GE H
EALTHCARE
RAFT
V
OLUSON
E8 / V
OLUSON
E6
D
IRECTION
KTD102576, R
EVISION
7
DRAFT (A
UGUST
23, 2012)
S
ERVICE
M
ANUAL
10-24
Section 10-8 - When There's Too Much Leakage Current...
Section 10-8
When There's Too Much Leakage Current...
10-8-1
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 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 leakage currents, this should be suspected as a possible cause and
the outlet wiring should be visually inspected.
10-8-2
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 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.
10-8-3
Peripheral Fails
Tighten all grounds. Ensure star washers are under all ground studs.
Inspect wiring for bad crimps, poor connections, or damage.
10-8-4
Still Fails
If all else fails, begin isolation by removing the probes, external peripherals, then the on board ones,
one at a time while monitoring the leakage current measurement.
10-8-5
New System
If the leakage current measurement tests fail on a new system and if situation can not be corrected,
submit a Safety Failure Report to document the system problem. Remove system from operation.
10-8-6
ECG Fails
Inspect cables for damage or poor connections.
10-8-7
In case of using an UPS (Uninterruptable Power Supply)
In case of using an UPS (Uninterruptable Power Supply) repeat the tests without using the UPS,
i.e. directly plug the ultrasound system to the AC wall outlet.
