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M
AINTENANCE AND
Calibration and Line Voltage Selection require opening the case and exposure to
potentially lethal voltages. These procedures are to be performed by qualified
service personnel only. Consult the factory for service instructions.
Troubleshooting
This appendix is a guide to troubleshooting the LDT-5412. 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 which
apply. If you encounter problems which are beyond the scope of this
troubleshooting guide, contact ILX Lightwave at the number listed at the front of
this manual. Our Service Engineers will be glad to answer any questions
concerning this or any other ILX Lightwave product.
Table 3.1 Troubleshooting Symptoms and Actions
SYMPTOM
LDT-5412 will not power up.
LDT-5412 powers up, but OUTPUT
won't come on or OPEN THERM
light stays lit.
After setting the SET Resistance,
ACTUAL Resistance values diverge
from the set value.
ACTUAL Resistance values
oscillate greatly around the SET
Resistance value.
T
ROUBLESHOOTING
CORRECTIVE ACTIONS
•
Check AC Power line voltage and power cord connection.
•
Check the SET RESISTOR switch. If it is in EXT position, there must
be an external resistor connected across pins 5 and 6 of the TE
OUTPUT connector (J301). Otherwise, set it to INT.
•
Check the thermistor connections to be sure they are not open.
•
Reverse the polarity on the leads of the TE module.
•
Reduce the GAIN control slightly by turning thecontrol counter-
clockwise (CCW).
•
Check the THERMISTOR CURRENT setting. If the temperature is out
of range for the thermistor current, the resistance may be erratic.
3
C H A P T E R
17
LDT-5412
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