UNC/WN5/FN5/DN5
40838301TH Rev.1
A3 - 35
4.
Description on the NCU Block Diagram
4.1
UNC circuit diagram
1
Lightning arresters (AR1, 2)
The nominal operating voltage is 350 V.
When connecting the ground of the arrestor to the chassis, tighten ARG on the PCB
with a screw. At this time, the PCB is grounded through the power cable.
The TB1 arrestor ground terminal can also be used to connect to the earth directly.
4
DC circuits (R10, R11, C4)
These circuits provide DC characteristics according to the line requirements using the
primary DC resistor in the line transformer T1 and the R10 and R11 resistors . The
capacitor C4 bypasses AC signals.
5
Impedance matching network (R523, R536, C503)
This circuit matches the impedance between the line and equipment to reduce
reflection of transmitted signals.
6
Receiving sensitivity (R574, R504)
The receiving sensitivity at line seizuring is determined by R574 and the MF tone
receiving sensitivity at parallel pickup is determined by R504.
7
CML (RL1)
This circuit selectively switches the line between the telephone or facsimile.
8
SR (RL2)
This circuit connects the line with the telephone. During facsimile transmission, it
disconnects the telephone.
A
PP (RL6)
If this circuits detects MF or CNG tones without seizuring a line, it sets a proper
receiving sensitivity.
B
DP (RL3)
This circuit generates pulse dials.
If the circuit detects MF or CNG tones without seizuring a line, it opens to increase the
impedance.
C
Pickup RC (R5, C31)
These circuits insert a high-impedance resistor and capacitor serially to prevent the
line impedance from dropping by the line transformer T1.
D
Ring detectors (IC1)
These circuits detect a ring signal arriving to the line. If the input ring signal exceeds
a specific voltage, the circuits output a signal having of RI the same frequency as
incoming RI.
E
Line transformer (T1)
This circuit processes send/receive signals required for facsimile transmission, dial
tone receive signals required for automatic dialing, and MF tone send and remote
receive signals. It separates between the line and equipment in terms of DC and also
keeps a balance between the line and the ground. The transformer on the UNC board
for OKIFAX 5400 is covered with the shield case for the low-level receiving counter-
measure.
F
Off-hook detector (IC2)
This circuit detects the off-hook state of the telephone connected to the TEL1, TEL2
through LINE terminals.
Содержание OKIFAX 5400
Страница 7: ...40838301TH Rev 1 CHAPTER 1 GENERAL INFORMATION...
Страница 46: ...40838301TH Rev 1 CHAPTER 2 INSTALLATION PROCEDURE...
Страница 130: ...40838301TH Rev 1 CHAPTER 3 BRIEF TECHNICAL DESCRIPTION...
Страница 138: ...40838301TH Rev 1 CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY...
Страница 157: ...40838301TH Rev 1 CHAPTER 5 ADJUSTMENTS...
Страница 162: ...40838301TH Rev 1 CHAPTER 6 CLEANING AND MAINTENANCE...
Страница 189: ...40838301TH Rev 1 CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIFAX 5400...
Страница 240: ...40838301TH Rev 1 CHAPTER 8 DIPSWITCHS SETTING TABLES...
Страница 353: ...40838301TH Rev 1 Appendix B Descriptions of Print Operation First Edition August 1999 Oki Data Corporation...
Страница 375: ...40838301TH Rev 1 Appendix C Circuit Diagram and Parts List OK IFAX 5400 First Edition August 1999 Oki Data Corporation...
Страница 380: ...40838301TH Rev 1 D 2 SECTION 1 CABINET ASSEMBLY 5...
Страница 382: ...40838301TH Rev 1 D 4 SECTION 2 CONTROL PANEL ASSEMBLY...
Страница 384: ...40838301TH Rev 1 D 6 SECTION 3 PRINTER ASSEMBLY 51...
Страница 387: ...40838301TH Rev 1 D 9 SECTION 4 BASE ASSEMBLY 30 37 36 39 40 5...
Страница 390: ...40838301TH Rev 1 D 12 SECTION 5 SCAN UNIT...
Страница 392: ...40838301TH Rev 1 D 14 SECTION 6 PAPER GUIDE U ASSEMBLY...
Страница 394: ...40838301TH Rev 1 D 16 SECTION 7 CABLES 10 11 19 12 20 21...
Страница 396: ...40838301TH Rev 1 D 18 SECTION 8 OPTION TELEPHONE US...
Страница 399: ...40838301TH Rev 1 D 21 SECTION 8 OPTION TELEPHONE UK ITA NOR DEN BEL...
Страница 402: ...40838301TH Rev 1 D 24 SECTION 8 OPTION TELEPHONE HOL GER FRA SWITZ AUT INT L...
Страница 405: ...40838301TH Rev 1 Appendix E Board Layout OKIFAX 5400 First Edition August 1999 Oki Data Corporation...
Страница 424: ...40838301TH Rev 1 F 15 5 2 PCB Layout TQSB 2PCB PU FG CONTROLLER MOTOR DRIVER SEN2 MOTOR OSC SEN1...
Страница 425: ...40838301TH Rev 1 F 16 Figure 6 1 6 PARTS LIST SECTION1 CABINET CASSETTE ASSEMBLY F 16 1 4 P 6 5 8 7 3 O 1 2...
Страница 426: ...40838301TH Rev 1 F 17 SECTION2 MECHANICAL ASSEMBLY Figure 6 2 F 16 2 9 A 0 C M L D N E F G H U V T S Q R J I B K A A B B...
Страница 428: ...40838301TH Rev 1 Appendix G RMCS SYSTEM MANUAL For Model 20 First Edition August 1999 Oki Data Corporation...