HP Designjet T620 610 mm User Manual

							The printer displays out of paper when paper is available
If the roll has become loose from its core, it will not feed correctly and the printer will not load the paper.
If possible, tighten the paper to its core or load a new roll.
Prints do not fall neatly into the basket
●Ensure the basket is correctly installed.
● Ensure the basket is open.
● Ensure the basket not full.
● Paper often tends to curl near the end of a roll, which can cause output problems. Load a new roll,
or remove prints manually as they are completed.
The sheet stays in the printer when the print has been
completed
The printer holds the paper to allow the print to dry after printing, see Change the drying time
on page 42. If the paper is only partially ejected after the drying time, gently pull the sheet out of the
printer. If the automatic cutter is disabled, use the  Form feed and cut key 
 on the front panel, see
Feed and cut the paper on page 42.
The paper is cut when the print has been completed
By default the printer cuts the paper after the drying time has been completed, see Change the drying
time on page 42. You can disable the cutter, see Turn the automatic cutter on and off on page 42.
The cutter does not cut well
By default the printer is set to automatically cut the paper after the drying time has been completed.
If the cutter is turned on but not cutting correctly, check that the cutter rail is clean and clear of any
obstacles.
If the cutter is turned off, the  Form feed and cut key 
 only advances the paper. Use this key to move
the print far enough out of the front of the printer, until it is convenient to manually cut with a straight
edge or scissors.
The roll is loose on the spindle
The roll may need to be replaced or reloaded. If your roll has a three-inch cardboard core, ensure the
core adaptors supplied with the printer have been installed, see 
Load a roll onto the 24-inch spindle
on page 24.
A strip stays on the output tray and generates jams
If a small piece of paper (200 mm or smaller) has been cut, such as before (if new roll) and after 
the Form feed and cut  ke
 y              has been pressed, the cut strip remains in the output
tray. Onl
y when the printer is not working, reach in the tray and remove the strip.
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							Recalibrate the paper advance
Accurate paper advance is important to image quality because it is part of controlling the proper
placement of dots on the paper. If the paper is not advanced the proper distance between printhead
passes, light or dark bands appear in the print and image grain may increase.
The printer is calibrated to advance correctly with all the papers appearing in the front panel. When you
select the type of loaded paper, the printer adjusts the rate at which to advance the paper while printing.
However, if you are not satisfied with the default calibration of your paper, you may need to recalibrate
the rate at which the paper advances. See 
Troubleshooting print-quality issues on page 121 for steps
to determine if paper advance calibration will solve your issue.
You can check the paper advance calibration status of the currently loaded paper at any time by pressing
the  View loaded paper  key 
 on the front panel. The status may be one of the following.
● DEFAULT: This status appears when loading any paper that has not been calibrated. HP papers
in the Front Panel have been optimized by default and unless you experience image quality
problems in your printed image such as banding or graininess it is not recommended to recalibrate
the paper advance.
● OK: This status indicates that the loaded paper has been calibrated before. However you may need
to repeat the calibration if you experience image quality problems such as banding or graininess
in your printed image.
NOTE:
Whenever you update the printer’s firmware, the paper advance calibration values are
reset to factory default, see 
Update the firmware on page 101.
CAUTION: Transparent papers and films must be calibrated using Image Quality Maintenance menu
icon 
, then  Paper advance calibration  > Adjust paper advance , from step four in the Recalibrating
the paper advance procedure.
Recalibrating the paper advance procedure
1. Press the  Menu key to return to the main menu and select the Image Quality Maintenance menu
icon 
, then  Paper advance calibration  > Calibrate paper advance . The printer automatically
recalibrates the paper advance and prints a paper advance calibration image.
2. Wait until the front panel displays the status screen and re-print your print.
NOTE: The recalibration procedure takes approximately three minutes. Do not worry about the
paper advance calibration image. The front-panel display shows any errors in the process.
If you are satisfied with your print continue using this calibration for your paper type. If you see
improvement in your print, continue with step three. If you are dissatisfied with the recalibration,
return to the default calibration, see 
Return to default calibration on page 120.
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							3.If you would like to fine-tune the calibration or are using a transparent paper, press the  Menu key
to return to the main menu and select the Image Quality Maintenance menu icon 
, then  Paper
advance calibration  > Adjust paper advance .
4. Select the percentage of change from -100% to 100%. To correct light banding, decrease the
percentage. To correct dark banding, increase the percentage.
5. Press the  OK key on the front panel, to save the value.
6. Wait until the front panel displays the status screen and re-print your print.
Return to default calibration
Returning to the default calibration sets all the corrections made by the paper advance calibration to
zero. To return to the default paper advance calibration value, you must reset the calibration.
