Seiko TM-U590/U590P - Manual (Page 20)

1-8 Setting Up the Printer
2. Connect the ground wire to the printer using the FG screw on
the bottom of the printer, as shown.
Connecting the Power Supply
Use the optional EPSON PS-170 or equivalent power supply for
your printer.
WARNING:
Make sure that you use the EPSON PS-170 power supply or
equivalent. Using an incorrect power supply may cause fire or
electrical shock.