14 Assembling the Printer
6. Push up the switch located at the upper left, then release it.
7. Turn the upper knob clockwise until it stops. The switch
automatically drops down and the next empty cartridge slot
appears.
Note:
If the knob cannot be moved, first check that the switch is in the
upper position. Do not force the knob.
8. Install the other cartridges as described in steps 2 to 7 (skip
steps 6 and 7 for the last cartridge).
9. Next, install the photoconductor unit as described in the
following section.