Nellcor OxiMax N-550 Service Manual page 20

Performance Verification
10
3. The N-550 automatically starts the Power-On Self-Test (POST), which
tests N-550 circuitry and functions.
CAUTION: During POST (immediately after power-up), confirm that all
display segments and indicators light, and the speaker sounds a
one-second pass tone.
4. While performing POST, the self-test display appears for approximately
five seconds. During this time:
• All indicators illuminate
• All segments of all numeric digits light and change from red to green
• All segments of the Pulse Amplitude Display light
• All segments of the SatSeconds indicator light