lexicon mpx110_service_manual_d#5C4电路图.pdf

《lexicon mpx110_service_manual_d#5C4电路图.pdf》由会员分享，可在线阅读，更多相关《lexicon mpx110_service_manual_d#5C4电路图.pdf（75页珍藏版）》请在收音机爱好者资料库上搜索。

1、Lexicon 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 Instructi

2、ons 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,

3、the 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 ma

4、nufacturer. 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 Prot

5、ection 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

6、 outlet 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

7、enclosure 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

8、 serviced 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 b

9、een dropped, or the enclosure damaged. RadioFans.CN 收音机爱 好者资料库 MPX 110 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 els

10、ewhere 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 be connect

11、ed 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 electrical

12、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. Operation of any e

13、lectrical 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 with power c

14、able 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 person, capabl

15、e 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, such as the

16、 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 SYMBOLS Gen

17、eral 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. (Terminal

18、s 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 The CAUTION

19、 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 attention to proc

20、edure, 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 use. Avoid

21、 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-free works

22、tation.* 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, wash with

23、 a solution of Lux liquid detergent, and allow drying without rinsing. RadioFans.CN 收音机爱 好者资料库 MPX 110 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

24、 Periodic Maintenance.2-1 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.4-1 Power up.4-1 Setup .4-1 Encoder Test .4-2 Switch/LED Test.4-2 ACD Pot Test.4-2 midi

25、 wraparound test .4-3 listening test.4-3 Effects listening test.4-3 shock test.4-3 Audio Performance:.4-3 setup.4-3 gain test.4-4 signal-to-noise test.4-4 thd+n.4-4 frequency response test .4-4 Lexicon Audio Precision ATE Summary.4-5 Chapter 5 Troubleshooting.5-1 Diagnostics.5-1 Introduction.5-1 DIA

26、GNOSTICS TEST DESCRIPTIONS.5-1 Power On Diagnostics .5-1 Diagnostic Failures.5-2 ROM Checksum Test (1).5-2 SRAM Test (2).5-2 Lexichip3 WCS Test (3).5-3 Lexichip3 Interrupt Timer Test (4).5-3 Lexichip3 Audio Data File Test (5).5-4 EEPROM Checksum (8).5-4 EXTENDED DIAGNOSTICS.5-5 ROM Checksum Test (1)

27、.5-6 SRAM Test (2).5-7 Lexichip3 WCS Test (3).5-7 Lexichip3 Interrupt Timer Test (4).5-8 Lexichip3 Audio Data File Test (5).5-8 Encoder/Switch/LED Test (6) .5-9 RadioFans.CN 收音机爱 好者资料库 MPX 110 Service Manual ADC Pot Test (7) .5-11 EEPROM Checksum (8).5-12 MIDI Tests (9).5-13 LED Test (10) .5-14 Lexichip3 External DRAM Test (11).5-14 Burn In Loop (12).5-15 Audio I/O (13) .5-16 Exit Diagnostics (14).