Footswitch Board
5-16
Force EZ-C Series Service Manual
Footswitch Board
Refer to Section 10,
Service Parts
, for components and the
Schematics
Supplement
for the board drawing and schematic.
The Footswitch board contains circuitry for the footswitch connectors on the rear
panel, a speaker, and the volume control potentiometer for the audio circuit. The
board interfaces to the Power Supply/RF board.
The monopolar footswitch connector (J1) provides footswitching capability for
the multipin Monopolar Instrument receptacle located on the front panel. Use
only a Valleylab footswitch with the Force EZ-C Series Electrosurgical
Generator. Use of an incompatible footswitch may cause unexpected output. The
bipolar footswitch connector (J4) provides footswitching capability for the
Bipolar Instrument receptacle located on the front panel. Capacitors C1–C5
provide filtering that blocks high frequency noise from exiting the generator on
the footswitch cables.
The audio circuit on the Power Supply/RF board uses the speaker (SP1) on the
Footswitch board to enunciate the presence of RF output and to provide an
auditory indication of alarm conditions. The potentiometer (R1) adjusts the
volume of RF output activation tones. You cannot turn the speaker volume
entirely off. You also cannot adjust the volume used during alarm conditions.
Power Supply/RF Board
Refer to Section 10,
Service Parts
, for components and the
Schematics
Supplement
for the board drawing and schematics.
The Power Supply/RF board is the main board of the generator. It contains the
high voltage power supply and the RF output stage. Circuitry on this board
performs several functions:
•
output voltage monitoring (spark control circuit)
•
leakage current sensing (RF leakage sensing and reduction circuits)
•
REM impedance monitoring (REM circuit)
•
switch closure detection (IsoBloc circuit)
•
RS-232 connector detection
•
EKG contact closure connector detection
•
rear panel footswitch control (footswitch decode circuit)
•
audio tone generation (audio circuit)
•
thermal monitoring (temperature sense circuit) power
