Oki B6200 - ROS Control; ROS Reference Value; Rotation of Scanner Motor; Warm-Up of ROS

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Chapter 6 Principle of Operation
6.2 ROS Control
6.2.1 Rotation of Scanner Motor
The control (ON/OFF) of the rotation of the Scanner Motor is performed as shown below according to
the mode of operation.
The following table gives the resolution that differs according to the specifications of the machine, and
the corresponding rotational speeds of the Scanner Motor.
dpi (dot per inch)
rpm (revolutions per minute)
Reference Each facet of the Polygon Mirror (12 facets for 34PPM, and 6 facets for 24PPM) is
scanned with a laser beam.
6.2.2 Warm-up of ROS
The Scanner Motor rotates simultaneously with the warm-up of the ROS. The SOS signal is sampled
at intervals of 100 ms. If the obtained value is shorter than the Ready reference value three
consecutive times, the warm-up of the ROS is ended (The Scanner Motor is rotating at a constant
speed).
6.2.3 ROS Reference Value
Reference If the speed of the Scanner Motor increases by more than 1%, the laser beam does
not enter the SOS Sensor, and "U2" is detected in terms of Fail reference value.
Mode of operation ON/OFF of rotation of Scanner Motor
Standby state Kept OFF.
Printing state
Turned on by receiving signal from the Control-
ler, and turned off after 10 s since end of print-
ing.
Power-saving state Kept OFF.
Type Process Speed Resolution RPM of Scanner CLK signal frequency
34PPM 204mm/s
600dpi 24,094.49rpm 2,049.449Hz
1200dpi 24,094.49rpm 2,049.449Hz
24PPM 141mm/s
600dpi 33,307.09rpm 3,300.708Hz
1200dpi 33,307.09rpm 3,300.708Hz
ROS reference value Descrption
Ready reference value
SOS signal interval corresponding to less than 98% of the specified
rotational speed of the Scanner Motor
Fail reference value
SOS signal interval corresponding to less than 90% of the specified
rotational speed of the Scanner Motor