Lightwave Communications LDX-3232 manual Troubleshooting Guide, General, Laser Current Source

CA LI BRATION AND TR OUBLESHOOTING

Troubleshooting Guide

Troubleshooting Guide

C H A P T E R 6

This section is a guide to troubleshooting the LDX-3232 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	Corrective Actions
GENERAL
LDX-3232 unit will not power up	Check AC power line voltage and power cord connection.
Power on, but display is frozen	This may occur if the instrument loses power (AC line) briefly.
and switches don’t operate	turn the power switch off and on again to restart.
Displays E514 on power up on	Hold (GPIB) LOCAL button, RANGE button and FINE button as
display	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.
Instrument resets at power up or	Hold (GPIB) LOCAL button, RANGE button and FINE button as
any LASER mode change	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.
LASER CURRENT SOURCE
Power on, but no current output	Check interlock pins on LASER input connector on instrument
	rear panel; these pins must be shorted either directly or though
	a switch.
	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.
Output current at limit; can’t be	If POWER mode is used, check the monitor diode (feedback)
lowered	connections; try reversing the polarity of the monitor
	photodiode; also check the photodiode bias adjustment on the
	rear panel.
	If in I or IHBW mode, check the current setpoint and I LIMIT
	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.
Output goes off intermittently	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.

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