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1. Upon receiving a print command from the formatter, the DC controller outputs the
SCANNER MOTOR SPEED CONTROL signals (Y/M: /ACC1, /DEC1 C/Bk: /ACC2, /
DEC2) and rotates the scanner motor to rotate two four-faced mirrors.
NOTE
The abbreviations Bk and K are used interchangeably and refer to the black developing
operation.
2. When the scanner motor starts rotating, the DC controller outputs LASER CONTROL
signals (CTRL10~40, CTRL11~41) and emits a laser beam to input BD INPUT signals (/
BD21, /BD41).
NOTE
The DC controller monitors and controls the rotation speed of the scanner motor according
to the timing the /BDI signals are input to be the specified speed.
3. When the scanner motor rotates at the specified speed, the DC controller passes on the
VIDEO signals from the formatter to the laser driver circuit. The laser driver circuit emits
the laser diode according to the VIDEO signals (/VDO1~4, VDO1~4).
4. The laser beam strikes the four-face mirror rotating at a constant speed through the
collimator lens and the cylindrical lens.
5. The laser beam reflected off the four-face mirror passes through the focus lens and
scans on the photosensitive drum at a constant speed.
6. When the photosensitive drum rotates and the laser beam scans on it, both at a
constant speed, a latent image is formed on the photosensitive drum.
NOTE
This printer has two scanner motors and generates two /BDI signals. The /BDI signal for Y
and M’s scanner motor is generated by the M laser’s reflected light, and the BDI signal for C
and K’s scanner motor, by the K (black) laser’s reflected light.
NOTE
This printer scans two lines with one scanner mirror. The scanning direction depends on the
color. (Y and C: left to right, M and K: right to left)
Laser control
The laser control instructs the laser driver to turn on/off the laser diode according to the
LASER CONTROL signal sent from the DC controller.
140 Chapter 5 Theory of operation ENWW