Ricoh SP 200 Specifications download pdf (Page 45)

4.4 DRUM CHARGE

4.4.1 Overview

This copier uses a drum charge roller system instead of a corona wire

scorotron system to charge the drum. For the copy image area or during

roller cleaning, the drum charge roller [A] contacts the surface of the drum [B]

to give it a negative charge.

The drum charge roller system has the following advantages over the corona

wire scorotron charge system.

•

The amount of ozone generated during drum charging is less than about

1/10 of that for a corona wire scorotron system.

•

The applied voltage is 1/2 ~ 1/3 that of a corona wire scorotron system.

•

The efficiency of drum charge is high.

Due to these advantages, no ozone filter is required in this copier.

The high voltage supply board [C] gives a negative dc voltage to the drum

charge roller through the charge roller terminal [D], rear pressure spring [E],

and the rear roller bushing [F]. This gives the drum surface a negative charge

of –900 V.

[A]

[B]

[C]

[E]

[D]

[F]

A193Dd543.wmf

PCU (PHOTOCONDUCTOR UNIT) 1 August 1996

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Ricoh SP 200 Specifications Page 45