HP 220240 - Manual (Page 171)

7.1.3 Cleaning the Transfer Corona Wires and Discharging
Pins
The transfer corona wires and discharging pins are part of the paper
transfer area inside the printer. Normally, you clean these corona wires
and discharging pins each time you replace the EP-S cartridge, but you
may find it necessary to clean them between cartridge replacements if you
experience problems with print quality.
NOTE:
Use a dry cotton swab, such as the one supplied with new EP-S
cartridges, to clean the corona wires.
1. Be sure the printer is not printing and the display reads
00 READY.
2. Press the power switch on the back of the printer to the O (OFF)
position.
MLO-005117 (Figure 7-17; 15 picas)
Maintenance 7–15