lexicon MPX200_Service_Manual_070-14827_Rev0电路图.pdf

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1、MPX 200 24-Bit Dual Channel Processor Service Manual RadioFans.CN 收音机爱 好者资料库 Product Name 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 manufacturers operating instruct

2、ions 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 maximum ambient operating t

3、emperature 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 ventilation slots. Never spill a

4、 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 the unit to rain or moi

5、sture, 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 service personnel. Removing

6、 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 OPEN This triangle, whi

7、ch 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 manufacturers instructions, may

8、 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 interference in a reside

9、ntial 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 try to correct the inte

10、rference 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 circuits. If necessary, th

11、e 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 booklet is available from th

12、e 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 dict par le ministre

13、des Communications du Canada. Copyright 2001 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 # 070-14827 Rev 0 Printed in the United States of America RadioFans.CN 收音机爱 好者资料库 Lexicon Safety Suggestio

14、ns 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 Instructions Follow operating and

15、 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, the unit should not be s

16、ituated 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 manufacturer. Power Source

17、s 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 Protection Route power suppl

18、y 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 outlet when the unit is

19、 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 enclosure through openin

20、gs. 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 serviced by qualified s

21、ervice 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 dropped, or the encl

22、osure damaged. RadioFans.CN 收音机爱 好者资料库 MPX 200 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 warnings elsewhere in these instruct

23、ions 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 be connected to an electrical grou

24、nd. 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 electrical ground (safety ground) a

25、t 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. Operation of any electrical instrument in

26、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 with power cable connected. Under ce

27、rtain 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 person, capable of rendering first aid

28、 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, such as the example below, precede

29、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 SYMBOLS General definitions of safe

30、ty 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. (Terminals fed from the interior

31、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 The CAUTION sign denotes a hazard.

32、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 attention to procedure, practice, conditi

33、on 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 use. Avoid having plastic, vinyl o

34、r 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-free workstation.* Minimize handli

35、ng 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, wash with a solution of Lux liqui

36、d detergent, and allow drying without rinsing. MPX 200 Service Manual 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 Ordering Parts.2-1 Ret

37、urning Units to Lexicon for Service.2-1 Chapter 3 Specifications.3-1 Chapter 4 Performance Verification.4-1 Initial Inspection.4-1 Functional Tests.4-1 Initial Power On Check .4-1 Normal Power Up .4-1 Setup .4-1 Lexichip3 ADF Test (5).4-2 DRAM Test (7).4-2 Switch Test (8).4-2 Encoder Test (9).4-3 MIDI Test (10).4-3 LED Test (11) .4-3 EXIT Test (12) .4-3 I/O Test.4-3 Setup .4-4 Analog In To Analog Out Audio Test .4-4 Frequency Response .4-4 Analog In To Analog Out Frequency Response Test .4-4 THD+N Measurement .4-4 Analog In To Analog Out THD+N Test .4-4 Crosstalk Test .