fp-7715 help

[kevin]

I hope someone can help me. I know nothing about copiers and accidently found your site. Maybe some kind person will help me. I am trying to get panasonic fp-7715 copier working it is showing code u 16 any help welcomed. Thank-u in advance.........kevin

[Utahrob1]

The developer unit is not pluged in.

[kevin]

thank-u very much for your help