(Causes and Countermeasures)
Fig. a (Overlapping the Echo of the DIS signal and DCS signal)
Fig. b (Countermeasure by Changing the CED Frequency)
No.
Countermeasure Side
Echo Communication Problem Example
Countermeasure
Service Code
1
Sending side
Some time is needed to compare the level
of the receiving and sending signals for the
echo canceler. The header of the training
signal lacks due to a switching delay to
close S1.
Add a dummy signal to the beginning
of the training signal.
Service code (521)
(International mode select)
This countermeasure
becomes the default value.
2
Receiving side
The
echo
canceler
function
stops
according to a CED signal frequency of
2100Hz (S1 and S2 are both ON), a DIS
signal is returned as an echo, and a DCS
signal from the sending side overlaps the
DIS echo. Then the receiving side FAX
cannot retrieve the DCS signal.
(Refer to Fig. a)
Change to a 1100Hz CED signal
frequency. (Refer to Fig. b)
Service code (520)
(CED frequency select)
Receiving side
Change the regular rime of 75 msec
between the CED signal and DIS signal
to 500 msec. This will give at least 250
msec to recover the echo canceler
operation. (Refer to Fig. c)
Service code (593)
(Time between CED and 300
bps)
Sending side
The sending side FAX sends a DCS
signal not after receiving the 1st DIS
signal but after receiving the 2nd DIS
signal. (Refer to Fig. d)
Service code (594)
(Overseas DIS detection
select)
3
Sending side
Communication failure occurs in a long
distance communication on the telephone
line without an echo canceler.
or
There are some cases (e.g. Mobil comms.)
which cause the collision of TX / RX signals
due to the delay / echo and noise of the
network / terminal. (Refer to Fig. e)
Decrease the transmission level from -
10 dBm to -15 dBm and the echo level
will decrease.
Service code (596)
(Transmit level set)
4
Sending side
Receiving side
Decrease the receiving sensitivity from
-13 dBm to about -32 dBm so an echo
signal will not received.
Service code (598)
(Receiving sensitivity)
5
Sending side
Receiving side
Set additional Pause time (Service
mode: code No. 774) in between the
original and its repeated signals, to
prevent the collision of the signals at
both end.
Service code (774)
(T4 timer)
67
KX-FT907BX-B / KX-FT907BX-W
Содержание KX-FT907BX-B
Страница 25: ...6 DISASSEMBLY INSTRUCTIONS 6 1 HOW TO REMOVE PAPER STACKER 25 KX FT907BX B KX FT907BX W ...
Страница 26: ...6 2 HOW TO REMOVE THE OPERATION PANEL BLOCK 26 KX FT907BX B KX FT907BX W ...
Страница 27: ...6 3 HOW TO REMOVE THE OPERATION BOARD AND LCD 27 KX FT907BX B KX FT907BX W ...
Страница 28: ...6 4 HOW TO REMOVE THE IMAGE SENSOR 28 KX FT907BX B KX FT907BX W ...
Страница 29: ...6 5 HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT 29 KX FT907BX B KX FT907BX W ...
Страница 30: ...6 6 HOW TO REMOVE THE DOCUMENT TRAY 30 KX FT907BX B KX FT907BX W ...
Страница 31: ...6 7 HOW TO REMOVE THE BOTTOM FRAME 31 KX FT907BX B KX FT907BX W ...
Страница 32: ...6 8 HOW TO REMOVE THE HANDSET CRADLE CABINET AND SPEAKER 32 KX FT907BX B KX FT907BX W ...
Страница 33: ...6 9 HOW TO REMOVE THE DIGITAL ANALOG AND POWER SUPPLY BOARD AND AC INLET 33 KX FT907BX B KX FT907BX W ...
Страница 34: ...6 10 HOW TO REMOVE THE ROLLERS 34 KX FT907BX B KX FT907BX W ...
Страница 35: ...6 11 HOW TO REMOVE THE MOTOR BLOCK 35 KX FT907BX B KX FT907BX W ...
Страница 36: ...CROSS REFERENCE HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT P 29 36 KX FT907BX B KX FT907BX W ...
Страница 37: ...37 KX FT907BX B KX FT907BX W ...
Страница 38: ...6 12 INSTALLATION POSITION OF THE LEAD WIRES 38 KX FT907BX B KX FT907BX W ...
Страница 39: ...6 13 INSTALLATION OF THERMAL HEAD 39 KX FT907BX B KX FT907BX W ...
Страница 51: ...7 4 6 SERVICE MODE SETTINGS Example of a printed out list 51 KX FT907BX B KX FT907BX W ...
