Covidien Force FX, Руководство по обслуживанию

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Control Board
4-6
Force FX Electrosurgical Generator C Service Manual
Control Board
Refer to Chapter 9,
Service Parts
, for components and the Schematics Supplement for
Board Drawings and Schematics
.
The Control board contains the circuitry that controls the generator, including the
indicators and switches on the Display board and the RF output stage on the Power
Supply/RF board. Firmware on the Control board performs many diagnostic and
initialization routines. Errors are reported as alarm numbers on the front panel.
The Control board interfaces with the Power Supply/RF board through a 96-pin card edge
connector. It interfaces with the Display board through a 64-pin ribbon cable.
Microcontrollers
Two microcontrollers on the Control board control the generator. These microprocessors
communicate with each other through a shared RAM. The main microcontroller (U5)
performs all system functions, except the time-critical real time feedback control of
generator RF output.
The feedback microcontroller (U11), which is a separate, dedicated microcontroller,
handles the time-critical real time feedback control of generator RF output. All system
analog signals are available to these microcontrollers.
A third microcontroller (U9) functions as an application-specific integrated circuit, or
ASIC. It generates the RF drive waveforms (T_ON\) for the RF output stage.
Main Microcontroller
The main microcontroller (U5) is an 80C562 that incorporates an 8-input multiplexed
8-bit A/D converter. The main microcontroller is responsible for overall system control. It
monitors all dosage error functions and safety circuits. It implements the user interface,
including activation control. It is primarily responsible for these functions:
• Segment display drivers and LED update
• Power control buttons, mode buttons, and the activation interface
• Serial port interface
• Alarm handling
• REM
• Audio control
• Memory control and storage (system alarms with time stamps; calibration values)
• Real-time clock control and interface
• Internal self-tests
• Communicating with the feedback microcontroller