Troubleshooting; Hlp Codes; Pseudo Run Diagnostics (Dia 2) - ConMed Sabre 2400 Operators & Service Manual

4.7 TROUBLESHOOTING

This section explains the troubleshooting aids
built in to the Sabre 2400 and provides a guide
to their use. Not all failures can be covered in a
guide such as this, so the troubleshooter must
by necessity understand the full operation of the
unit. Read Section 3 for the description of system
and circuit theory.
>WARNING<
READ THE SAFETY SUMMARY
IN SECTION 1.1.4 BEFORE
TROUBLESHOOTING THE UNIT.
If trouble is suspected, perform a thorough visual
inspection, looking for loose or burned com-
ponents which may point to the source of the
problem. Verify that all connections are clean and
seated properly and that soldered harness connec-
tors are sound and not shorting. Check all wiring
for evidence of mechanical damage. Check the
regulated and unregulated power supply volt-
ages. Improper supply voltages can produce a
multitude of problems. Check that all mechanical
connections are secure. Check all fuses. Check the
operating instructions and see if the suspected
problem was actually designed to work that way.

4.7.1 HLP Codes

The Sabre 2400 microprocessor is programmed
with a number of fault detection routines
designed to shut the unit down safely if a failure
has occurred. This shutdown procedure will pro-
duce a HLP code that can help with the trouble-
shooting process. The following will further
explain the HLP codes and other troubleshooting
aids.
Upon fault detection, the program will branch
to an endless loop which displays a fault HLP
code in the Monopolar Cut and Coag power
level displays. This loop takes /RFEN false, forces
VBASE and the waveform generator output to
zero drive condition and commands the relays to
open. Further, it ceases generation of Watchdog
Timer strobes and redundantly disables the base
and gate drive to the Power Amplifier. If the
Watchdog Timer detects a processor fault, it will
issue an interrupt to the processor, causing a
branch to the same routine as above if the proces-
sor is healthy enough to respond; if not, RF will
still be disabled.
Processor-controlled fault detection occurs exten-
sively on power-up and to a lesser extent, con-
tinuously during operation. Each test is assigned
a unique HLP number to be displayed on the
Monopolar Coag Power Level Display. Refer to
Table 4.7 for a complete list of HLP codes and
their possible causes.

4.7.2 Pseudo Run Diagnostics (dIA 2)

Armed with a good understanding of the Theory
of Operation in Section 3, one can make effec-
tive use of Pseudo Run Diagnostics (dIA 2) in
correcting any of the faults which result in HLP
alarms in Run mode.
Pseudo Run Diagnostics (dIA 2) is provided to
permit troubleshooting problems which cause the
unit to lock up with a HLP 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.
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