Ricoh Aficio SP4100N Hardware Manual page 33

7. Align the notch of the SDRAM module to the slot, and then push it down until it clicks.
8. Match the controller board to the top and bottom rail using the " " mark, and then slide it
into the printer slowly until it stops.
9. Push the handle of the controller board until it clicks.
Attaching Memory Unit Type C 128MB/256MB (SDRAM Module)
AUA024S
AUB207S
AUB208S
2
31