Ricoh Aficio SP 4310N Hardware Manual page 64

3. Installing Options
7. Keeping the module at an angle, press it down until it clicks into place.
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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.
The printer may malfunction if the controller board is not properly installed.
9. Push the handle of the controller board until it clicks.
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CEC014
CEE059
CEE106