McCulloch 96012010400 Lawn Mower User Manual
Contents
1. 8 Rear Panel Connections and Switches 9 How to Connect for Stereo uunaceeenasseeennseeennneeennneennnnnn 10 How to Connect for Mono u nn 12 Front Panel Displays and Controls nasan aa naasa 14 HOME ODE ee 15 Technical Desperat 17 SPEC Ca AA 18 Packing LE se 19 Important Information Caution The MC402 Amplifier weight is 110 5 pounds 50 1 kilograms It requires two or more persons to safely handle when moving the amplifier 1 The following Connecting Cable is available from the McIntosh Parts Department Power Control Cable Part No 170 202 Six foot 2 conductor shielded with two 1 8 inch stereo mini phone plugs 2 For additional connection information refer to the owner s manual s for any component s connected to the MC402 3 The MC402 mutes the speaker outputs for approximately two seconds when first turned on 4 It is very important that loudspeaker cables of adequate size be used so that there will be no power loss The size is specified in Gauge Numbers or AWG American Wire Gauge The smaller the Gauge number the larger the wire size If your loudspeaker cables are 50 feet 38 Im or less use at least 14 Gauge If your loudspeaker cables are 100 feet 76 2m or less use at least 12 Gauge 5 In the event that the MC402 over heats due to improper ventilation and or high ambient temperature the protection circuits will activate The Front Panel Powe2. being careful to observe the correct polarities Output impedance connections of 2 ohms 4 ohms and 8 ohms are provided If the Loud speakers Impedance is in between the available con nections 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 6 Attach the Terminal Connections Cover with the five previously removed screws to the Rear Panel of the MC402 Amplifier Refer to figure 7 7 Connect the MC402 power cord to an active AC outlet Cover Mounting Screw Location Cover Mounting Screw Locations How to Connect for Stereo E McIntosh Audio Control Center Eie knh 6 0 6 6 s 6 ollo 6 6 6 6 6 6 550 ag 0 0 0 0 0 0 0 0 10 6 0 6 0 00 E De pa Miiniosh uzez rele NI GNI T To AC Outlet 4 Right Left Loudspeaker Loudspeaker 4 ohm 4 ohm Melntosh How to Connect for Mono Parallel l 2 3 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 For Remote Power Control connect a power control cable from the Audio Control Center or Preamplifier
3. more than 0 005 at rated power output for all frequencies from 20Hz to 20 000Hz Typical performance at mid fre quencies is less than 0 002 The true distortion readings on the MC402 are so low it takes special measuring tech niques to make accurate readings The MC402 can deliver the best possible performance from any type of high qual ity Loudspeaker system Creating an amplifier with this level of performance did not come easily Many months of design testing and mea suring were required Extensive controlled listening tests the ultimate form of measuring were made before the final design was accepted Design Philosophy The design philosophy incorporated in the MC402 in volved several different techniques all based on sound sci entific logic Every stage of voltage or current amplifica tion must be as linear as possible prior to the use of nega BALANCED O MUTE PG INPUT O ATTENUATOR ATTENUATOR TURN ON DELAY UNBALANCED O INPLT Block Diagram of the Amplifier and Meter Circuitry tive feedback McIntosh engineers know how to properly design negative feedback circuits so they contribute to the extremely low distortion performance expected from a McIntosh amplifier The typical McIntosh owner would never accept the approximately 100 times higher distortion of many non feedback designs Double Balanced Push Pull design is used from input to output Each half of the amplifier contains complimentary balanced circuit
4. 08000680 600066 12 1 4 31 12cm 18 3 4 47 63cm 16 5 16 41 43cm Side View of the MC402 3 1 4 3 16 20 96cm 0 48cm k 7 8 E 2 29cm NT al 115 16 33 02cm 2 38cm Installation Installation The MC402 can be placed upright on a table or shelf bottom and 3 inch 7 62cm on each side of the amplifier standing on its four feet It also can be custom installed ina so that airflow is not obstructed Allow 22 inches piece of furniture or cabinet of your choice The four feet 55 88cm depth behind the front panel Allow I inch may be removed from the bottom of the MC402 when it is 2 54cm in front of the mounting panel for knob clearance custom installed as outlined below The four feet together Be sure to cut out a ventilation hole in the mounting shelf with the mounting screws should be retained for possible according to the dimensions in the drawing future use if the MC402 is removed 17 1 16 from the custom 43 34cm installation and used free standing The required panel cutout ventilation cutout and unit di mensions are shown Always provide adequate ventila tion for your MC402 Cool op eration ensures the longest possible operating life for any electronic in strument Do not install the MC402 directly above a heat generating component such as a high powered am plifier If the MC402 is installed in a cabinet a quiet running ventilation fan can be a defi nite asset in main taining the cooles
