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The formatter then sends VDO data to the DC controller. The DC
controller translates the
VDO signal into a VIDEO OUT signal
(
VDOUT), which modulates the laser diode ON and OFF, creating
intermittent bursts of laser light that are reflected off the scanner
mirror and onto the photosensitive drum to form a latent
electrostatic image. Upon receipt of a
BD signal from the DC
controller,
VDO data is sent from the formatter for each scan line
of print data on a page.
Before the next sheet of paper arrives, the voltage on the transfer
roller switches from the nominal standby voltage to a positive
high voltage, to prepare to transfer the toner image from the
drum to the paper. The process repeats for each successive page
as necessary.
If a failure occurs during this period, the following errors may be
displayed:
41 ERROR This error occurs when a sheet of paper is fed too
soon or when an unstable
BD or TOP signal is
received (see “41.x ERROR” message in Chapter 7).
50 SERVICE This error occurs when the fusing roller fails to
rise to the correct temperature in the required
time (see “50 SERVICE”) in Chapter 7).
51 ERROR This error occurs when the
BD signal is not
received by the DC controller (see “51 ERROR” in
Chapter 7).
52 ERROR This error occurs when the scanner motor fails
(see “52 ERROR” in Chapter 7).
Functional Overview 5-41