1.Press the  Menu key to return to the main menu and select the Image Quality Maintenance menu
icon 
, then Paper advance calibration  > Reset paper advance.
2. Wait until the front panel displays the operation has completed successfully before pressing the
back key to return to the main menu.
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							13 Troubleshooting print-quality issues
●General advice
●
Print quality troubleshooting wizard
●
Horizontal lines across the image (banding)
●
Lines are too thick, too thin or missing
●
Lines appear stepped or jagged
●
Lines print double or in the wrong colors
●
Lines are discontinuous
●
Lines are blurred
●
Line lengths are inaccurate
●
The whole image is blurry or grainy
●
The paper is not flat
●
The print is scuffed or scratched
●
Ink marks on the paper
●
Black ink comes off when you touch the print
●
Edges of objects are stepped or not sharp
●
Edges of objects are darker than expected
●
Horizontal lines at the end of a cut sheet print
●
Vertical lines of different colors
●
White spots on the print
●
Colors are inaccurate
●
Colors are fading
●
The image is incomplete (clipped at the bottom)
●
The image is clipped
●
Some objects are missing from the printed image
●
A PDF file is clipped or objects are missing
●
The Image Diagnostics Print
●
If you still have a problem
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							General advice
When you have any print-quality problem:
●To achieve the best performance from your printer, use only genuine manufacturers supplies and
accessories, whose reliability and performance have been thoroughly tested to give trouble-free
performance and best-quality prints. For details of recommended papers, see 
Order paper
on page 106.
● Make sure that the paper type selected in the front panel is the same as the paper type loaded into
the printer. To check this, use the 
View loaded paper key 
 on the front panel. At the same time,
check that the paper type has been calibrated. Also make sure that the paper type selected in your
software is the same as the paper type loaded into the printer.
CAUTION: If you have the wrong paper type selected, you could experience poor print quality
and incorrect colors, and perhaps even damage to the printheads.
● Check that you are using the most appropriate print-quality settings for your purposes (see
Printing on page 45
). You are likely to see lower print quality if you have moved the print-quality
slider to the Speed end of the scale, or set the custom quality level to  Fast.
● Check that your environmental conditions (temperature, humidity) are in the recommended range.
See 
Environmental specifications on page 159
.
● Check that your ink cartridges and printheads have not passed their expiration dates: see 
Maintain
the ink cartridges on page 100.
Print quality troubleshooting wizard
The Print Quality Troubleshooting Wizard can help with the following problems:
●Horizontal lines across the image (banding)
● The whole image is blurry or grainy
● Lines are too thick, too thin or missing
● Colors are inaccurate
To start the wizard:
● From the HP Printer Utility under Windows: go to the 
Support tab, and select  Print quality
troubleshooting .
● From the HP Printer Utility for Mac OS:
 select Print quality troubleshooting in the Support
group.
● From the Embedded Web Server:
 select Troubleshooting , then select Print quality
troubleshooting .
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							Alternatively, or if you have other print quality problems, you can continue reading this chapter.
Horizontal lines across the image (banding)
If your printed image suffers from added horizontal lines as shown (the color may vary):
1.Check that the paper type you have loaded corresponds to the paper type selected in the front
panel and in your software. To check on the front panel, use the  View loaded paper key 
.
2. Check that you are using appropriate print-quality settings for your purposes (see 
Printing
on page 45). In some cases, you can overcome a print-quality problem merely by selecting a higher
print-quality level. For instance, if you have set the Print Quality slider to  Speed, try setting it to
Quality . If you change the print-quality settings, you may wish to reprint your job at this point in
case the problem has been solved.
3. Print the Image Diagnostics Print. See 
The Image Diagnostics Print on page 133.
4. If the printheads are working correctly, go to the front panel and press the  View loaded paper key
 to see the paper advance calibration status. If the status is DEFAULT, try performing paper
advance calibration: see 
Recalibrate the paper advance on page 119.
If the problem persists despite all the above actions, contact your customer service representative for
further support.
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							Lines are too thick, too thin or missing
1.Check that the paper type you have loaded corresponds to the paper type selected in the front
panel and in your software. To check on the front panel, use the  View loaded paper key 
.
2. Check that you are using appropriate print-quality settings for your purposes (see 
Printing
on page 45). Select the custom print-quality options in the driver dialog (Mac OS Print dialog), and
try turning on the  Maximum detail option (if available). You may wish to reprint your job at this
point in case the problem has been solved.
3. If the resolution of your image is greater than the printing resolution, you may notice a loss of line
quality. If you are using the PCL or HP-GL/2 driver for Windows, you can find the  Max. Application
Resolution  option in the driver dialogs  Advanced tab, under  Document Options  > Printer
Features . If you change this option, you may wish to reprint your job at this point in case the problem
has been solved.
