User's Manual

HP Designjet T Series — Service Manual 1-12
Print quality troubleshooting
Below, the stepped lines highlighted in yellow are broken. When the line is
completely broken, this means the nozzle is out.
Below, the stepped lines highlighted in yellow are misdirected. When the
line is misdirected, this means the nozzle is malfunctioning or out of
position.
On the left of each Printhead Nozzle test, there is a series of horizontal
str
aight lines. If one or more nozzles are misdirected there will be unequal
spaces between the corresponding lines.
Corrective Action
If the printer has nozzle defects, you can still get
perfect print quality results.
The printer can automatically compensate for nozzle defects, so there is no
need to replace the Printhead.
The method of improving Nozzle Defects is to:
1 Recover the Printheads, using the Front Panel Main Menu/Image Quality
Maint
enance/Clean Printheads option.
2 Reprint the Printhead Nozzles Test Plot to verify that the defective nozzles
hav
e been corrected.
3 If the problem continues, replace the defective Printhead.
Dia
gnostic Part 2: Printhead Alignment
This test is designed to check any color-to-color and bi-directional
misalignmen
t the printer may have.