Epson AcuLaser CX-11N/AcuLaser CX-11NF Field Repair Guide 9/9/05
Printer Component, Software Item, LCD Display, Printer Button Page 3.
Step 2: Exposure/Writing
The image is etched onto the OPC Drum using a laser diode, motor driven polygonal mirror and a series of lenses
and mirrors. The laser beam is deflected by the polygonal mirror, through a series of lenses and mirrors and onto
the OPC Drum. The laser triggers the SOS (Start Of Scan) Sensor to indicate the start of the print line, which then
signals the logic to begin transmitting the print data. The print engine board controls the speed of the polygonal mirror
motor and the modulation of the laser.
Figure 3: The laser diode writes a latent electrostatic image on the OPC Drum
• The laser diode emits a
beam toward the
polygon mirror which
redirects the beam
towards the surface of
the OPC Drum. Where
the surface of the OPC
Drum is exposed to the
beam, only -50v to -
100v remain. The rest
of the charge dissipates
to ground because the
surface cannot hold
that amount of charge
when exposed to light.
Leg_Sec06_008FA
Drum
Mirror
Lens COL
Lens CYL
Lens L1
Polygon Mirror
PWBA SOS
SOS Sensor
Scanner Assy
PWBA LD
Mirror SOS
Window
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