ConMed ExcaliburPLUS PC - System Waveforms

GGI rr ㄴ ㄴ ㄴ ㄴ ‥ ㆍ ㄴ ㄴ ㄱ
low voltage, and this state is interpreted by the
microprocessor as a closure of the switch. When
the hand switch is released, the LED goes dark
causing the phototransistor to cease conduction
and allow the signal line to be pulled to a high
state by resistor network A3RN1, A5C3 bypass-
es any RF currents around the bipolar accessory
switch than may occur due to reverse accessory
connection while blocking de from the Ul LED
when the accessory switch is open.
3.10 Footswitch Isolation
The Footswitch Isolation Assembly, A10, pro-
vides isolation from ground for the monopolar
and bipolar footswitches. This isolation is
required to prevent activation in case either side
of the switches are shorted to ground. The
exposed metal of the switches is grounded, how-
ever. This assembly is mounted to the top cover
RF shield. It is inconvenient to work on the A3
assembly with A10 in its normal position. To
facilitate that, one can easily bypass the A10
assembly by disconnecting the connector from
footswitches to A10, and the cable from A10 to
A3. Connect the cable from the base to A3P7
(the same plug the A10 cable was using). Be sure
to restore original connections before returning
unit to service to provide the required isolation.
Power is provided through the line power isola-
tion transformer A10T1, where it is rectified (D1,
D2) and filtered (C1) to provide the unregulated
dc voltage supply. The remaining circuitry is sim-
ilar in operation to the Continuity Detector (see
Section 3.9), thus the theory will not be repeated.
Figure 3.5 Power Amplifier Waveforms
The following waveforms are representative of those which appear in the Excalibur Plus PC" Power
Conversion Assembly at the collector bus COLL (A4TP2) and the GATE (A4TP4).
Monopolar Pure, 300W, Open Circuit
200V/aiv 7
COLL i
500V/div Di
A SINA
i
senden dere eee
„E GATE 了
σας 400nS/div 10V/div 2uS/div
Monopolar Spray Coag, 80W,
Open Circuit
COLL
GATE
MW
seba
|
10V/div
fle
|
AA
人
AA
和
AA
1uS7div
Bipolar Coag, 50W, Open Circuit
3-16 [=