Genuine OEM HP Color LaserJet 5550dtn Toners

The Color LaserJet 5550dtn uses HP 645A cartridges for printing toner and separate Q3984A fuser and C9734B transfer kits for maintenance. The fuser bonds toner to paper with heat. Ordering fresh toner does not address a warning about that assembly or the transfer kit.

Toner Buzz carries genuine HP 645A singles and a four-color toner set for the 5550dtn, plus the separate maintenance kits. A single cartridge covers one needed color; the toner set includes black, cyan, magenta, and yellow together. Choose the fuser or transfer kit for its own maintenance job, not as part of the toner set.