Samsung SCX-4200 Series Service Manual page 40

System Overview
3.3.4 Functional Requirements for LSU Control
LSU receives the image data from PVC and make the latent image on OPC surface.
It uses the single beam .
The Eiger has many different registers for LSU. These registers are in manual book of CHORUS2, the CPU of the
Eiger.
3.3.4.1 LSU Ready Check
The Eiger will pick up the paper when the LSU is ready. And when the paper picked up meets the feed sensor, it will
check whether the LSU is ready or not and the Hsync is detected or not for appointed time.
3.3.4.2 Sequence of LSU module
The laser scanning unit control is executed when engine control module receives print command.
- Setting up the initial value
- With above results, it controls the polygon motor and laser diode when receives print command.
- With above results, it monitors register value related to LReady and Hsync, and if the error happens, it sets up the
error flag
- If no error happens with above results, set up the values to mask the video data for horizontal and vertical region
but if happens, it will be recovered according to the recovery sequence.
Service Manual
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