Ricoh D124-17 Service Manual page 333

Roll Units
2. Remove the screws ( x4).
3. On the other side, remove screws [A] and disconnect the gear [B] ( x1, x1).
4. Turn the gear until you see the alignment mark [A] perfectly horizontal.
5. Slowly, pull gear [B]. You will see alignment pin [C]. If it falls out, retrieve it immediately.
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