HP Designjet T1120 HD User Manual

							If you have to use such files, try to ensure that the EPS, PDF or grayscale images are already in the
same color space that you intend to use later on in Adobe InDesign or QuarkXPress. For instance, if
your final goal is to print the job in a press that follows the SWOP standard, convert the image into SWOP
when you create it.
Colors are fading
If you print on instant-dry photo paper, your prints will fade rapidly. If you plan to display the prints for
more than two weeks, you should laminate them to achieve longer life.
Prints on swellable coated papers will fade much less rapidly. However, lamination will increase the life
of prints (depending on the type of lamination) with all paper types. For more information, consult your
laminate provider.
The image is incomplete (clipped at the bottom)
●Did you press Cancel before all the data were received by the printer? If so, you have ended the
data transmission and will have to print the page again.
●The I/O timeout setting may be too short. This setting determines how long the printer waits for
the computer to send more data, before deciding that the job is finished. From the front panel,
increase the I/O timeout setting to a longer period and then send the print again. From the
Connectivity menu 
, select Advanced > Select I/O timeout.
●There may be a communications problem between your computer and the printer. Check your USB
or network cable.
●Check to make sure that your software settings are correct for your current page size (for example,
long-axis prints).
●If you are using network software, make sure it has not timed out.
The image is clipped
Clipping normally indicates a discrepancy between the actual printable area on the loaded paper and
the printable area as understood by your software. You can often identify this kind of problem before
printing by previewing your print (see 
Preview a print on page 61).
●Check the actual printable area for the paper size you have loaded.
printable area = paper size – margins
●Check what your software understands to be the printable area (which it may call printing area
or imageable area). For example, some software applications assume standard printable areas
that are larger than those used in this printer.
●If you have defined a custom page size with very narrow margins, the printer may impose its own
minimal margins, clipping your image slightly. You may want to consider using a larger paper size,
or borderless printing (see 
Select margins options on page 58).
●If your image contains its own margins, you may be able to print it successfully by using the Clip
Contents by Margins option (see 
Select margins options on page 58).
●If you are trying to print a very long image on a roll, check that your software is capable of printing
an image of that size.
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							●You may have asked to rotate the page from portrait to landscape on a paper size that is not wide
enough.
●If necessary, reduce the size of the image or document in your software application, so it fits
between the margins.
There is another possible explanation for a clipped image. Some applications, such as Adobe
Photoshop, Adobe Illustrator and CorelDRAW, use an internal 16-bit coordinate system which means
that they cannot handle an image of more than 32,768 pixels. If you try to print an image larger than this
from these applications, the bottom of the image will be clipped. In this case, the only way to print the
whole image is to reduce the resolution so that the whole image requires fewer than 32,768 pixels. The
PCL and HP-GL/2 drivers for Windows include an option called 16-bit App. Compatibility, which can
be used to reduce the resolution of such images automatically. You can find this option in the
Advanced tab, under Document Options > Printer Features.
Some objects are missing from the printed image
Large quantities of data may be necessary to print a high-quality large-format print job, and in some
specific workflows there may be issues that can lead to some objects missing from the output. Here are
some recommendations for the use of the PCL or HP-GL/2 drivers for Windows in these cases.
●In the Advanced tab, select Document options, Printer features and set Send job as bitmap
to Enabled (HP-GL/2 driver only).
●In the Advanced tab, select Document options, Printer features and set 16-bit App.
Compatibility to Enabled.
●In the Advanced tab, select Document options, Printer features and set Max. Application
resolution to 300.
The above settings are mentioned for troubleshooting purposes and may adversely affect the final output
quality or the time necessary to generate the print job. Therefore, they should be restored to their default
values if they do not help to solve the problem.
If you are working under Mac OS or using a PostScript driver, the above settings are not available.
Instead, you could try reducing the resolution of bitmap images in your application software.
A PDF file is clipped or objects are missing
In older versions of Adobe Acrobat or Adobe Reader, large PDF files could be clipped or lose some
objects when printing with the HP-GL/2 driver at high resolution. In order to avoid such problems,
upgrade your Adobe Acrobat or Adobe Reader software to the latest version. From version 7 onwards,
these problems should be solved.
The Image Diagnostics Print
The Image Diagnostics Print consists of patterns designed to highlight printhead reliability problems. It
helps you to check the performance of the printheads that are currently installed in your printer, and
whether any printhead suffers from clogging or other problems.
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							To print the Image Diagnostics Print:
1.Use the same paper type that you were using when you detected a problem.
2.
Use the View loaded paper key 
 on the front panel to check that the selected paper type is the
same as the paper type loaded into the printer.
3.
At the printers front panel, select the Image Quality Maintenance menu icon 
, then Print
diagnostic image.
It takes about two minutes to print the Image Diagnostics Print.
The print is divided into two parts, both of which test printhead performance.
●Part 1 (top) consists of rectangles of pure colors, one for each printhead. This part represents the
print quality that you will get from each color.
●Part 2 (bottom) consists of small dashes, one for each nozzle on each printhead. This part
complements the first, and aims more specifically to detect how many faulty nozzles each printhead
has.
Please look carefully at the print. The names of the colors are shown above the rectangles and in the
center of the patterns of dashes.
