Epson TM-P20 Technical Reference Manual page 20

LEDs
Power LED (Blue)
The printer does not operate and the LEDs go out when the battery is not installed in the printer.
 Lights when the power is on.
 Goes out when the power is turned off.
 Flashes when the printer is powering-off or while the Feed button is being pressed in the software setting
mode. With the Wi-Fi model, it flashes also when the printer is being initialized after the power is turned on.
Error LED (Orange)
 Lights when the printer is offline. (For details about offline, see
"Offline" on page 21.)
 Flashes when an error occurs. (For details about the flash codes, see
"Error Status" on page 26.)
 Goes out during normal operation (online).
Battery LED (Blue)
The remaining battery charge is indicated by three LEDs only when the battery is installed in the printer. For
details, see "Operation Mode When Battery is Low" on page 23.
Charge LED (Orange)
The Charge LED is located on the single charger (OT-SC20) and quad charger (OT-MC20).
 Lights when the battery is being charged.
 Off when the battery is not being charged.
 Flashes when there is abnormality in battery charging.
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