Panasonic KX-F680BX, Service Manual

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TROUBLESHOOTING GUIDE
KX-F680BX/KX-F2681BX
Perform communication test us-
ing the LOOP simulator.
FTT is received after transmission of 2400BPS
training signal.
Is "Fall back" executed from
9600BPS?
Modem test
(TEST CODE NO.554)
Is communication OK?
Ask the receiver to perform FAX
communication from the re-
ceiver to the caller.
If this error frequently occurs at
the receiver, perform transmis-
sion in the above-mentioned
mode on the receiver.
Is communication OK?
Perform voice communication
with the receiver.
End
Check if the line is not inter-
rupted by noises or in the cross
talk. If it is not, wait until the line
is satisfactory for correct com-
munication.
(1) Raise the level of transmission. (Do not
raise the level above the standard of each
country. If the communication should be
OK at the level beyond the standard, it is
attributable to line condition or the
receiver's machine sensitivity condition.)
If no effect is obtained.
(2) Slow down the transmission start speed
and taransmit to the receiver again.
YES
YES
YES
NO
NO
NO
3.1
3.2
3