Chapter 5 Troubleshooting; Diagnostics; Introduction; Diagnostics Test Descriptions - Lexicon MPX 110 Service Manual

Chapter 5 Troubleshooting

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http://www.lexicon.com
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http://www.lexicon.com/kbase/index.asp

Diagnostics

INTRODUCTION

This document contains the complete diagnostics descriptions for the Lexicon MPX 110 product.

DIAGNOSTICS TEST DESCRIPTIONS

There are two categories of diagnostics that exist in the MPX 110 software: (1) Power On (automatic)
Diagnostics and (2) Functional Tests/Extended Diagnostics. As you might expect, the Power Up
Diagnostics will be executed automatically everytime the system is powered on. The Functional
Tests/Extended Diagnostics will be invoked by pressing and holding down the BYPASS button while
powering on the unit until the green level leds stay on.

POWER ON DIAGNOSTICS

Upon normal power on, all of the Front Panel LED's will be turned on for approximately 200ms, and then
the MPX 110 will attempt to run the sequence of diagnostic tests listed in table 1 below. These diagnostic
tests have been designed to take less than 10 seconds.
During the execution of the Power On Diagnostics, the CPU (wherever possible) will display a test code on
the EDIT, BYPASS, STORE & TAP LED's prior to the execution of the test (provided the LED's are
functioning properly).
Throughout this document, Edit, Bypass, Store, and Tap LED's will be referred to as the Binary LED's.
These LED's are used to display the binary value of the corresponding test number. This value is sent to
the Binary LED's before each test is executed. Displaying the test/error code on the LED's before the test is
executed, makes it possible to determine which test failed if the unit hangs or crashes during the test.
Test No. Test
1 ROM Checksum
2 SRAM
3 Lexichip3 WCS
4 Lexichip3 Interrupt Timer
5 Lexichip3 Audio Data File
6 EEPROM Checksum
When the Power On Diagnostic tests have completed, the software version will flash on the Front Panel
Binary LED's for approximately two seconds.
Note: The Binary LED's are interrupt driven. Therefore, the ROM,SRAM, LEXICHIP 3 & CPU must
be working properly in order for the Binary LED's to operate correctly.
Edit Bypass
O O
O O
O O
l
O
l
O
l
O
Table 1.
Lexicon
Store Tap
l
O
l
O
l l
O O
l
O
O O
5-1