HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 28

NOTE:

Important notes when using the new calibration plot:

Certain types of substrate can sometimes skew in the substrate path, which causes the

calibration to drift overtime. When loading the substrate for the calibration make sure

that the substrate is loaded correctly and check that there is no skew. If necessary

recalibrate when needed.

Some substrate types deform under temperature more than others, with certain types of

substrate the amount of deformation is too much and the calibration functionality in the

printer cannot compensate (A or B over 30 or below -30).

It is important to note that when using 8 pass unidirectional printmode with the 100%

density substrate category the correcting capability is half compared to any other

printmode.

b.

Color Registration:

By checking the vertical lines from the output. The A value affects

printing on the right-hand side of the substrate, while the B value affects printing on the left-

hand side. Increasing the value moves magenta to the left, decreasing it moves magenta to

the right, and click on Apply

The calibration (color registration) will be visible after a certain length of substrate has been

printed. The length will depend on the print mode. Examples:

●

With a 2-pass print mode, about 1 m (40 in) of substrate will be printed before the

calibration takes effect.

●

With a 4-pass print mode, about 0.5 m (20 in) of substrate will be printed before the


●

With an 8-pass print mode, about 0.25 m (10 in) of substrate will be printed before the


Which calibrations are specific to a certain substrate preset or

printmode

Some calibrations that the printer performs are specific to the substrate that was loaded at the time the

calibration was performed and some are not. The calibrations that are specific to the loaded substrate

must be performed again if the substrate is changed. Shown below are the calibrations showing which

ones are specific to the substrate loaded and which ones are not.

●

Printhead Alignment

: This calibration is applied to all presets and printmodes. Usually, when

switching from one substrate to another, there is no need to redo this calibration, however if

printing in bidirectional where the variation in thickness of the substrate could impact the

bidirectional alignment, then the calibration would need to be performed again.

●

Dynamic Color Registration

: This calibration is defined per substrate preset. It should also be

noted that when changing from one printmode to another the printing behavior of the substrate

may change, there may be increased contraction for example, also if the heating and curing

temperatures, air flow are changed. In these cases it is better to create two separate substrate

presets, with the different printmodes,

●

Substrate Advance Compensation

: This calibration is specific per preset substrate per

printmode. When changing from one printmode to another (even from uni to bidi), the Substrate

Advance Calibration must be performed again. The ED and GN share the same substrate

advance calibration.

●

Color Calibration

: This calibration is per substrate preset.

22

Chapter 3

Printer calibration

ENWW

Printer calibration

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

HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 28

Which calibrations are specific to a certain substrate preset or printmode, Color Registration

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