Ricoh SP 8400DN Field Service Manual page 1953

Ricoh a3 size black and white laser printer.

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Punch Unit PU3050 (D717)

Paper position detection

When the horizontal registration correction sensor [A] of the punch unit detects the leading edge of the

paper from the MFP, the horizontal registration correction motor [B] is driven, and starts to move the

punch unit to the front.

After the horizontal registration correction sensor detects the paper rear edge (as viewed from the front

of the machine), the machine compares it with the paper size set in the MFP. The horizontal registration

correction motor is then driven to a predetermined position at the front, and stops the punch unit.

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