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Service Guide OF1050/2350/2450
Chapter 3 Board Description/Printer Operation
3.10 NCU Board
Explanation of NCU circuit diagram
This section briefly describes functional blocks of the NCU circuit diagram.
NCUU circuit diagram
Receiving Sensitivity
The receiving sensitivity is determined by the operational amplifier IC2.
Transmission Level
The transmission level is determined by operational amplifier IC2 and peripheral resistors and capacitors.
Ring Detection
The AC ring signal is converted to the secondary low voltage signal by photocoupler IC3, and output to the
MCNT as signal RI. This notifies the MCNT that a call is incoming.
Off Hook Detection
The OFF HOOK signal is converted to the secondary, low voltage signal by photocoupler IC1, and output
to the MCNT as signal HUP1. This notifies the MCNT that the phone line is off hook.
Relay Driver Circuit
CML (RL1 and RL4 relay) signal Relays RL1 and RL4 switch the line from telephone side to facsimile side.
DP (RL2 relay) signal
Relay RL2 generates dial pulses when calling a remote machine by auto-dialing under the control of DP
signal on/off from output port (IOGA).
SR (RL3 relay) signal
Relay RL3 is used to detect hook-up of external telephone set.
Telephone Interface
Connectors CN1 and CN2 are used to provide an interface between the fax and telephone line.
Internal telephone set (optional) is connected across terminals of TEL1-L1 or TEL1-L2 by an
RJ11-C modular jack.
External telephone set is connected across terminals of TEL2-L1 or TEL2-L2 by an RJ11-C modular jack.
Telephone exchange is connected across terminals LINE-L1 and LINE-L2 by an RJ11-C modular jack.
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 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...
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Page 395: ...Section 1 Cabinet Illustratio n Number OKIFAX Description Okidata Part Number Oki Part Number...
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