Spacelabs Healthcare elance 5, Service Manual

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Troubleshooting
System Troubleshooting Flowchart
This section describes troubleshooting procedures which can be used in conjunction with, or separately
from, the diagnostics to isolate a failure.
ECG/RESP
For optimal cardiac monitoring, it is necessary to recognize problems that can interfere with getting a
reliable ECG signal. Causes of interference include artifact from patient movement and poorly placed or
poorly functioning equipment and electrical interference from AC or other bedside devices.
An artifact, also refer to as waveform interference, may be seen with excessive movement (somatic tremor).
It makes the baseline of the ECG appear wavy, bumpy, or tremulous. Dry electrodes may also cause this
problem because of poor contact. Intermittent artifact may also be due to intermittent lead wires and ECG
cable.
Electrical interference, also refer to as AC interference or 50/60-cycle interference, is caused by electrical
power leakage. It may also result from interference from other room equipment or improperly grounded
equipment. As a result, the lost current pulses at a rate of 50/60 cycles/second. This interference appears on
the ECG as a baseline that’s thick and unreadable. In some case, the waveform baseline can be severely
affected and may cover the whole ECG waveform channel.
Refer to the table below for the most commonly encountered ECG problems, the possible causes, and
interventions.
5-4
Lead fault circuit
functions?
Correct ECG and
RESP waveforms
appear on screen?
ECG and RESP
alarms OK?
YES
YES
YES
End
Noisy ECG
Signal?
Display
ECG/RESP
waveform?
Problem resolved
from previous
stage?
ECG lead
selection
functions?
Re-analyze problem.
Replace ECG input
board
Replace ECG cable
No
No
YES
No
Problem resolved
from previous
stage?
YES
No
No
End
No
YES
Replace Main board
Replace Main board
No
YES
No
Replace Main board
YES
Problem resolved
from previous
stage?
YES
Re-analyze problem.
No