Printing; Printing Process - Overview - Ricoh FAX3700l Service Manual

DETAILED SECTION DESCRIPTIONS

PRINTING

2.2. PRINTING

2.2.1. Printing Process - Overview

This machine uses a "write to black" system, using negative toner.
•
The charge corona wire gives the drum surface a negative charge
of about -750 V.
•
The exposed area on the drum drops to about -100 V.
•
The development roller carries toner to the latent image on the drum sur-
face. The bias voltages during printing are as follows:
Toner application roller : -700 V
Development roller: -400 V
•
The transfer roller pulls the toner from the drum onto the paper.
A constant current of +4 µA is applied. The antistatic brush helps to
separate the paper from the drum.
•
The cleaning blade removes any toner remaining on the drum after the
image is transferred to the paper.
•
The quenching lamp reduces the negative charge on the drum to about
-50 V.
2-12
August 2nd,1995
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