M4735A Service Manual 3-19
Operational Problems
3
Operational Problems
These tables describe problems that may arise with specific functions or oper-
ations while using the M4735A.
ECG Monitoring
The following table covers problems that might arise while monitoring ECG.
NOTE Before replacing any parts, check to see if the cables and flex circuits are
properly connected. See "Servicing Notes" on page 4-1.
Table 3-7 Operational Problems - ECG Monitoring (Pads, Paddles or Leads)
Symptom Possible Cause Suggested Solution
Noisy trace - constant noise on the
baseline.
Incorrect configuration - power line
frequency (50 or 60 Hz) or Filter
settings.
Check/change configuration as
needed.
Nearby source of constant
interference.
Try moving cable/leads; try
relocating the unit.
Bad connection somewhere in
signal path.
Pads: Check connection between
pads and adapter cable, also con-
nection to unit.
Paddles: Check connection to unit.
Leads: Check connections between
leads and trunk cable, also connec-
tion to unit.
Failure in connector. Pads: Replace Patient Connector.
Paddles: Replace Patient Connec-
tor.
Leads: Replace ECG Connector.
Failure in ECG front end. Pads: Replace Power PCA.
Leads: Replace Parameter PCA.
Failure in signal processing circuits. Replace Control PCA.
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