Troubleshooting - THORLABS LDC200C series Operation Manual

LDC200C Series

4.3 Troubleshooting

In case that your LDC200C Series Controller shows malfunction please check the following
items:
q Unit does not work at all (no display at the front):
o LDC2xxC connected properly to the mains?
§ Check the power cord and the
o LDC2xxC turned on?
§ Turn on your LDC200C Series Controller (button "LINE" F10).
o Check the fuses
§ If blown, replace the fuses with the correct type.
q The desired laser output power cannot be achieved
o Is the interlock closed?
§ Check the connection of
o Is the laser output turned on ("LASER ON" button)?
§ Change the setting from "OFF" to "ON". The LED "ON" on the front panel of the
mainframe must light up.
o Is the current limit I
§ Adjust the
appropriate value.
o Is the laser diode installed properly?
§ Check the connection cable.
o Is the polarity of the laser diode set correctly?
§ If not change the polarity of the diode or select on the LDC2xxC the
.
12
o Is the photodiode connected properly?
§ Check the connection cable.
o Is the photodiode poled correctly?
§ If in constant power mode the displayed photodiode current is negative, the polarity
of the photodiode must be reverted.
o Are you using a
§ Change the polarity of the diode for photo element mode or change the polarity of the
bias voltage source.
o Is the desired output power set correctly?
§ Check the optical
§ Adjust the desired output power P
22
at the rear panel.
21
interlock
set to 0?
LIM
hardware limit I
14 LIM
bias voltage with the photodiode in photo current mode?
12
power display calibration
line voltage setting
pins of the connector jack.
13
(potentiometer on the front panel) to an
14
16
using the tuning knob.
LD
20
opposite polarity
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