Removal and Installation 4. Remove 1 T-10 screw ( Type B ) from the back of the Electronics Module. 5. Loosen 1 T-10 screw ( Type B ) just below the Electronics Module. Loosen Only 6. Lift the Electronics Module up and towards the right and remove from Printer. 2 1 8-25 HP DesignJets 500 and 800 Series Printers Service Manual