Service manual

Troubleshooting Tables
4-7
Low Battery light or Low
Battery message remains on
during extended self-test.
Low battery or defective battery.
Battery fuse is blown.
Battery charger is defective.
Charge or replace battery.
Disconnect the battery and visually inspect the
battery fuse on the battery. Replace the battery,
if necessary.
Replace power supply assembly
Low Battery light or Low
Battery message blinks.
Low battery. Fully charge battery.
One or more power supply
voltages missing (see “Test-
ing the Power Supply” at the
end of this chapter).
Defective regulator circuit(s). Replace power supply assembly.
Table 4-2 Power Supply and Battery
Symptom Possible Cause Corrective Action
Table 4-3 Patient Cable and ECG Front End
Symptom Possible Cause Corrective Action
”Leads off” not indicated
when wire is off.
Dirty contacts on patient cable connector.
Defective or dirty leadwire.
Defective ECG front end.
Ensure the contacts on the patient cable connec-
tor are clean and dry. Reseat the patient cable
connector.
Clean leadwire. Replace patient cable if leadwire
defective.
Replace CPU assembly.
”Leads off” indicated when
wire is not off.
Poor electrode contact.
Defective leadwire.
Improve patient preparation.
Clean leadwire. Replace patient cable if leadwire
defective.