Lexicon 200, Service Manual

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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
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 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 ..........................................................................................................................................4-4
Analog In To Analog Out Crosstalk Test...............................................................................................4-4
Dynamic Range Test................................................................................................................................4-5
Analog In To Analog Out Dynamic Range Test ....................................................................................4-5
Digital I/O Functionality ............................................................................................................................4-5
Listening Test ...........................................................................................................................................4-5
Shock Test ...............................................................................................................................................4-5
Lexicon Audio Precision ATE Summary...................................................................................................4-7
Chapter 5 Troubleshooting ......................................................................... 5-1
Diagnostics...............................................................................................................................................5-1
Introduction ...........................................................................................................................................5-1
Diagnostics Test Descriptions ..............................................................................................................5-1
Power-On Self Tests (POST) ...............................................................................................................5-1
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