ILX Lightwave LDC-3700B Series - Page 145

CALIBRATION AND TROUBLESHOOTING
Troubleshooting
130 LDC-3700 Series
CHAPTER 5
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Open circuit error E503 or Voltage Limit error
E505 prevents output from reaching desired
value.
The LDC−3700B Series instruments have an adjustable
laser compliance voltage. Check to see if the LASER
voltage limit setting is too low (see Chapter 2). Check laser
connections.
TE Controller
Power on, but no TE current output If TE MODULE OPEN indicator is lit, check the load
connections.
Check that pins 14 and 15 of the output connector are not
connected. See Boosting the TE Controller on page 34.
Power on, but temperature is not controlled If SENSOR OPEN indicator is lit, check the sensor
connections.
Check that the rear panel SENSOR SWITCH position is
set for the proper sensor type.
Check that C1 and C2 and C3 are correct values for your
temperature sensor.
Check that the GAIN setting is not too low and that the LIM
I
TE
value is not too low for your thermal load.
Unable to adjust output or parameter Check the (ADJUST)TEC indicator, the indicator must be
lit for any TEC adjustments to be made.
Check the MODE or DISPLAY indicators. If they do not
respond to a switch, the unit may be in measurement
calibration mode. Cycle the power switch to abort this
mode.
Output goes off intermittently 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.
Check the TE module connections. A high impedance on
the TE load may cause the output to exceed the
compliance voltage momentarily, thus shutting the output
off.
Table 5.3 Symptoms and Actions
Symptom Corrective Actions
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