Gerber Sabre Owner's Manual page 75

Error
"X POLARITY REVERSED"
"Y POLARITY REVERSED"
"Z POLARITY REVERSED"
Beep Codes
Flash memory not loaded
1 beep
RAM error
2 beeps
Hardware Board error (incorrectly
3 beeps
reads a 'known' I/O address)
Flash write error
4 beeps
Can't communicate with keyboard
5 beeps
not used
6 beeps
Servo system Axis error
7 beeps
Multifunction Peripheral chip
8 beeps
error
FW system error
9 beeps
Cause
Encoder count indicates
backward motion
Cause
Remedy
Check wiring.
Test Limit Switch(es) for that
axis. A failed limit switch
opposite travel direction will
result in the Tower receiving
info that registers as motion
in reverse of command.
Remedy
Check Flash memory.
Check RAM.
Replace CPU board.
Check Flash memory.
Check keyboard and connections.
See remedies for Axis errors
above.
Replace CPU board.
This could be caused by a variety
of problems. The most likely
problems are bad RAM or faulty
CPU board.
Error Messages 67