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III. LASER/SCANNER SYSTEM
A. Laser System
1. Outline
Figure 2-3-1
The VIDEO signals (/VDO0 to /VDO7) are sent to the laser driver PCB in synchronization with
the PRINTER CLOCK signal (PCLK) generated from the BD INPUT signal (/BDIN) in the DC con-
troller. The laser driver pulse-width-modulates the video data to produce a PWM VIDEO DATA
signal (/VDATA).
The laser driver turns the laser diode ON and OFF according to the /VDATA signal and gen-
erates the modulated laser beam only when the LASER EMISSION ENABLE signal (/LSENB)
from the DC controller is “L”.
The modulated laser beam is aligned by a collimator lens and a cylindrical lens into a paral-
lel beam that strikes the scanning mirror that is rotating at constant speed.
2 - 37
CHAPTER 2
Photosensitive drum
BD PCB
BD mirror
Scanner motor
Laser driver
PCB
/BDIN
ILM
/LSYNC
LON
VOUT0~7
/ACC /DEC
Collimator lens
Cylindrical lens
Video controller PCB
/TOP
/VDO0~7
VCLK
VDOEN
/PRNT
DC controller PCB
Reflective mirror
Focusing lens
Six-faced prism mirror
/LSENB PCLK
Scanner driver
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