Ricoh SP C400DN User Manual page 48

Installing Options
I
To install other options on the controller board, follow the appropriate in-
stallation procedure(s), and then screw down the controller board cover.
J
Fasten the four screws to attach the cover.
2
K
Align the controller board with the left and right rails, and then push it
carefully in, until it stops.
The printer may malfunction if the controller board is not properly installed.
L
Fasten the controller board to the printer using the three screws.
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AQC700S
AQC710S
AQC720S