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At the beginning of each sweep (before the beam reaches the
drum), the beam is reflected off the beam detect mirror. The
momentary pulse of light is sent to the DC Controller, where it is
converted to an electrical signal used to synchronize the output of
data (
VDO) for one sweep (scan line). This pulse, referred to as
the Beam Detect signal (
BD), is used to diagnose problems with
the laser diode or scanner motor also.
After the writing station, the drum surface has an invisible
(latent) electrostatic image. Portions of the drum not exposed to
the laser are still at the uniform negative potential (placed there
by the primary charging roller), but those portions exposed to
light have been discharged to ground, to form the latent
electrostatic image.
Figure 5-11 Drum Signals
Functional Overview 5-21