HP DeskJet 640U (C6508A)
MFG Part Number: C6508A
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Printer Support Linksshow
AC Adapter parts for C6508A HP DeskJet 640U Printer
C6508A-AC_Adapter
AC Adapter - Power supply module or adapter - one end for connecting to the printer and other end to the power cord, or your ac adapter may have the pwr cord attached.
DeskJet 640U Printer parts list