Table 5-5: Operational Performance Problems - Mallinckrodt NELLCOR NPB-195 Service Manual

5.6.4 Operational Performance
Table 5-5 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 Section 6, Disassembly Guide.

Table 5-5: Operational Performance Problems

Condition
1. The Pulse AMPLITUDE
indicator seems to
indicate a pulse, but the
digital displays show
zeroes.
2. SpO or Pulse values
2
change rapidly; Pulse
AMPLITUDE indicator is
erratic.
Section 5: Troubleshooting
Recommended Action
1. The sensor may be damaged; replace it.
2. If the condition still persists, replace the UIF
PCB.
1. The sensor may be damp or may have been
reused too many times. Replace it.
2. An electrosurgical unit (ESU) may be
interfering with performance:
– Move the NPB-195 and its cables and sensors
as far from the ESU as possible.
– Plug the NPB-195 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.
3. Verify the performance with the procedures
detailed in Section 3.
4. If the condition still persists, replace the UIF
PCB.
5-5