Section 4: Troubleshooting
4- 2
4.6 TROUBLESHOOTING GUIDE
If you encounter a problem that cannot be resolved through a visual
inspection, refer to Table 4-1 which provides a list of symptoms, probable
causes, and recommended actions to take to correct the problem. It is
recommended that corrective actions be performed in the order presented.
For a symptom that is not listed in Table 4-1, contact the Nellcor Puritan
Bennett Technical Services Department or your local Nellcor Puritan Bennett
representative.
If an error code is shown on the front panel LCD display, as shown in Figure
4-1, turn the NPB-40 off and back on again. If the error code still persists,
refer to Table 4-2 for the indicated failure and corrective action.
Figure 4-1: Typical Error Code Display
Once you have performed the recommended action, reassemble the NPB-40,
refer to Section 3, Performance Verification, and conduct a performance
verification before returning the NPB-40 to service. If the symptom persists,
continue troubleshooting.
Table 4-1: Troubleshooting Guide
Symptom Probable Cause Corrective Action
The unit does not
turn on when the
On/Off key is
pressed.
The batteries are
missing.
Open the battery compartment
and if batteries are missing,
install new batteries.
The batteries are
installed incorrectly
or are backwards.
Open the battery compartment
and if batteries are not installed
correctly, remove and reinstall
the batteries.
(Continued on next
page)
The batteries are at
or near a voltage too
low for the NPB-40 to
operate.
Install new batteries.
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