KV-S5055C (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 13

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1. Remove all packing tape.

2. Push the ADF Door Release (1) to open the ADF door (2).

3. Pull towards you and remove the Double-feed Prevention
    Roller Cover by using the indent (1).

4. Install the Double-feed Prevention Roller.

•  Align the shaft that is shaped as indicated by (1) with the

notch in the roller mount (2), and  then insert the shaft in the
notch. Push the shaft on the opposite side (3) until it clicks into
place.

After you install the Double-feed Prevention Roller, make sure
that the shaft is inserted into the tab, and that the shaft will not
rotate or move. If the roller is not installed correctly, it may
cause double feeding or a paper jam.