HP C7769B Service Manual - Page 116

Print Quality How to Use the Troubleshooting Procedure What is the Troubleshooting Procedure? The Printer contains an internal Troubleshooting procedure which helps you to diagnose and resolve the possible source of any Image Quality or Line Quality defects. If Print Quality is poor at anytime, the Troubleshooting procedure should be performed which will determine whether the Printhead needs replacing (by marking it with an exclamation mark) or not after performing various levels of recovery actions. Considerations for Using the Troubleshooting Procedure. 1 It is important that the media that you use for the Troubleshooting procedure is exactly the same as the one that the customer used when they experienced the print quality problem. If the customer used HP Glossy Paper size A0, then you must use HP Glossy Paper size A0. If you use a different type of media or a different size, then there is a possibility that the print quality problem will not be resolved. 2 If the customer is using non-HP media and after the Troubleshooting procedure you still have the same print quality problems, change to genuine HP media and repeat the Troubleshooting procedure. Using this process you can determine if the problem is with the Printer or with the non-HP media. 3 If you do not see any problems with the Troubleshooting procedure but still experience print quality problems, then the problem may not be with the Printer itself. The problem may be with the RIP or the driver for example. Performing the Troubleshooting Procedure 1 To perform the Troubleshooting procedure press the ↑ or ↓ key until the front panel displays the Ink Menu and then press Enter. Ink menu Ink cartridges Menu Back Enter 6-4 HP DesignJets 500 and 800 Series Printers Service Manual