5. MC402 incorpo rates the McIntosh Sentry Monitor Output Transistor Pro tection Circuit which protects the amplifier in the event of a shorted Loudspeaker Connec Normal Operating Area Output Transistor Failure Sentry Monitor Safety Area Figure 22 tion Refer to Figure 22 The MC402 also includes the unique patented McIntosh Power Guard circuit Power Guard eliminates the possibil ity of ever overdriving the amplifier into clipping Figures 23 24 and 25 are actual Spectrum Analyzer measurements of a McIntosh Power Amplifier with a test signal consisting of 14kHz and 15kHz sine waves An overdriven amplifier can produce both audible and inaudible distor tion levels exceeding 40 The audible distortion is unpleasant to hear but the inaudible ultrasonic distortion 1s also undesirable since it can damage valuable Loudspeaker system tweeters You will never experience the harsh and damaging distortion due to clipping The Power Guard circuit is a waveform comparator monitoring both the input and output wave forms Under normal operating conditions there are no differ ences between the shape of these waveforms If an amplifier chan nel 1s overdriven there will be a difference between the two signal waveforms When the difference exceeds 0 3 equivalent to 0 3 harmonic distortion the Power Guard activates the PG light and a dynamic electronic attenuator at the amplifier input reduces the in put volu
6. Power Control Out to the MC402 Power Control In Connect a cable from the Balanced Output of a McIn tosh Preamplifier or Control Center to the MC402 R MONO Balanced Input Note An optional hookup is to use an unbalanced cable Prepare three Loudspeaker Hookup Cables one twelve inch 30 48 cm and one thirteen inch 33 02 cm Jumper Cables along with the desired length in a Loudspeaker Hookup Cable that attaches to the MC402 Power Am plifier Output Terminals by choosing one of the meth ods below Bare wire cable ends Carefully remove sufficient insulation from the cable ends refer to figures 8 9 amp 10 If the cable is 127mm stranded carefully twist Figure 8 Figure 9 Figure 10 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 Spade lug or prepared wire connection Insert the spade lug connector or prepared section of the cable end into the terminal side access hole and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out Refer to fig ures 11 12 amp Bid us 13 Lu Terminal Connections Cover Cover Mounting Screw Locations I 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 se cure the banana plug
7. in place Note The Banana Plugs are for use in the United States and Canada only Figure 12 Remove the five screws from the MC402 Chassis Rear Panel and Left Side Retain these screws for later use Refer to figure 14 Connect the prepared twelve inch 30 48 cm Jumper Cable between the two Output terminals and the thirteen inch 33 02 cm Jumper Cable between the two appropriate Impedance amp Output Terminal as outlined in the chart located on the next page 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 I ohms 2 ohms and 4 ohms are provided If the Loud speakers Impedance is in between the available con nections 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 Attach the Terminal Connections Cover with the five previously removed screws to the Rear Panel of the MC402 Amplifier Refer to figure 7 8 Connect the MC402 power cord to an ac tive AC outlet Cover Mounting Screw Location C
