Troubleshooting
Troubleshooting Guides
5-2 Model 49i Primary Standard Instruction Manual Thermo Fisher Scientific
Troubleshooting
Guides
The troubleshooting guides presented in this chapter are designed to help
isolate and identify instrument problems.
Table 5-1 provides general troubleshooting information and indicates the
checks that you should perform if you experience an instrument problem.
Table 5-2 lists all the alarm messages you may see on the graphics display
and provides recommendations about how to resolve the alarm condition.
Table 5-1. 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 volts)
Check instrument fuses
Power supply Check power supply voltages
using a voltmeter
Cell A or B
frequency high
Light adjustment Readjust Lamp Setting.
From the Service Mode
menu choose Lamp Setting.
Defective detector Interchange detectors at
Measurement Interface
Board connectors to
determine if detector is
defective.
Cell A and B frequency
high
Lamp supply Check for 1.7 volt peak to
peak waveform at lamp
current check point on Lamp
Power Supply Board
Cell A or B frequency
low or zero
Light adjustment Readjust lamp setting. From
the Service Mode menu
choose Lamp Setting.
One cell excessively contaminated Clean cell
Defective detector Interchange detectors at
Measurement Interface
Board connectors to
determine if detector is
defective
Cell A and B frequency
low or zero
Dirty cells Clean cells
Light adjustment Check for 1.7 volt peak to
peak waveform at lamp
current check point on Lamp
Power Supply Board
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