Ricoh M281 Series Service Manual page 367

5. Remove the main board [A]. (hook×3)
4.26.4 DRIVE UNIT
1. Uninstall the optional paper feed unit from the main machine.
2. If the optional paper feed unit is installed on the caster table, uninstall it from the caster
table.
3. Remove the paper feed tray [A] of the optional paper feed unit by pulling it out.
SM
Paper Feed Unit (Paper Feed Unit PB1100)
4-173 D255/D256/M281/M282