Symptom
Toner sticking to the right side area [A] on the second side of the paper.
* The arrow indicates the paper feed direction.
The toner sticking image:
Solution
Open the front cover.
MP 501/601: Push the button [A] and open the front cover [B].
SP 5300/5310: Open the upper cover [A], and then open the front cover [B].
Pull out the PCDU [A].
Clean the [A] area with a dry cloth.