Data From Host Is Not Printed Normally - Epson TM950 - B/W Dot-matrix Printer Troubleshooting Manual

Part 7A (Serial Version)

Data from host is not printed normally.

Start
Set SW7 of DIP switch bank 1 to OFF.
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