Citizen PMU2300III User Manual page 18

Operation Section
POWER LED
 POWER LED
Lights when the power is on, turns off when the power is off.
Flashes when data is incoming or a memory error has occurred.
 ERROR LED
Flashes if the print head is hot, the paper cover is open, a cutter lock occurs,
and so forth.
 FEED Switch
Press this switch to feed paper.
In case of a cutter lock, remove the cause of the lock, close the platen cover,
and then press the FEED switch.
The printer enters the mode for setting memory switches and running self-
printing.
ERROR LED
Refer to 5.3 Setting of Memory Switches
— 17 —
FEED Switch
Refer to 4.4 Self-printing
Refer to 4.6 Error Messages