HP Designjet 4520ps 42 in User Manual

							26.Lower the roll 1 paper load lever.
27.Lower the roll 2 paper load lever.
28.Close the window.
29.Switch on the printer.
30.Reload the rolls. See 
Load a roll into the printer [4520] on page 33.
If you find that there is still some paper causing an obstruction within the printer, it can often be
cleared by loading a rigid paper type into the printer.
31.Re-engage the bin or stacker with the printer.
32.If you find that you have print quality problems after a paper jam, try realigning the printheads.
See 
Align the printheads on page 101.
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							Check paper path
●This problem can occur when a roll has finished and the end of the roll is stuck to the cardboard
core. If this has happened, cut the end of the roll away from the core; you should then be able to
feed the paper through the printer, and load a new roll.
●Otherwise, follow the procedure described above, under 
Check printhead path on page 134.
A paper jam in drawer 2 [4520]
NOTE:This topic applies to the HP Designjet 4520 Printer series only.
A paper jam in drawer 2 is indicated on the front panel by a Possible paper jam message with the error
code 84.2x:01.
If you press the Select key, the front panel will display an animation showing how to recover from the
paper jam. Alternatively, you can refer to this document (see below).
To clear the paper jam:
1.Switch off the printer at the front panel, then also switch off the power switch at the rear.
2.Disengage the bin or stacker from the printer.
3.Open the window.
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							4.Lift the drive pinch lever as far up as it will go.
5.Lift the roll 2 paper load lever.
6.Lift the lower drawer upwards a little, then pull it towards you as far as it will go.
7.Cut the paper.
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							8.Remove the roll.
9.Lift the upper drawer upwards a little, then pull it towards you as far as it will go.
10.Carefully remove the cut-off lower end of the paper.
11.Carefully remove any paper that you can lift up and out from the top of the printer.
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							12.Investigate the front of the roll module, behind the drawers.
13.Remove any paper that you see there.
14.Remove any paper trapped between the roll and the small plastic rollers.
15.Go behind the printer and find the three vertical slits at the rear of the roll module.
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							16.If you can see paper through the slits, try to remove it by pushing it upwards or downwards.
17.Return to the front of the printer, and push the upper drawer back into place.
18.Push the lower drawer back into place.
19.Lower the drive pinch lever.
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							20.Lower the roll 2 paper load lever.
21.Close the window.
22.Switch on the printer.
23.Reload the rolls. See 
Load a roll into the printer [4520] on page 33.
If you find that there is still some paper causing an obstruction within the printer, it can often be
cleared by loading a rigid paper type into the printer.
24.Re-engage the bin or stacker with the printer.
25.If you find that you have print quality problems after a paper jam, try realigning the printheads.
See 
Align the printheads on page 101.
Prints do not stack properly in the bin
●Prints at the bottom of the bin may be damaged by the weight of the prints above them. For this
reason, you are recommended to collect prints from the bin before it becomes full.
●Coated paper with high ink content may be crumpled when falling into the bin. In this case, you are
recommended to collect prints from the bin more frequently than usual.
The printer uses a lot of paper to align the printheads
In order to align the printheads accurately, the printer sometimes needs to feed through up to 3 m (≈10
ft) of paper before starting the printhead alignment process. This is normal behavior and you should not
try to interrupt or prevent it. See 
Align the printheads on page 101.
The paper moves while the printer is in standby mode
[4520]
NOTE:This topic applies to the HP Designjet 4520 Printer series only.
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							While the printer is in standby mode, it may briefly come to life and move the paper slightly from time to
time in order to maintain the paper in the best possible condition. This is done only with certain specific
paper types (film, glossy paper and heavyweight coated paper).
The printer unloads or trims the paper after a long period
of disuse [4520]
NOTE:This topic applies to the HP Designjet 4520 Printer series only.
The printer may automatically unload or trim a roll if it has not been used for several days, in order to
maintain the paper in the best possible condition. This is done only with certain specific paper types
(glossy and heavyweight coated paper).
The printer unloads the paper while switched off [4520]
NOTE:This topic applies to the HP Designjet 4520 Printer series only.
While the printer is switched off at the front panel, it may automatically unload a roll in order to maintain
the paper in the best possible condition. This is done only with certain specific paper types (glossy paper
and heavyweight coated paper).
The printer unloads the paper when switched on [4520]
NOTE:This topic applies to the HP Designjet 4520 Printer series only.
If the printer is switched off using the switch at the rear, or by disconnecting the power cable, or by a
power cut, whenever it is switched on again it may automatically unload a roll in order to maintain the
paper in the best possible condition. This is done only with certain specific paper types (glossy paper
and heavyweight coated paper).
CAUTION:If you want to turn off the printer, you are strongly recommended to use the Power button
on the front panel before using the switch at the rear or disconnecting the power cable.
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							15 The problem is... (print quality topics)
●General advice
●
Banding (horizontal lines across the image)
●
Lines are missing or thinner than expected
●
Solid bands or lines printed over the image
●
Graininess
●
The paper is not flat
●
The print smudges when touched
●
Ink marks on the paper
●
A defect near the start of a print
●
Lines are stepped
●
Lines are printed double or in wrong colors
●
Lines are discontinuous
●
Lines are blurred (ink bleeds from lines)
●
Lines are slightly warped
●
Color accuracy
●
PANTONE color accuracy
●
Color matching between different HP Designjets
●
Improving gray neutrality
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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 
Supported paper
types on page 200.
●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, highlight the 
 or  icon on the front panel.
●Bear in mind that roll paper will generally give better print quality than a single sheet of the same
kind of paper. When you are using single sheets of paper, we strongly recommend that you always
set the print quality to Best.
●Check that you are using the most appropriate print quality settings for your purposes (see 
Choose
print quality settings on page 57). You are most likely to see print quality problems if you have set
the print quality to Fast.
●To maintain the best print quality at the expense of speed, change the Printhead monitoring
setting to Intensive. See 
Manage printhead monitoring on page 97.
●Check that your environmental conditions (temperature, humidity) are suitable for high-quality
printing. See 
Environmental specifications on page 210.
Banding (horizontal lines across the image)
If your printed image suffers from added horizontal lines as shown (the color may vary):
1.Check that you are using appropriate print quality settings. See Choose print quality settings
on page 57.
2.If the problem persists, clean the printheads. See 
Recover (clean) the printheads on page 97.
3.Consider changing to a heavier paper type: we recommend HP Heavyweight Coated Paper or HP
Productivity Photo Gloss when printing dense colors.
4.If the problem persists, use the Image Diagnostics Print to find out more about it. See 
How do I...
(Image Diagnostics Print topics) on page 117.
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