Oki OKIFAX 5400, Maintenance Manual

Page: 287 / 448

E17
40838301TH Rev.1 A3 - 6
A3.1.5 E17 Circuit Diagram
1. Block diagram
The circuit diagram shown on page 5/16 consists of the IEXSEED300 (image processing LSI)
of IC20 and SRAM.
Figure A3.1.5 shows the related signals of IEXSEED300.
2. Functions
IEXSEED300 is developed LSI for the image processing.
IEXSEED300 contains the following functions:
•
Contact image sensor driver
• Send motor forward rotation/chopping control
• Line buffer control
3. SRAM
32 x 8 kbit SRAM x 1 (RAM1)
Stores the dark/light level correction data.
Error diffusion data and image separation data are processed by IEXSEED300.
IC20
A0 - A3
AD0 - AD15
Data Bus
SDT2 - SDT7
MAD0 - MADE
MDT 0 - MDT7
RAM1
SRAM
32 x 8 kbit
MRD, MWR
A/D convertor
IC6
PHSA-PHSD
IEXSEED300
MPT0-MPT3
DRV
CIS
PDCK (1.25MHz)
ADCLK (1.25MHz)
LEDON-P
MISP
CLK (20 MHz)
Contact
image
sensor
M S-motor
Address bus
Figure A3.1.5 Related Signals of IEXSEED300