Thermo Scientific 42iQTL, Instruction Manual

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Troubleshooting
Troubleshooting Guide
6-4 42iQTL Instruction Manual Thermo Scientific
Problem Possible Cause Action
If using sample particulate filter,
make sure it is not blocked.
Disconnect sample particulate
filter from the sample bulkhead. If
flow increases, replace the filter.
Flow high When delivering zero air or gas to
the instrument, use an atmospheric
dump.
Flow = 0 LPM Check that Step POL board #1 has
both dip switch settings of SW2 off
(both facing the rear of the
instrument). Verify the pump is
plugged into the Step POL board.
Worn Diaphragm Rebuild pump every 12 months or
as needed.
Alarm – Ozonator Flow Ozone flow low Check ozone capillary for blockage.
Replace as necessary.
Alarm – NO, NO
2
, NO
x
Concentration
Concentration has
exceeded range limit Check to ensure range corresponds
with expected value. If not, select
proper range.
Check user-defined low set point;
set to zero.
Alarm – Board
Communication Cable connection Check that DMC cable is connected
properly. Reseat if needed.
Defective DMC PCB Replace DMC board.
Alarm – Power Supply Cable connection Check that DMC cable is connected
properly. Reseat if needed.
Defective component Check for other alarms, as it is
possible that another component of
that DMC is drawing too much
current.
Defective DMC PCB Replace DMC board.
Alarm – Module
Temperature Cable connection Check that DMC cable is connected
properly. Reseat if needed.
Other alarm Make sure the instrument
temperature is not too high or in
alarm.
Defective DMC PCB Replace DMC board.
Alarm – 5V/24V Step Board Cable connection Check the cable connections to
that Step POL board.
Alarm – Analog I/O Defective PCB Replace Analog board.
Alarm – Digital I/O Defective PCB Replace Digital board.