McIntosh MX 120 Service Manual
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Extracted text from McIntosh MX 120 Service Manual (Ocr-read)
Page 1
PERFORMANCE SPECIFICATIONS 2 Audio Specifications Frequency Response Left, Center, Right, Left Surround, Right Surround, Left Back, Right Back: ±0.5dB from 20Hz-20,000Hz Subwoofer 1: ±0.5dB from 20Hz-140Hz Total Harmonic Distortion 0.005% maximum from 20Hz to 20,000Hz at rated output Signal To Noise Ratio Phono:86dB below 10mV input (A Weighted) High Level:96dB below rated output (A Weighted) Rated Output Voltage 2.5V Unbalanced Outputs (Main) 5.0V Balanced Outputs (Main) Maximum Voltage Output 9.5V Unbalanced 19V Balanced Output Impedance 100 ohms Unbalanced 200 ohms Balanced Input Impedance Phono:47k Ohms, 65pf High Level:22k Ohms Unbalanced 50k Ohms Balanced Sensitivity for Rated Output Phono: 5mV High Level:500mV Unbalanced 1V BalancedMaximum Input Signal Phono: 50mV High Level: 5V Unbalanced 10V Balanced Voltage Gain Phono to REC Out:40dB Phono to Output (Main):54dB High Level to REC Out: 0dB High Level to Output (Main):14dB Tone Controls Bass Control: ±12dB at 30Hz Treble Control:±12dB at 10,000Hz General Specifications Power Requirements 100 Volts, 50/60Hz at 65 watts 110 Volts, 50/60Hz at 65 watts 120 Volts, 50/60Hz at 65 watts 220 Volts, 50/60Hz at 65 watts 230 Volts, 50/60Hz at 65 watts 240 Volts, 50/60Hz at 65 watts Note: Refer to the rear panel of the MX120 for the correct voltage. Overall Dimensions Width is 17-1/2 inches (44.45cm) Height is 7-5/8 inches (19.37cm) including feet Depth is 18-3/4 inches (47.63cm) including the Front Panel and Knobs Weight 27 pounds (12.25Kg) net, 46 pounds (20.87Kg) shipping Shipping Carton Dimensions Width is 25 inches (63.5cm) Depth is 27 inches (68.6cm) Height is 12 inches (30.5cm) 1 If any of the Channels have the Loudspeaker Setting of Small, the subwoofer has an electronic low pass filter with a 24dB per Octave rolloff in all modes except external. 1. 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. NOTES 2. On PC board drawings, Square pad indicates: a. Polarized Capacitors - Positive b. Diodes - Cathode c. Others - Pin 1 3.WARNING Parts marked with the symbol have critical characteristics. Use only replacement parts recommended by the manufacturer.
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MX120 3 SECTION LOCATION REAR PANEL
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MX120 2122 SURROUND 750570 SCH 2 OF 6 3