ENWW Laser/scanner system 131
The following is the sequence of the printing process:
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)
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