GE M
EDICAL
S
YSTEMS
D
IRECTION
2392751-100, R
EVISION
3
V
IVID
™ 4 S
ERVICE
M
ANUAL
10-30
Section 10-3 - Periodic Maintenance Schedule
Section 10-8
Excessive Current Leakage
10-8-1
Possible Causes of Excessive Current Leakage
10-8-1-1
Chassis Fails
Check the Ground on the power cord and plug for continuity. Ensure the Ground is not broken, frayed,
or intermittent. 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. Notify the user or
owner to correct any deviations. As a work around, check the other outlets to see if they could be used
instead.
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 current leakages, this should be suspected as a
possible cause and the outlet wiring should be visually inspected.
10-8-1-2
Probe Fails
Test the probe in another connector to verify 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 current leakages 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 inter-cavity probe. Be sure to enter the correct probe
type in the appropriate space on the check list.
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.
10-8-1-3
Peripheral Fails
Tighten all Grounds. Ensure star washers are under all Ground studs.
Inspect wiring for bad crimps, poor connections, or damage.
10-8-1-4
Still Fails
If all else fails, begin isolation by removing the probes, external peripherals, then the on-board
peripherals (one at a time) while monitoring the leakage current measurement.
10-8-1-5
New Unit
If the leakage current measurement tests fail on a new unit and if the situation cannot be corrected,
submit a Safety Failure Report to document the system problem. Remove the unit from operation.
10-8-1-6
ECG Fails
Inspect cables for damage or poor connections.