8. 2 inch screws and washers must be used to fasten the unit securely to the bottom pad and shipping skid This will en sure the proper equipment location on the bottom pad Fall ure to do this will result in shipping damage Use the original shipping carton and interior parts only if they are all in good serviceable condition If a shipping carton or any of the interior part s are needed please call or write Customer Service Department of McIntosh Labo ratory Please see the Part List for the correct part numbers INNER 7 CARTON TOP FOAM PAD cdd INNER CARTON IMPORTANT 2 Read Above u INNER CARTON BOTTOM nk Flat WASHER 4x 1 4 20 X 2 1 4 CAP SCREW 4x FOAM PAD FRONT AND REAR 2X SHIPPING CARTON BOTTOM Quantity Part Number Description 1 034052 Shipping carton top 1 034051 Shipping carton bottom 2 034054 Foam Pad top and bottom 2 034186 Foam Pad front and rear 2 034187 Foam Pad sides 1 034136 Inner carton top 1 034137 Inner carton bottom 1 034188 Foam Pad inner carton 1 034008 Bottom pad 1 034226 Shipping skid 4 101212 1 4 20x2 1 4 cap screw 4 104058 Flat washer SHIPPING CARTON TOP lt gt FOAM PAD TOP AND BOTTOM 2X ph INSIDE BOX ev FOAM PAD SIDE 2X 19 McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 McIntosh Part No 040838
9. Carefully remove sufficient insulation from the cable ends refer to figures 1 2 amp 3 If the cable is t stranded carefully twist 127m 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 Spade lug or prepared wire connection Insert the spade lug connector or pre pared section of the cable end into the e terminal side access Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Minish RE Terminal Connections Cover Cover Mounting Screw Locations Figure 7 hole and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out Refer to figures 4 5 amp 6 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 Remove the five screws from the MC402 Chassis Rear Panel and Left Side Retain these screws for later use Refer to figure 7 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
10. Fuse holder BALANCED INPUTS POWER CONTROL INPUT MODE refer to information for audio cables from a OUT sends a turn On Off Switch selects be on the back panel preamplifier or control Trigger to the next McIn tween the BAL of the MC402 to center audio outputs tosh component ANCED or UNBAL determine the cor ANCED INPUTS rect fuse size and rating Nendor vrar PCMNM AWPLIPIEN E Noi Dr TA Ir Fh RIGHT OUTPUTs LEFT OUTPUTS Connections for 2 Connections for 2 4 and 8 ohm 4 and 8 ohm Loudspeakers Loudspeakers Connect the MC402 power cord to a live AC outlet Refer to information on the back panel to deter mine the correct volt age Melntosh 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 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 2 Connect cables from the Balanced Outputs of a McIn tosh Preamplifier or Control Center to the MC402 Bal anced 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
11. Owner s Manual MC402 Power Amplifier ft Intosh MC402 McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 FAX 607 724 0549 Melntosh The lightning flash with arrowhead within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within A the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons WARNING TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE IMPORTANT SAFETY INSTRUCTIONS PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT General NI l 2 3 4 S Read these instructions Keep these instructions Heed all warnings Follow all instructions Warning To reduce risk of fire or electrical shock do not expose this equipment to rain or moisture This unit is capable of producing high sound pres sure levels Continued exposure to high sound pres sure levels can cause permanent hearing impair ment or loss User caution is advised and ear protec tion is recommended when playing at high volumes Caution to prevent electrical shock do not use this polarized plug with an extension cord receptacle or other outlet unless the blades can be fully in serted to prevent blade exposure Attention pour pevenir les chocs elecriques pas utiliser cette fiche polarisee avec un prolongat
12. d McIntosh Dealer name are important to you for possible insurance claim or future service The spaces below have been provided for you to record that information Serial Number Purchase Date Dealer Name Technical Assistance If at any time you have questions about your McIntosh product contact your McIntosh Dealer who is familiar with your McIntosh equipment and any other brands that may be part of your system If you or your Dealer wish addi tional help concerning a suspected problem you can re ceive technical assistance for all McIntosh products at McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 1545 Fax 607 723 3636 Customer Service If it is determined that your McIntosh product is in need of repair you can return it to your Dealer You can also return it to the McIntosh Laboratory Service Department For as sistance on factory repair return procedure contact the McIntosh Service Department at McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 3515 Fax 607 723 1917 Copyright 2002 O by McIntosh Laboratory Inc Melntosh Table of Contents TI 2 Thank You and Please Take a Moment 3 Technical Assistance and Customer Service 3 Table of Contents Important Information and Connector Information gen 4 Mol 4 Periormance CO AA 4 DN 5 Tasa CO EE NE 6 TOD c
