Samsung CLP 500N - Manual (Page 168)

S OLVING P ROBLEMS 7.12
2 Using the handle, completely open the left cover until it is at
right angles to the main frame and the toner cartridges are
ejected.
C AUTION : If the left cover is not completely open, the top cover
release button does not press.
3 Press the top cover release button to unlatch the top cover
and open it all the way.