A substrate on which the four-sided polygon mirror, etc are mounted: A motor driver IC (Sanyo Semiconductor Co Ltd's LB11870) for rotating the polygon mirror is mounted in the center.
A substrate on which the four-sided polygon mirror, etc are mounted: A motor driver IC (Sanyo Semiconductor Co Ltd's LB11870) for rotating the polygon mirror is mounted in the center.

[Breaking Down Samsung's Printer] 'Oh, I found a Slug!' [Part 5]