mpx200_service_manual_070-14827_draft2d.pdf

MPX 200

24-Bit

Dual Channel Processor

Service

Manual

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 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

maximum 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 ventilation 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 unit¶s connectors.

To prevent shock or fire hazard, do not expose 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 service 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 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

manufacturer's 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 interference 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 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 circuits.

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:

³How to identify and Resolve Radio/TV Interference Problems.

This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4.

Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de Ia

class B prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des Communications du Canada.

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

Lexicon

Safety Suggestions

Read Instructions Read all safety and operating

instructions before operating the unit.

Power Cord Protection 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.

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.

Nonuse Periods Unplug the power cord of the

unit from the outlet when the unit is to be left

unused for a long period of time.

Follow Instructions Follow operating and use

instructions.

Water and Moisture Do not use the unit near

water ² for example, near a sink, in a wet

basement, near a swimming pool, near an open

window, etc.

Heat Keep the unit away from heat sources such

as radiators, heat registers, stoves, etc., including

amplifiers which produce heat.

Object and liquid entry Do not allow objects to

fall or liquids to be spilled into the enclosure

through openings.

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 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.

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.

Wall or Ceiling Mounting Do not mount the unit

to a wall or ceiling except as recommended by

the manufacturer.

Damage requiring service The unit should be

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 been dropped, or the enclosure

damaged.

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

unit¶s power cord.

*Not applicable in Canada.

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 ......................................................................................................................................... 2-1

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)....................................................................................................................................... 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:............................................................................................. 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 Self 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

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