Power Supply/RF Board
4-20 Force FX Electrosurgical Generator C Service Manual
Power Supply/RF Board
Refer to Chapter 9, Service Parts, for components and the Schematics Supplement for
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
other functions:
•Output voltage monitoring
•Output current monitoring
•Leakage current sensing (RF leakage sensing and reduction circuits)
• Spark control circuit
•REM impedance monitoring (REM circuit)
•Handswitch closure detection (IsoBloc circuit)
•RS-232 connector
• Expansion connector
• EKG contact closure connector
•Output high voltage relays
• Temperature monitoring and fan control
Power Supply/RF Board Interfaces
The Power Supply/RF board interfaces to other boards and components as follows:
•AC input line filter
•Control board
•Footswitch board
• Heat sink components (RF damping resistor, RF MOSFET, and high voltage power
supply MOSFETs)
• Single-wire attachment points for connecting the sense transformers
• Low voltage power supply (AC input and DC output)
•Low noise fan
A series of fuse clips connect the RF outputs and other front panel interfaces (i.e., REM
and handswitching signals). The fuse clips mate to lugs located in the output portion of
the front panel.
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