Covidien Valleylab LS10 Service Manual page 70

Correcting Malfunctions
Situation
Continuous patient or
video monitor interfer-
ence
Interference with other
devices only when the
generator is activated
5-6
Possible Cause
The seal cycle was inter-
rupted before completion.
The handswitch or foot-
switch was released before
the end tone activated.
Additional time and energy
are needed to complete the
seal cycle
Faulty power cord or display
cables
Electrical equipment
grounded to different ob-
jects rather than a common
ground. The generator may
respond to the resulting
voltage differences
tween grounded objects.
Malfunctioning monitor
Metal-to-metal sparking
Electrically
ground wires in the operat-
ing room
If interference continues
when the generator is acti-
vated, the monitor is re-
sponding to
frequencies.
Valleylab LS10, LS Series Single Channel Vessel Sealing Generator Service Manual
Solution
Reactivate the seal cycle
without removing or reposi-
tioning the instrument.
Check and replace power
cord and display cables for
the monitor and power
cord for the generator.
is Plug all electrical equipment
into line power at the same
location. Contact your bio-
medical-engineering
partment or a Covidien
be- Technical Service represen-
tative for assistance.
Replace the monitor.
Check all connections to
the generator and LigaSure
instrument and cords for
damage.
inconsistent Verify that all ground wires
are as short as possible and
go to the same grounded
metal.
Ask the biomedical-engi-
neering
check with the manufactur-
radiated er of the monitor.
Some manufacturers offer
RF choke filters for use in
monitor leads. The filters re-
duce interference when the
generator is activated.
de-
department to