Kyocera Mita FS-C5016N Quick Reference Manual page 21

There is a paper gauge on the right side of the front of
the paper cassette to indicate the remaining paper sup-
ply. When paper is exhausted, the pointer will go down
to the level of (empty).
Insert the paper
8
cassette into the
slot in the printer.
Push it straight in
as far as it will go.
Paper Gauge
19