Panasonic KX-FP85 Service Manual page 53

(Cause C)
This model is FAX1 and the other party is FAX2.
For transmission from this model to FAX2, FAX2 executes automatic reception and transmits a CED signal (2100 Hz) followed by
a DIS signal. As the echo cancelers stops as described in cause B, the echo of the DIS signal returns to FAX2. On the other hand,
this model detects the DIS signal and transmits a DCS signal. In other words, it is possible that the echo of the DIS signal and the
DCS signal transmitted from this model reach FAX2 one after the other. FAX2 detects an error and communication does not start.
(Countermeasure C)
When the international DIS detection setting is set in the service mode (code No.594), this model does not respond to the first DIS
signal and returns a DCS signal only for the second DIS signal.
In other words, there is an interval of 250 msec between transmission of the first and second DIS signal so that the echo cancelers
operation recovers. An echo is not generated for the second DIS signal.
Note:
When the other FAX does not respond with a DCS signal after DIS signal transmission, the DIS signal is transmitted three times
for trial.
Summary:
Symptom/Countermeasure Table (Long distance and international communication operations)
SYMPTOM
Does not receive in the automatic mode.
Does not transmit.
Does not receive.
2.3.5.1.6. 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 2.4.4 SERVICE FUNCTION TABLE(P.91).
COUNTERMEASURE
1. If possible, manual transmission should be done from the transmission side.
2. If possible, two pauses should be inserted at the end of the auto dial
number on the transmission side.
3. If possible, the Function Selector Switch should be switched to FAX.
1. Confirm the international line mode is ON. (Service mode: code No. 521)
2. Set the international DIS detection. (Service mode: code No. 594)
1. Set the time setting between the CED signal and the DIS signal to 500
msec. (Service mode: code No. 593)
2. Set the CED frequency to 1100Hz. (Service mode: code No. 520)
3. Reduce the RCV sensitivity. (Service mode: code No. 598)
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KX-FP85