Panasonic KX-FP88RS-B Service Manual ▷ View online
(Cause and Countermeasure)
As shown in the chart above, the total handshaking time must be reduced, but because of the long distance connection and
linking of several stations, the line connection time cannot be reduced. Accordingly, the following countermeasures should be
tried.
linking of several stations, the line connection time cannot be reduced. Accordingly, the following countermeasures should be
tried.
(A)... As the 35 sec. count is started directly after dialing or directly after the START button has been pressed for models with
a START button, the other party should be called manually, if possible. Another possibility is entering two pauses at the end of
the auto dial number on the transmission side. Then the count start time can be delayed for 2 pauses (about 10 sec.).
a START button, the other party should be called manually, if possible. Another possibility is entering two pauses at the end of
the auto dial number on the transmission side. Then the count start time can be delayed for 2 pauses (about 10 sec.).
Cause 2:
Erroneous detection because of an echo or an echo canceler.
(Echo/Echo Canceler)
The signal from FAX1 reaches FAX2 via stations 1 and 2, but the reflection signal at station 2 also returns via station 1 (echo).
As the distance between station 1 and station 2 is far, the echo returns to FAX 1 at a max of 600 msec after transmission. There
is a possibility that this signal is detected erroneously as the signal from FAX2. For a normal call, there is also a possibility that
the echo of their own voice will make the call difficult to understand. For this reason, each station (station 1 and station 2)
attaches echo cancelers (S1 and S2) for international lines or long distance lines. For the echo canceler, the level of the
transmission signal from FAX 1 is compared with the level of the reception signal from FAX2. When the transmission signal is
larger, S1 is closed while S2 is opened when it is smaller. In other words, for transmission from FAX1, S1 is closed and S2 is
open, so that the echo does not return to FAX1.
As the distance between station 1 and station 2 is far, the echo returns to FAX 1 at a max of 600 msec after transmission. There
is a possibility that this signal is detected erroneously as the signal from FAX2. For a normal call, there is also a possibility that
the echo of their own voice will make the call difficult to understand. For this reason, each station (station 1 and station 2)
attaches echo cancelers (S1 and S2) for international lines or long distance lines. For the echo canceler, the level of the
transmission signal from FAX 1 is compared with the level of the reception signal from FAX2. When the transmission signal is
larger, S1 is closed while S2 is opened when it is smaller. In other words, for transmission from FAX1, S1 is closed and S2 is
open, so that the echo does not return to FAX1.
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KX-FP88RS-B
(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.
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.
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)
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)
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)
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)
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.
distance communication on the telephone
line without an echo canceler.
or
There
are
some
cases
(e.g.
Mobile
comms.) which cause the collision of TX /
RX signals due to the delay / echo and
noise of the network / terminal. (Refer to
Fig. e)
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.
10 dBm to -15 dBm and the echo level
will decrease.
Service code (596)
(Transmit level set)
4
Sending side
Receiving side
Receiving side
Decrease the receiving sensitivity from
-13 dBm to about -32 dBm so an echo
signal will not received.
-13 dBm to about -32 dBm so an echo
signal will not received.
Service code (598)
(Receiving sensitivity)
5
Sending side
Receiving 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.
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)
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KX-FP88RS-B
Fig. c (Countermeasure by Changing the Interval Between
CED and DIS)
Fig. d (C3ountemeasure by Ignoring the 1st DIS)
<TX side signal>
<RX side signal>
<Countermeasure>
2nd / 3rd DCS / Training
& delayed CFR / FTT
at TX side
2nd / 3rd EOP / EOM / MPS
& delayed MCF / PIP / PIN / RTP / RTN
at TX side
delayed DCS
& 2nd / 3rd / --- DIS
at RX side
(Fig. e)
3.3.5.1.6. THE UNIT CAN COPY, BUT THE TRANSMISSION AND RECEPTION IMAGE ARE
INCORRECT
(Long distance or international communication operation)
This symptom highly depends on the transmission and reception capability of the other FAX unit and the line conditions.
The countermeasures for this unit are shown below.
Transmission Operation:
Set the transmitting speed to 4800BPS (service mode: code No. 717) or select the overseas mode.
Reception Operation:
If 80% or more of the reception is incorrect, set the receiving speed to 4800BPS. (Service mode: code No. 718)
•
•
Refer to SERVICE FUNCTION TABLE(P.88).
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KX-FP88RS-B
3.3.5.1.7. HOW TO OUTPUT THE JOURNAL REPORT
1. Press the MENU button two times.
2. Rotate
until the “ JOURNAL REPORT ” is displayed.
3. Press
button.
4. The report prints out.
Error code table:
(1) CODE
(2) RESULT
(3) MODE
SYMPTOM
Counter-
measure*
measure*
PRESSED THE STOP KEY
SND & RCV Communication was interrupted by the STOP button.
DOCUMENT JAMMED
SND
The document paper is jammed.
NO DOCUMENT
SND
No document paper.
THE COVER WAS OPENED SND & RCV The cover is open.
40
NO RESPONSE
SND
Transmission is finished when the T1 TIMER expires.
1
41
COMMUNICATION ERROR
SND
DCN is received after DCS transmission.
2
42
COMMUNICATION ERROR
SND
FTT is received after transmission of a 2400BPS training signal.
3
43
COMMUNICATION ERROR
SND
No response after post message is transmitted three times.
4
44
COMMUNICATION ERROR
SND
RTN and PIN are received.
5
46
COMMUNICATION ERROR
RCV
No response after FTT is transmitted.
6
48
COMMUNICATION ERROR
RCV
No post message.
7
49
COMMUNICATION ERROR
RCV
RTN is transmitted.
8
50
COMMUNICATION ERROR
RCV
PIN is transmitted (to PRI-Q).
8
51
COMMUNICATION ERROR
RCV
PIN is transmitted.
8
52
NO RESPONSE
RCV
Reception is finished when the T1 TIMER expires.
9
54
ERROR-NOT YOUR UNIT
RCV
DCN is received after DIS transmission.
11
58
COMMUNICATION ERROR
RCV
DCN is received after FTT transmission.
13
59
ERROR-NOT YOUR UNIT
SND
DCN responds to the post message.
14
64
COMMUNICATION ERROR
SND
Polling is not possible.
15
65
COMMUNICATION ERROR
SND
DCN is received before DIS reception.
2
65
COMMUNICATION ERROR
RCV
Reception is not EOP, EOM PIP, PIN, RTP or RTN.
2
68
COMMUNICATION ERROR
RCV
No response at the other party after MCF or CFR is transmitted.
13
70
ERROR-NOT YOUR UNIT
RCV
DCN is received after CFR transmission.
13
72
COMMUNICATION ERROR
RCV
Carrier is cut when the image signal is received.
16
75
MEMORY FULL
RCV
The document was not received due to memory full.
79
CANCELED
SND
The multi-station transmission was rejected by the user.
FF
COMMUNICATION ERROR
SND & RCV Modem error. For the DCN, DCN, etc. abbreviations, refer to
MODEM SECTION (P.152).
12
SND=TRANSMISSION RCV=RECEPTION
Most fax communication problems can be resolved by the following steps.
1. Change the transmit level. (Service code: 596, refer to SERVICE FUNCTION TABLE(P.88).)
2. Change the TX speed/RX speed. (Service code: 717/718, refer to SERVICE FUNCTION TABLE (P.88).)
Note*:
If the problem remains, see the following "Countermeasure" flow chart.
52
KX-FP88RS-B
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