First look at the upper part of the print (part 1). Each colored rectangle should be a uniform color without
any horizontal lines across it.
Then look at the bottom part of the print (part 2). For each individual colored pattern, check that most
of the dashes are present.
If you see horizontal lines in part 1 and also missing dashes in part 2 for the same color, the printhead
responsible needs cleaning. However, if the rectangles look solid, do not worry about just a few missing
dashes in part 2; these are acceptable because the printer can compensate for a few clogged nozzles.
Here is an example of a gray printhead in a good state:
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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 169). 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 169). 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 169.
5.If the problem still remains, replace any persistently faulty printheads (see 
Handling ink cartridges
and printheads on page 113), or contact HP Support (see Contact HP Support on page 186).
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							If you still have a problem
If you still experience print-quality problems after applying the advice in this chapter, here are some
further things that you can do:
●Try using a higher print-quality option. See 
Printing on page 55.
●Check the driver you are using to print with. If it is a non-HP driver, consult the driver vendor about
the problem. You could also try using the correct HP driver, if feasible. The latest HP drivers can
be downloaded from 
http://www.hp.com/go/T1120/drivers.
●If you are using a non-HP RIP, its settings may be incorrect. See the documentation that came with
the RIP.
●Check that your printers firmware is up to date. See 
Update the firmware on page 131.
●Check that you have the right settings in your software application.
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							16 Troubleshooting ink cartridge and
printhead issues
●Cannot insert an ink cartridge
●
Ink cartridge status messages
●
Cannot insert a printhead
●
The front-panel display recommends reseating or replacing a printhead
●
Clean the printheads
●
Clean the printhead drop detector
●
Align the printheads
●
Printhead status messages
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							Cannot insert an ink cartridge
1.Check that you have the correct type of cartridge (model number).
2.Check that the colored label on the cartridge is the same color as the label on the slot.
3.Check that the cartridge is correctly oriented, with the letter or letters marking the cartridge label
right-side up and readable.
CAUTION:Never clean inside the ink cartridge slots.
Ink cartridge status messages
These are the possible ink cartridge status messages:
●OK: the cartridge is working normally, with no known problems.
●Missing: there is no cartridge present, or it is not correctly connected to the printer.
●Low: the ink level is low.
●Very low: the ink level is very low.
●Empty: the cartridge is empty.
●Reseat: you are recommended to remove the cartridge and then reinsert it.
●Replace: you are recommended to replace the cartridge with a new cartridge.
●Altered: there is something unexpected about the cartridges status.
●Expired: it is past the cartridges expiration date.
Cannot insert a printhead
1.Check that you have the correct type of printhead (model number).
2.Check that you have removed the two orange protective caps from the printhead.
3.Check that the colored label on the printhead is the same color as the label on the slot.
4.Check that the printhead is correctly oriented (compare with the others).
5.Check that you have correctly closed and latched the printhead cover, see Insert a printhead
on page 121.
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							The front-panel display recommends reseating or
replacing a printhead
1.From the front panel, turn the power off then on.
2.Check the front-panel display message, if it shows the ready message, the printer is ready to print.
If the problem remains continue with the next step.
3.Remove the printhead, see 
Remove a printhead on page 118.
4.Clean the electrical connections on the backside of the printhead with a lint free cloth. You can
carefully use a mild rubbing alcohol if moisture is needed to remove residue. Do not use water.
CAUTION:This is a delicate process and may damage the printhead. Do not touch the nozzles
on the bottom side of the printhead, especially not with any alcohol.
5.Reinsert the printhead, see Insert a printhead on page 121.
6.Check the front-panel display message. If the problem remains, try a new printhead.
Clean the printheads
As long as the printer is kept turned on, an automatic cleaning is performed periodically. This ensures
there is fresh ink in the nozzles and prevents nozzle clogs, which ensures color accuracy. If you have
not already done so, please see 
The Image Diagnostics Print on page 163 before proceeding.
To clean the printheads, press the Menu key to return to the main menu and select the Image Quality
Maintenance menu icon 
, then Clean printheads. If you have gone through the Image Quality
Diagnostic print process, you know which colors are failing. Select the pair of printheads which contain
the failing colors. If you are not sure which colors to clean, you can also select to clean all printheads.
Cleaning all printheads takes about nine minutes. Cleaning a single pair of printheads takes about six
minutes.
NOTE:Cleaning all printheads uses more ink than cleaning a single pair.
Clean the printhead drop detector
The printhead drop detector is a sensor that detects which nozzles on the printheads are not printing in
order to substitute them for good printing nozzles. If particles, such as fibers, hair or paper pieces, block
the sensor print-quality is affected.
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							When the front panel displays a warning message that the clean process is needed, you are
recommended to clean the printhead drop detector. If you do not clean the printhead drop detector
immediately, the printer continues working normally, however, the front panel display continues to show
the warning.
CAUTION:Wear gloves to avoid getting ink on your hands.
1.Turn off the printer at the front panel.
2.To avoid an electric shock, switch the printer off and unplug it.
3.Open the window.
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							4.Find the printhead drop detector beside the stored printhead carriage.
5.Remove any debris blocking the printhead drop detector.
6.With a dry lint free cloth, wipe the surface of the drop detector to remove any non-visible debris.
7.Close the window.
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