Epson Stylus Color 900 Manual page 140

Don't open the clamp
or remove a cartridge
except to replace
it with a new one.
Once you remove a
cartridge, you can't
reuse it, even if it
contains ink.
To avoid damaging
the printer, never
move the print head
by hand.
Maintenance and Transportation
4 Press the R cleaning button and hold it for about three seconds until
the print head moves left and the P power light begins flashing. The
print head moves to the black or color cartridge replacement position,
depending on which ink cartridge is empty.
5 Pull up the ink cartridge clamp. The cartridge rises up from its holder.
Page 140