Johnson & Johnson ETHICON ENDO-SURGERY HARMONIC 300, Service Manual

Page: 56 / 80

54 GEN04
Service Manual
Footswitch Activation
Is the “Ready
LED” on the
front panel lit?
Is the
“Ready LED”
on the front
panel lit?
Footswitch
activation is not
functioning
properly
Push the
“STANBY” button
on the front panel
NO
Proceed to
Section 4.4 to
troubleshoot
the front bezel
Retest for
footswitch
activation
functionality
Note 1: Resistance Levels Between pins of J12 or J13 on PCB (wi th f ootswitch co nnected, unl ess otherw ise noted):
a.) Between Pin 1 & 3:
i.) >10K with “MIN” pedal not depressed
ii.) <50 ohms with “MIN” pedal depressed
b.) Between Pin 2 & 3:
i.) >10K with “MAX” pedal not depressed
ii.) <50 ohms with “MAX” pedal depressed
c.) Between Pin 4 & 3:
i.) <10 ohms with footswitch connected
ii.) >10K with footswitch disconnected
Check
Resistances at J12
and J13 on PCB-
see Note 1.
Resistances
correct at J12
and J13? See
Note 1 Below.
Footswitch connectors on back
panel of Generator
J12 (on PCB)
Pin 1
Pin 2
Pin 3
Pin 4
J13 (on PCB)
Pin 1
Pin 2
Pin 3
Pin 4
YES
NO
Check Voltages at
J12 or J13 on
PCB- see Note 2.
Note 2: Voltage Levels Between pins of J12 or J13 on PCB (with footswi tch connected, u nless otherwise no ted ):
a.) Between Pin 1 & 3:
i.) >4VDC with “MIN” pedal not depressed (or if footswitch not connected)
ii.) <0.5VDC with “MIN” pedal depressed
b.) Between Pin 2 & 3:
i.) >4VDC with “MIN” pedal not depressed (or if footswitch not connected)
ii.) <0.5VDC with “MIN” pedal depressed
c.) Between Pin 4 & 3:
i.) <0.5VDC with footswitch connected
ii.) >4VDC with footswitch NOT connected
Remove footswitch
cable and check
cable continuity &
connection pins
Replace
Footswitch
Cable
Replace
Footswitch
YES
YES
Footswitch
Cable checks
out correctly?
NO
NO
Replace Generator
PCB or call EES for
service
Voltages
check out
correctly?
NO
YES
Footswitc h Activation Troubleshooting
Fig. 12-11 Footswitch Activation Troubleshooting Flowchart