Toshiba 3511, 4511 manual LGC Board PWA-F-LGC-350, Laser Driving PC Board LDR Board

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7.4 LGC Board (PWA-F-LGC-350)

7.4.1 Features

(1)The image processing ASIC on the LGC board is controlled by CPU mounted on the LGC board.

(2)The image processing functions of the LGC board realizes the followings:

•Smoothing processing

•Image area control

•Laser related control

7.4.2 Functions of image processing circuit

An image processing ASIC mounted on the LGC board enables the following functions:

(1)Smoothing processing

This function removes jaggy and smoothes character outline of images and output them.

(2)Image area control

This function sets the effective image area in horizontal and vertical directions to be output.

(3)Laser related control

This function performs the APC (Auto Power Control).

7.5 Laser Driving PC Board (LDR Board)

Image signals processed on the LGC board are processed by ASIC for writing control and LDR board. The signal is then laser controlled and written on the drum.

(1) Setting of effective image area • Top, bottom, left and right margins

(2)	Horizontal synchronization signal (HSYNC)	•
	clock generation section
(3)	Laser drive section	•

Reference clock signal in the printer section synchronized with HSYNC and its signal.

ON/OFF control of the semiconductive laser and APC (Auto Power Control).

e-STUDIO3511/4511 IMAGE PROCESSING 7 - 10 November 2003 © TOSHIBA TEC