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HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 22

Color profiles, Dynamic color registration, The problem: color misregistration

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Printer calibration The Closed-Loop Color Calibration and Ink Restriction Test Chart contains printed ink ramps in 2% steps, which can be useful as a visual guide for selecting the ink restriction percentages. To print the Closed-Loop Color Calibration and Ink Restriction Test Chart, select Substrate > Edit > Color > Print plot. Color profiles Color calibration provides consistent colors, but consistent colors are not necessarily accurate. For instance, if your printer prints all colors as black, its colors may be consistent but they are not accurate. In order to print accurate colors, it is necessary to convert the color values in your files to the color values that will produce the correct colors from your printer, your inks and your substrate. An ICC color profile is a description of a printer, ink and substrate combination that contains all the information needed for these color conversions. These color conversions are performed by your Raster Image Processor (RIP), not by the printer. For further information on the use of ICC profiles, see the documentation for your application software and for your RIP. Dynamic color registration If your substrate expands or shrinks due to the heat applied in the printing process, you may notice some color misregistration in your prints. You can reduce this problem using dynamic color registration, as follows: 1. Print a test pattern from the HP Internal Print Server. 2. Select settings to correct the error in the HP Internal Print Server. Consider performing dynamic color registration in the following cases: ● When you notice color misregistration in your prints ● When you use a substrate type for the first time ● When printing double-sided ● After replacing a printhead and aligning the printheads The problem: color misregistration Color misregistration means that colors are horizontally misaligned, in the direction of the carriage, towards the center of the substrate. The misregistration is different on each side of the roll, and cannot be corrected by printhead alignment. The examples shown here are magenta and black, because they are the most visible, but misregistration can also occur with the other color pairs: magenta and cyan, yellow and black, yellow and cyan. 16 Chapter 3 Printer calibration ENWW

Section	Page
Safety precautions	7
General safety guidelines	7
Electrical shock hazard	7
Heat hazard	8
Fire hazard	8
Mechanical hazard	9
Heavy substrate hazard	9
Ink handling	9
Warnings and cautions	10
Warning labels	10
Emergency stop buttons	11
Printer status	13
Check printer status	13
Printer alerts	13
Printer calibration	15
Align the printheads	15
Troubleshoot printhead alignment	16
Printhead alignment diagnostic plot	16
Substrate-advance compensation	17
Substrate-advance test print	17
Color calibration	18
Ink restrictions	21
Color profiles	22
Dynamic color registration	22
The problem: color misregistration	22
The solution: dynamic color registration	23
Dynamic color registration without the test pattern	25
Dynamic color registration on the fly	25
Which calibrations are specific to a certain substrate preset or printmode	28
Hardware maintenance	29
Maintain the ink cartridges	29
Maintain the printheads	29
Maintain the substrates	29
Check the printheads	30
Clean the carriage cover	31
Clean the carriage rails	31
Clean the curing plates	34
Clean the diverter rollers	34
Clean the exterior of the printer	35
Clean the ink deposits	35
Clean the line sensor and aerosol inlets	36
Clean the main roller	37
Clean the pinch wheels	38
Clean the platen	38
Clean the printheads	39
Clean the substrate-advance sensor	39
Clean the substrate edge holders	40
Clean the temperature sensors	40
Clean the tension roller (LX850 only)	41
Maintain the printhead primers	41
Replace the carriage oiler foams	43
Replace the ink collector foams (LX850 only)	44
Replace the line sensor box	46
Replace the printhead cleaning roll and aerosol filters	47
Move the printer	51
Preventive maintenance kits	52
Cleaning kit	52
Software maintenance	53
Maintain the HP Internal Print Server	53
Update the firmware	54
Update the IPS	54
Troubleshoot substrate issues	55
The substrate cannot be loaded successfully	55
The substrate has jammed	55
The substrate is not attached to the input core	56
The core slips on the Spindle (Dual Roll)	57
The collector stops winding prematurely (LX850 only)	58
The collector occasionally fails to work correctly (LX850 only)	58
The collector winds in the wrong direction (LX850 only)	58
The collector detaches the substrate from the spindle (LX850 only)	58
There is skew or telescoping on the collector (LX850 only)	58
The substrate has jammed on the collector (LX850 only)	59
The substrate sticks to the platen	59
The ink is still wet when the substrate emerges	59
The substrate is not flat	59
There are wrinkles in the substrate	60
There are ink marks on the substrate	62
There are drops of ink on the substrate	63
There are drops of oil on the substrate	63
The printed plot is shorter than expected	65
How to achieve better consistency between jobs of the same length	65
Troubleshoot print-quality issues	67
General advice	67
Banding	68
Vertical Banding in the printed area fills	70
Straight white lines in one color	71
Colors are misaligned	72
Colors are misaligned vertically	72
Colors are misaligned horizontally	73
Correcting misregistration	73
The print is grainy	74
The print is smudged	75
Edges of objects are rough or blurred	76
Colors look washed out	76
Colors are inaccurate	77
Colors shift unexpectedly	77
How to avoid Color Inconsistency	77
When printing using the tiling option	78
When performing ‘Nesting’	79
Neighboring area fill dependence	79
When printing area fills on some substrates	80
Blurred or defective areas on edges or lines	80
Troubleshoot double-sided printing	82
The printer will not let me print double-sided	82
Print-quality defects	82
Marks on the substrate	83
Substrate jams	83
The printer cannot detect the Image Registration Line	83
The printer cannot detect the left edge of the substrate	84
Excessive registration error along substrate movement direction	84
Excessive registration error along carriage movement direction	84
The relative position between side A and B was not as expected	85
Printing a queue using the double-sided functionality	85
The Internal Print Server shows only one row of jobs	85
The number of copies do not match between Side A and B	85
Printing double-sided does not respect the left edge position selected	86
The two sides of a double-sided job are not the same size	86
Troubleshoot ink cartridge and printhead issues	87
Cannot insert an ink cartridge	87
Cannot insert a printhead	87
The front panel recommends replacing or reseating an ink cartridge	87
The front panel recommends replacing or reseating a printhead	88
A printhead has overheated	89
A printhead has damaged the substrate	89
Incorrect printhead cleaning roll errors	89
Troubleshoot other issues	90
The printer does not start	90
The printer does not print	91
The printer seems slow	91
The HP Internal Print Server cannot retrieve an IP address	91
The HP Internal Print Server (IPS) cannot detect the printer	92
Print job files have not been properly deleted	92
Color calibration fails	93
Front-panel error messages	94
When you need help	98
Documentation	98
HP Proactive Support	98
HP Customer Care	99
HP Customer Care Centers	99
North America	99
Europe, Middle East and Africa	99
Asia and Pacific	100
Latin America	100
Service information	100
Preset creation flowchart	102
How to adapt your previously developed ‘substrate presets’ and ‘media profiles’ to the new LX610 Ink ...	103