Страница 57: ...7 5 4 4 SKEW CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 25 57 KX FT907BX B KX FT907BX W ...
Страница 63: ...7 5 5 1 2 SOMETIMES THERE IS A TRANSMIT PROBLEM 63 KX FT907BX B KX FT907BX W ...
Страница 65: ...7 5 5 1 4 THE UNIT CAN COPY BUT CANNOT TRANSMIT RECEIVE 65 KX FT907BX B KX FT907BX W ...
Страница 72: ...Countermeasure 72 KX FT907BX B KX FT907BX W ...
Страница 73: ...73 KX FT907BX B KX FT907BX W ...
Страница 74: ...74 KX FT907BX B KX FT907BX W ...
Страница 75: ...75 KX FT907BX B KX FT907BX W ...
Страница 76: ...76 KX FT907BX B KX FT907BX W ...
Страница 77: ...77 KX FT907BX B KX FT907BX W ...
Страница 78: ...78 KX FT907BX B KX FT907BX W ...
Страница 79: ...79 KX FT907BX B KX FT907BX W ...
Страница 84: ...84 KX FT907BX B KX FT907BX W ...
Страница 87: ...87 KX FT907BX B KX FT907BX W ...
Страница 90: ...7 5 8 3 NG EXAMPLE 90 KX FT907BX B KX FT907BX W ...
Страница 92: ...92 KX FT907BX B KX FT907BX W ...
Страница 94: ...Note Inside the digital board Inside the operation board 94 KX FT907BX B KX FT907BX W ...
Страница 95: ...7 5 9 2 DEFECTIVE ITS INTEGRATED TELEPHONE SYSTEM SECTION 95 KX FT907BX B KX FT907BX W ...
Страница 97: ...2 Troubleshooting Flow Chart 97 KX FT907BX B KX FT907BX W ...
Страница 101: ...CROSS REFERENCE TEST FUNCTIONS P 45 101 KX FT907BX B KX FT907BX W ...
Страница 103: ...8 CIRCUIT OPERATIONS 8 1 CONNECTION DIAGRAM 103 KX FT907BX B KX FT907BX W ...
Страница 105: ...8 2 1 GENERAL BLOCK DIAGRAM 105 KX FT907BX B KX FT907BX W ...
Страница 114: ...8 4 2 BLOCK DIAGRAM 114 KX FT907BX B KX FT907BX W ...
Страница 116: ...116 KX FT907BX B KX FT907BX W ...
Страница 122: ...8 4 6 3 4 COPYING CROSS REFERENCE SENSOR SECTION P 100 122 KX FT907BX B KX FT907BX W ...
Страница 132: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 132 KX FT907BX B KX FT907BX W ...
Страница 138: ...8 10 2 CIRCUIT DIAGRAM 138 KX FT907BX B KX FT907BX W ...
Страница 144: ...9 REFERENCE MATERIAL DATA 9 1 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 144 KX FT907BX B KX FT907BX W ...
Страница 148: ...Refer to ANALOG BOARD SECTION P 93 148 KX FT907BX B KX FT907BX W ...
Страница 149: ...9 3 TEST CHART 9 3 1 ITU T No 1 TEST CHART 149 KX FT907BX B KX FT907BX W ...
Страница 150: ...9 3 2 ITU T No 2 TEST CHART 150 KX FT907BX B KX FT907BX W ...
Страница 151: ...10 FIXTURES AND TOOLS 151 KX FT907BX B KX FT907BX W ...
Страница 152: ...11 CABINET MECHANICAL 11 1 OPERATION PANEL SECTION 152 KX FT907BX B KX FT907BX W ...
Страница 153: ...11 2 UPPER CABINET SECTION 153 KX FT907BX B KX FT907BX W ...
Страница 154: ...11 3 LOWER CABINET CROSS REFERENCE MOTOR SECTION P 155 154 KX FT907BX B KX FT907BX W ...
Страница 155: ...11 4 MOTOR SECTION 155 KX FT907BX B KX FT907BX W ...
Страница 156: ...11 5 ACTUAL SIZE OF SCREWS 156 KX FT907BX B KX FT907BX W ...
Страница 157: ...12 ACCESSORIES AND PACKING MATERIALS 157 KX FT907BX B KX FT907BX W ...
Страница 173: ...16 MEMO 173 KX FT907BX B KX FT907BX W ...
Страница 180: ...180 KX FT907BX B KX FT907BX W Y M KXFT907BXB KXFT907BXW ...