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...

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...

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...

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
●...

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...

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...

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...

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...

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...

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...