These printers use the Q5942X cartridge:
Click On a Printer to View it's Cartridges
          HP LaserJet 4200
          HP LaserJet 4200 DTN
          HP LaserJet 4200 DTNS
          HP LaserJet 4200 DTNS1
          HP LaserJet 4200 DTNSL
          HP LaserJet 4200 N
          HP LaserJet 4200 Series
          HP LaserJet 4200 TN
          HP LaserJet 4250
          HP LaserJet 4250 DTN
          HP LaserJet 4250 DTNSL
          HP LaserJet 4250 N
          HP LaserJet 4250 TN
          HP LaserJet 4300
          HP LaserJet 4300 DTN
          HP LaserJet 4300 DTNS
          HP LaserJet 4300 DTNS1
          HP LaserJet 4300 DTNSL
          HP LaserJet 4300 N
          HP LaserJet 4300 Series
          HP LaserJet 4300 TN
          HP LaserJet 4345 MFP
          HP LaserJet 4345 X MFP
          HP LaserJet 4345 XM MFP
          HP LaserJet 4345 XS MFP
          HP LaserJet 4350
          HP LaserJet 4350 DTN
          HP LaserJet 4350 DTNSL
          HP LaserJet 4350 N
          HP LaserJet 4350 TN
          HP LaserJet M-4345 MFP
          HP LaserJet M-4345 X
          HP LaserJet M-4345 XM
          HP LaserJet M-4345 XS
          Kodak DIGITAL SCIENCE 1000 PS
          TROY-Systems Troy 4200
          TROY-Systems Troy 4200 EX
          TROY-Systems Troy 4250
          TROY-Systems Troy 4250 /T
          TROY-Systems Troy 4250 /T SECURE
          TROY-Systems Troy 4250 /TSECURE EX
          TROY-Systems Troy 4300
          TROY-Systems Troy 4300 SECURE
          TROY-Systems Troy 4300 SECURE EX
          TROY-Systems Troy 4350
          TROY-Systems Troy 4350 N/NT
          TROY-Systems Troy 4350 N/NTSECUEX
          TROY-Systems Troy 4350 N/NTSECURE