Acroprint ATR120 - Manual (Page 26)

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For any other Error Codes contact your dealer or Acroprint Time Recorder.
To return to the original Factory settings, press the reset switch, located on the back
of the clock next to the PRO switch. When resetting the clock make sure the
PRO/NOR is in the NOR position. After resetting enter the PRO mode to reprogram
the clock.