Canon NP6251 Service Manual page 500

3) If the user will be using a Card Reader-A1, connect the Card Reader-A1 relay cable
directly to the connector on the copier's DC controller PCB.
(At this time, disconnect the relay postheader from the relay cable.)
4) Fix the Copy Data Controller-A1 to the copier's rear cover with four screws.
COPYRIGHT © 1997 CANON INC.
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Screws
Fig. 9-509
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 9 INSTALLATION
Screws
9-45