Oki OKIOFFICE 84 Service Manual page 363

Main Control (R51) Board
l
IOGA4 (Input/output gate array 4) 1/4: CPU SH7034
Basic processor
Scanning control
Picture processing control
Printing control
SIO (Serial input/output) control
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IOGA4 (Input/output gate array 4) 2/4, 3/4, 4/4
Scanning control
Printing control
Peripheral input/output control
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Flash memory (Instead of EP-ROM and SRAM)
Memory storage for work area.
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DRAM
Memory storage for ECM operations, memory broadcast, delayed broadcast, etc.
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Back-up battery circuit
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Real-time clock IC
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Audio monitor circuit
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Contact image sensor control
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I EXSEED300
Image data processing
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SRAM
Memory storage for image picture data
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Supervision of the following external statuses:
Presence of document on hopper
Presence of document at scanning position
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Send motor control
l
Drum motor control
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Modem chip
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
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Service Guide OKIOFFICE 84
Chapter A Board Descriptions
Page: 210