Printer Prints "?" Or Incorrect Data With Serial Interface; Print Speed Is Slow When Using Windows Printer Driver; Printer Doesn't Cut Roll Paper With The Autocutter - Epson TM-U330 Technical Reference Manual

4.4 Printer prints "?" or Incorrect Data With Serial Interface

If one of the following errors occurs during serial interface communication, the printer prints "?" or
ignores the data, depending on the setting of the memory switch Msw1-4.
❏ Parity error
❏ Framing error
❏ Overrun error

4.5 Print Speed is Slow When Using Windows Printer Driver

When the printer prints a Windows font using the EPSON Advanced Printer Driver, the print speed is
slow. To improve the print speed, use a printer font.

4.6 Printer doesn't cut roll paper with the autocutter

TM-U330D does not have an autocutter unit. If you use the model, you can't use the autocutter function.
Use the manual cutter.
TM-U330 Technical Reference Guide
Troubleshooting 4-5