7-segment display Meaning Troubleshooting
SD Error <n> <n> = single-digit code
A write or read error has occurred on the SD card.
It is possible that the SD card is defective and
must be replaced.
SIGErr=<nn> <nn> = double-digit code
An error has occurred during the signature check.
The error can occur if parts of the CNC software
package were changed or replaced.
Check whether the original CNC software
package is installed and has not been modi‐
fied.
● Install the original CNC software package.
● Contact SIEMENS Technical Support
Service.
unPAC FAIL A problem has occurred when reading, unzipping or
writing the data.
Boot the NCU using the SINUMERIK service
system, and check the partition using the
"Check storage integrity" diagnostics option.
● Contact SIEMENS Technical Support
Service if the diagnostics check was un‐
successful.
The archive with the CNC software is possibly cor‐
rupt or unreadable.
Reinstall the CNC software if the SD card is
OK.
6 With flashing point: Operating system has crashed
where the NCK is no longer clocking
Restart the NCU.
8 "8" and all LEDs are lit yellow: Fan module is not
detected.
Check whether the fan module is inserted or is
defective.
Contact SIEMENS Technical Support Service (Page 3) if the error was not able to be resolved.
Diagnostics
8.1 Error messages
NCU 1760
86 Equipment Manual, 02/2020, A5E45627861B AB
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