Match case Limit results 1 per page

The Closed-Loop Color Calibration and Ink Restriction Test Chart contains printed ink ramps in 2%

steps, which can be useful as a visual guide for selecting the ink restriction percentages.

To print the Closed-Loop Color Calibration and Ink Restriction Test Chart, select

Substrate

Edit

Color

Print plot

Color profiles

Color calibration provides consistent colors, but consistent colors are not necessarily accurate. For

instance, if your printer prints all colors as black, its colors may be consistent but they are not accurate.

In order to print accurate colors, it is necessary to convert the color values in your files to the color

values that will produce the correct colors from your printer, your inks and your substrate. An ICC color

profile is a description of a printer, ink and substrate combination that contains all the information

needed for these color conversions.

These color conversions are performed by your Raster Image Processor (RIP), not by the printer. For

further information on the use of ICC profiles, see the documentation for your application software and

for your RIP.

Dynamic color registration

If your substrate expands or shrinks due to the heat applied in the printing process, you may notice

some color misregistration in your prints. You can reduce this problem using dynamic color registration,

as follows:

Print a test pattern from the HP Internal Print Server.

Select settings to correct the error in the HP Internal Print Server.

Consider performing dynamic color registration in the following cases:

●

When you notice color misregistration in your prints

●

When you use a substrate type for the first time

●

When printing double-sided

●

After replacing a printhead and aligning the printheads

The problem: color misregistration

Color misregistration means that colors are horizontally misaligned, in the direction of the carriage,

towards the center of the substrate. The misregistration is different on each side of the roll, and cannot

be corrected by printhead alignment. The examples shown here are magenta and black, because they

are the most visible, but misregistration can also occur with the other color pairs: magenta and cyan,

yellow and black, yellow and cyan.

Chapter 3

Printer calibration

ENWW

Printer calibration