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HP 5Si:
- Press MENU key 4 times for CONFIG MENU
- Press ITEM to display SERVICE MESSAGE=OFF
- Press ENTER
- Press ONLINE
HP 4000/4050/4100/5000 Printers:
- Turn the printer off
- Hold down the left side of the ITEM and VALUE +/- keys, turn the printer on and wait until RESET MAINTENANCE COUNT is displayed and then release the keys
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