Duplo DF-920 Maintenance Manual page 77

(31) Panel check mode (Code No.36)
Mode for checking the LEDs and 7-segment of the control panel.
Pressing the start key lights up the whole 7-segment, and pressing the stop key lights up all LEDs. (Some LEDs
may blink depending on the other settings of the maintenance mode.)
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12H-M12M0-0309-0