Samsung Inkjet SCX-1150F, Руководство по ремонту

Страница: 32 / 66

3-29
Samsung Electronics
CIRCUIT DESCRIPTION
Repair Manual
3-6 CCD MODULE and ADC Part
3-6-1 CCD Module General Description
CCD Module has the structure transferring RGB data to
be converted into the digital signal through ADC on the
basis of the level of analog signal to OA-980, the Image
Processor, which divides the signals reflected by emitting
light to document into R, G, B data according to each fre-
quency.
The voltage used in the CCD Module are 11.75V for ana-
log signal of RGB, 5V as input for CCD and other ele-
ments. The input part of CCD Module consists of
CCD_TG, CCD_CLK1,CCD_CLK2 and CCD_RS, the
output of OA-980(U21), CCD_TG controls the scan line,
which is set variously according to copy mode, color and
mono, and scan resolution. CCD_CLK1 and CCD_CLK2
are clocks by each pixel, CD_RS is reset signal of each
pixel. Since the pixel of 1/2 cycle of CCD_CLK1 and
CCD_CLK2 is sampled, color signal sends RGB data to
output for 1/2 cycle, and controls the pixel of 1/2 cycle for
mono. Therefore, the output signal from the CCD Module
classifies the signals received by RGB channel according
to each frequency band and uses each video
signal(CN1) as the input data of ADC(U16).
TG, CLK,RS to be used are as follows.
< TG, CLK,RS >
Color Copy Mono Copy
CCD_TG 5mS 2.5mS
CCD_CLK1,CCD_CLK2 1.6uS 800uS
CCD_RS 800uS 400uS
< TG, CLK,RS >