lexicon mpx200_service_manual_070-14827_draft2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 1999 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 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 Ordering Parts. 2-

23、1 Returning 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 Up Check:. 4-1 Normal Power Up:. 4-1 Setup. 4-1 Switch Test (8). 4-2 Encoder Test (9). 4-2 MIDI Test (10). 4-2 LED Test (11

24、). 4-3 EXIT Test (12). 4-3 I/O Test:. 4-3 Setup:. 4-3 Analog In To Analog Out Audio Test:. 4-3 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:. 4-4 Analog In To Analog Out Crosstalk Test:

25、. 4-4 Dynamic Range Test:. 4-4 Analog In To Analog Out Dynamic Range Test:. 4-4 Digital I/O Functionality. 4-5 Listening Test:. 4-5 Shock Test:. 4-5 Lexicon Audio Precision ATE Summary. 4-6 Chapter 5 Troubleshooting.5-1 Diagnostics. 5-1 Introduction. 5-1 Diagnostics Test Descriptions. 5-1 Power-On S

26、elf Tests (POST). 5-1 Pass/Fail Status:. 5-2 Diagnostic Failures: . 5-2 Power On Test Descriptions . 5-2 EXTENDED DIAGNOSTICS. 5-5 Extended Diagnostic Test Desriptions. 5-6 Service Notes:. 5-15 WARNING:. 5-15 Chapter 6 Theory of Operation.6-1 Main Board. 6-1 MPX 200 Service Manual Schematic Walkthrough.6-1 Front Panel Board.6-10 Schematic Walkthrough.6-10 Chapter 7 - Parts List.7-1 MPX200 MAIN BOARD ASSEMBLY.7-1 MPX200 FRONT PANEL BOARD ASSEMBLY .7-3 MPX200 MECHANICAL ASSEMBLY.7-3 MPX200 POWER CORD OPTIONS .7-3 MPX200 SHIPPING MATERIALS.7-4 Chapter 8 Schematics and Drawings .8-1 Schematics:.