SATO CL4NX Operator's Manual page 51

4 Operation and Configuration
Icon Description
Calendar error is detected
Writing/reading information to/from the RFID tag failed
Wireless LAN setting error is detected
Printer error is detected
The temperature of the print head has exceeded the tolerance range.
RFID module is defective.
Bluetooth module is defective.
Authentication with the server failed.
Authentication with the server timed out.
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CL4NX Operator Manual