Sheet transportation apparatus carrying out error determination considering switching of sheet transportation path

摘要

A timer starts when a first sensor detecting "close" of a switching cover and a second sensor detecting "open" of the switching cover are both OFF at the start of a read out operation. When one of said first and second sensors is turned on before the timer expires, an error is not displayed and the flow proceeds to a subsequent process. When first and second sensors are still OFF when the timer expires, an error is displayed indicating that the switching cover is in a defective open state.