APPENDIX 3 FIRMWARE SWITCHS (WSW)
A-26
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
Chattering noise elimination at
detection of CNG
No. 6 7
0
0 :
Yes (When CNG goes either
ON or OFF)
0
1
:
Yes
(Only when CNG goes OFF)
1
0
:
No
1
1
:
No
8
CNG detection on/off
0: OFF
1: ON
* EP: Echo protection
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Selector 1: EP tone prefix
Setting this selector to "1" makes the machine 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 effective when the machine fails to transmit at the V.29 modem speed
and always has to fall back to 4800 bps transmission.
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Selectors 2 and 3: Overseas communications mode
These selectors should be used if the machine malfunctions in overseas communications.
According to the communications error state, select the signal specifications.
Setting selector 2 to "1" allows the machine 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 machine 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.
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Selectors 8: CNG detection on/off
If this selector is set to "1," the machine 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
machine detects a CNG signal as long as the line is connected.
Summary of Contents for MFC-8220
Page 60: ...MFC 8220 SERVICE MANUAL 3 5 1 3 4 ROM Fig 3 6 ...
Page 244: ...CHAPTER 7 MAINTENANCE MODE 7 6 Fig 7 2 a b c d e f g h i j ...
Page 312: ...APPENDIX 4 CIRCUIT DIAGRAM A 48 Appendix 4 1 Main PCB Circuit Diagram 1 6 ...
Page 313: ...MFC 8220 SERVICE MANUAL A 49 Appendix 4 2 Main PCB Circuit Diagram 2 6 ...
Page 314: ...APPENDIX 4 CIRCUIT DIAGRAM A 50 Appendix 4 3 Main PCB Circuit Diagram 3 6 ...
Page 315: ...MFC 8220 SERVICE MANUAL A 51 Appendix 4 4 Main PCB Circuit Diagram 4 6 ...
Page 316: ...APPENDIX 4 CIRCUIT DIAGRAM A 52 Appendix 4 5 Main PCB Circuit Diagram 5 6 ...
Page 317: ...MFC 8220 SERVICE MANUAL A 53 Appendix 4 6 Main PCB Circuit Diagram 6 6 ...
Page 318: ...APPENDIX 4 CIRCUIT DIAGRAM A 54 Appendix 4 7 Engine PCB Circuit Diagram 1 2 ...
Page 319: ...MFC 8220 SERVICE MANUAL A 55 Appendix 4 8 Engine PCB Circuit Diagram 2 2 ...
Page 320: ...APPENDIX 4 CIRCUIT DIAGRAM A 56 Appendix 4 9 NCU PCB Circuit Diagram Europe ...
Page 321: ...MFC 8220 SERVICE MANUAL A 57 Appendix 4 10 NCU PCB Circuit Diagram U S A ...
Page 322: ...APPENDIX 4 CIRCUIT DIAGRAM A 58 Appendix 4 11 Control Panel PCB Circuit Diagram ...
Page 323: ...MFC 8220 SERVICE MANUAL A 59 Appendix 4 12 Low voltage Power Supply PCB Circuit Diagram ...
Page 325: ...MFC 8220 SERVICE MANUAL A 61 Appendix 4 14 High voltage Power Supply PCB Circuit Diagram 200V ...
Page 326: ...APPENDIX 4 CIRCUIT DIAGRAM A 62 Appendix 4 15 Back Light PCB Circuit Diagram ...
Page 328: ...February 04 SM FAX026 6 8X5913 Printed in Japan ...