UNC/WN5/FN5/DN5
OKIFAX 5700/5900
A3 - 49
4.3
FN5 circuit diagram
1
Lightning arresters (AR1, 2)
The nominal operating voltage is 500 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.
3
Diode bridge (DB1)
This circuit rectifies the loop current so that the DC circuit characteristics are
not affected by a polarity change over the line.
4
DC circuits (Q3, R540, R541, C13, R9, R209)
These circuits provide DC characteristics according to the line requirements.
5
Impedance matching network (R523, R536, C503, R623, R636, C603)
This circuit matches the impedance between the line and equipment to reduce
reflection of transmitted signals.
It provides impedance (return loss) characteristics to meet the line requirement
using the S5-1 and 5-2.
6
Receiving sensitivity (R537, R539, R637, R639)
The receiving sensitivity at line hunting is determined by R539 or R639 and the
MF tone receiving sensitivity at parallel pickup is determined by R537 or R639.
The receiving sensitivity set using DIP switch S5-3 to S5-6.
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.
9
DP (IC5)
This circuit generates pulse dial signals.
0
MUTE (IC7)
During pulse dialing, this circuit closes to reduce the DC loop resistance.
A
PP (RL6)
When it detects MF or CNG tones without seizuring a line, it disconnects NT
(
5
) to increase the input impedance and also sets the receiving sensitivity.
B
MUTE (RL3)
During pulse dialing, this circuit opens to prevent pulse distortion caused by
capacitor C11. When it detects MF or CNG tones without seizuring a line, it
opens to increase the impedance.
C
Pickup RC (R590, 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 of RI having the same
frequency as the incoming RI.
Summary of Contents for OKIFAX 5700
Page 6: ...CHAPTER 1 GENERAL INFORMATION ...
Page 90: ...CHAPTER 2 INSTALLATION PROCEDURE ...
Page 102: ...OKIFAX 5700 5900 2 12 3 Document stacker Hang the document stacker onto hanging position ...
Page 204: ...OKIFAX 5700 5900 2 114 Typical Transmission flow ...
Page 205: ...OKIFAX 5700 5900 2 115 Typical Reception flow ...
Page 210: ...CHAPTER 3 BRIEF TECHNICAL DESCRIPTION ...
Page 218: ...CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY ...
Page 223: ...OKIFAX 5700 5900 4 5 Appearance of the OKIFAX 5700 5900 ...
Page 248: ...CHAPTER 5 ADJUSTMENTS ...
Page 252: ...CHAPTER 6 CLEANING AND MAINTENANCE ...
Page 278: ...CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIFAX 5700 5900 ...
Page 390: ...C34 OKIFAX 5700 5900 A3 40 IC201 Pin Assignment ...
Page 405: ...Appendix B DescriptionsofPrintOperation ThirdEdition December 1998 Oki Data Corporation ...
Page 427: ...Appendix C Not used at this time ...
Page 430: ...OKIFAX 5700 5900 D 1 Section 1 CABINET ASSEMBLY ...
Page 432: ...OKIFAX 5700 5900 D 3 Section 2 CONTROL PANEL ASSEMBLY ...
Page 434: ...OKIFAX 5700 5900 D 5 Section 3 PRINTER ASSEMBLY 53 54 ...
Page 437: ...OKIFAX 5700 5900 D 8 Section 4 BASE ASSEMBLY ...
Page 439: ...OKIFAX 5700 5900 D 10 Section 5 FRAME ASSEMBLY SCANNER L ...
Page 441: ...OKIFAX 5700 5900 D 12 Section 6 FRAME ASSEMBLY SCANNER U ...
Page 443: ...OKIFAX 5700 5900 D 14 Section 7 CABLES OPTION BOARDS ...
Page 445: ...Appendix E Not used at this time Oki Data Corporation ...
Page 446: ...Appendix F Not used at this time Oki Data Corporation ...
Page 447: ...Appendix G PC Loading FirstEdition February 1999 Oki Data Corporation ...
Page 465: ...Appendix H RMCS SYSTEM MANUAL For Model 30 FirstEdition Oki Data Corporation ...
Page 466: ......