Samsung SF11OT, Servise Manual

Page: 22 / 87

Circuit Description
Input Processor
To process the B/W input signal, maximum
and minimum values of the
input signal are controlled by calibrating
and in the high state for the maximum
level, and setting them to earth for the minimum
level.
Processing to compensate for shading
distortion is controlled with ‘low’ and
‘high’. For B/W mode, should be
‘high, and ‘low’. For half-tone, is
‘low’, and is ‘high’.
External Circuits
. . . . . . . . . . . . . . . . . . ,
Shading RAM
Scanner Image
Processing
: E x t e r n a l
RAM :
Line Buffer
. RAM
Scanner
Figure Scanner Interface Block Diagram
Driver
The driver clock frequency is A
duty cycle is used to lengthen the charging time. A
start signal is provided every to match the
line scanning time. Actual image signal is
provided in less than using the
clock and taking paper size into consideration.
KHZ
C L O C K
1 LINE
Electronics