Using Quiet Mode - Epson LQ-670 User Manual

Using Quiet Mode

In quiet mode, the printer makes less noise when it prints.
However, printing in quiet mode reduces the printing speed.
To turn on quiet mode, hold down the Font and Condensed
buttons and press the Operate button to turn on the printer.
To turn off quiet mode, press the Operate button to turn off
the printer.
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Using the Control Panel