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Service Guide OF1050/2350/2450
Chapter 3 Board Description/Printer Operation
3.5 Function of Each Board
The section describes the principal functions of the individual units of the OKIFAX 1050/2350/2450
electrical sections.
Figure 3.5.1 and 3.5.2 shows the pertinent block diagram.
3.5.01 Main Control (MCNT) R054/R050 (OKIFAX 1050)/R175 (OKIFAX 2350)/R175-2 (OKIFAX 2450)
board
CPU
Basic processor
Scanning control
Picture processing control
Printing control
SIO (Serial input/output) control
IOGA (Input/output gate array)
Image Sensor control
Image smoothing
Strobe signals control for LED head
Printer control
Peripheral input/output control (Second Tray Unit, PC Interface)
Flash ROM (Instead of EPROM and SRAM)
Memory storage for system program, user and technical function programming
and defaults
DRAM (For OKIFAX 1050)/P-SRAM (For OKIFAX 2350/2450)
Memory storage for ECM operations, memory broadcast, delayed broadcast,
etc.
Back-up battery circuit
Nonrechargable lithium battery supplies voltage to the real time clock which
maintains the system time and date clock.
Real-time clock IC
Used as a timepiece to display the date and time.
Audio monitor circuit
Contact image sensor control
I EXSEED (For OKIFAX 2350/2450)
Image data processing
SRAM (For OKIFAX 2350/2450)
Memory storage for image picture data Interface for optional memory, PC
Interface, HSLS
Supervision of the following external statuses:
Presence of document on hopper (ADF sensor PC1)
Presence of document at scanning position (ADF sendor PC2)
Send motor control
Fan motor control
Main motor control Registration motor control
Modem chip (For OKIFAX 1050) and Modem board (For OKIFAX 2350/2450)
Modulation and demodulation for V.33 and V.17 (For OKIFAX 2450 / OKIFAX
2350: Option)
Modulation and demodulation for V.29 and V.27 ter
Summary of Contents for OF1050
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Page 65: ...Figure 2 3 1 Unpacking Procedure 2...
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Page 152: ...Case 2 Canceling member s from a group...
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Page 224: ...NCUU Package Layout OKIFAX 1050 2350 2450 Figure 3 10 1 Block Diagram of NCUU...
Page 319: ...Figure 6 14 1 Protocol Dump Data Sample at transmitter side...
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Page 337: ...Page 185 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 5 No Local Copy...
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Page 351: ...Page 191 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 11 LED Test...
Page 365: ...Page 201 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 21 Document Jam...
Page 388: ...Page 218 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
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Page 395: ...Section 1 Cabinet Illustratio n Number OKIFAX Description Okidata Part Number Oki Part Number...
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Page 409: ...Page 227 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
Page 418: ...Section 6 Paper Guide Illustratio n No OKIF AX Description Okidata Part Number Oki Part Number...
Page 421: ...Page 231 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
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Page 424: ...Section 7 Cables Illustratio n No OKIF AX Description Okidata Part Number Oki Part Number...
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Page 448: ...Figure 6 1 High Capacity Second Paper Feeder...