Toshiba DP120F Service Manual page 279

3.3.4 Polygon Drive
The Polygon motor rotation is controlled by the polygon driver in the LSU so that the laser beam
reflected by the Polygon mirror scans across the drum at a constant speed.
The rotation starts when the Polygon driver receives the Polygon motor drive signal from the
Main PBA.
Then, when the rotation speed of the Polygon motor becomes stable, the polygon driver sends
the Polygon motor synchronous signal to the Main PBA.
05-03-16
Fig. 5-3-16
March 2000 © TOSHIBA TEC 5-19 DP120F/DP125F Mechanical Description