ConMed sabre 180, Service Manual

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4-11
NOTE: If EEPROM A2U4 is defective, the unit
will power up in the "0" condition regardless of
the position of A3JMP1. Refer the unit to ser-
vice, unless the "0" option is desired.
9. Turn power switch OFF.
10. Reinstall the shield cover, taking care not to
crush any of the harness wires. Secure the shield
using all four nuts.
11. Close the top cover, secure it with both rear
panel screws and return the unit to service.
4.5 TROUBLESHOOTING
This section explains the troubleshooting aids
built into the Sabre 180 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.
Section 5 contains schematics, part lists, PWB
layouts and instructions for assembly removal and
replacement.
>WARNING<
READ THE SAFETY SUMMARY IN SEC-
TION 1.1.4 BEFORE TROUBLESHOOT-
ING THE UNIT.
If trouble is suspected, perform a thorough visual
inspection, looking for loose or burned compo-
nents which may point to the source of the prob-
lem. Verify that all connections are clean and seat-
ed properly and that soldered harness connectors
are sound and not shorting. Check all wiring for
evidence of mechanical damage. Check the regu-
lated and unregulated power supply voltages.
Improper supply voltages can produce a multi-
tude of problems. Check that the RF shield is in
place and 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.
4.5.1 Using and Interpreting HLP Codes
The microprocessor is programmed with a num-
ber of fault detection routines designed to shut
the unit down safely if a failure has occurred. This
shutdown procedure will produce a HLP code
that can help with the troubleshooting 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 Cut
and Coag power 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, causing illumination of
the MACHINE lamp and redundantly disables
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, but the only front panel indicator
will be illumination of the MACHINE lamp.
Processor-controlled fault detection occurs
extensively on power-up and to a lesser extent,
continuously during operation. Each test is
assigned a unique HLP number to be displayed
on the Monopolar Coag Power Level Display.
Refer to Appendix A for a complete list of HLP
codes and their possible causes. Appendix A is
located at the end of this manual for easy
retrieval.