Epson FX-870 User Manual page 125

Options
When you use two tractor units in combination, continuous paper
does not feed properly.
The paper feed is crooked or paper jams.
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Make sure that the sprocket units on both tractors are aligned.
When you use an optional interface, the printer does not operate
properly.
The printer does not print or
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You may be trying to use an interface or interface cable with the
wrong specifications. Check the specifications to make sure you
can use the interface with this printer.
The computer and printer interface settings may not match.
Make sure the settings on the computer and printer match.
6-12 Troubleshooting
printout is not
the what you expect.