Service manual

Troubleshooting Tables
4-9
You can use the patient cable test tool and the ECG front end test tool to determine
whether a problem is caused by a poor patient to electrode connection, a defective cable or
a defective cardiograph. See the section titled “Test Tools” in this chapter for more
information about using the patient cable test tool.
NOTE
Table 4-4 CPU Assembly
Symptom Possible Cause Corrective Action
System turns on but won’t
run. Power supply OK.
A cable is not fully seated.
Defective CPU assembly.
Reseat all cables.
Replace CPU assembly.
System won’t turn off. Software has stopped.
Defective CPU assembly
Unplug from AC power. Remove battery. Wait 2
minutes. Replace battery and turn unit on.
Replace CPU assembly.
Table 4-5 Printer
Symptom Possible Cause Corrective Action
Paper doesn’t move; printer error message
displayed
Check paper supply or
the current LED is flash-
ing.
A printer cable is not fully seated.
Defective sensor assembly.
Defective motor assembly.
Defective motor drive assembly.
Defective roller.
Defective roller.
Replace paper or clear paper jam.
Reseat connectors J303 through J306.
Replace sensor assembly.
Replace motor assembly.
Replace CPU assembly.
Replace printer door assembly.
Paper moves then stops and displays error
message
Check paper supply or
the current LED is flash-
ing.
Paper loaded incorrectly.
Dirty sensor lens.
A printer cable is not fully seated.
Defective sensor assembly.
Defective sensor circuit.
Defective roller.
Make sure cardiograph is loaded properly
with approved thermal paper.
Clean sensor lens.
Reseat connectors J303 through J306.
Replace sensor assembly.
Replace CPU assembly.
Replace printer door assembly.
Paper stops in the wrong place after pressing
or . No error
message.
Wrong type of paper.
Sensor hole not cut out properly on
paper.
A printer cable is not fully seated.
Dirty sensor lens.
Defective sensor.
Defective sensor circuit
Make sure cardiograph is loaded properly
with approved thermal paper.
Remove defective sheet of paper.
Reseat connectors J303 through J306.
Clean sensor lens.
Replace sensor assembly.
Replace CPU assembly.
Chart Speed
Chart Speed
Page Advance
Auto