Lanier color engines separate the consumables, so a full service means toner plus developer plus a drum unit. The B1803 developer range runs one part per color, from B1803001 black through B1803004 yellow, and B1809511 covers the color drum. Developer lasts far longer than toner but does wear out, and skipping it is a common cause of washed out or muddy color.
Lanier, Ricoh and Savin Part Numbers
Lanier machines come from the same family as Ricoh, Savin and Gestetner, and many listings show the Ricoh equivalent next to the Lanier code. If a number in this section does not match your label, the Ricoh or Savin color pages are the next place to look before assuming the part is wrong.
