Table 6-1. Troubleshooting - General Guide - Thermo Scientific 42i Instruction Manual

Troubleshooting
Troubleshooting Guides
6-2 Model 42i 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
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
Excessive Noise Defective or low sensitivity
PMT
Defective input board
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.
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.
Unplug power cord. Remove
PMT. Install known good PMT.
Plug in power cord. Check
performance.
Replace board.
Thermo Fisher Scientific