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Table 3-7 Operational Problems - ECG Monitoring (Pads or Leads) (Continued)
Symptom
Poor Pads ECG signal quality.
QRS beeper inaudible or beeps do
not occur with each QRS complex.
Fails ECG Test in Diagnostic Mode.
Table 3-8 Operational Problems - SpO
Symptom
No response - no value on screen,
no pleth bar.
Reads obviously wrong value.
Noisy/intermittent signal
M3500B/M5500B Service Manual
Possible Cause
The multifunction pads are not mak-
ing proper contact with the patient.
The multifunction pads are outdated
or dried-out.
Radio frequency interference (RFI)
is causing artifact.
The QRS beeper is configured to
Off.
The volume is set too low.
The amplitude of the QRS complex
is too small to detect.
Failure in Pads ECG front end or
signal processing.
Failure in Leads ECG front end or
signal processing.
SpO
Monitoring
2
The following table covers problems that might arise while monitoring SpO
Monitoring
2
Possible Causes
Bad internal connection.
SpO 2 PCA failure.
Control PCA failure.
Interface PCA failure.
Same as above.
Same as above.
Operational Problems
Suggested Solution
Check that the pads are properly
applied. If necessary, prepare the
patient's skin and apply new pads.
Check the date code on the pads.
Do not open the pads package until
immediately prior to use.
Relocate or turn off equipment that
may be causing RFI.
Configure the QRS beeper to On.
Adjust the volume.
Adjust the size of the ECG.
1. Replace Power PCA.
2. Replace Control PCA.
1. Replace Control PCA.
2. Replace Interface PCA.
Suggested solution
Carefully reseat flex cables between
SpO 2 connector and SpO 2 PCA,
and between SpO 2 PCA and Inter-
face PCA. See "Servicing Notes" on
page 4-1.
Replace SpO 2 PCA.
Replace Control PCA.
Replace Interface PCA
Same as above.
Same as above.
3
.
2
3-21
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