Oki OKIFAX4550 Maintenance Manual page 276

(2) R46 board (OKIOFFICE87)
• CPU SH7034
Basic processor
CPU periheral functions
• IOGA6 (Input/output gate array 6) 1/3, 2/3, 3/3
Scanned data DMA control
Printing control
Peripheral input/output control
• Flash memory (Instead of EP-ROM and SRAM)
Memory storage for program code
Memory storage for user/service setting data
• 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
• LC821033
Image data processing
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
• Drum motor control
• Modem chip
Modulation and demodulation for V.34
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
(3) 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
(4) NCU board
INU-US
EN9
INU-INT
• Conversion of receive data and receive signals to internal signal level
• Conversion of send data and send signals to external signal level
• Generation of dial pulses to telephone line
• Detection of ringing signal
• Detection of busy tone (conjunction with Modem unit)
• Detection of hook up signal
• Interface with telephone handset (option)
• Output of send data and send signals to telephone line
• Input of receive data and receive signals from telephone line
41309401TH Rev.4
For US and Canada
For Denmark, Norway, Sweden, Finland, The Netherlands, ireland, portugal,
Belgium, Spain, Greece and Other countries, Germany, Switzerland and Austria,
France and UK
For New Zealand, Australia and Other countries
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