Data From Host Is Not Printed Normally - Epson TM U200D - B/W Dot-matrix Printer Technical Manual

5 Data from host is not printed normally.

Set DIP switch 1–1 to OFF.
Send data from host to computer.
(*)
Is "?" printed?
Does
interface
cable match
specifications?
interface PCB
connected to the
main PCB
firmly?
Replace interface PCB.
Replace printer
mechanism assembly
4-8 Troubleshooting
5 5
Yes
No
No
Replace with a proper cable.
Yes
Is
No
Yes
Yes
OK?
No
End
End
Are serial
interface parameters
set to identical values at
host printer?
Yes
No
OK?
Yes
End
Connect the interface
PCB firmly.
No
OK?
Yes
End
No
Make settings identical.
No
OK?
Yes
End
(*) Dotted line indicates
the process of checking
problems for the serial
interface.
Rev.B