4-1
4 Troubleshooting
4.1 Introduction
In this chapter, problems are listed along with possible causes and recommended corrective
actions. Refer to the tables to check the pulse oximeter, identify and eliminate the troubles.
The troubles we list here are frequently arisen difficulties and the actions we recommend can
correct most problems, but not all of them. For more information on troubleshooting, contact
our Customer Service Department.
4.2 Part Replacement
Printed circuit board (PCB) assemblies, major parts and components of the pulse oximeter
are replaceable. Once you isolate a suspected PCB, follow the instructions in 5 Repair and
Disassembly to replace the PCB with a known good one. Check that the trouble symptom
disappears or the pulse oximeter passes all performance tests. Defective PCB assembly can
be sent to us for repair. If the trouble symptom persists, swap the replacement PCB and the
suspected malfunctioning PCB (the original PCB that was installed when you start
troubleshooting) and continue troubleshooting as directed in this chapter.
To obtain information on replacement parts or order them, refer to parts by the part names
and part number listed in 6 Parts.
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