UNC/WN5/FN5/DN5
OF5750/5950 Series January 2001
A3 - 42
A3.4 UNC, WN5, FN5 and DN5 Circuit Diagram
The NCU board is selected from UNC, WN5, FN5 and DN5 because it differs depending on
country’s specifications. Therefore, the NCU circuit diagram is destined for the following
countries.
• UNC circuit diagram
US and Canada.
• WN5 circuit diagram
Sweden, Finland, The Netherlands, Ireland, Portugal, New Zealand, Australia, Belgium,
Spain, Greece, Norway, Denmark, Italy, and other countries.
• FN5 circuit diagram
France and UK
• DN5 circuit diagram
Germany, Switzerland and Austria.
1. Block diagram
• Figure A3.4.1 shows a block diagram of UNC circuit.
• Figure A3.4.2 shows a block diagram of WN5 circuit.
• Figure A3.4.3 shows a block diagram of FN5 circuit
• Figure A3.4.4 shows a block diagram of DN5 circuit.
2. General functions of this circuit are as follows:
1) Generates and detects signals to be exchanged with a telephone exchange or
network in Phases A and E defined by ITU T.30.
• Loop formation for call origination
• Line current detection (see note 1) before call origination
• Dial tone detection (see note 1)
• Generation of dial pulses (see note 2)
• Busy tone detection (see note 1)
• Ringing signal detection
2) Sends various data and signals from the R51 board to the telephone line after amplifi-
cation.
• Picture data/Protocol/Tonal signals/PB tone, etc.
3) Sends the following signals received from the line to the R51 board as data after
amplification.
• Picture data/Protocol/Tonal signals, etc.
Note 1: This procedure may be omitted depending on the dial parameters.
Note 2: MF (Multi-frequency) tone is generated by the modem and transferred to the
telephone line via the NCU board.
Summary of Contents for OKIFAX 5950
Page 9: ...CHAPTER 1 GENERAL INFORMATION ...
Page 101: ...OF5750 5950 Series January 2001 1 92 1 6 21 NIC Information ...
Page 107: ...CHAPTER 2 INSTALLATION PROCEDURE ...
Page 264: ...CHAPTER 3 BRIEF TECHNICAL DESCRIPTION ...
Page 272: ...CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY ...
Page 277: ...OF5750 5950 Series January 2001 4 5 Appearance of the OKIFAX 5750 5950 ...
Page 302: ...CHAPTER 5 ADJUSTMENTS ...
Page 306: ...CHAPTER 6 CLEANING AND MAINTENANCE ...
Page 341: ...CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIFAX 5750 5950 ...
Page 400: ...Appendix A PC Board Descriptions and Operation ...
Page 491: ...Appendix B DescriptionsofPrintOperation ...
Page 513: ...Appendix C Not used at this time ...
Page 516: ...OF5750 5950 Series January 2001 D 1 Section 1 CABINET ASSEMBLY 27 28 29 ...
Page 518: ...OF5750 5950 Series January 2001 D 3 Section 2 CONTROL PANEL ASSEMBLY 11 ...
Page 520: ...OF5750 5950 Series January 2001 D 5 Section 3 PRINTER ASSEMBLY 53 54 31 10 55 52 34 56 ...
Page 523: ...OF5750 5950 Series January 2001 D 8 Section 4 BASE ASSEMBLY ...
Page 525: ...OF5750 5950 Series January 2001 D 10 Section 5 FRAME ASSEMBLY SCANNER L 31 30 33 32 ...
Page 527: ...OF5750 5950 Series January 2001 D 12 Section 6 FRAME ASSEMBLY SCANNER U ...
Page 529: ...OF5750 5950 Series January 2001 D 14 Section 7 CABLES OPTION BOARDS ...
Page 530: ...OF5750 5950 Series January 2001 D 15 28 29 Section 7 CABLES OPTION BOARDS ...
Page 532: ...Appendix E Not used at this time ...