McIntosh-MC-75-Service-Manual(1) 电路图 维修手册.pdf

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1、McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 MC75 60th Anniversary Tube Power Amplifier Owners Manual RadioFans.CN 收音机爱 好者资料库 2 The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of unin

2、sulated “dangerous voltage” within the products en- closure 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) ins

3、tructions 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

4、. No user-serviceable parts inside. 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block any ventilation openings. Install in accordance with the manufacturer

5、s instruc- tions. 8. Do not install near any heat sources such as radiators, heat registers, stoves, or other appa- ratus (including amplifiers) that produce heat. 9. Do not defeat the safety purpose of the polar- ized or grounding-type plug. A polarized plug has two blades with one wider than the o

6、ther. A 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. 10. Protect the power cord from being walked on o

7、r pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use only with the cart, stand, tripod, bracket, or table specified by the manu- facturer, or sold with the appa- ratus.

8、When a cart is used, use caution when moving the cart/ apparatus combination to avoid injury from tip-over. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Refer all servicing to qualified service person- nel. Servicing is required when the apparatus ha

9、s been damaged in any way, such as power- supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. 15. Do not expose this equipment to dripping or splashing a

10、nd ensure that no objects filled with liquids, such as vases, are placed on the equipment. 16. To completely disconnect this equipment from the a.c. mains, disconnect the power supply cord plug from the a.c. receptacle. 17. The mains plug of the power supply cord shall remain readily operable. 18. D

11、o not expose batteries to excessive heat such as sunshine, fire or the like. 19. Connect mains power supply cord only to a mains socket outlet with a protective earthing connection. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. RadioFans.CN 收音机爱 好者资料库 3 IMPORTANT!

12、INSTRUCTIONS FOR REMOVAL OF FOAM INSERT OVER THE VACUUM TUBES PRIOR TO CONNECTING THE A.C. POWER SUPPLY CORD, START ON THE NEXT PAGE. RadioFans.CN 收音机爱 好者资料库 4 Unpacking the MC75 Caution: To prevent damage to the MC75 Tubes during shipping, there is a special foam insert surrounding the Tubes of the

13、 Power Amplifier. The Foam Insert must be removed from the MC75 be- fore connecting the AC Pow- er Supply Cord to the power amplifier. Failure to do so has the po- tential of a Fire Hazard, resulting in damage to the MC75 and the surrounding environment. Follow these instructions for removal of the

14、packing foam before connecting the AC Power Supply Cord to the MC75. In order to remove the foam insert sur- rounding the tubes on the MC75, it is necessary to temporarily remove the Tube Cover. After the foam insert is removed, the Tube Cover is re-installed and should not be removed. The cover pro

15、vides protection from the hazardous voltages inside the MC75. The MC75 has no Figure 2 Tube Cover user serviceable parts, including the tubes. If repairs are needed they must be performed by an authorized McIntosh Service Agency. 1. Orient the MC75 so the Front is facing you and remove the Warning S

16、heet. Refer to figure 1. 2. Using a Philips Head #2 screw driver, remove the Tube Cover Screw securing the Tube Cover to the chassis on each side of the MC75. Refer to figure 2. Carefully lift up and remove the Tube Cover from the MC75. Refer to figure 3. 3. Place the Tube Cover and the previously r

17、emoved chassis screws in a safe location, as the Tube Cover will be reinstalled. Figure 1 Tube Cover Remove Foam Insert located under the Tube Cover 4. Carefully lift up and remove the Foam Insert from the MC75 exposing the Tubes. Refer to figures 4 and 5. 5. Carefully reinstall the previously remov

18、ed Tube Cover using a Tube Cover Screw on each side of the MC75. Refer to figures 6, 7A, 7B and 8. Note: Only use the chassis screws supplied with the MC75. If you can not find the chassis screws, contact the McIntosh Parts Department for replacements. 6. Save the Foam Insert and Warning Sheet with

