Canon LBP-3260 Service Manual page 62

CHAPTER 2
2. Operation
When the power is switched ON, the printer enters WAIT mode.
At the end of the WAIT mode, the DC controller sends the READY signal (/RDY) to the video
controller to inform it that printer is ready to print.
When the /RDY signal is "L" and data for a page is prepared, the video controller sends the
PRINT signal (/PRNT) to the DC controller.
When the DC controller receives the /PRNT signal, it starts the operation of the INITIAL
ROTATIONS (INTR) period.
At the end of the INTR period, the DC controller sends the VERTICAL SYNC REQUEST sig-
nal (/VSREQ) to the video controller.
The video controller receives the /VSREQ signal, and sends the VERTICAL SYNC signal
(/VSYNC) to the DC controller. When the /VSYNC signal is received, the print sequence is start-
ed.
The video controller sends the VIDEO signals (VDO, /VDO) synchronized with the HORI-
ZONTAL SYNC signal (/BD) and VERTICAL SYNC signal (/VSYNC) from the DC controller to the
laser driver through the DC controller.The VIDEO signals (VDO, /VDO) are sent to the laser dri-
ver as two low-voltage differential signals.
In response to the VIDEO signals (VDO, /VDO), the laser driver switches the laser diode ON
and OFF.
The laser beam is scanned repeatedly across the photosensitive drum with the scanning mir-
ror to form the latent electrostatic image of the original image.
The latent electrostatic image on the photosensitive drum is transferred onto the paper in the
electronic photographic process, and the paper is sent out through the face-down or face-up
trays.
When a page is being printed, the DC controller checks for other /PRNT or /VSYNC signals
from the video controller.
If none have arrived, the DC controller begins operation of the last rotations period (LSTR).
At the end of this period, the printer enters standby (STBY) mode.
If other /PRNT or /VSYNC signals arrive-during printing, the print sequence continues. The
last rotations operation is performed and the printer enters standby mode.
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