Printronix L1024, Maintenance Manual

Page: 366 / 372

D–4 Appendix D – Principles of Operation
Developing the Print Image
The OPC drum, with its latent image, rolls past the sleeve and magnet roller, which is part of the
developer unit. The powdered toner is magnetized, which keeps it lightly attracted to the sleeve over
the magnet roller. The sleeve is charged to approximately –500 volts. As the image on the OPC drum
passes the developer unit, the negatively charge toner is attracted to the exposed areas of the drum
because of the voltage difference (–500 to –100 volts) as shown in Figure D–3. On non–exposed
areas of the drum, the reverse is true. The negatively charged toner is forced away by the higher
negative charge on the drum (–500 to –700 volts). The toner image on the drum is called the
“developed image.”
OPC Drum
Doctor Blade
Toner and Carrier
Sleeve
Magnetic Roller
N
N
N N
S S
S
S
Figure D–3. Developing the Print Image