Table 5-2: Power Problems - Mallinckrodt NELLCOR NPB-4000 Service Manual

5.6.1 Power
5.6.2 Error Codes
Table 5-2 lists recommended actions to address power problems.
Condition
1. The NPB-4000/C
fails to power-up
when the
On/Standby
switch is pressed.
2. The NPB-4000/C
turns on, then
shuts off and
sounds an alarm
and no error code
is displayed.
When the NPB-4000/C detects an error condition, the monitor will attempt to
show an error code on the display screen. If such an error occurs during
monitoring operation, an audible alarm tone will sound. Press the Alarm Silence
switch to terminate the audible alarm tone.
Error codes are displayed in hexadecimal numbers. Additionally, Diagnostic
Mode may be used to gain access to an error code record, stored in non-volatile
memory, of the last 10 error codes encountered by the monitor. Refer to
Section 4 for further details on Diagnostic Mode.
Each error code corresponds to a particular problem in the monitor. Listed in the
sections that follow are recommended actions to take when an error code is
encountered.

Table 5-2: Power Problems

Recommended Action
1. Ensure power cord is plugged into operational AC
outlet of appropriate voltage and frequency. Ensure
green BATTERY CHARGING/AC SOURCE 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 ribbon cable and ensure
that it is connected to main PCB and power supply
assembly.
4. Ensure keypad is plugged into Main PCB. If
connection is good, replace keypad.
5. If the problem persists, replace main PCB.
1. Press Alarm Silence switch to terminate audible
alarm. Ensure AC power cord is connected and
green BATTERY CHARGING/AC SOURCE indicator
is lit, or ensure DC source is connected and green
BATTERY CHARGING/DC SOURCE indicator is lit.
If monitors operates successfully, battery may be
discharged.
2. Recharge battery as directed in paragraph 3.3.1. If
battery fails to hold charge, replace battery.
3. If problem persists, replace main PCB.
4. If problem persists, replace power supply assembly.
Section 5: Troubleshooting
5-3