13. eur une prise de courant ou un autre sortie de courant sauf si les lames peuvent etre inserees afond ans en laisser aucune partie a decouvert Unplug this equipment during lightning storms or when unused for long periods of time Only use attachments accessories specified by the manufacturer CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVI S RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR The exclamation point within an equi lateral triangle is intended to alert the user to the presence of important operating and maintenance servic ing instructions in the literature ac companying the appliance A 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 Installation 9 10 11 12 13 14 The equipment shall be installed near the AC Socket Outlet and the disconnect device shall be easily acces sible Do not block any ventilation openings Install in accor dance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other equipment including amplifiers that produce heat Do not use this equipment near water Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids such as vases are placed on the equipment Use only with the cart stand tripod bracke
14. in parallel the load to the power amplifier may drop to two ohms or even less A power amplifier connected to a load that is lower than optimum causes more output current to flow which results in extra heat being generated in the power output stage This increase in temperature will result in a reduced life expectancy for the amplifier The Autoformer creates an ideal match between the power amplifier output stage and the Loudspeaker A McIntosh amplifier with an Autoformer can be used to safely drive multiple speakers without reducing the life ex pectancy of the power ampli fier Refer to Figure 21 There is absolutely no per formance limitation with an Autoformer Its frequency re sponse exceeds that of the out put circuit itself and extends well beyond the audible range Its distortion level is so low it is virtually impossible to mea sure In the rare event of a power amplifier output circuit fail ure the McIntosh Autoformer provides absolute protection from possible damage to your valuable Loudspeakers The unequaled expertise of McIntosh in the design and manu facturing of Autoformers is legendary in the high fidelity industry McIntosh engineers know how to do it right Figure 21 Protection Circuits The different types of protection circuits incorporated in the MC402 insure a long and safe operating life This is just one of the many character istics of McIntosh Power Am plifiers that make them world famous The
15. me just enough to prevent any further increase in distortion Figure 25 The Power Guard circuit acts so fast that there are abso lutely no audible side effects and the sonic purity of the music reproduction is perfectly preserved The MC402 Power Amplifier with Power Guard is not limited to just the rated power output but will actually produce distortion free output well above its rated power due to the McIntosh philosophy of conservative design Input Test Signal Figure 23 Without Power Guard Figure 24 With Power Guard Power Supply Circuits To compliment the fully balanced design of the MC402 there are huge main filter capacitors that guarantee an ex cellent signal to noise ratio and the energy storage neces sary for the wide dynamic range that Digital Audio de mands Melntosh Specifications Power Output Stereo Minimum sine wave continuous average power output per channel all channels operating 1s 400 watts into 2 ohm load 400 watts into 4 ohm load 400 watts into 8 ohm load Power Output Mono Parallel Minimum sine wave continuous average power output is 800 watts into 1 ohm load 800 watts into 2 ohm load 800 watts into 4 ohm load Output Load Inpedance 2 4 or 8 ohms Stereo Mode 1 2 or 4 ohms Mono Mode Rated Power Band 20Hz to 20 000Hz Total Harmonic Distortion Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is 0 005 Intermodulatio
