Philips HEARTSTART XLT Service Manual page 71

Table 3-7 Operational Problems - ECG Monitoring (Pads or Leads)
Symptom
Noisy trace - constant noise on the
baseline.
Noisy trace - intermittent bursts of
noise or random spikes.
Noisy trace - low frequency, peri-
odic.
Leads
Flat line - no waveform, no
Off Pads Off
or message.
M3500B/M5500B Service Manual
Operational Problems
These tables describe problems that may arise while using the M3500B/
M5500B.
ECG Monitoring
The following table covers problems that might arise while monitoring ECG.
Possible Cause
Incorrect configuration - power line
frequency (50 or 60 Hz) or Filter set-
tings.
Nearby source of constant interfer-
ence.
Failure in ECG front end.
Failure in signal processing circuits.
Nearby source of time-varying inter-
ference, such as radio transmitter
(paging, walkie-talkies) or X-Ray
system.
Failure in ECG front end.
Failure in signal processing circuits.
More than one instrument con-
nected to the patient and active.
Short in internal ECG wiring or front
end.
Failure in signal processing circuits.
Operational Problems
Suggested Solution
Check/change configuration as
needed.
Try moving cable/leads; try relocat-
ing unit.
Pads: Replace Power PCA.
Leads: Replace Interface PCA.
Replace Control PCA.
Try moving cable/leads; try relocat-
ing unit.
Pads: Replace Power PCA.
Leads: Replace Interface PCA.
Replace Control PCA.
Only have one active instrument on
the patient at a time.
Pads:
1. Replace Power PCA.
2. Replace Patient Connector +
its internal cable.
Leads:
1. Replace Interface PCA.
2. Replace ECG connector +
internal ECG cable.
Replace Control PCA.
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