19、the MC75 Shipping Carton for possible future use. Remove the Warning Sheet Tube Cover Screw Tube Cover Tube Cover Screw TO AVOID A FIRE HAZARD, THE FOAM INSERT OVER THE VACUUM TUBES MUST BE REMOVED PRIOR TO CONNECTING THE A.C. MAINS POWER SUPPLY CORD AND OPERATING THIS PRODUCT. WARNING REFER TO PAGE

20、 3 IN THE MC75 OWNERS MANUAL FOR INSTRUCTIONS. 5 Adequate ventilation extends the trouble free life of the MC75. Always allow air to flow through the ventilation holes on the bottom of the amplifier and a means for the warm air to escape at the top. Refer to figure 9. Allow at least 12 inches (30.48

21、cm) above the top; 4 inches (10.16cm) for the Front, Rear and Sides; and 1/2 inches (1.27cm) below the Power Amplifier so the airflow is not obstucted. Ventilation Figure 3 Figure 7A Figure 6 Figure 4 Figure 5 Figure 7B Warm Air Cool Air Figure 9 Foam Insert Unpacking the MC75 and Ventilation Figure

22、 8 Tube Cover Screw Tube Cover Screw 6 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 owners manu

23、al(s) for any component(s) connected to the MC75. 3. The MC75 mutes the speaker output for approxi- mately fifteen seconds when first turned on. 4. For the best performance and safety it is important to always match the impedance of the loudspeaker to the Power Amplifier connections. Refer to step 5

24、 on page 10. Note: The impedance of a Loudspeaker actually var- ies as the Loudspeaker reproduces different frequencies. As a result, the nominal impedance rating of the Loudspeaker (usually measured at a midrange frequency) might not always agree with the impedance of the Loudspeaker at low frequen

25、cies where the greatest amount of power is required. Contact the Loudspeaker Manufac- turer for additional information about the actual impedance of the Loudspeaker before connecting it to the McIntosh MC75. 5. When discarding the unit, comply with local rules or regulations. Batteries should never

26、be thrown away or incinerated but disposed of in accordance with the local regulations concerning battery disposal. 6. For additional information on the MC75 and other McIntosh Products please visit the McIntosh Web Site at www.mcintosh- . Thank You Please Take A Moment Technical Assistance If at an

27、y 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 additional help concerning a suspected problem, you can receive technical assistance for a

28、ll McIntosh products at: McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-1545 Fax: 607-724-0549 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 Laborat

29、ory Service Department. For assistance 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 2009 by McIntosh Laboratory, Inc. Table of Contents Your decis

30、ion to own this McIntosh MC75 Tube Power Amplifier ranks you at the very top among discrimi- nating music listeners. You now have “The Best.” The McIntosh dedication to “Quality,” is assurance that you will receive many years of musical enjoyment from this unit. Please take a short time to read the

31、information in this manual. We want you to be as familiar as pos- sible with all the features and functions of your new McIntosh. The serial number, purchase date and McIntosh Dealer name are important to you for possible insurance claim or future service. The spaces below have been provided for you

32、 to record that information: Serial Number: _ Purchase Date: _ Dealer Name: _ Safety Instructions .2-3 Unpacking the MC75 .4-5 Thank You and Please Take a Moment .6 Technical Assistance and Customer Service .6 Table of Contents .6 General Information .6 Connector Information .7 Introduction .7 Perfo

33、rmance Features .7 Dimensions .8 Left Side Panel Connections, Right Side Panel Connections and Switch .9 How to Connect .10-11 Left Side Panel Display and Switches .12 How to Operate .13 Specifications .14 Packing Instruction .15 General Information 7 General Information, Cable Information, Introduc

34、tion and Performance Features XLR Connectors Below is the Pin configuration for the XLR Balanced Input, Input/Output Connectors on the MC75. Refer to the diagram for connection: PIN 1: Shield/Ground PIN 2: + Output PIN 3: - Output Power Control Connector The MC75 Power Control Input receives an On/O

