Laser Exposure Process - Xerox MF Series Technical Document

5-2.

Laser Exposure Process

• The laser beam light emitted from the Print Head is used to create an electrostatic latent
image on the surface of the PC Drum.
• The following control is provided to correctly time image printing.
PC Drum
• When the printer receives a PRINT signal, the Polygon Motor and the Main Motor start
rotating and the paper is taken up and fed into the printer.
• The printing is started when the Controller/Mechanical Control Board sends a VIDEO
signal to the Print Head a given period of time after the leading edge of the paper actu-
ates the Paper Take-Up Switch (TOD signal).
• The print start position for the 2nd line is defined by delaying the time, at which the
VIDEO signal is to be transmitted.
• The SOS Sensor provided in the PH ensures that the laser beam is emitted at the same
timing for all lines in the main scanning direction.
Print Head Unit
Polygon Motor
M-6
Laser Diode
SOS Sensor
4136M006AA