Front Panel
5-10
LigaSure Vessel Sealing Generator Service Manual
Front Panel
The front panel consists of an injection molded plastic bezel with a membrane
keyboard, power switch, and seal and bipolar smart receptacles. These front panel
components connect to the display board and the RF board.
Membrane Keyboard
A high strength adhesive attaches the membrane keyboard to the bezel. The
keyboard is not removable. The membrane contains 16 metal dome push-button
switches. Six of these switches control the up and down sequencing of the power
seven-segment and bar lamp light-emitting diodes (LEDs). One switch controls
the Memory function, which stores previous settings.
The membrane also contains three illumination window LEDs, one for each RF
activation mode. A 12-pin flat ribbon cable connects the membrane keyboard
switches and LEDs to the display board.
Power Switch
A double pole single throw switch snaps into the front of the bezel. This switch
connects the AC mains to supply power to the generator.
Display Board
Refer to Chapter 10,
Service Parts
, for components and the
Schematics
Supplement
for system schematics.
The display board resides in the front panel assembly. It contains RF indicator
lamps, seven-segment LED power setting displays, seal bar lamp setting displays,
and a regrasp indicator lamp. The display board switch circuitry includes the LED
and lamp driver circuitry, power selection switches, mode selection switches, and
the smart switch LED driver circuit.
RF Indicator Lamps
The RF indicator lamps illuminate during RF activation to indicate the presence
of RF power. Two incandescent bulbs illuminate each of the three indicator bars
(seal, bipolar, and macrobipolar) on the front panel.
•
LP11 and LP12 illuminate the blue bipolar bar, indicating bipolar activation.
•
LP7 and LP8 illuminate the light blue macrobipolar bar, indicating cut
activation.
•
LP3 and LP4 illuminate the blue seal bar, indicating seal activation.
The BIP_LMP, MACRO_LMP, and VS_LMP signals control the RF indicator
lamps. These signals originate from port A of the main microcontroller
programmable peripheral (U3) on the control board.
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