CEYE For HP L7500 L7550 L7555 L7580 L7590 L7600 Print Head Printer Head Cleaner Cleaning Maintenance Repair Tool V3N print head cleaning repair tool For HP Print Head Maintenance Refilling Cleaning Kits The maintenance device is mainly for the problem of air-entering to the print head vertical and horizontal blank stripe printing It won't be helped for the problem of chip damage and electrical fualts of the print head Do not mix the color when pouring ink to the funnel to refill ink into the printer head.