These printers use the F9J78A cartridge:

HP DesignJet T-920 EPrinter

HP DesignJet T-920 POSTSCRIPT EPrinter

HP DesignJet T-930

HP DesignJet T-1500 EPrinter

HP DesignJet T-1500 POSTSCRIPT EPrinter

HP DesignJet T-1530

HP DesignJet T-2500 EMFP

HP DesignJet T-2500 POSTSCRIPT EMFP

HP DesignJet T-2530

HP DesignJet T-2530 PS