HP DesignJet T790

What is the Service Image Quality Diagnostic Print?

The Printer contains an internal Image Quality Test which helps you to diagnose the possible source of any image quality defects. The Service IQ Diagnostic Print is available in the following options:

1. Image Quality Service Best Plot. This plot helps you to diagnose in more detail the possible source of any image quality defects. It is accessible
   a. Diagnostic Part 1: Printhead Reliability Test. The purpose of this test is to identify which Printhead is faulty
   b. Diagnostic Part 2: Printhead Alignment Test. This test is designed to check any color-to-color and bi-directional misalignment the printer may have.
   c. Diagnostic Part 3: Printheads and Paper Advance test. This test is designed to check whether the Printheads and the Media Advance Mechanism are working correctly.
2. Image Quality Service Normal Plot. This plot is the same as the Image Quality Service Best Plot but uses the Normal Print Mode.
3. Advanced Diagnostic Plot. These tests provide more information of the IQ defects that we could find in the Image Quality Service plot. For more information.

Considerations for Printing the Diagnostic Print

1. The IQ Diagnostic Print prints in A3 and B sizes so you must have media loaded (roll or sheet) that is this size or larger.
2. Use the same type of media that the customer was using when they found the image quality.
3. If the customer is using non-HP media and after the Image Quality Test you still have the same image quality problems, change to genuine HP media and repeat the Image Quality Test.
4. If you do not see any problems with the Image Quality Test, the problem may not be with the printer itself. The problem may be with the RIP or the driver.

If you do see problems with the Image Quality Test, continue with the Advanced Diagnostic procedures which will help you diagnose the problem.

Printing the Diagnostic Print

1. In the Service Utilities submenu, scroll to “Diagnostic Print” and press OK.
2. You will be given three options. Use the Arrow keys to make the selection and press the OK key to start printing the required Diagnostic Print or to enter the Advanced Diagnostics menu.
3. If you selected the Advanced Diagnostics Prints in the previous step, use the Arrow keys to make the required selection Paper Advance, Visual Alignment Diagnostic, Nozzle Health, Force Drop Detection or Print Banding Plot, and press the Enter key to start printing.
4. Make sure media is loaded, the Media Lever is lowered and that the Ink System is correctly installed. Press the OK key to print the Diagnostic Print or press Back/ Cancel to exit without printing the Diagnostic Print.
5. The selected Diagnostic Print will now be printed.