ConMed ExcaliburPLUS PC - Diagnostic Modes and WDT Troubleshooting

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4.7.1.1 Checking and Clearing Last Fault
Code
The Last Fault Code (LFC) that occurred during
RUN mode can be viewed and also cleared if
desired, IPs good practice to clear the LFC so
that recurring problems can be confirmed. To use
LFC mode:
1. Enter CAL mode by pressing A3SW land turn-
ing unit on.
2. Press any key to end the display check more
quickly. The unit will then go through self diag-
nostics and sound a two tone signal that it passed
the diagnostics.
3. Press the Monopolar Cut Power adjust keys
until “LFC” appears in the Cut power window.
4. Press “STORE”. At that time, the display will
show the last fault code or, if no Fault Code has
occurred since the unit was last cleared, a series of
dashes will appear on the display Note the LEC
for later reference.
5. TO KEEP THE LEC: press “STORE” to
return to the top level.
6. TO CLEAR THE LFC: Press the “MONI-
TOR SET" key. The display will then change to
a series of dashes. Return to the top CAL menu
by pressing STORE.
4.7.2 Pseudo Run Diagnostics (dIA 2)
Armed with a good understanding of the Theory
of Operation in Section 3, one can make effective
use of Pseudo Run Diagnostics (dIA 2) in cor-
recting any of the faults which result in Err
alarms in Run mode.
Pseudo
Run Diagnostics (dIA 2) is provided to
permit troubleshooting problems which cause the
unit to lock up with a fault code in RUN mode.
Such failures can be in the current limit circuitry,
continuity detectors, or power amplifier, to name
a few. These problems can be more effectively
diagnosed if the unit is made operational.
In Pseudo Run Diagnostics (dIA 2), the unit
operates as in normal RUN mode and will deliver
RF to the output jacks, except the following soft-
ware routines which detect hardware faults are
not executed:
* External NOVRAM validity.
* Program EPROM CRC validity.
* Calibration NOVRAM CRC validity.
* Watchdog Timer Lockout interrupt processing.
* Power Amp Overcurrent interrupt processing.
+ Activation Switch Closure.
¢ Membrane Panel switch closure.
+ A.R.M. circuit failure.
* Power settings in data memory does not
match display.
* Relay test.
CAUTION: If any of those failures exist, the
microprocessor may not shut the system down
or display a fault code. One should be pru-
dent in deciding whether or not to enter this
mode without first attempting to identify the
fault while powered down.
To start Pseudo Run:
1. Enter CAL mode. See Section 4.6.
2. Use the Cut Power adjust keys to select “dIA”
in the Cut Power display.
3. Use the Coag Power adjust keys to select “2”
in the Coag Power Display.
4. Press the Store key to activate mode. At that
time, the unit will perform an abbreviated Self
Diagnostics and then will operate normally except
it will not perform the self checks listed above.
4.7.3 Watchdog Timer Trouble-
shooting
(dIA 1)
This section contains help in troubleshooting the
Watchdog Timer on the Controller PWB (A3)
A faulty Watchdog Timer (WDT) will cause the
microprocessor to stop generating the /WDT sig-
nal in RUN mode. Troubleshooting this circuit
is difficult without that signal, and setting up an
external generator and connecting it to the circuit
is time-consuming.
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