Sanyo SRP-270 - Manual (Page 5)

1-3. Functions
The power switch is used to turn the printer on and off.
The FEED button is used to feed roll paper.
The POWER light (green) is on when the printer is turned on and is off when the
printer is turned off.
The ERROR light (red) is on when the printer is in error state.
The Paper Out light(red) is on when the printer is in paper end.