lexicon_mc-12电路图.pdf

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1、MC-12 / MC-12 Balanced Music and Cinema Processors Service Manual RadioFans.CN 收音机爱 好者资料库 MC-12 / MC-12 Balanced Service Manual Precautions Save these instructions for later use. Follow all instructions and warnings marked on the unit. Always use with the correct line voltage. Refer to the manufactu

2、rers operating instructions for power requirements. Be advised that different operating voltages may require the use of a different line cord and/or attachment plug. Do not install the unit in an unventilated rack, or directly above heat producing equipment such as power amplifiers. Observe the maxi

3、mum ambient operating temperature listed in the product specification. Slots and openings on the case are provided for ventilation; to ensure reliable operation and prevent it from overheating, these openings must not be blocked or covered. Never push objects of any kind through any of the ventilati

4、on slots. Never spill a liquid of any kind on the unit. This product is equipped with a 3-wire grounding type plug. This is a safety feature and should not be defeated. Never attach audio power amplifier outputs directly to any of the units connectors. To prevent shock or fire hazard, do not expose

5、the unit to rain or moisture, or operate it where it will be exposed to water. Do not attempt to operate the unit if it has been dropped, damaged, exposed to liquids, or if it exhibits a distinct change in performance indicating the need for service. This unit should only be opened by qualified serv

6、ice personnel. Removing covers will expose you to hazardous voltages. This triangle, which appears on your component, alerts you to the presence of uninsulated, dangerous voltage inside the enclosure voltage that may be sufficient to constitute a risk of shock. CAUTION RISK OF ELECTRIC SHOCK DO NOT

7、OPEN This triangle, which appears on your component, alerts you to important operating and maintenance Instructions in this accompanying literature. Notice This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufact

8、urers instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules, which are designated to provide reasonable protection against such i

9、nterference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment OFF and ON, the user is encouraged to

10、try to correct the interference by one or more of the following measures: Reorient the receiving antenna Relocate the computer with respect to the receiver Move the computer away from the receiver Plug the computer into a different outlet so that the computer and receiver are on different branch cir

11、cuits. If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet prepared by the Federal Communications Commission helpful: “How to identify and Resolve Radio/TV Interference Problems This bookle

12、t is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4. Le prsent appareil numrique nmet pas de bruits radiolectriques dpassant les limites applicables aux appareils numriques de Ia class B prescrites dans le Rglement sur le brouillage radiolectrique

13、 dict par le ministre des Communications du Canada. Copyright 2002 Lexicon, Inc. All Rights Reserved Lexicon Inc. 3 Oak Park Bedford, MA 01730-1441 Tel (781) 280-0300 Customer Service Fax (781) 280-0499 Lexicon Part # 070-14828 Rev 0 Printed in the United States of America RadioFans.CN 收音机爱 好者资料库 Le

14、xicon Safety Suggestions Read Instructions Read all safety and operating instructions before operating the unit. Retain Instructions Keep the safety and operating instructions for future reference. Heed Warnings Adhere to all warnings on the unit and in the operating instructions. Follow Instruction

15、s Follow operating and use instructions. Heat Keep the unit away from heat sources such as radiators, heat registers, stoves, etc., including amplifiers which produce heat. Ventilation Make sure that the location or position of the unit does not interfere with its proper ventilation. For example, th

16、e unit should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a cabinet which impedes the flow of air through the ventilation openings. Wall or Ceiling Mounting Do not mount the unit to a wall or ceiling except as recommended by the manu

17、facturer. Power Sources Connect the unit only to a power supply of the type described in the operating instructions, or as marked on the unit. Grounding or Polarization* Take precautions not to defeat the grounding or polarization of the units power cord. *Not applicable in Canada. Power Cord Protec

18、tion Route power supply cords so that they are not likely to be walked on or pinched by items placed on or against them, paying particular attention to cords at plugs, convenience receptacles, and the point at which they exit from the unit. Nonuse Periods Unplug the power cord of the unit from the o

19、utlet when the unit is to be left unused for a long period of time. Water and Moisture Do not use the unit near water for example, near a sink, in a wet basement, near a swimming pool, near an open window, etc. Object and Liquid Entry Do not allow objects to fall or liquids to be spilled into the en

20、closure through openings. Cleaning The unit should be cleaned only as recommended by the manufacturer. Servicing Do not attempt any service beyond that described in the operating instructions. Refer all other service needs to qualified service personnel. Damage Requiring Service The unit should be s

21、erviced by qualified service personnel when: the power supply cord or the plug has been damaged; objects have fallen or liquid has been spilled into the unit; the unit has been exposed to rain; the unit does not appear to operate normally or exhibits a marked change in performance; the unit has been

