98
KX-FC265GR-T
(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 fre-
quency. (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 dis-
tance 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 pre-
vent the collision of the signals at both
end.
Service code (774)
(T4 timer)
Summary of Contents for KX-FC265GR-T
Page 13: ...13 KX FC265GR T 4 2 1 2 Error Messages Report 4 2 2 Cordless Handset ...
Page 22: ...22 KX FC265GR T 6 4 2 Block Diagram ...
Page 24: ...24 KX FC265GR T ...
Page 61: ...61 KX FC265GR T Note Refer to Program Mode Table P 102 ...
Page 69: ...69 KX FC265GR T 11 2 Cordless Handset ...
Page 72: ...72 KX FC265GR T 11 3 2 Service Mode Settings Note The above values are the default values ...
Page 80: ...80 KX FC265GR T Countermeasure ...
Page 81: ...81 KX FC265GR T REFERENCE Test Mode P 62 ...
Page 82: ...82 KX FC265GR T REFERENCE Test Mode P 62 ...
Page 83: ...83 KX FC265GR T REFERENCE Test Mode P 62 ...
Page 84: ...84 KX FC265GR T REFERENCE Test Mode P 62 ...
Page 85: ...85 KX FC265GR T ...
Page 86: ...86 KX FC265GR T REFERENCE Test Mode P 62 ...
Page 87: ...87 KX FC265GR T REFERENCE Test Mode P 62 ...
Page 91: ...91 KX FC265GR T ...
Page 116: ...116 KX FC265GR T ...
Page 123: ...123 KX FC265GR T I O and Pin No Diagram ...
Page 126: ...126 KX FC265GR T 12 5 5 2 NG Example ...
Page 130: ...130 KX FC265GR T 12 5 7 2 Troubleshooting Flow Chart ...
Page 136: ...136 KX FC265GR T 12 5 11 Thermal Head Section Note Refer to Thermal Head P 23 ...
Page 145: ...145 KX FC265GR T 13 Service Fixture Tools ...
Page 150: ...150 KX FC265GR T 14 3 Disassembly Procedure 14 3 1 How to Remove the Image Sensor CIS ...
Page 151: ...151 KX FC265GR T 14 3 2 How to Remove the Thermal Head ...
Page 152: ...152 KX FC265GR T ...
Page 153: ...153 KX FC265GR T 14 3 3 How to Remove the Bottom Frame ...
Page 154: ...154 KX FC265GR T 14 3 4 How to Remove the P C Boards and Speaker ...
Page 155: ...155 KX FC265GR T 14 3 5 How to Remove the Power Supply Board and AC Cord ...
Page 156: ...156 KX FC265GR T 14 3 6 How to Remove the Gear Block and Separation Roller ...
Page 157: ...157 KX FC265GR T 14 3 7 How to Remove the Gears Motors and Arms of the Gear Block ...
Page 158: ...158 KX FC265GR T ...
Page 159: ...159 KX FC265GR T 14 3 8 How to Remove the Charger Board A ...
Page 160: ...160 KX FC265GR T 14 3 9 How to Remove the Back Cover ...
Page 161: ...161 KX FC265GR T 14 3 10 How to Remove the Platen Roller and Lock Lever ...
Page 162: ...162 KX FC265GR T ...
Page 163: ...163 KX FC265GR T 14 3 11 How to Remove the Pickup Roller and Antenna ...
Page 164: ...164 KX FC265GR T 14 3 12 How to Remove the Operation Panel ...
Page 165: ...165 KX FC265GR T 14 3 13 How to Remove the Operation Board MIC Board and LCD ...
Page 166: ...166 KX FC265GR T 14 3 14 How to Remove the Separation Holder and Exit Roller ...
Page 167: ...167 KX FC265GR T 14 3 15 Installation Position of the Lead Wires 14 3 15 1 Lower Section ...
Page 168: ...168 KX FC265GR T ...
Page 169: ...169 KX FC265GR T ...
Page 170: ...170 KX FC265GR T ...
Page 171: ...171 KX FC265GR T 14 3 15 2 Operation Panel Section ...
Page 172: ...172 KX FC265GR T 14 3 15 3 Back Cover Section ...
Page 173: ...173 KX FC265GR T 14 3 16 How to Remove the Cordless Handset Board ...
Page 174: ...174 KX FC265GR T 14 3 16 1 How to Replace the LCD ...
Page 203: ...203 KX FC265GR T 17 1 7 Cordless Handset Board ...
Page 208: ...208 KX FC265GR T 17 4 Test Chart 17 4 1 ITU T No 1 Test Chart ...
Page 209: ...209 KX FC265GR T 17 4 2 ITU T No 2 Test Chart ...
Page 210: ...210 KX FC265GR T 17 4 3 Test Chart ...
Page 211: ...211 KX FC265GR T Memo ...
Page 224: ...224 KX FC265GR T Memo ...
Page 243: ...243 KX FC265GR T Memo ...
Page 261: ...261 KX FC265GR T Memo ...
Page 271: ...271 KX FC265GR T ...
Page 272: ...272 KX FC265GR T K T KXFC265GRT ...