Samsung CLP-550N - Manual (Page 15)

S ETUP G UIDE 15
English
21 Close the left cover. Make sure that it is securely latched.
If you have installed the toner cartridges incorrectly, the left
cover will not close properly. Check again to make sure the
cartridge colors correspond to those marked on the right
hand side. Never use force to close the cover.
N OTE : When printing text at 5% coverage, you can expect a
toner cartridge life of about 7,000 pages for black and 5,000 pages
for color.