22、 dropped, or the enclosure damaged. RadioFans.CN 收音机爱 好者资料库 MC-12/MC-12 Balanced Service Manual SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service and repair of this instrument. Failure to comply with these precautions or with specific wa

23、rnings elsewhere in these instructions violates safety standards of design manufacture and intended use of the instrument. Lexicon assumes no liability for the customers failure to comply with these requirements. GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cabinet must

24、be connected to an electrical ground. The instrument is equipped with a three-conductor AC power cable. The power cable must either be plugged into an approved three-contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly connected to an e

25、lectrical ground (safety ground) at the power outlet. The power jack and mating plug of the power cable meet International Electrotechnical Commission (IEC) safety standards. DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes. Operatio

26、n of any electrical instrument in such an environment constitutes a definite safety hazard. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified maintenance personnel. Do not replace components wi

27、th power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power and discharge circuits before touching them. DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another pers

28、on, capable of rendering first aid and resuscitation, is present. DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. DANGEROUS PROCEDURE WARNINGS Warnings, s

29、uch as the example below, precede potentially dangerous procedures throughout this manual. Instructions contained in the warnings must be followed. WARNING Dangerous voltages, capable of causing death, are present in this instrument. Use extreme caution when handling, testing and adjusting. SAFETY S

30、YMBOLS General definitions of safety symbols used on equipment or in manuals. Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument. Indicates dangerous voltage.

31、 (Terminals fed from the interior by voltage exceeding 1000 volts must be so marked.) WARNING The WARNING sign denotes a hazard. It calls attention to a procedure, practice, condition or the like which, if not correctly performed or adhered to, could result in injury or death to personnel. CAUTION T

32、he CAUTION sign denotes a hazard. It calls attention to an operating procedure, practice, condition or the like which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. NOTE: The NOTE sign denotes important information. It calls attenti

33、on to procedure, practice, condition or the like which is essential to highlight. CAUTION Electrostatic Discharge (ESD) Precautions The following practices minimize possible damage to ICs resulting from electrostatic discharge or improper insertion. Keep parts in original containers until ready for

34、use. Avoid having plastic, vinyl or styrofoam in the work area. Wear an antistatic wrist-strap. Discharge personal static before handling devices. Remove and insert boards with care. When removing boards, handle only by non-conductive surfaces and never touch open-edge connectors except at a static-

35、free workstation.* Minimize handling of ICs. Handle each IC by its body. Do not slide ICs or boards over any surface. Insert ICs with the proper orientation, and watch for bent pins on ICs. Use static shielding containers for handling and transport. To make a plastic-laminated workbench anti-static,

36、 wash with a solution of Lux liquid detergent, and allow drying without rinsing. Lexicon Table of Contents Chapter 1 Reference Documents, Required Equipment.1-1 Reference Documents. 1-1 Required Equipment. 1-1 Tools. 1-1 Test Equipment. 1-1 Chapter 2 General Information.2-1 Periodic Maintenance. 2-1

37、 Ordering Parts. 2-1 Returning Units to Lexicon for Service . 2-1 Chapter 3 Specifications.3-1 Chapter 4 Performance Verification.4-1 Functional Tests. 4-1 Initial inspection . 4-1 Power Supply Test. 4-1 Setup. 4-2 Audio Tests I/O. 4-2 Audio Performance Verification. 4-10 Audio Inputs RCA #1 Left an

38、d Right to all Left and Right RCA/XLR Outputs Tests . 4-10 All Remaining Audio RCA Inputs Left and Right to Front Left and Right RCA Output Tests . 4-11 Audio Inputs RCA #1 Left and Right to Zone 2 Left and Right RCA Fix /Var Outputs and Zone 2 XLR Outputs Tests. 4-12 Audio Inputs RCA #1 Left and Ri

39、ght to Record Left and Right RCA Fix /Var Outputs Tests. 4-13 All Digital Audio Inputs Coax, Optical, AES/EBU to the Left and Right Front RCA Outputs Tests . 4-13 Video Input / Output Tests. 4-14 Composite Inputs to Composite (Main and Record) Outputs Tests. 4-14 S-Video Inputs to S-Video (Main and Record) Outputs Tests. 4-15 Component Inputs to Component Output Tests. 4-16 Lexicon Audio Precision ATE Summary . 4-17 Chapter 5 Troubleshooting.5-1 V1.00 Release Notes. 5-1 Diagnostics. 5-2 Introduction. 5-2 DiagnosticS Categories .