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hp designjet 90/120 and 130 series printers
» system maintenance tool (120/120nr)
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Clean Printheads
Clean printheads helps maintain proper operation of all nozzles in the printheads. This is only recommended if you are experiencing problems with print quality such as banding.
Three levels of cleaning are available: soft, medium and hard. As a first step, the soft cleaning should be used. If you still experience the same image problems, then select medium. Hard cleaning should only be used as a last resort.
Do not power off the printer during this operation. The printer display will indicate busy until the operation is finished.
Before cleaning the printheads, first check the maximum recovery level already performed on the printheads. If hard level (Recovery Level 3) has already been performed, then do not try performing hard level again. The Maximum Recovery Level can be seen on the Printer Information page in the "Printhead History" section.

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