HP Designjet T790 HP Designjet T790 and T1300 ePrinter: User's Guide - English - Page 177

Corrective action, The Image Diagnostics Print

Page 177 highlights

Print-quality issues And here is an example of the same printhead in a bad state: Corrective action 1. Clean any faulty printheads (see Clean the printheads on page 173). Then reprint the Image Diagnostics Print to see whether the problem has been solved. 2. If the problem remains, clean the printheads again, and reprint the Image Diagnostics Print to see whether the problem has been solved. 3. If the problem remains, consider cleaning your printheads manually (see Clean the printheads on page 173). You could also try reprinting your current print job, in case it now prints satisfactorily. 4. If the problem remains, try cleaning the printhead drop detector. The printer normally notifies you when this is necessary, but it may be worth trying even if the printer has not suggested it. See Clean the printhead drop detector on page 173. 5. If the problem still remains, replace any persistently faulty printheads (see Handling ink cartridges and printheads on page 114), or contact HP Support (see Contact HP Support on page 192). ENWW The Image Diagnostics Print 169

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And here is an example of the same printhead in a bad state:
Corrective action
1.
Clean any faulty printheads (see
Clean the printheads
on page
173
). Then reprint the Image
Diagnostics Print to see whether the problem has been solved.
2.
If the problem remains, clean the printheads again, and reprint the Image Diagnostics Print to see
whether the problem has been solved.
3.
If the problem remains, consider cleaning your printheads manually (see
Clean the printheads
on page
173
). You could also try reprinting your current print job, in case it now prints
satisfactorily.
4.
If the problem remains, try cleaning the printhead drop detector. The printer normally notifies you
when this is necessary, but it may be worth trying even if the printer has not suggested it. See
Clean the printhead drop detector
on page
173
.
5.
If the problem still remains, replace any persistently faulty printheads (see
Handling ink cartridges
and printheads
on page
114
), or contact HP Support (see
Contact HP Support
on page
192
).
ENWW
The Image Diagnostics Print
169
Print-quality issues