Troubleshooting
Troubleshooting Guides
6-2 Model 42i Low Source Instruction Manual Thermo Electron Corporation
Troubleshooting
Guides
The troubleshooting guides presented in this chapter are designed to help
isolate and identify instrument problems.
Table 6-1 provides general troubleshooting information and indicates the
checks that you should perform if you experience an instrument problem.
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.
Table 6-1. Troubleshooting - General Guide
Malfunction Possible Cause Action
Does not start up No power Check that the instrument is
plugged into the proper
source (115 or 220 VAC, 50
or 60Hz).
Check instrument fuses.
Power supply Check voltages using a
digital voltmeter.
Digital electronics 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.
No output signal (or
very low output)
No sample gas reaching the
analyzer
Check input sample flow.
Blocked sample capillary Unplug power cord. Clean or
replace capillary.
No ozone reaching the reaction
chamber
Check the Instrument Control
menu to see if the ozonator
is ON. If it is ON, check dry
air supply.
No output signal Disconnected or defective input or
high voltage supply
Unplug power cord. Check
that cables are connected
properly. Check cable
resistance.
Analyzer not calibrated Recalibrate.
Defective ±15 volt Check supply voltages
(Diagnostics Menu).
Calibration drift Dryer to ozonator depleted Replace.
Line voltage fluctuations Check to see if line voltage
is within specifications.
Defective pump Rebuild pump.
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