Power Supply/RF Board
Principles of Operation
Force FX-8C Service Manual 4-21
Low Voltage Power Supply
The low voltage power supply is rated for 40 watts. It delivers a regulated
+5 Vdc and ±12 Vdc output. This power supply automatically adjusts for
both input voltage ranges. It also has internal current limiting. The
pinouts between the low voltage power supply and the Power Supply/
RF board are listed below:
The low voltage power supply specifications are as follows:
* Total output power cannot exceed 40 W.
RF Output Stage
The RF stage consists of a single MOSFET power switch with associated
gate drive circuitry, an RF power transformer, tuning capacitors, an RF
output L-C-C filter, output directing relays, and topology selecting relays.
Also included in this section are the RF voltage and current sense circuits
and a switched damping network for certain operational modes.
The MOSFET gets its gating signal from the T_ON ASIC on the control
board. The T_ON ASIC also provides the gating signal for the switched
damping network.
PIN Voltage Test Point
1 +5 Vdc TP8
2 –12 Vdc TP5
3 +12 Vdc TP6
4 GROUND TP9
Output Voltage Output Current Output Power*
+5 Vdc 4000 mA 20.0 W
–12 Vdc 400 mA 4.8 W
+12 Vdc 2000 mA 24.0 W
Warning
High frequency, high voltage signals that can cause severe burns are present in
the RF output stage and in the associated mounting and heat sink hardware
described in this manual. Take appropriate precautions when testing and
troubleshooting this area of the generator.
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