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17. Power cable connection
18. Duplex unit
19. Parallel interface connection
20. USB interface connection
21. LAN interface connection (only for B410dn, B420dn and B430dn)
22. Test button (only for B410dn, B420dn and B430dn)
23. Memory panel (to upgrade your printer’s memory RAM DIMM)
24. Cooling fan
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