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Designjet T1200 Printhead replacement error

HP Recommended
Designjet T1200 PostScript

Hello.  We have an HP Designjet T1200 Postscript plotter.  We replaced the service station.  Now as the printer boots up it can't get past the notice to replace printheads.  We've replaced them all.  We removed air from the ink system using the ink tube priming tool, cleaned the printheads and the contact points within the cartridge compartment.  I can't update the firmware while the printhead error is unresolved.  Help!!!!  I don't know what else to do to get beyond the printhead startup.  THANKS

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