Page: 123
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.
Содержание OF1050
Страница 51: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 65: ...Figure 2 3 1 Unpacking Procedure 2...
Страница 80: ......
Страница 81: ......
Страница 120: ...Page 60 Service Guide OF1050 2350 2450 Chapter 2 Setup Information Users Initial Settings One Touch Key Operations...
Страница 142: ...Page 70 Service Guide OF1050 2350 2450 Chapter 2 Setup Information 2 9 7 Dual Access Operation for OKIFAX 2350 2450...
Страница 145: ...Note Use the UNIQUE key to input special symbols Operations Press the START key Press the START key...
Страница 152: ...Case 2 Canceling member s from a group...
Страница 160: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 167: ...Page 84 Service Guide OF1050 2350 2450 Chapter 2 Setup Information Fig 2 9 5 Typical Transmission Flow...
Страница 209: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 224: ...NCUU Package Layout OKIFAX 1050 2350 2450 Figure 3 10 1 Block Diagram of NCUU...
Страница 319: ...Figure 6 14 1 Protocol Dump Data Sample at transmitter side...
Страница 326: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 332: ...Page 181 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 1 Overall Troubleshooting Flow Chart...
Страница 337: ...Page 185 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 5 No Local Copy...
Страница 344: ...Page 188 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 8 Auto Reception Failure...
Страница 350: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 351: ...Page 191 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 11 LED Test...
Страница 354: ...Page 193 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 13 High speed Modem Test...
Страница 360: ...Page 198 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 18 No Document Feeding...
Страница 363: ...Page 200 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 20 Document Skew...
Страница 365: ...Page 201 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 21 Document Jam...
Страница 388: ...Page 218 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
Страница 390: ...Page 219 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 2350 2450...
Страница 392: ...Page 220 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
Страница 394: ...Page 221 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 2350 2450...
Страница 395: ...Section 1 Cabinet Illustratio n Number OKIFAX Description Okidata Part Number Oki Part Number...
Страница 398: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 400: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 401: ...Page 224 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 2450 Section 2 Control...
Страница 409: ...Page 227 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
Страница 414: ...Page 229 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050 2350 2450 Section 5 Scan Unit...
Страница 417: ...Page 230 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050 2350 2450...
Страница 418: ...Section 6 Paper Guide Illustratio n No OKIF AX Description Okidata Part Number Oki Part Number...
Страница 421: ...Page 231 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
Страница 423: ...Page 232 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 2350 2450...
Страница 424: ...Section 7 Cables Illustratio n No OKIF AX Description Okidata Part Number Oki Part Number...
Страница 445: ...Page 245 Service Guide OF1050 2350 2450 Chapter 9 High Capacity Second Paper Feeder Maintenance 9 6 Parts List...
Страница 446: ......
Страница 447: ......
Страница 448: ...Figure 6 1 High Capacity Second Paper Feeder...