Epson U675 - TM Color Dot-matrix Printer Troubleshooting Manual page 11

Part 7B (Parallel Version)
Data from host is not printed normally.
Start
Send data from host to printer.
Is "?" printed?
No
Does interface
cable match
specifications?
Yes
Is the interface
cable damaged or
broken?
No
Return unit to PC-PoS.
Beyond Local Repair.
Yes
Are RS-232 interface
parameters set to
identical values at host
No
Replace with a proper
No
Yes
Replace interface
No
printer?
Yes
cable
Yes
OK?
END
cable.
Yes
OK?
END
No
Make settings identical
No
OK?
Yes
END