93
KX-FP701ME
(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-FP701ME
Page 9: ...9 KX FP701ME 4 General Introduction 4 1 Error Message 4 1 1 Display 4 1 2 Report ...
Page 11: ...11 KX FP701ME 6 Technical Descriptions 6 1 Connection Diagram ...
Page 13: ...13 KX FP701ME 6 2 1 General Block Diagram ...
Page 15: ...15 KX FP701ME 6 3 2 Memory Map ...
Page 24: ...24 KX FP701ME 6 4 2 Block Diagram ...
Page 26: ...26 KX FP701ME ...
Page 68: ...68 KX FP701ME 11 2 2 Service Mode Settings Note The above values are the default values ...
Page 75: ...75 KX FP701ME Countermeasure ...
Page 76: ...76 KX FP701ME REFERENCE Test Mode P 60 ...
Page 77: ...77 KX FP701ME REFERENCE Test Mode P 60 ...
Page 78: ...78 KX FP701ME REFERENCE Test Mode P 60 ...
Page 79: ...79 KX FP701ME REFERENCE Test Mode P 60 ...
Page 80: ...80 KX FP701ME ...
Page 81: ...81 KX FP701ME ...
Page 82: ...82 KX FP701ME REFERENCE Test Mode P 60 ...
Page 86: ...86 KX FP701ME ...
Page 111: ...111 KX FP701ME ...
Page 118: ...118 KX FP701ME I O and Pin No Diagram ...
Page 120: ...120 KX FP701ME Other NG example while the power is ON and the LCD displays the following ...
Page 121: ...121 KX FP701ME 12 5 5 2 NG Example ...
Page 125: ...125 KX FP701ME 12 5 7 2 Troubleshooting Flow Chart ...
Page 129: ...129 KX FP701ME 12 5 9 5 Check the HOOK Switch SW101 ...
Page 131: ...131 KX FP701ME 12 5 11 Thermal Head Section Note Refer to Thermal Head P 25 ...
Page 132: ...132 KX FP701ME 13 Service Fixture Tools ...
Page 136: ...136 KX FP701ME 14 2 2 HOW TO REMOVE THE OPERATION PANEL BLOCK ...
Page 137: ...137 KX FP701ME 14 2 3 HOW TO REMOVE THE OPERATION BOARD AND LCD ...
Page 138: ...138 KX FP701ME 14 2 4 HOW TO REMOVE THE SEPARATION HOLDER AND EXIT ROLLER ...
Page 139: ...139 KX FP701ME 14 2 5 HOW TO REMOVE THE IMAGE SENSOR CIS ...
Page 140: ...140 KX FP701ME 14 2 6 HOW TO REMOVE THE THERMAL HEAD ...
Page 141: ...141 KX FP701ME 14 2 7 HOW TO REMOVE THE PLATEN ROLLER AND BACK COVER ...
Page 142: ...142 KX FP701ME 14 2 8 HOW TO REMOVE THE PICKUP ROLLER ...
Page 143: ...143 KX FP701ME 14 2 9 HOW TO REMOVE THE CASSETTE LEVER ...
Page 144: ...144 KX FP701ME 14 2 10 HOW TO REMOVE THE BOTTOM FRAME ...
Page 145: ...145 KX FP701ME 14 2 11 HOW TO REMOVE THE DIGITAL ANALOG SENSOR BOARDS ...
Page 146: ...146 KX FP701ME 14 2 12 HOW TO REMOVE THE POWER SUPPLY BOARD AND AC CORD ...
Page 147: ...147 KX FP701ME 14 2 13 HOW TO REMOVE THE MOTOR BLOCK AND SEPARATION ROLLER ...
Page 148: ...148 KX FP701ME 14 2 14 HOW TO REMOVE THE GEARS OF MOTOR BLOCK ...
Page 149: ...149 KX FP701ME 14 2 15 INSTALLATION POSITION OF THE LEAD WIRES ...
Page 163: ...163 KX FP701ME 16 1 4 Power Supply Board 16 1 5 Interface Board ...
Page 166: ...166 KX FP701ME 16 3 Test Chart 16 3 1 ITU T No 1 Test chart ...
Page 167: ...167 KX FP701ME 16 3 2 ITU T No 2 Test Chart ...
Page 168: ...168 KX FP701ME 16 3 3 Test Chart ...
Page 169: ...169 KX FP701ME MEMO ...
Page 180: ...180 KX FP701ME MEMO ...
Page 188: ...188 KX FP701ME MEMO ...
Page 194: ...194 KX FP701ME 20 1 2 Operation Panel Section ...
Page 195: ...195 KX FP701ME 20 1 3 Back Cover Section ...
Page 196: ...196 KX FP701ME ...
Page 197: ...197 KX FP701ME 20 1 4 Upper Cabinet Section ...
Page 198: ...198 KX FP701ME 20 1 5 Lower Cabinet Section ...
Page 199: ...199 KX FP701ME 20 1 6 Gear Block Section ...
Page 200: ...200 KX FP701ME 20 1 7 Screws ...
Page 201: ...201 KX FP701ME 20 1 8 Accessories and Packing Materials ...