4. If lines are too thin or missing, print the Image Diagnostics Print. See 
The Image Diagnostics
Print on page 133.
5. If the problem remains, go to the front panel and select the Ink menu icon 
, then  Printhead
information  to see the printhead alignment status. If the status is PENDING, you should align the
printheads. See 
Align the printheads on page 142 . After alignment, you may wish to reprint your
job in case the problem has been solved.
6. Go to the front panel and press the  View loaded paper key 
 to see the paper advance calibration
status. If the status is DEFAULT, you should perform paper advance calibration: see 
Recalibrate
the paper advance on page 119 .
If the problem persists despite all the above actions, contact your customer service representative for
further support.
Lines appear stepped or jagged
If lines in your image appear stepped or jagged when printed:
1. The problem may be inherent in the image. Try to improve the image with the application you are
using to edit it.
2. Check that you are using appropriate print-quality settings. See 
Printing on page 45.
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							3.Select the custom print-quality options in the driver dialog (Mac OS Print dialog), and turn on the
Maximum detail  option (if available).
4. If you are using the PCL or HP-GL/2 driver for Windows, you can change your image rendering
resolution to 300 ppi or 600 ppi depending on your printing needs. You can find the  Max.
Application Resolution  option in the driver dialogs  Advanced tab, under  Document Options
>  Printer Features .
Lines print double or in the wrong colors
This problem can have various visible symptoms:
●Colored lines are printed double, in different colors.
●
The borders of colored blocks are wrongly colored.
To correct this kind of problem:
1.
Reseat the printheads by removing them and then reinserting them. See 
Remove a printhead
on page 88 and Insert a printhead on page 91.
2. Align the printheads. See 
Align the printheads on page 142.
Lines are discontinuous
If your lines are broken in the following way:
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							1.Check that you are using appropriate print-quality settings. See Printing on page 45.
2. Reseat the printheads by removing them and then reinserting them. See 
Remove a printhead
on page 88 and Insert a printhead on page 91.
3. Align the printheads. See 
Align the printheads on page 142.
Lines are blurred
Humidity can cause ink to soak into the paper, making the lines blurred and fuzzy. Try the following:
1.Check that your environmental conditions (temperature, humidity) are suitable for high-quality
printing. See 
Environmental specifications on page 159.
2. Check that the paper type selected in the front panel is the same as the paper type you are using.
To check on the front panel, use the  View loaded paper key 
.
3. Try changing to a heavier paper type, such as HP Heavyweight Coated Paper or HP Super
Heavyweight Plus Matte Paper.
4. Select a paper type that is slightly thinner than the paper you have loaded; this will persuade the
printer to use less ink. Here are some example paper types in ascending order of thickness: Plain
Paper, Coated Paper, Heavyweight Coated Paper, Super Heavyweight Plus Matte Paper.
5. If you are using glossy paper, try changing to a different type of glossy paper.
6. Align the printheads. See 
Align the printheads on page 142.
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							Line lengths are inaccurate
If you have measured your printed lines and find that the lengths are not sufficiently accurate for your
purposes, you can try to improve line length accuracy in the following ways.
1.Print on HP Matte Film, for which your printers line length accuracy is specified. See 
Functional
specifications on page 158.
Polyester film is about ten times more dimensionally stable than paper. However, using film that is
thinner or thicker than HP Matte Film will reduce line length accuracy.
2. Set the Print Quality slider to  Quality.
3. Maintain the room at a steady temperature between 10 and 30°C (50 and 86°F).
4. Load the roll of film and let it rest for five minutes before printing.
5. If you are still not satisfied, try recalibrating the paper advance. See 
Recalibrate the paper
advance on page 119.
The whole image is blurry or grainy
1. Check that the paper type you have loaded corresponds to the paper type selected in the front
panel and in your software. To check on the front panel, use the  View loaded paper key 
.
2. Check that you are printing on the correct side of the paper.
3. Check that you are using appropriate print-quality settings (see 
Printing on page 45). In some
cases, you can overcome a print-quality problem merely by selecting a higher print-quality level.
For instance, if you have set the Print Quality slider to  Speed, try setting it to  Quality. If you change
the print-quality settings, you may wish to reprint your job at this point in case the problem has been
solved.
4. Go to the front panel and select the Ink menu icon 
, then Printhead information  to see the
printhead alignment status. If the status is PENDING, you should align the printheads. See 
Align
the printheads on page 142 . After alignment, you may wish to reprint your job in case the problem
has been solved.
5. Go to the front panel and press the  View loaded paper key 
 to see the paper advance calibration
status. If the status is DEFAULT, you should perform paper advance calibration: see 
Recalibrate
the paper advance on page 119.
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