Power - Nellcor OXIMAX N-600X Series Service Manual

Troubleshooting

Power

Power problems are related to AC and/or DC power issues. Use the following
recommended actions to correct power problems.
Symptom
Low Battery indicator
lights steadily while
oximeter is connected to
AC and the battery is not
discharged.
The oximeter generates an
error code when
disconnected from AC
power, and the oximeter is
powered up.
Low Battery indicator on
during DC operation and
an alarm is sounding.
Battery does not charge.
152
Table 27. Power Problems
Recommended Corrective Action
•
Ensure the oximeter is plugged into an operational AC
outlet and the AC indicator is lit.
•
Check the external fuses. The fuses are located in the Power
Entry Module as indicated in Fuse Replacement, page 166.
Replace if necessary.
•
Open the oximeter as described in Disassembling the
Oximeter, page 167. Check the internal battery fuse F3 and
replace if necessary.
•
If the oximeter is still experiencing power problems, install a
new battery and verify the charging voltage output to the
battery while on AC power when first turning on the
oximeter. The charging voltage increases to 7.05 - 7.35 volts
if the battery is good. The charging voltage decreases over
time. Replace the power supply if the above charging
values are not met. See Replacing the Power Supply, page
175.
•
Check the harness connection from the bottom enclosure
to the Main Board PCB, as instructed in Main Board PCB
Replacement, page 179. If the connection is good, replace
the Main Board PCB.
•
The battery may be discharged. To recharge the battery,
refer to Using Battery Power, page 51. The oximeter may be
used with a less than fully charged battery but with a
corresponding decrease in operating time from that charge.
The battery may be defective.
•
There are less than 15 minutes remaining of usable charge
left on the battery before the oximeter shuts off. If possible,
cease using battery power. Connect the oximeter to an AC
source and allow it to recharge. A full recharger takes
approximately eight hours. If continuing to use the
oximeter as it recharges, a full battery recharge takes 12
hours.
•
Replace battery if it is more than two years old.
•
If the battery fails to hold a charge, replace the battery as
indicated in Battery Replacement, page 170.
•
Open the oximeter as described in Top Case Assembly
Replacement, page 183. Replace a new battery and verify
the charging voltage output to the battery while on AC
when first turning the oximeter ON. The charging voltage
will climb between 7.05 to 7.35 volts. Since the battery is
good, the charging voltage will decrease with time. Replace
power supply if above values are not met.
10030881 Rev. B 12-2008
Service Manual