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