Had one of these come in – sometimes it would feed the paper a little, other times not at all, and sounded like it might be a broken tooth on a gear.
Turned out a small spring that holds a white cog in place had jumped over 1mm. Putting it back into the indent holds the white cog in place so it doesn’t slip on a line feed.
Spring to fix line feed.
PS – If you can’t set the date, remember it’s American format.