35、ff signal from +5 to +12 volts. The Power Control Output will in turn provide a +12 volt Output Signal with a current up to 20mA. The 1/8 inch stereo mini phone plug connects to a McIntosh Preamplifier or A/V Control Center Power Control Output. Note: The Power Control Connecting Cable is available

36、from the McIntosh Parts Department: Data and Power Control Cable Part No. 170-202 Six foot, shielded 2 conductor, with 1/8 inch stereo mini phone plugs on each end. Connector and Cable Information PIN 2PIN 1 PIN 3 PIN 1PIN 2 PIN 3 Power Control Ground N/C Introduction Now you can take advantage of t

37、raditional McIntosh standards of excellence in the MC75 Tube Power Am- plifier. The 75 watt power output will drive any high quality Loudspeaker System. The MC75 reproduction is sonically transparent and absolutely accurate. The McIntosh Sound is “The Sound of the Music Itself.” Performance Features

38、 Power Output The MC75 is a Tube Power Amplifier with a capabil- ity of 75 watts into 2, 4 or 8 ohm speakers with less than 0.5% distortion. Unity Coupled Circuitry The MC75 Power Amplifier uses the famous McIn- tosh Patented Unity Coupled Circuit which provides low distortion, extended frequency re

39、sponse and cool operating output tubes. Multifilar Wound Output Transformer The MC75 Output Transformer Windings are part of the Unity Coupled Circuitry. There are two bifilar wound primaries, one for the cathodes and one for the plates. The secondary winding is wound together with the primary windi

40、ngs. This provides very close primary to secondary coupling. The result is flat fre- quency response and wide power bandwidth. Balanced and Unbalanced Input Balanced connections guard against induced noise and allow long cable runs without compromising sound quality. Sentry Monitor Tube Protection M

41、cIntosh Sentry Monitor Tube Protection Circuits ensure the MC75 will have a long and trouble free operating life. Gold Plated Connectors and Tube Socket Con- tacts Gold Plated Input Jacks and Output Binding Posts provide trouble free connections. Ceramic tube sock- ets with gold plated contacts prov

42、ide protection from atmospheric contamination. Output Tube Sockets include Air-Pipe cooling at their bases. Special Power Supply A regulated Power Supply, a very large core Power Transformer and large capacitors ensure stable noise free operation even though the power line varies. Titanium Chassis w

43、ith Super Mirror Finish The famous McIntosh Stainless Steel Chassis with Super Mirror Gold Finish ensure the pristine beauty of the MC75 will be retained for many years. INPUT IN/OUT 8 Dimensions The following dimensions can assist in determining the best location for your MC75. 16-1/2 41.91cm Front

44、 View of the MC75 Top View of the MC75 Left Side View of the MC75 Right Side View of the MC75 7-7/8 20.00cm 8-1/2 21.59cm 13-5/8 34.61cm 1-3/4 4.45cm 1-3/4 4.45cm 1-1/4 3.18cm 4-1/2 11.43cm 3-13/16 9.68cm 8-1/2 21.59cm Dimensions 9 Left Side Connections, Right Side Connections and Fuse Holder Connec

45、t the MC75 power cord to a live AC outlet. Refer to the rear panel to determine the correct voltage POWER CONTROL IN receives a turn On/Off signal from a McIntosh compo- nent POWER CONTROL OUT sends a turn On/Off signal to the next McIntosh Component BALANCED INPUT for an audio cable from a Preampli

46、fier or A/V Control Cen- ter audio output BALANCED INput1 / OUTput for an audio cable from a Pre- amplifier output or to connect an audio cable on to the next Power Amplifier input OUTPUT Connections for a 2, 4 or 8 ohm Loudspeaker Fuse holder, refer to information on the side panel of your MC75 to

47、determine the correct fuse size and rating 1 This Balanced connector may be used as an Input ONLY when connected to a McIntosh C1000 Preamplifier. For all other connections use only as an Output. UNBALANCED INPUT for an audio cable from a Preamplifier or A/V Con- trol Center audio output UNBALANCED INput2 / OUT- put for an audio cable from