HP Designjet 2800/3800cp Service Manual - Page 317

Cleaning the Electrical Contacts? The problem. The printer fires drops by sending electrical signals from the printhead carriage to the printhead through the electrical contacts present on the carriage and on the printheads. The problem is that when you load the printheads into their stalls, sometimes some ink goes over the carriage electrical contacts, and when the printhead is installed over the printhead electrical contacts. When the printer prints, some ink goes to the bottom of the electrical contacts. This causes electrical continuity problems that can be fixed very easily. The solution. A new tool has been created especially to clean the electrical contacts and is called the Ink Cleaner (Part Number C6247A - includes the instructions). Scheduled Maintenance In some segments of the printer market, the customer tends to print more than the maximum number of prints that the throughput allows, exceeding by far the limit of the design. When this happens the customer runs into print quality problems and continuous Printer failures. The purpose of scheduled preventive maintenance is to avoid these failures ensuring a good performance during all the product life. Level of Printer Usage Normal printer use means an average of 15 image prints with an area of 0.76 m2/print (8 ft.2/print) per day. If the prints are smaller than this, the number of pages per day can be higher. Under normal usage conditions, it will be approximately 5 years before the printer needs maintenance. If the printer is used more than the normal usage conditions, then it will need maintenance service much more frequently. One of the EEROM counters is assigned to counting the number of swaths. When the printer exceeds 7,000,000 passes (HP DesignJets 2500CP/2000CP) or 6,000,000 passes (HP DesignJets 3500CP/300CP), the front panel displays the following message: "Maintenance Advised" The Service Print also conveys the usage information, and it is accessible by the user. Preventive Maintenance HP DesignJet CP Series printers 9-5