HP DeskJet 550C (C2121A)
MFG Part Number: C2121A
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Printer Support Linksshow
Carriage PC Board parts for C2121A HP DeskJet 550C Printer
C2121A-Carriage_PC_BRD
Carriage PC Board - This pc board attaches on the carriage, it is usually a small pc board that has carrage cable attached to it.
DeskJet 550C Printer parts list