Oki MC860 Maintenance Manual

43967002TH Rev.1
34 /
Oki Data CONFIDENTIAL
2. Theory of Operation
2.2 Print process
The paper that is fed from the tray 1 or tray 2 or tray 3 is transported by the feed paper roller, the
regist roller L and the transport roller. When paper is fed from MTP, paper is transported by the
MPT feed paper roller and the regist roller U. The paper that is transported on the belt passes
through the electro-photographic process of KYMC and the non-diffused toner image is created
on the paper. When paper passes through the fuser unit, the toner image is fused by heat and
pressure. After the toner image is fused, the paper is unloaded to the face-up stacker or the
face-down stacker depending on the unloading method selected by open/close of the face-up
stacker.
Operation during the one-sided print is described above. Operation during the both-sided print
is described below The paper that has passed through the fuser unit after the rear-side print
is completed first, is transported to the Duplex unit by the separator DUP. The paper that has
entered in to the paper inverting transport path is then transported to the inside of the Duplex
unit from the paper inverting transport path by the inverting movement of the inverting roller. The
paper that has passed through the Duplex unit by the transport roller of the transport path inside
the Duplex unit, is supplied from the feed paper path of the Duplex unit so that the paper enters
the same paper transport path as the feed paper route from the trays. The remaining operations
are the same as those of the one-sided print using the paper supplied from the trays.
Face-down stacker
Face up stacker
MPT
Paper inverting transport path
Sub roller
Feed roller
Sub roller
Transport roller
Feed roller
Regist roller L
Regist roller U
MPT feed paper roller
Transport roller
Transport roller
Inverting roller
Separator DUP
Heat roller
Backup roller
Halogen lamp
(1) Feed paper from the 1st tray
1. When the regist motor rotates (in counter-clockwise direction) while the
solenoid is activated to the ON state as shown in Fig. 2-1, the paper is
transported until the IN1 sensor is turned ON. (When the solenoid is turned
ON, the feed paper roller is driven.)
2
. W
hen the paper turns ON the IN1 sensor, the specified amount of paper is
transported so that the paper is pressed against the regist roller L. (Thus,
paper skew is corrected)
3. A
s shown in Fig. 2-2, the solenoid is turned OFF so that paper is transported
by the regist roller L. (When the solenoid is turned OFF, the regist roller L is
driven.)
Regist roller U
(drive)
Regist roller U
(drive)
Hopping roller
(drive)
Hopping roller
(stop)
Paper
Paper
Sub roller
(drive)
Sub roller
(stop)
Regist motor
(Rotates in counter-clockwise direction.)
Regist motor
(Rotates in counter-clockwise direction.)
Regist roller L
(stop)
Regist roller L
(drive)
WR sensor
WR sensor
Solenoid lever
(Solenoid ON)
Solenoid lever
(Solenoid OFF)
Hopping gear Assy
IN2 sensor
IN2 sensor
IN1 sensor
IN1 sensor
Fig. 2-1
Fig. 2-2

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