Control Board
5-4 LigaSure Vessel Sealing Generator Service Manual
Control Board
Refer to Chapter 10, Service Parts, for components and the Schematics
Supplement for system schematics.
The control board contains the circuitry that controls the generator, including the
indicators and switches on the display board and the Radio Frequency (RF) output
stage on the RF board. Firmware on the control board performs many diagnostic
and initialization routines, and reports errors as alarm numbers on the front panel.
The control board interfaces with the 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 LigaSure system. These
microcontrollers communicate with each other through a shared random access
memory (RAM). The main microcontroller (U5) performs all system functions
except the feedback control of the generator RF output. The feedback
microcontroller (U11), which is a separate, dedicated microcontroller, controls the
real-time-critical feedback control of the 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
• 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
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