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Troubleshooting
contact Mallinckrodt's Technical Services Department or a local Mallinckrodt representative for
assistance.
If the N-20/N-20P does not perform as expected:
•
Check for proper sensor placement.
•
Depending on concentration, indocyanine green, methylene blue, and other intravascular dyes
may affect the accuracy of a measurement.
•
These instruments are calibrated to read oxygen saturation of functional arterial hemoglobin
(saturation of hemoglobin functionally capable of transporting oxygen in the arteries), and
significant levels of dysfunctional hemoglobins such as carboxyhemoglobin or methemoglobin
may affect the accuracy of a measurement.
If the electronics and/or display functions require testing, refer to Section 3, Performance Verification.
Battery access door may not be properly latched.
Batteries may be discharged.
Batteries may be incorrectly installed.
Batteries may not be making proper electrical contact.
Fuse F1 on the auxiliary PCB may be open.
Dust may have accumulated under Measure button causing
loss of electrical contact.
4-2
Symptom 1: No response to Measure button.
Cause
Action
Check access door and ensure it is properly
latched.
Exchange them for a new set.
Ensure that batteries are oriented according
to the polarity indicator.
Inspect contacts for deformity; clean contacts
to remove oxidization.
See paragraph 4.6.5, Fuse Replacement.
Clean contact points under Measure button
(see Section 5.3, N-20 Disassembly Guide).
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