16. n Distortion Maximum Intermodulation Distortion if instanta neous peak output per channel does not exceed twice the rated output for any combination of fre quencies from 20Hz to 20 000Hz with all channels operating is 0 005 Dynamic Headroom 2 1dB Frequency Response 0 0 25dB from 20Hz to 20 000Hz 0 3dB from 10Hz to 100 000Hz Sensitivity 2 0 Volts Unbalanced Input 4 0 Volts Balanced Input A Weighted Signal To Noise Ratio 94dB Unbalanced 120dB below rated output 98dB Balanced 124dB below rated output Input Impedance 10 000 ohms Unbalanced Inputs 20 000 ohms Balanced Inputs 18 Specifications Wide Band Damping Factor Greater than 40 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 5 amps 230 Volts 50 60Hz at 5 amps 240 Volts 50 60Hz at 5 amps Note Refer to the rear panel of the MC402 for the correct voltage Overall Dimensions 17 1 2 inches 44 45cm W 9 7 16 inches 23 97cm H 20 inches 50 8cm D including clearance for connectors Weight 110 5 pounds 50 1kg net 143 5 pounds 65 1kg in ship ping carton Packing Instructions Packing Instructions scc AN O E In the event it is necessary to repack the equipment for shipment the equipment must be packed exactly as shown below It is very important that the four plastic feet are at tached to the bottom of the equipment Four 1 4 20 x 2 1
17. over Mounting Screw Locations Cable core nna Figure 14 How to Connect for Mono Parallel ES EUM NEU NIMIUM meet McIntosh Audio Control Center Fiia kh 800600950 6 6 6 6 6 6 6 6555 7 r5 a m O si a 3 ci zm mcm Minis c E m o 60060 6666c Jumper Cables To AC Outlet Mono Parallel Hookup Connections Loudspeaker Loudspeaker Negative Loudspeaker Positive Impedance Connection Connection Loudspeaker 10 Ohm Left and Right Output 2Q Left and Right Output 2Q AA System Q Negative Connection Positive Connection MI 4 ohm 20 Oh Left and Right Output 4Q Left and Right Output 4Q Q Ohm Negative Connection Positive Connection 40 Oh Left and Right Output 8Q Left and Right Output 8Q gm OD Negative Connection Positive Connection Melntosh Front Panel Displays and Controls POWER GUARD LED lights when POWER GUARD LED lights when the Amplifier Left Channel POWER the Amplifier Right Channel GUARD Circuit activates POWER GUARD Circuit activates METER indicates the Left Channel Remote On Indicator METER indicates the Right Channel Power Output of the amplifier lights when the amplifier Power Output of the amplifier is in the Remote Turn On Mode Helntosh METER Switch selects POWER Switch Turns the display modes of the AC Power Off Remote Power Output Meters or On How to Operate the MC402 How to Operate the MC402 Powe
18. r Guard LEDs will continuously indicate ON and the audio will be muted When the MC402 has returned to a safe operating temperature normal operation will resume 6 The MC402 incorporates the very latest in Fully Double Balanced Circuitry As a result the Loudspeaker Negative Connections are above chassis ground and are not common between channels Do not combine any connections together or ground them except as illustrated in this manual Introduction and Performance Features Connector Information XLR Connectors Below is the Pin configuration for the XLR Balanced Input and Output Connectors on the MC402 Refer to the dia gram for connection PIN 1 Shield Ground Pin 1 PIN 2 Input Pin 3 PIN 3 Input Pin 2 Power Control and Trigger Connectors The MC402 s Power Control Outputs provide a 5 volt sig nal Use a 1 8 inch stereo mini phone plug to connect to the Power Control Input on other McIntosh Components N C CIL Positive DA Ground Introduction EE Now you can take advantage of traditional McIntosh stan dards of excellence in the MC402 Power Amplifier Two 400 watt high current output channels will drive any high quality Loudspeaker system to its ultimate performance The MC402 reproduction is sonically transparent and abso lutely accurate The McIntosh Sound is The Sound of the Music Itself Performance Features 9 Power Output The MC402 consists of two separate po
19. r On To have the MC402 automatically turn On or Off when a McIntosh Control Center turns On or Off rotate the power switch to the RE MOTE Position For manual opera tion rotate the power switch to the ON or OFF Position as desired Refer to figure 15 Note There must be a power control connection between the MC402 Figure 15 and the McIntosh Control Center in order for the remote power turn on to function Meter Selection Rotate the meter mode switch to select the meter operation mode you desire Refer to figures 16 and 17 Lights Off Meter lights are turned off and the meters will Watts The meters respond to continue to indicate the power output all the musical infor mation being pro duced by the ampli fier They indicate to an accuracy of at least 95 of the power output with only a single cycle of a 2000Hz tone burst Figure 16 Hold The meter pointer is locked to the highest power peak in a sequence of peaks It 1s elec tronically held to this power level until a higher power peak passes through the ampli fier The meter pointer will then rise to the HATT ER EE E EE ee Ki u SO 40 m n n DECIBELS POWER DUTPUT Figure 17 newer higher indication If no further power peaks are reached the meter pointer will very slowly return to its rest position or lower power level Note The MC402 Power Output Meters indicate the wattage delivered to the Loudspeakers When in Mono Pa
