Printronix L5520 - Manual (Page 134)

Chapter 4 Consumables Replacement
134
CAUTION The toner sensor is sensitive to both electrostatic discharge
(ESD) and positional adjustment. Do not touch the sensor with
your hand or jar it from its factory-set position. (See page 132.)
IMPORTANT When replacing developer in an existing developing unit, you
must empty and clean the unit before adding new developer
Do this every 150,000 pages.
6. Remove the three screws on the developing unit cover and the
cover.
7. With the developing unit in the plastic bag, do the following:
a. Remove the developer and toner in the toner hopper by
gently shaking the developing unit up and down with the
opening of the toner cartridge facing downward.
b. Rotate the developing unit and gently shake it to allow any
remaining developer or toner to fall out of the cover slot.
8. Remove the developing unit from the plastic bag and place it on
a protected surface.