McIntosh MC-2-KW Service manual
POWER
MODULE
POWER AMPLIFIER
SERIAL NO.
POWER MODULE WJ-A001 And Above
POWER MODULE WJ-B001 And Above
OUTPUT MODULE WJ-C001 And Above
CONTENTS
Performance Specifications ........................................ 2
Notes MC2KW ........................................................... 3
POWER MODULE
Rear Panel .................................................................. 3
Section Location ........................................................ 3
Block Diagram ........................................................... 4
Interconnection Diagram ...................................... 5 - 6
Amp Schematic and PCB ..................................... 7 - 9
Heatsink Schematic and PCB ............................ 10 - 11
Heatsink Slave Schematic and PCB ................... 12 - 13
Capacitor Schematic and PCB .................................. 14
Logo Schematic and PCB ......................................... 15
PRELIMINARY
SERVICE MANUAL
OUTPUT
MODULE
Logo Schematic and PCB ......................................... 16
Parts List ............................................................ 17 - 19
OUTPUT MODULE
Rear Panel ................................................................ 20
Section Location ...................................................... 20
Interconnection Diagram .................................. 21 - 22
Main Schematic and PCB ................................. 23 - 28
Meter Power Supply Schematic and PCB ........... 29 - 32
Meter Led Schematic and PCB .......................... 33 - 34
Parts List ............................................................ 35 - 37
Repacking Instruction .............................................. 39
PERFORMANCE SPECIFICATIONS
Power Output
2000 watts into an 8, 4 or 2 ohm load is the minimum sine
wave continuous average power output. The output RMS
voltage is:
126.5V across 8 ohms
89.5V across 4 ohms
62.2V across 2 ohms
Output Load Impedance
8, 4 and 2 ohms (with three paors of terminals each for
impedance)
Rated Power Band
20Hz to 20,000Hz
Total Harmonic Distortion
0.005% maximum harmonic distortion at any power level from
250 milliwatts to 2000 watts, 20Hz to 20,000Hz
Dynamic Headroom
2dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Sensitivity
5.0 Volts Balanced Input
2.5 Volts Unbalanced Input
A-Weighted Signal To Noise Ratio
90dB Unbalanced (123dB below rated output)
94dB Balanced (127dB below rated output)
Power Guard
Less than 2% THD with up to 14dB overdrive
General Specifications
MC2KW Output Module Power Requirements
100 Volts, 50/60Hz at 35 watts
110 Volts, 50/60Hz at 35 watts
120 Volts, 50/60Hz at 35 watts
220 Volts, 50/60Hz at 35 watts
230 Volts, 50/60Hz at 35 watts
240 Volts, 50/60Hz at 35 watts
MC2KW Power Module Power Requirements
100 Volts, 50/60Hz at 1440 watts
110 Volts, 50/60Hz at 13.0 amps
120 Volts, 50/60Hz at 12 amps
220 Volts, 50/60Hz at 7.5 amps
230 Volts, 50/60Hz at 6.5 amps
240 Volts, 50/60Hz at 6.5 amps
Note: Refer to the rear panels of the MC2KW Output Module and
MC2KW Power Modules for the correct voltage.
Overall Dimensions
MC2KW Output Module: Width is 17-3/4 inches (45.09cm),
Height us 12-5/16 inches (31.27cm) including feet, Depth is 26-5/
8 inches (62.54cm) including the front panel, handles, knobs and
interconnect cables
MC2KW Power Module: Width is 17-3/4 inches (45.09cm),
Height us 12-5/16 inches (31.27cm) including feet, Depth is 26-5/
8 inches (62.54cm) including the front panel, handles and
interconnect cables
2
2
1
Intermodulation Distortion
0.005% maximum, if instantaneous peak power output does
not exceed 4000 watts, for any combination of frequencies
from 20Hz to 20kHz.
Wide Band Damping Factor
Greater than 40
Input Impedance
10,000 ohms
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
Weight
MC2KW Output Module is 121 poulds (54.9kg) net, 146 pounds
(66.2kg) in shipping carton
MC2KW Power Module is 158 poulds (71.7kg) net, 183 pounds
(83.0kg) in shipping carton
1
The power requirements listed are for each MC2KW Power
Module, two are required for each MC2KW Power Amplifier
2
Interconnect cables are supplied with the MC2KW Output
Module and both MC2KW Power Modules connect to the
MC2KW Output Module.
NOTES
5. WARNING
6. Soft startup procedure for servicing:
2
Parts marked with the symbol have critical
characteristics. Use only replacement parts recommended by the manufacturer.
1. Interconnect output module and power modules
2 . Connect Output Module to 120VAC
3. Connect Power Modules to variac and set the
output to zero.
4 . Turn Output Module power switch to on. (This will
energize the power relays in the Power Modules.)
5 . Gradually advance the variac to 120VAC while
monitoring the AC current.
REAR PANEL
MC2KW
POWER
SECTION LOCATION
TOP VIEW WITH COVER REMOVED
3
BLOCK DIAGRAM
4
1
MC2KW
OUTPUT
INTERCONNECT
5 6
2
AMP 050215 SCH
7 8
MC2KW
POWER
2
AMP 050215 PCB
3A
3B
HEATSINK 050216 SCH
9 10
3A
3B
HEATSINK 050216 PCB
4A 4B
HEATSINK SLAVE 050282 SCH
11 12
4A
4B
HEATSINK SLAVE 050282
GP3
Rev.A
Q19
129610
R23
R22
GP4
RT1
MC2KW
POWER
Q18
R20
Q17
Q15
Q13
Q11
Q9
R3
R5
J3
J1
TO
MASTER HS
R21
R18
R19
R7
R17
R15
C11
R13
GP2
R6
J6
J5
RED
J2
BLU
J4
GRN
R16
R14
C10
R12
GP1
R4
R2
R1
Q16
Q14
Q12
Q10
Q8
13
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