20. rallel the actual power output is the sum of both the Right and Left Meter Indications Mode Switches The MONO PARALLEL STEREO Mode Switch which is located above the Right Channel Outputs on the Rear Panel of the MC402 allows selection of either MONO PARALLEL or STEREO Modes of Operation Refer to Figure 18 figures 18 Note There is additional information for nash mose connecting the MC402 Res ES let NE Lu ER ma and pertaining to both is modes of operation NEL How to Connect CE for Stereo on pages 10 and 11 How to Connect for Mono Parallel on pages 12 and 13 The Input Mode Switch which is located below the UNBALANCED INPUTS on the Rear Panel of the MC402 allows selection of either the UNBALANCED or BALANCED Input Connectors Refer to figure 19 MEN HO m ma Tix MU zd E ima Tele GE Para Figure 19 Melntosh Technical Description McIntosh Laboratory the company who introduced the world s first amplifier that could be called High Fidelity has done it again The McIntosh engineering staff has cre ated a power amplifier without compromise using the most advanced McIntosh circuit design concepts A continuous average power output rating of 400 watts and with an output current of greater than 100 amperes per channel makes this not only the most advanced but also one of the most powerful amplifiers McIntosh has ever manufactured The distortion limits for the MC402 are no
21. ry The resulting double balanced configu ration cancels even order distortion Refer to figure 20 All transistors are selected to have nearly constant cur rent gain over the entire current range they must cover Output transistors in particular have matched uniform cur rent gain high current bandwidth product and large active region safe operating area An automatic tracking bias sys tem completely eliminates any trace of crossover distor tion Precision metal film resistors and low dielectric ab sorption film capacitors are used in all critical circuit loca tions The output signals of the balanced circuit are coupled in the unique McIntosh MC402 Output Autoformer It pro vides low distortion power transfer at frequencies from be low 20Hz to well beyond 20 000Hz with optimum imped ance points of two ohms four ohms and eight ohms The unequaled expertise of McIntosh in the design and manu facturing of autoformers is legendary in the high fidelity industry The high efficiency circuit design of the MC402 con Figure 20 Technical Description tributes to low operating temperatures More than 2 000 square inches of heat sink area keep the MC402 operating safely with convection cooling No fans are needed Autoformers All solid state power amplifier output circuits work best into an optimum load This optimum load may vary consid erably from what a Loudspeaker requires In the case of more than one Loudspeaker connected
22. t or table specified by the manu facturer or sold with the equipment When a cart is used use caution when moving the cart equipment combination to avoid injury from tip over N UN gt Connection I 16 17 Connect this equipment only to the type of AC power source as marked on the unit Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the equipment Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 18 Do not overload wall outlets extension cords or inte gral convenience receptacles as this can result in a risk of fire or electric shock 19 To completely disconnect this equipment from the AC Mains disconnect the power supply cord plug from the AC receptacle Care of Equipment 20 Clean only with a dry cloth 21 Do not permit objects or liquids of any kind to be pushed spilled and or fall into the equipment through enclosure openings 22 Unplug the power cord from the AC power outlet when left unused for a long period of time Repair of Equipment 23 Refer all servicing
