NELLCOR PURITAN BENNETT Symphony N-3000 Service Manual page 61

5.6.5 Operational Performance
Table 5-6 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 5-6: Operational Performance Problems
Condition
1. The PULSE
AMPLITUDE
indicator seems to
indicate a pulse, but
the digital displays
show zeroes.
2. SpO or pulse rate
2
values change rapidly;
PULSE AMPLITUDE
indicator is erratic.
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 N-3000 and its cables and sensors as
far from the ESU as possible.
– Plug the N-3000 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 SpO performance with service
2
mode menu items 31-39. Verify the pulse
measurement function with the SRC-2.
4. If the condition still persists, replace the UIF
PCB.
Section 5: Troubleshooting
5- 9