Nellcor Oximax NPB-40 Operator's Manual page 49

6. If the NPB-40 detects a problem, an error tone
sounds and the NPB-40 displays an error code (Er)
and the error number (see Troubleshooting on
page 99).
7. Upon successful completion of POST, the NPB-40
sounds a one-second tone to indicate that the NPB-40
has passed the test.
WARNING: If you do not hear the POST pass tone,
do not use the NPB-40.
WARNING: Ensure that the speaker is clear of any
obstructions and that the speaker holes are not
covered. Failure to do so could result in an inaudible
alarm tone.
Note: The POST pass tone also functions as an audible
confirmation that the speaker performs properly.
NPB-40
NPB-40 Operation
41