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Routine Maintenance
Battery
6
2. Perform the electrical safety tests detailed in Safety Tests on page 26. If
the N-550B fails these electrical safety tests, refer to Troubleshooting on
page 43.
3. Inspect the fuses for proper value and rating (F1 and F2 = 2 amp,
250 volts).
Nellcor recommends replacing the N-550B's battery every two years. When
the N-550B is going to be stored for two months or more, remove the battery
prior to storage. To replace or remove the battery, refer to Disassembly Guide
on page 53.
If the N-550B has been stored for more than 30 days, charge the battery as
described in Battery Charge on page 8. A fully discharged battery requires
6 hours to receive a full charge. The battery is being charged whenever the
N-550B is plugged into an AC power source.
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