Ricoh B230 Training Program page 199

The ARDF is a standard option
It feeds originals above the main copier's DF
exposure glass during scanning.
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The DF exposure glass is a narrow glass to the left side of
the exposure glass. The ADF does not use the main
exposure glass. The main glass is only used when the user
selects book mode, and puts the originals on the glass.
The inverter unit lets the user make copies of two-
sided originals. It stacks the originals in the
correct order after scanning.
Overview
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