Table 14. Power Problems - Nellcor OxiMax N 5500 Service Manual

5.5.1 Power
Power problems are related to AC and/or DC. Table 14 lists recommended actions to
address power problems.
Symptom
1. When AC power
cord is connected to
the N5500, AC power
indicator on the front
panel is not lit.
2. The N5500 fails to
power-up when the
Power On/Off switch
is pressed.
3. The N5500 turns on,
then sounds an alarm
and shuts off and no
error code is displayed.
4. The N5500 does not
operate when
disconnected from AC
power
5. Battery does not
charge

Table 14. Power Problems

1. Ensure power cord is plugged into appropriate AC outlet of
voltage and frequency.
2. Replace Power Supply assembly.
3. Ensure Power Switch PCB is plugged into Main PCB
assembly. If connection is good, replace Power Switch PCB
1.Ensure power cord is plugged into operational AC outlet of
appropriate voltage and frequency. Ensure AC power
indicator is lit. If indicator is not lit, replace Power Supply
assembly.
2.Check fuses located on Power Supply assembly above AC
inlet receptacle. Replace fuses if necessary.
3.Inside monitor, check main flat cable and ensure that it is
connected to Main PCB assembly and Rear communication
PCB assembly.
4.Inside monitor, check SMPS to Rear communication board
DC wire connected to SMPS and Rear communication PCB.
5.Ensure Power Switch PCB is plugged into Main PCB
assembly. If connection is good, replace Power Switch PCB.
6.If the problem persists, replace Main PCB assembly.
7.If the problem persists, replace Power switch PCB.
1. If problem persists, replace Main PCB assembly.
1. The battery may be discharged. To recharge the battery,
refer to section 3.3.1 Battery Charge.
Note: DC power should not charge the battery. The
monitor 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.
2. If problem persists, replace battery fuse on Power Supply.
1. If the battery fails to hold a charge, replace the battery as
indicated in Battery Replacement
2. Open the monitor as described in Disassembly Guide.
Verify the power supply's LED while on AC. While
charging battery, the red LED is lit until battery charging is
completed, then the green LED is lit. Replace the power
supply if the LEDs are not lit.
N5500 Service Manual
Troubleshooting
Recommended Action
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