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HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 39

Clean the printheads, Clean the substrate-advance sensor, Printer, Printhead cleaning

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Clean the printheads The printheads should all be cleaned regularly, once a week. In addition, it is worth cleaning the printheads if you are experiencing poor print quality and cannot resolve the issue by other methods. Cleaning ensures that there is fresh ink in the nozzles and helps to prevents clogged nozzles. If you have printed the printhead status plot, you know which colors are failing. Clean the printheads that are not performing adequately. If you are not sure which printheads to clean, clean all of the printheads. To clean the printheads, go to the HP Internal Print Server and select Printer > Printhead cleaning. HP recommends the Check and Clean option. Maintain hardware If you decide on a hard clean, you can select which printheads to clean. Clean the substrate-advance sensor The substrate-advance sensor should be cleaned periodically (every 1 to 3 months, depending on the printer usage and substrate type-see note below), whenever you clean the platen, and whenever you have printed by accident directly onto the platen. See Clean the platen on page 32. The printer displays no periodic alert to remind you, but it will notify you if the sensor becomes unusable. NOTE: Porous substrates or liners can allow small amounts of ink to pass through to the platen and sensor window, to the extent that a clean sensor can become dirty before finishing a single roll. For this reason, it is best to disable the sensor when loading a porous substrate, and to clean the platen and sensor before loading another substrate. The sensor is located between the second and third group of three pinches, in the middle of the platen. TIP: You may need a ladder to reach the sensor. TIP: Cleaning is easily done by reaching over the carriage beam in its low position. If you try to do it by putting your arms below the beam in its high position, you will find it more difficult to access the sensor and to check that it is clean. 1. Unload the substrate. ENWW Clean the printheads 33

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

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Clean the printheads

The printheads should all be cleaned regularly, once a week. In addition, it is worth cleaning the

printheads if you are experiencing poor print quality and cannot resolve the issue by other methods.

Cleaning ensures that there is fresh ink in the nozzles and helps to prevents clogged nozzles.

If you have printed the printhead status plot, you know which colors are failing. Clean the printheads

that are not performing adequately. If you are not sure which printheads to clean, clean all of the

printheads.

To clean the printheads, go to the HP Internal Print Server and select

Printer

Printhead cleaning

HP recommends the Check and Clean option.

If you decide on a hard clean, you can select which printheads to clean.

Clean the substrate-advance sensor

The substrate-advance sensor should be cleaned periodically (every 1 to 3 months, depending on the

printer usage and substrate type—see note below), whenever you clean the platen, and whenever you

have printed by accident directly onto the platen. See

Clean the platen

on page

. The printer

displays no periodic alert to remind you, but it will notify you if the sensor becomes unusable.

NOTE:

Porous substrates or liners can allow small amounts of ink to pass through to the platen and

sensor window, to the extent that a clean sensor can become dirty before finishing a single roll. For this

reason, it is best to disable the sensor when loading a porous substrate, and to clean the platen and

sensor before loading another substrate.

The sensor is located between the second and third group of three pinches, in the middle of the platen.

TIP:

You may need a ladder to reach the sensor.

TIP:

Cleaning is easily done by reaching over the carriage beam in its low position. If you try to do it

by putting your arms below the beam in its high position, you will find it more difficult to access the

sensor and to check that it is clean.

Unload the substrate.

ENWW

Clean the printheads

Maintain hardware