Oki OF5600, Service Manual

Page: 305 / 448

Board Descriptions A - 21 OF 5300/5600 Serv Man, P/N 59278301
A3.2.2 M17 Circuit Diagram
1. Block diagram
The circuit diagram consists of an input/output gate array IC2 (IOGA3).
Figure A3.2.2 shows the related signals of IOGA3.
2. Functions
IOGA3 is newly developed LSI for scanning and printing control of OKIFAX 5000 series.
IOGA3 contains the following functions:
•
Strobe signals control for LED head
• Smoothing control for printing data
• Interface of the peripheral LSI and CPU
3. Others
1) The route to transfer print data to the LED head is follows:
• Data bus route: RX, Memory, Report mode, etc.
2) System clock (CLK) is divided by IOGA3 and these divided clocks are transferred
to the IEXSEED (IC20), LED head and 2’nd tray.
IOGA3
Data bus HDATA
System clock
(20.000 MHz)
HCLCK (6.67 MHz/10MHz): to LED head
OPCLK-N (156.25 kHz): to 2'nd tray
AD00
to
AD15
Related Signals of IOGA (Figure A3.2.2)
Data/address bus
Printer control
OST-EX
Buffer 640 bytes
Decompressed
(RLE, TIFF, ACC32)
200-300/300-200 con-
verter
High-voltage control
smoothing
Various sensor
M D-motor
2/2
LED head
Power supply
unit
Fan
Data/address bus
Peripheral control
1284 control
CS generation
I/O port
1/2
Bi-Centro
I/F
CTR
OPE unit
2nd tray
Speaker
DRV
M
R-motor
DRV