Troubleshooting From Fax Function Diagnosis - Epson WF-C5790 Service Manual

EPSON WF-C5790/WF-C5790a/WF-C5710/ET-8700/WF-C5210/WF-C5290/WF-C5290a

4.3.7.3 Troubleshooting from fax function diagnosis

By conducting fax function diagnosis for diagnosis of trouble, it is possible to
diagnose basic items of fax function, line connection.
When an error is displayed in the fax function diagnosis report, the following
the method are implemented.
Diagnosis result Judgment contents
Communication problem
An error was found in
between Main board and Fax
the printer.
board
When the modem on hook of
It is not properly
the equipment, the voltage of
connected to the
the LINE port was less than the
telephone line.
specified value.
When the modem on hook of
the equipment, the voltage of
the LINE port was the
specified value, but if it is set
The modular cable is
to the off hook, it becomes
connected to the EXT
less than the specified
port.
voltage value of the LINE
port (When multiple modems
are on hook, the EXT port is
disconnected.)
Troubleshooting
Measure
 As hardware defects are
considered, repair or product
exchange (initial failure) is carried
out.
 Confirm that the telephone line
jack and the LINE port of the
equipment are properly connected
with the modular cable.
→ The stuffing of the modular
cable is broken.
If contact failure or disconnection,
exchange cable.
 Measure the line voltage with a
multimeter. (DC 48V at normal
time)
 Connect the external telephone to
the telephone line jack without
going through the device and check
whether telephone reaction,
incoming call, and call can be
made normally.
→ If there is an abnormality in the
telephone line, ask the telephone
line contractor for confirmation.
 Make sure that the modular cable
from the telephone line jack is
connected to the LINE and the
module cable from the external
telephone (if connected) is
connected to the EXT.
→ If the external telephone is
connected to the telephone line in
reverse, correctly connect it again.
Fax Troubleshooting
Diagnosis result Judgment contents
The off-hook phone was
Line connection is
measured and it was below the
unstable.
specified value.
No dial tone is
Can not detect the dial tone.
detected.
Revision A
Measure
 When a splitter is connected, in
case of separation, connect the
telephone line and the device
directly and perform fax function
diagnosis again. if resolving, the
splitter trouble has occured.
 If it is connected to a terminal
adapter, check if it improves by
restarting the terminal adapter.
 If you hear sound and intermittent
sound by pressing the "on hook"
button, set the connection line to
"private branch exchange (PBX)"
and perform the diagnostic test
again.
 You hear a continuous tone sound
by pressing the "On Hook" button,
but set "Dial tone detection" to
"OFF" when the tone is small.
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