Covidien Nellcor OxiMax N-560, Service Manual

Page: 58 / 158

Troubleshooting
48
Operational Performance
Table 9 lists symptoms of problems relating to operational performance (no
error codes displayed) and recommended actions. If the action requires
replacement of a PCB or module, refer to
Disassembly Guide
on page 53.
An alarm condition
exists but no alarm
(audible or visual) is
indicated.
Replace the Front Panel PCB. Refer to Front Case
Disassembly on page 57.
Table 8: Display/Alarms Problems (Continued)
Symptom Recommended Action
Table 9: Operational Performance Problems
Symptom Recommended Action
The
Pulse Amplitude
indicator seems to
indicate a pulse, but the
digital displays show
zeroes.
The sensor may be damaged; replace it.
Replace the Front Panel PCB. Refer to
Front Case
Disassembly on page 57.
SpO
2
or pulse values
change rapidly;
Pulse
Amplitude
indicator is
erratic.
The sensor may be damp or may have been reused too
many times. Replace it.
• An electrosurgical unit (ESU) may be
interfering with performance:
• Move the N-560 and its cables and sensors as
far from the ESU as possible.
• Plug the N-560 power supply and the ESU
into different AC circuits.
• Move the ESU ground pad as close to the
surgical site as possible and as far away from
the sensor as possible.
• Verify the performance with the procedures
detailed in
Performance Verification
on
page 7.
• Replace the Front Panel PCB. Refer to
Front
Case Disassembly
on page 57.