Troubleshooting Guide - ILX Lightwave LDX-32420 User Manual

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C H A P T E R

Troubleshooting Guide

This section is a guide to troubleshooting the LDX-32420 Current Sources. Some
of the more common symptoms are listed here, and the appropriate
troubleshooting actions are given. We recommend that the user start at the
beginning of this guide. Read the symptom descriptions, and follow the steps for
the corrective actions that apply. If you encounter problems that are beyond the
scope of this guide, contact your ILX Lightwave customer service representative.
Symptom
GENERAL
LDX-32420 unit will not power up
Power on, but display is frozen
and switches don't operate
Displays E514 on power up on
display
Instrument resets at power up or
any LASER mode change
LASER CURRENT SOURCE
Power on, but no current output
Output current at limit; can't be
lowered
Output goes off intermittently
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 LDX-32420
C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Troubleshooting Guide
Corrective Actions
Check AC power line voltage and power cord connection.
This may occur if the instrument loses power (AC line) briefly.
turn the power switch off and on again to restart.
Hold (COM) LOCAL button, RANGE button and FINE button as
you are powering up the instrument. This clears the laser board
EEPROM, LLLLL will be displayed on the display; the laser
current source must be recalibrated.
Hold (COM) LOCAL button, RANGE button and FINE button as
you are powering up the instrument. This clears the laser board
EEPROM, LLLLL will be displayed on the display; the laser
current source must be recalibrated.
Check interlock pins on the instrument rear panel; Interlock 1
must be shorted either directly or though a switch; Interlock 2
must be open or pulled TTL High.
If OPEN CIRCUIT indicator is lit, check the load connections
and then try again.
Check the OUTPUT ON switch, the corresponding LED should
be lit.
If POWER mode is used, check the monitor diode (feedback)
connections; try reversing the polarity of the monitor
photodiode; also check the photodiode bias adjustment on the
rear panel.
If in I or I mode, check the current setpoint and I LIMIT
HBW
setting; setting the output below the limit may require several
turns of the adjust know if the setpoint is much greater than the
desired limit setting.
Check the interlock circuit; an intermittent interlock will turn the
output off.
Check that the AC power cord connection is secure; power line
drop-outs may reset the unit and when power is restored, the
output will be off.