PRINTING 30 November, 1999
2-4
2.2 PRINTING
2.2.1 PRINTING PROCESS - OVERVIEW
This machine uses a “write-to-black” system, with negative toner.
•
The charge-brush roller gives the drum surface an approximate negative
charge of -750 V.
•
The exposed area on the drum drops to about -200 V.
•
The development roller carries toner to the latent image on the drum surface.
The bias voltages during printing:
Toner application roller : -650 V
Development roller: -400 V
•
The transfer roller pulls the toner from the drum onto the paper.
A constant current of +4.3
µ
A is applied. The anti-static brush helps to
separate the paper from the drum.
•
The cleaning blade removes any toner remaining on the drum after the image
transfers to the paper.
•
This machine does not use quenching lamp.
-200V
-650V
(0V)
+4.3
µ
µµ
µ
A
-1.2kV
H545D521.WMF
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