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Troubleshooting
Troubleshooting Guides
6-2
Model 42i Trace Level Instruction Manual
Table 6–2
lists all the alarm messages you may see on the graphics display
and provides recommendations about how to resolve the alarm condition.
See
"Alarms
Menu" in the "Operation" chapter for detailed information.
Table 6–1. Troubleshooting - General Guide
Malfunction
Possible Cause
Does not start up
No power
Power Supply
Digital electronics
No output signal (or
No sample gas reaching the
very low output)
analyzer
Ruptured pump diaphragm
Blocked sample capillary
No ozone reaching the reaction
chamber
No output signal
Disconnected or defective input
or high voltage supply
Analyzer not calibrated
Defective ±15 volt
Calibration Drift
Dryer to ozonator depleted
Line voltage fluctuations
Defective pump
Unstable NO or NO
Clogged capillaries
Clogged sample air filter
Action
Check that the instrument is
plugged into the proper source
(115 or 220 VAC, 50 or 60Hz).
Check instrument fuses.
Check voltages using a digital
voltmeter.
Unplug power cord. Check that
all boards are seated properly.
Unplug power cord. Remove
one board. Install known good
board. Repeat until faulty board
is detected.
Check input sample flow.
Rebuild pump head
Unplug power cord. Clean or
replace capillary.
Check the Instrument Control
menu to see if the ozonator is
ON. If it is ON, check dry air
supply.
Unplug power cord. Check that
cables are connected properly.
Check cable resistance.
Recalibrate.
Check supply voltages
(Diagnostics menu).
Replace.
Check to see if line voltage is
within specifications.
Rebuild pump.
source
Replace.
2
Unplug power cord. Clean or
replace capillary.
Replace filter element.
Thermo Fisher Scientific
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Troubleshooting