23. t possible operating temperature A custom cabi net installation should provide the following mini mum spacing di mensions for cool operation Allow at least 6 inches 15 24cm above the top 2 inches 3 81cm below the MC402 Front Panel Custom Cabinet Cutout MC4A02 Side View in Custom Cabinet MC402 Bottom View in Custom Cabinet MC402 Chassis 8 5 16 21 11cm 6 N 15 24cm Cabinet er d roni zd Custom Mounting Panel Opening E for Ventilation Support dn Opening for Ventilation Chassis Shelf 1 4 Spacers 8 26cm 124ne MS Tao 64cm Du er Cutout 16 on Center the Opening 40 64cm opening horizontally for with the Ventilation Melntosh Top Vin ma Hen nw s B i TE TE JE B i A if il nsa Bl DET hl b TT IB BEU ANO 0 i d Lu Lu u 1 E i r i n Bi PRILL TITLE amm E PTTL m EL LULU anm TG Diiis Trim LLLE STI a TT eee at FELTET LHHLIH par ATT The li HH Int nn Mite BT Mt intash Ilitinlash D AJTOFDFMER 3 de ps ma Er FAEN MAKS fk Into sh m a EE MT i E LE EEE na MCADZ POWER AMPLIFIER r Seats Hy Mk afasi ET Rear Panel Connections and Switches zen OUTPUT MODE POWER CONTROL IN UNBALANCED INPUTS Switch selects STE receives a turn On Off for audio cables from a REO or MONO Trigger from a McIntosh preamplifier or control PARALLEL Modes component center audio outputs of operation Main
24. the house s electrical wiring and protection devices Balanced and Unbalanced Inputs Balanced connections guard against induced noise and al low long cable runs without compromising sound quality Illuminated Power Meters The Illuminated Power Output Watt Meters on the MC402 are peak responding and indicate the true power output of the amplifier The Peak Watt Hold Mode allows the meters to temporarily stay at the highest power output and then slowly decay The Front Panel Meter Illumination may be switched Off at any time 9 Fiber Optic Solid State Front Panel Illumination The Illumination of the Front Panel is accomplished by the combination of custom designed Fiber Optic Light Diffus ers and Light Emitting Diodes LEDs This provides even Front Panel Illumination together with the extremely long life LEDs 9 Glass Front Panel and Super Mirror Chassis Finish The famous McIntosh Illuminated Glass Front Panel with a three dimensional look and the Stainless Steel Chassis with Super Mirror Finish ensures the pristine beauty of the MC402 will be retained for many years Into sh Dimensions Dimensions The following dimensions can assist in determining the best location for your MC402 There is additional informa tion on the opposite page pertaining to installing the MC402 into cabinets 17 1 2 44 45cm Front View of the MC402 8 1 3 1 6 9 7 16 22 38cm 23 97cm 16 13 16 42 70cm Rear View of the MC402
25. to qualified service personnel Ser vicing is required when the equipment has been dam aged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the equipment the equipment has been exposed to rain or moisture does not operate normally or has been dropped 24 Do not attempt to service beyond that described in the operating instructions All other service should be re ferred to qualified service personnel 25 When replacement parts are required be sure the ser vice technician has used replacement parts specified by McIntosh or have the same characteristics as the origi nal part Unauthorized substitutions may result in fire electric shock or other hazards 26 Upon completion of any service or repairs to this prod uct ask the service technician to perform safety checks to determine that the product is in proper operating condition Thank You He EE EEE EE e e8 7m gt Your decision to own this McIntosh MC402 Power Ampli fier ranks you at the very top among discriminating music listeners You now have The Best The McIntosh dedica tion to Quality 1s assurance that you will receive many years of musical enjoyment from this unit Please take a short time to read the information in this manual We want you to be as familiar as possible with all the features and functions of your new McIntosh Please Take A Moment The serial number purchase date an
26. wer amplifier chan nels each capable of 400 watts into 2 4 or 8 ohm speakers with less than 0 005 distortion 9 Exclusive Double Balanced Circuity Each channel of the MC402 consists of two balanced power amplifiers operating in push pull with their outputs combined in a McIntosh Autoformer This double balanced configuration from input to output cancels virtually all dis tortion 9 Patented Autoformers McIntosh designed and manufactured Output Autoformers provide an ideal match between the amplifier output stages and speaker loads of 2 4 and 8 ohms The Autoformers also provide perfect DC protection for your valuable Loud speakers 9 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 9 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 9 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 If any addi tional McIntosh Power Amplifiers are part of the system a delayed Power Control Output Trigger is available This delayed trigger reduces the strain on
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