Product Manual

GE HEALTHCAREDRAFT VOLUSON® P8 / VOLUSON® P6
DIRECTION 5450839-100, REVISION 5 DRAFT (JANUARY 17, 2013) BASIC SERVICE MANUAL
Chapter 10 - Care & Maintenance 10-31
Section 10-9
When There's Too Much Leakage Current...
10-9-1 Earth and/or Enclosure Fails
Follow the below checklist in case of earth and/or enclosure leakage current failure.
• Confirm the ground of the power cord and plug for continuity.
• Ensure the ground is not broken, frayed or intermittent. If that, replace any defective part.
• Tighten all grounds. Ensure star washers are under all ground studs.
• Inspect wiring for bad crimps, poor connections, or damage.
• Test the wall outlet. Verify it is grounded and is free of other wiring abnormalities. If any deviation
is found, notify the user or owner to correct it. In this case, check the other outlets to see if they
could be used instead as a workaround.
NOTE: No outlet tester can detect the condition where the white neutral wire and the green grounding wire are
reversed. If later tests indicate high leakage currents, this should be suspected as a possible cause and
the outlet wiring should be visually inspected.
10-9-2 Probe Fails
• Test another probe to isolate if the fault lies with the probe or the scanner.
NOTE: Each probe will have some amount of leakage, dependent on its design. Small variations in probe
leakage currents are normal from probe to probe. Other variations will result from differences in line
voltage and test lead placement. The maximum allowable leakage current for body surface contact
probe differs from an inter-cavity probe. Be sure to enter the correct probe type in the appropriate
space on the check list.
• Test the probe in another connector to isolate if the fault lies with the probe or the scanner.
If excessive leakage current is slot dependent, inspect the system connector for bent pins, poor
connections, and ground continuity.
If the problem remains with the probe, replace the probe.
10-9-3 Peripheral Fails
Tighten all grounds. Ensure star washers are under all ground studs.
Inspect wiring for bad crimps, poor connections, or damage.
10-9-4 Still Fails
If all else fails, begin isolation by removing the probes, external peripherals, and then the on-board
peripherals one at a time while monitoring the leakage current measurement.
10-9-5 New Unit
If the leakage current measurement tests fail on a new unit and if situation cannot be corrected, submit
a Safety Failure Report to document the system problem. Remove unit from operation.
10-9-6 ECG Fails
Inspect cables for damage or poor connections.