Epson Stylus SX200 Series Basic Operation Manual page 36

When B light is on, one or more ink cartridges are expended. Replace the
appropriate cartridges.
For how to replace before the cartridge is expended, see the online User's
Guide.
c
Do not lift up the scanner unit
when the document cover is open.

B
Press.
A
Open.
C
Check the color to replace.