Tiny letters appear on printout

Leenmum

Estimable
Mar 26, 2014
2
0
4,510
My canon printer (MP628) is printing letters that I didn't type. In one Powerpoint document (Microsoft office 2011), many c appear while in another an n appears. I have tried cleaning the printer but it still doesn't work.
 

Markkk

Distinguished
Jan 2, 2012
23
0
18,570
If they always appear in the same place?
May be a watermark
A Header or Footer in the document

Export as a PDF - view and print from there to see if ts also happens
 

Leenmum

Estimable
Mar 26, 2014
2
0
4,510


Yes, always appearing in the same places. I managed to print it successfully prior to that.