The Control Panel; Led - Epson U220B - TM Two-color Dot-matrix Printer Technical Reference Manual

You can connect up to four cables to the printer. They all connect to the connector panel (on the
bottom rear of the printer), which is shown below.
interface
connector
Note:
This illustration shows the serial interface model. The other interface connector looks slightly different.

3.1.2 The Control Panel

The control panel is shown below.
POWER LED
ERROR LED
PAPER OUT LED
FEED button

3.1.2.1 LED

POWER
On: Power supply is stable.
Off: Power supply is not stable.
ERROR
When this light is on but not blinking, it means that the printer is offline. Check to see if a cover
is open. When this light is blinking, there is an error. See "LED Blinking Pattern" in Chapter 4.
3-2 Setup
drawer kick-out
connector
power supply
connector
Rev. D