Sindoh M403 - Manual (Page 65)

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Preparation for Using the Device
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17. Paper
Automatic Feeding
When the currently-selected tray becomes empty, the device switches automatically to another tray
with paper of the same size and type.
Feeding Order
When automatic feeding is on, trays are switched in the below order:
Tray 1 → Tray 2 (Option) → Manual Tray