Board Descriptions
A - 6
OKIOFFICE 44
Service Manual, P/N 59276801
A1.2
Function of Each Unit
The section describes the principal functions of the individual units of the OKIOFFICE44 electrical
sections.
Figure A1.2.1 shows the pertinent block diagram.
Main Control (R44) Board
•
CPU
Basic processor
Scanning control
Picture processing control
Printing control
SIO (Serial input/output) control
•
IOGA (Input/output gate array)
Scanning control
Printing control
Peripheral input/output control
•
Flash memory (Instead of EP-ROM and SRAM)
Memory storage for work area.
•
DRAM
Memory storage for ECM operations, memory broadcast, delayed broadcast, etc.
•
Back-up battery circuit
•
Real-time clock IC
•
Audio monitor circuit
•
Contact image sensor control
•
I EXSEED (For OKIFAX 5000 series)
Image data processing
•
SRAM (For OKIFAX 5000 series)
Memory storage for image picture data
•
Supervision of the following external statuses:
Presence of document on hopper
Presence of document at scanning position
•
Send motor control
•
Fan motor control
•
Drum motor control
•
Resist motor control
•
Modem chip/Modem board (For OKIFAX 5500/5600)
Modulation and demodulation for V.34 (for OKIFAX 5500/5600)
Modulation and demodulation for V.33 and V.17
Modulation and demodulation for V.29 and V.27 ter
Modulation and demodulation for V.21
Generation of single-frequency signals for tonal signals
Detection of single-frequency tonal signals
Generation of dual time multiple-frequency signals for tone dialing
Operation Panel Unit: O4W Board
•
Supervision of switches on operation panel
•
Control of LEDs on operation panel
•
Control of LCD on operation panel
LED : Light-emitting diode
LCD : Liquid crystal display
Summary of Contents for OKIOFFICE 44
Page 2: ...All specifications are subject to change without notice Service Manual OKIOFFICE 44 59276801...
Page 135: ...Disassembly 4 6 OKIOFFICE 44 Service Manual P N 59276801 Whole Unit Picture FX048 CP4 1 Fig 01...
Page 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Page 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Page 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
Page 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Page 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Page 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
Page 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...