User's Manual

HP Designjet T Series — Service Manual 1-49
Ink Supplies Troubleshooting
The printer will start checking and preparing the printheads. The default
routine process, when all printheads are changed, takes 25 minutes. If the
printer finds problems in preparing the printheads, it will take longer, up to
55 minutes. For a single printhead insertion, the times vary between 15 and
35 minutes. After all printheads are checked and prepared, for the
printhead realignment.
Aligning Printheads
Precise alignment between printheads is essential for accurate colors,
smooth color transitions
, and sharp edges in graphical elements. Your
printer has an automatic printhead alignment process which runs whenever
a printhead has been accessed or replaced.
In cases where the paper has jammed, you have used a custom paper, or
are ex
periencing problems with color accuracy you may need to align the
printheads. If the paper has jammed, it is recommended that you reinsert the
printheads and initiate the realignment procedure with the Image Quality
Maintenance menu.
Do not use transparent and semi-transparent paper to align
the printheads. Photo paper is recommended for the best
quality.
Reinsert Printheads Procedure
1 If the realignment process is running and the w
rong paper is loaded, press
the cancel key on the front panel. Do not print if the realignment process has
been canceled. You can restart the alignment with the Image Quality
Maintenance menu procedure.
2 L
oad the paper you wish to use,. You can use a roll or cut sheet, however, it
must
be A3 landscape or larger.
3 Remove and re-insert all the printheads, see Remove a printhead and Insert
a pr
inthead. This will start the printhead alignment procedure.
4 Ensure the transparent window closed, as a strong light source near the
print
er during printhead realignment can affect alignment.
5 The process will take about six minutes. Wait u
ntil the front panel display
shows the process complete before using the printer.
Image Quality Maintenance Procedure
1 L
oad the paper you wish to use. You can use a roll or cut sheet, however, it
mu
st be A3 landscape or larger (420 by 297 mm). Do not use transparent
and semi-transparent paper to align the printheads. Photo paper is
recommended for the best results; plain, bond and thin coated papers
provide acceptable but marginal results.
2 Pr
ess the Menu key to return to the main menu and select the Image Quality
Maint
enance menu icon.
3 Select Align printheads. The printer will check to see if it has enough paper
to
run the realignment.
4 If the loaded paper is satisfactory, the print
er will run the realignment and
print a realignment pattern. Ensure the transparent window is closed, as a