Oki B 4100 Maintenance Manual page 366

A1.2 Function of Each Unit
The section describes the principal functions of the individual units of the OKIOFFICE44/OKIFAX
4100/5000 series electrical sections.
Figure A1.2.1 and A1.2.2 shows the pertinent block diagram.
(1) R44 (OKIOFFICE44/OKIFAX 4100)/(OKIFAX 5500/5600: M17 for ODA/M17-2 for INT'L)
(OKIFAX 5200/5300: M17-3 for ODA/M17-4 for INT'L) 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
(2) Operation panel unit: O4W (OKIOFFICE44/OKIFAX 4100)/05W (OKIFAX 5000 series) 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
40055101TH Rev.4
366 /