Printing - OKIDATA OF1000 Service Manual

Page: 58
Service Guide OF1000
Chapter 2 Principles of Operation

2.5.10 Printing

Refer to the Printing Process Diagram .
Printing is accomplished as follows.
· Approximately - 1.3 Kvdc is supplied to the charge roller. This causes the drum to charge to
approximately - 750 vdc.
· The LED head is turned ON in accordance with signals from the printer control board. This
causes a latent electrostatic image to be formed on the surface of the drum.
· Through the development process, a toner image replaces the electrostatic image.
· A + 1 Kvdc charge is applied to the transfer roller. This causes the toner image to be transferred
to the receive paper.
· Heat and pressure cause the toner image to become fused to the receive paper. The 150 degree
Centigrade fusing temperature is attained by turning a 400 watt halogen lamp ON. The fusing
temperature is controlled by a thermistor. In the event of a thermistor failure, a temperature fuse
will OPEN, turning off the quartz lamp, and preventing equipment damage.
· The residual toner is removed from the drum.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)