Lathem AT-DDC4 manual Time Formats, Front Panel, Back Side of Circuit Board

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Time Formats

The AT-DDC4 Series Wall Clocks can be set to display in 12 Hour or 24 Hour format. When in 12 Hour format, a red LED in the upper left corner of the display indicates PM hours. When in 24 Hour format, the hours are displays in Military style.

Front Panel

To set the display format, use the jumper (J1) located on the back of the circuit board which can be accessed by removing the right side end cap and sliding the circuit board out slightly.

Back Side of Circuit Board

Jumper J1

On = 12 Hour display

Off = 24 Hour display