HP 2070N - Manual (Page 71)

Routine maintenance
5 - 15
5
3
Clean the primary corona wire inside the drum unit by
gently sliding the blue tab from right to left and left to right
several times. Return the tab to the home position (
▲)
before you put the drum unit back in the printer. If you do
not, printed pages may have a vertical stripe.
4
Put the drum unit and toner cartridge assembly back in
the printer. Close the front cover of the printer.
Home position (
▲)