Unc, Wn5, Fn5 And Dn5 Circuit Diagram - Oki OF5900 Maintenance Manual

UNC/WN5/FN5/DN5
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.
2.
OKIFAX 5700/5900
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.
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
amplification.
• 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.
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