Covidien Force FX, Service Manual

Page: 162 / 246

Correcting Malfunctions
6-8
Force FX Electrosurgical Generator C Service Manual
(Continued)
Generator is on
and accessory is
activated, but
generator does
not deliver output
RF output stage malfunction
(high voltage is present during
activation) Troubleshoot the RF output stage as
described below:
On the Power Supply/RF board, verify
T_ON\ pulses at U4 during activation.
•
If pulses are not present before U4,
replace the Control board. Refer to
Control Board Replacement
on
page 7-4
.
•
If pulses are present at U4 but not
after U4, replace U4.
Check the power MOSFET at J9 for
failure (typically fail shorted).
Check all output relays to verify that they
are toggling during operation. If they are
not, check the relay drivers (U15 and
U16).
Check for shorting of the output tuning
inductors (T14 and T15).
Footswitch will
not activate
output Malfunctioning or damaged
footswitch receptacle Replace the Footswitch board. Refer to
Footswitch Board Replacement
on
page 7-8.
Footswitch activation signal
lost on Control board Replace the Control board. Refer to
Control Board Replacement
on page 7-4.
Continuous
monitor
interference Faulty chassis-to-ground
connections
•
Check and correct the chassis ground
connections for the monitor and, if
applicable, for the generator.
•
Check other electrical equipment in
the room for defective grounds.
Electrical equipment is
grounded to different objects
rather than a common
ground. The generator may
respond to the resulting
voltage differences between
grounded objects. Plug all electrical equipment into line
power at the same location.
Malfunctioning monitor Replace the monitor.
Continued
Situation Possible Cause Recommended Action