HP DeskJet 550C (C2121A)
MFG Part Number: C2121A
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Service Guide parts for C2121A HP DeskJet 550C Printer
C2121A-Guide
Service Guide - Printer Reference Guide (not a service manual) - Contains information such as product information, operation overview, paper behavior, maintenance, ink safety, and removal / replacement of parts. This is not a service manual for technical repair.
DeskJet 550C Printer parts list