
App. 4-23
WSW20
(Overseas communications mode setting)
Selector
No.
Function
Setting and Specifications
1
EP* tone prefix
0: OFF
1: ON
2
Overseas communications
mode (Reception)
0: 2100 Hz
1: 1100 Hz
3
Overseas communications
mode (Transmission)
0: OFF
1: Ignores DIS once.
4
5
Min. time length from
reception of CFR to start of
transmission of video signals
No. 4
5
0
0 :
100
ms
0
1 :
200
ms
1
0 :
300
ms
1
1 :
400
ms
6
7
Not used.
8
Limitation on CNG detection
0: No
1: Yes
* EP: Echo protection
Selector 1:
EP tone prefix
Setting this selector to "1" makes the equipment transmit a 1700 Hz echo protection (EP) tone
immediately preceding training in V.29 modulation system to prevent omission of training signals.
Prefixing an EP tone is useful when the equipment fails to transmit at the V.29 modem speed and
always has to fall back to 4800 bps transmission.
The setting made by this selector takes effect only when the Overseas Mode is set to ON.
Selectors 2 and 3: Overseas communications mode
These selectors should be used if the facsimile equipment malfunctions in overseas
communications. According to the communications error state, select the signal specifications.
Setting selector 2 to "1" allows the equipment to use 1100 Hz CED signal instead of 2100 Hz in
receiving operation. This prevents malfunctions resulting from echoes, since the 1100 Hz signal
does not disable the echo suppressor (ES) while the 2100 Hz signal does.
Setting selector 3 to "1" allows the equipment to ignore a DIS signal sent from the called station
once in sending operation. This operation suppresses echoes since the first DIS signal immediately
follows a 2100 Hz CED (which disables the ES) so that it is likely to be affected by echoes in the
disabled ES state. However, such a disabled ES state will be removed soon so that the second and
the following DIS signals are not susceptible to data distortion due to echoes. Note that some
models when called may cause error by receiving a self-outputted DIS.
The setting made by selector 3 takes effect only when the Overseas Communications Mode is set
to ON. (The setting made by selector 2 is always effective.)
Selectors 8: Limitation on CNG detection
If this selector is set to "1," the equipment detects a CNG signal according to the condition preset
by selectors 2 and 3 of WSW18 after a line is connected. If it is set to "0," the equipment detects a
CNG signal as long as the line is connected.
Содержание MFC-4820C
Страница 1: ...FACSIMILE EQUIPMENT SERVICE MANUAL MODEL MFC4820C MFC4420C ...
Страница 6: ...CHAPTER 1 PARTS NAMES FUNCTIONS ...
Страница 13: ...CHAPTER 2 SPECIFICATIONS ...
Страница 19: ...2 5 2 1 4 Environmental Conditions ...
Страница 26: ...CHAPTER 3 SETTING UP OF THE MACHINE ...
Страница 29: ...3 2 3 2 UNPACKING THE MACHINE The equipment consists of the following major components ...
Страница 40: ...CHAPTER 4 THEORY OF OPERATION ...
Страница 76: ...CHAPTER 5 ROUTINE MAINTENANCE ...
Страница 84: ...CHAPTER 6 DISASSEMBLY REASSEMBLY ...
Страница 114: ...6 29 6 1 11 Speaker 1 Pull the speaker and its spring out of the lower cover ...
Страница 136: ...CHAPTER 7 MAINTENANCE MODE ...
Страница 145: ...7 8 Scanning Compensation Data List ...
Страница 160: ...7 23 1st sheet 2nd sheet Vertical Alignment Check Patterns and Head Skew Check Pattern ...
Страница 162: ...7 25 Margin Check Patterns ...
Страница 170: ...CHAPTER 8 ERROR INDICATION AND TROUBLESHOOTING ...
Страница 196: ...8 25 3 Pull up the jammed paper to remove it Jammped paper 4 Reinstall the paper tray Paper tray ...
Страница 197: ...MFC4820C MFC4420C Appendix 1 Serial No Descriptions ...
Страница 204: ...App 2 3 Select the folder where the Downloader driver is located then click OK Click Next Click Yes ...
Страница 205: ...App 2 4 Click Finish to return to Windows ...
Страница 209: ...MFC4820C MFC4420C Appendix 3 EEPROM Customizing Codes ...
Страница 212: ...MFC4820C MFC4420C Appendix 4 Firmware Switches WSW ...
Страница 252: ...App 4 40 WSW48 to WSW50 Selector No Function Setting and Specifications 1 8 Not used ...
Страница 253: ...MFC4820C MFC4420C Appendix 5 Re Packing Instructions ...
Страница 255: ...App 5 2 2 Place the machine in the original box with the original packaging material ...
Страница 256: ...MFC4820C MFC4420C Appendix 6 Wiring Diagram ...
Страница 259: ...A Main PCB 1 5 ...
Страница 260: ...A Main PCB 2 5 ...
Страница 261: ...A Main PCB 3 5 ...
Страница 262: ...A Main PCB 4 5 ...
Страница 263: ...A Main PCB 5 5 ...
Страница 264: ...B Driver PCB ...
Страница 265: ...C NCU PCB ...
Страница 266: ...D Control Panel PCB ...
Страница 267: ...E Power Supply PCB ...
Страница 268: ...Feb 03 SM FAX016 8CA602 Printed in Japan ...