Epson WorkForce Pro WF-C8690 A3 Color MFP with PCL/PostScript - Manual (Page 417)

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• Check that the cable connecting your telephone wall jack to your product's LINE port is secure.
• Print a fax connection report using your product control panel or fax software to help diagnose the
problem.
• Verify that the telephone wall jack works by connecting a phone to it and testing it.
• If there is no dial tone and you connected the product to a PBX (Private Branch Exchange) phone line
or Terminal Adapter, change the Line Type setting to PBX . If you still cannot send a fax, turn off the
product's dial tone detection setting. (Turning off the dial tone setting may cause the product to drop
the first digit of a fax number.)
• Check the Line Type setting and set it to PBX . If your phone system requires an external access code
to reach an outside line, register the code to the product and add a # (hash) to the beginning of the
phone number when dialing.
• If you connected your product to a DSL phone line, you must connect a DSL filter to the phone jack to
enable faxing over the line. Contact your DSL provider for the necessary filter.
• If you are connected to a DSL phone line, connect the product directly to a telephone wall jack and
send a fax. If it works, the problem may be caused by the DSL filter. Contact your DSL provider.
• If your telephone line has static, turn off your product's error correction mode fax communication
setting and try faxing again.
• Try lowering your product's fax speed setting.
• Make sure the error correction mode (ECM) setting is turned on if you are trying to send or receive a
color fax.
• If your telephone line uses call waiting and you have trouble receiving faxes, turn off call waiting to
prevent disruption of incoming faxes.
• If you have subscribed to a call forwarding service, the product may not be able to receive faxes.
Contact your service provider for assistance.
• Check your inbox and delete faxes after reading or printing them. If the inbox is full, the product cannot
receive faxes.
• When sending faxes using the subaddress feature, ask the recipient if their fax machine can receive
faxes using this feature. Check that the subaddress and password are correct, and that they match
with the recipient subaddress and password. Check this when receiving faxes as well.
• When receiving faxes using the subaddress feature, make sure the fax rejection settings are not
rejecting the fax.
• If you cannot send faxes at a specified time, make sure the date and time are set correctly on the
product.