McIntosh MA 6500 Service Manual
This is the 20 pages manual for McIntosh MA 6500 Service Manual.
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Extracted text from McIntosh MA 6500 Service Manual (Ocr-read)
Page 1
PREFORMANCE SPECIFICATIONS POWER OUTPUT, STEREO 250, 200, 120 watts minimum sine wave continuous average power output per channel, both channels operat- ing, into a load impedance of 2, 4 and 8 ohms respec- tively. TOTAL HARMONIC DISTORTION 0.005% maximum at any power level from 250 milliwatts to rated power per channel from 20Hz to 20,000Hz, both channels operating. INTERMODULATION DISTORTION 0.005% maximum if instantaneous peak power output per channel does not exceed twice the rated output with both channels operating for any combination of frequencies from 20Hz to 20,000Hz. OUTPUT LOAD IMPEDANCE 2, 4 or 8 ohms RATED POWER BAND 20Hz to 20,000Hz DYNAMIC HEADROOM 2.4dB at 2, 4 or 8 ohms DAMPING FACTOR 60 at 2 ohms 120 at 4 ohms 230 at 8 ohms FREQUENCY RESPONSE +0, -0.5dB from 20Hz to 20,000Hz SIGNAL TO NOISE RATIO, (A WEIGHTED) Phono Input: 90dB (84dB IHF) below 10mV input High Level: 100db (90dB IHF) below rated output Power Amplifier: 110dB below rated output SENSITIVITY Phono: 2.5mV for 2.5V rated output (0.5mV IHF) High Level: 250mV for 2.5V rated output (50mV IHF) Power Amplifier Input: 2.5V for rated outputINPUT IMPEDANCE Phono: 47k ohms, 65pF High Level: 22k ohms MAXIMUM INPUT SIGNAL Phono: 90mV High Level: 8V POWER REQUIREMENT 120V, 50/60Hz, 5.0 Amps UL/CSA 230V, 50/60Hz, 2.5 Amps PREAMPLIFIER MAXIMUM VOLTAGE OUTPUT Phono: 90mV at tape output High Level: 8V at tape output Main Out: 8V at preamp output VOLTAGE GAIN High Level to Tape: 0dB High Level to Main: 20dB TONE CONTROLS Bass Control: +/-12dB at 20Hz Treble Control: +/-12dB at 10kHz POWER REQUIREMENTS 100 Volts, 50/60Hz at 4.8 Amps 110 Volts, 50/60Hz at 4.4 Amps 120 Volts, 50/60Hz at 4.0 Amps 220 Volts, 50/60Hz at 2.0 Amps 230 Volts, 50/60Hz at 2.0 Amps 240 Volts, 50/60Hz at 2.0 Amps NOTE Refer to the rear panel of the MA6500 for the correct voltage. DIMENSIONS 17-1/2 inches (44.5cm) wide by 7-1/16 inches (17.9cm) high. Depth behind front panel is 18-1/8 inches (46cm) including connectors. Knob clearance required in front of the mounting panel is 1-1/8 inches (2.9cm). 2
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1. The heavy lines on the schematics denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following condi- tions: a. AC input at 120 volts, 50/60Hz b. All voltages are +\-10% with respect to ground. A high impedance (10megaohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistors values are in ohms. b. Capacitor values are in microfarads (uF). c. Inductor values are in microhenries (uH). 4. On PC Board Drawings, Square Pad Indicates: a. Polarized Capacitors - Positive b. Diode - Cathode c. Others - Pin 1 5. The voltages enclosed in a box are signal voltages that are measured with a 2.5mV, 1kHz signal connected to both channels at the TUNER input jacks. NOTES MA6500 Front panel controls are set at: BALANCE ....................................CENTER DETENT TREBLE BASS ............................. CENTER DETENT INPUT SELECTORS ...................................... TUNER LOUDNESS.......................................................... OFF POWER ................................................................... ON VOLUME ................................. FULLY CLOCKWISE MONO ...................................................................OFF SPEAKER SWITCHES 1 AND 2 ........................... ON Rear panel controls are set at: PROCESSOR........................................................ OUT PWR AMP INPUT ................................................. INT SPEAKER TERMINALS .................... NO LOAD ON OUTPUTS 6.WARNING: Parts marked with the symbol have critical characteristics. Use ONLY replacement parts recom- mended by the manufacturer. 3
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INTERCONNECT 910 MA6500