McIntosh Power Amplifier MC303, Руководство по обслуживанию

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1. Unless otherwise noted, all voltages indicated on
the schematics are measured under the following
conditions:
a. AC input at rated voltage marked on rear panel.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
2. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH)
3. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
4.
WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
NOTES
PERFORMANCE SPECIFICATIONS
Specifications
Power Output
Minimum sine wave continuous average power output per
channel, all channels operating:
300 watts into a 2 ohm, 4 ohm or 8 ohm load
Output Load Impedance
2, 4 or 8 ohms
Rated Power Band
20Hz to 20,000Hz
Total Harmonic Distortion
0.005% maximum harmonic distortion at any power level
from 250 milliwatts to rated power, 20Hz to 20,000Hz
Dynamic Headroom
1.8dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Input Sensitivity (for rated output)
1.7 Volt Unbalanced
3.4 Volt Balanced
Signal To Noise Ratio (A-Weighted)
112dB below rated output
Intermodulation Distortion
0.005% maximum, if the instantaneous peak power output
does not exceed twice the rated power output for any com-
bination of frequencies from 20Hz to 20,000Hz.
Wide Band Damping Factor
Greater than 40
Input Impedance
10,000 ohms
Power Guard
Less than 2% THD with up to 14dB overdrive at
1,000Hz
Power Control Input
5VDC - 12VDC
Power Control Output
12VDC, 25mA maximum, delay 0.2 seconds
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 6 Amps
230 Volts, 50/60Hz at 6 Amps
240 Volts, 50/60Hz at 6 Amps
Standby: Less than 1 watt
Note: Refer to the rear panel of the MC303 for the
correct voltage.
Overall Dimensions
Width is 17-3/4 inches (45.09cm)
Height is 12-3/8 inches (31.43cm) including feet
Depth is 22 inches (55.88cm) including the Front
Panel and Cables
Weight
155 pounds (70.3 kg) net, 180 pounds (81.6 kg) in
shipping carton
Shipping Carton Dimensions
Width is 31 inches (78.74cm)
Depth is 28 inches (71.12cm)
Height is 17-1/4 inches (43.82cm)