Oki OKIOFFICE44 Service Manual page 265

A3.1.2 R44 Circuit Diagram
1. Block diagram
The circuit diagram consists of an input/output gate array IC2 (IOGA3).
Figure A3.1.2 shows the related signals of IOGA3.
2. Functions
IOGA3 is a newly developed LSI for scanning and printing control of the OKIOFFICE 44.
IOGA3 contains the following functions:
A4 image
sensor
Data/address bus
Various sensor
Data/address bus
Data/address bus
Board Descriptions
• Scanning sensor control
• Send motor control
• Various image data processing control for scanning data
• Strobe signals control for LED head
• Smoothing control for printing data
• Interface of the peripheral LSI, optional memory and CPU
(RLE, TIFF, ACC32)
Related Signals of IOGA (Figure A3.1.2)
A - 23
1/4
Scanning
control
2/4
Printer control
OST-EX
Buffer 640 bytes
Decoding
200-300 converter
smoothing
3/4
High-voltage
controller
4/4
Peripheral control
1284 control
CS generation
I/O port
OKIOFFICE 44 Serv. Man., P/N 59276801
Data/address bus
M S-motor
LED head
TLHV/OLHV
High-voltage
power supply
CTR
Bi-Centro
I/F
OPE unit
Speaker