Oki MC860 Maintenance Manual

43967002TH Rev.1
31 /
Oki Data CONFIDENTIAL
2. Theory of Operation
(1) Electro-photographic process
Outline of the electro-photographic process is described below.
1. Charge
Vol
tage is applied to the CH roller in order to charge the surface of the OPC
drum.
2. Exposure
The
LED head irradiates light in accordance with the image signal on the
charged surface of the OPC drum.
Amo
unt of charge at the irradiated segment on the surface of the OPC
drum is decreased in accordance with strength of irradiated light so that the
electrostatic latent image is created on the surface of the OPC drum.
3. Develop
The
charged toner is attracted by the electrostatic latent image on the OPC
so that the toner is developed on the OPC drum surface.
4. Transfer
A p
rint paper is overlaid on the OPC drum surface and the toner image is
transferred to a paper when electric charge is applied to the transfer roller
from the back of a paper.
5. Drum cleaning
The
drum cleaning blade removes the residual toner that is remained on the
OPC drum after image transfer.
6. Belt cleaning
The
belt cleaning blade removes the residual toner that is remained on the
belt.
7. Fix
Ton
er is fused when heat and pressure applied to the toner image on the
print paper.
2.1 Electro-photographic process system
(2) Charge
Voltage is applied to the charge roller that is contacting with the OPC drum surface
so that the OPC drum surface is charged.
(3)
Exposure
The light that is generated by the LED head is irradiated to the charged surface of
the OPC drum. Amount of charge at the irradiated segment on the surface of the
OPC drum is decreased in accordance with strength of irradiated light so that the
electrostatic latent image is created on the surface of the OPC drum.
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Power
supply unit
Charge roller
OPC drum
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Power
supply unit
OPC drum
Paper
LED head
OPC drum
LED head
Charge roller

Oki MC860 Specifications

Printing Specifications

print speed color	26 ppm
print speed black & white	33 ppm
time to first page color	10 seconds
time to first page black & white	9.5 seconds
print resolution	1200 x 600 dpi
processor	500 MHz PowerPC CPU
duty cycle	75, 000 prints per month

Copying Specifications

copy speed color	26 cpm
copy speed black & white	33 cpm
first copy out color	14.5 seconds
first copy out black & white	13 seconds
copy resolution	600 x 600 dpi

Scanning Specifications

scan type	Color and black & white
max scan area	11" x 17"
scan speed black & white	33 spm
scan speed color	26 spm
scan resolution	600 dpi

Fax Specifications

fax modem	33.6 Kbps Super G3
transmission speed	2 seconds/page
fax resolution	600 x 600 dpi
speed dial locations	500 locations
broadcast transmission locations	530 locations

Power and Acoustic Noise

power consumption peak	1, 300W
power consumption standby	160W Avg.
power save mode	≤25W
acoustic noise operating	54dB
acoustic noise standby	≤37dB

System Memory

standard imaging RAM	512 MB
max imaging RAM	768 MB
hard disk drive	40 GB

Weight and Dimensions

1-tray configuration dimensions	22.2" x 25.9" x 26.3"
2-tray configuration dimensions	33.3" x 30.2" x 44.5"
weight 1-tray configuration	149.9 lb
weight 2-tray configuration	200.6 lb
weight 3-tray configuration	211.6 lb