotescomponentsonreverseorbacksideofPCBoard.

CAPACITOR 050063
6
33
MC207
*Denotes componentson reverseorbackside ofPC Board.

POWER SUPPLY 050062
7
34