User manual MCINTOSH MC402

[. . . ] Owner's Manual MC402 Power Amplifier MC402 McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549 The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. To prevent the risk of electric shock, do not remove cover or back. No user serviceable parts inside. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. General: 1. Warning: To reduce risk of fire or electrical shock, do not expose this equipment to rain or moisture. [. . . ] Patented Power Guard Both channels include the patented McIntosh Power Guard circuit that prevents the amplifier from being over driven into clipping, with its harsh distorted sound that can also damage your valuable Loudspeakers. Patented Sentry Monitor with Thermal Protection McIntosh Sentry Monitor power output stage protection circuits ensure the MC402 will have a long and trouble free operating life. Built-in Thermal Protection Circuits guard against overheating. Power Control The McIntosh Power Control Circuit allows for remote turn-on of the MC402 Power Amplifier from a McIntosh Audio/Video Control Center or Preamplifier. A custom cabi12-1/16" net installation 30. 64cm should provide the MC402 Bottom View following mini16" 10-3/8" Cutout in Custom Cabinet 40. 64cm 26. 35cm mum spacing diCenter the Opening mensions for cool opening horizontally for with the Ventilation operation. Allow at MC402 Chassis least 6 inches (15. 24cm) above 13" the top, 2 inches 33. 02cm (3. 81cm) below the 7 Top View 8 Rear Panel Connections and Switches OUTPUT MODE Switch selects STEREO, or MONO PARALLEL Modes of operation POWER CONTROL IN receives a turn On/Off Trigger from a McIntosh component UNBALANCED INPUTS for audio cables from a preamplifier or control center audio outputs Main Fuse holder, refer to information on the back panel of the MC402 to determine the correct fuse size and rating BALANCED INPUTS for audio cables from a preamplifier or control center audio outputs POWER CONTROL OUT sends a turn On/Off Trigger to the next McIntosh component INPUT MODE Switch selects between the BALANCED or UNBALANCED INPUTS RIGHT OUTPUTs Connections for 2, 4, and 8 ohm Loudspeakers LEFT OUTPUTs Connections for 2, 4, and 8 ohm Loudspeakers Connect the MC402 power cord to a live AC outlet. Refer to information on the back panel to determine the correct voltage 9 How to Connect for Stereo Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC402 Amplifier until after the Loudspeaker Connections have been made and the supplied protective Terminal Connections Cover has been installed. Failure to observe this could result in Electric Shock. hole, and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out. Banana plug connection: Insert the banana plug into the hole at the top of the terminal. Tighten the top portion of the terminal post and the set screw to secure the banana plug in place. Note: The Banana Plugs are for use in the United States and Canada only. 1. For Remote Power Control, connect a power control cable from the Audio Control Center or Preamplifier Power Control Out to the MC402 Power Control In. Connect cables from the Balanced Outputs of a McIntosh Preamplifier or Control Center to the MC402 Balanced Inputs. Note: An optional hookup is to use unbalanced cables. 3. Prepare the Loudspeaker Hookup Cables that attach to the MC402 Power Amplifier by choosing one of the methods below: Bare wire cable ends: Carefully remove sufficient insulation from the cable ends, refer to figures 1, 2 & 3. If the cable is stranded, carefully twist the strands together as tightly as possible. Note: If desired, the twisted ends can be tinned with solder to keep the strands together, or attach spade lug and/or banana connector. 4. Remove the five screws from the MC402 Chassis Rear Panel and Left Side. Insert the Loudspeaker Hookup Cable Ends through the openings of the supplied Terminal Connections Cover and connect to the output terminals that match the Loudspeakers' Impedance, being careful to observe the correct polarities. Output impedance connections of 2 ohms, 4 ohms and 8 ohms are provided. If the Loudspeakers' Impedance is in-between the available connections, use the nearest lower impedance connection. WARNING: Loudspeaker terminals are hazardous live and present a risk of electric shock. For additional instruction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support. Spade lug or prepared wire connection: Insert the spade lug connector or prepared section of the cable end into the terminal side access 6. Attach the Terminal Connections Cover, with the five previously removed screws, to the Rear Panel of the MC402 Amplifier. Connect the MC402 power cord to an active AC outlet. Terminal Connections Cover Cover Mounting Screw Location Cover Mounting Screw Locations Cable Openings Figure 7 10 Cover Mounting Screw Locations How to Connect for Stereo McIntosh Audio Control Center To AC Outlet Right Loudspeaker 4 ohm Left Loudspeaker 4 ohm 11 How to Connect for Mono Parallel Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC402 Amplifier until after the Loudspeaker Connections have been made and the supplied protective Terminal Connections Cover has been installed. Failure to observe this could result in Electric Shock. 1. [. . . ] This is just one of the many characteristics of McIntosh Power Amplifiers that make them world famous. The MC402 incorporates the McIntosh Sentry Monitor Output Transistor Protection Circuit, which protects the amplifier in the event of a shorted Loudspeaker ConnecFigure 22 tion. The MC402 also includes the unique patented McIntosh Power Guard circuit. Power Guard eliminates the possibility of ever overdriving the amplifier into clipping. [. . . ]