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HP Latex 2700 User Guide 3 - Page 294

Printhead-to-substrate spacing., Coalescence., Some substrates, in some particular conditions

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If the substrate advance is incorrectly adjusted, particularly if it is under-advancing, a dark line can appear between passes. When the problem of line roughness or text quality applies to all colors and appears in the substrate axis direction, it is likely to be related to incorrect substrate advance. Another clue that could point to substrate advance as a cause is to observe that the defect is not constant, appearing and disappearing along the print in the substrate axis. To confirm it, see Substrate-advance verification on page 137. To correct the substrate advance, see Substrate-advance compensation on page 134. In most cases, this will solve the problem. However, you are recommended to run the OMAS Diagnostic Tests from the maintenance window as soon as the substrate is unloaded, to avoid having the same problem with other substrates. See Clean the substrate-advance sensor on page 174. ● Printhead-to-substrate spacing. Check the printhead-to-substrate spacing in the Internal Print Server. If it is higher than normal, try reducing it. Graininess The print shows a higher level of grain than expected, either throughout the print or in some specific areas. The example below shows more grain in the lower half than in the upper half. This can occur for various different reasons: ● Coalescence. Some substrates, in some particular conditions, can produce a type of grain due to wetting issues. For example, in high humidity or low temperature environments, the ink may not dry fast enough in fast print modes, producing a grainy effect on the print. The example below shows worse coalescence on the right-hand side. It is difficult to decide whether this kind of problem is due to wetting or to dot placement error (described below). The type of grain could be a clue: in the case of wetting issues, dots tend to aggregate into bigger dots, with empty spaces in between. A magnifying glass can be useful to examine the print in more detail. Graininess 287

Section	Page
Introduction	8
Welcome to your printer	8
Printer accessories and consumables	9
Documentation and useful links	9
Safety precautions	10
Main components	20
Printer software	22
Turn on the printer for the first time	22
Turn the printer on and off	23
Move the printer	24
Printer status beacon	25
HP Internal Print Server	27
Start the Internal Print Server	27
Internal Print Server widgets	28
Printer status and alerts	29
Update the printer’s firmware and software (Internal Print Server)	30
Internal Print Server settings and preferences	34
RIP distribution	35
Install and configure the RIP software	36
Install ONYX software and set up the driver	36
Install Caldera software and set up the driver	38
Printing workflows integration	41
Introduction to JDF	41
Benefits of working with JDF for file submission	41
Creating JDF job tickets	41
What printer information can be communicated to an MIS?	42
How to integrate the printer into the Caldera RIP	42
How to integrate the printer into the Onyx RIP	42
Job submission methods	42
How to integrate the printer into an MIS system or production control software	43
Handle the substrate	44
Supported substrate types	44
Supported HP substrates	46
Substrate tips	47
Color consistency	48
Substrate configurations	49
Prepare to print	50
Substrate edge holders	51
Load a roll onto the spindle	53
Load a roll into the printer	55
Double-sided printing	63
Output-platen light	67
Consistency mode (optimize for tiling)	67
Optimize for ink consumption	68
Create and manage print jobs	70
Add a new print job	70
Substrate presets	72
Use a new substrate	72
Prepare the printer for a new substrate	72
Add a substrate preset	72
Online substrate manager	78
Edit a substrate preset	83
Remove a substrate preset	86
Export multiple presets	86
Job properties	86
Set the carriage beam position	88
Handle the ink system	90
Ink system components	90
How to work with ink system components	93
Printing with white ink (2700W only)	120
Printer calibration	132
Align the printheads	132
Possible difficulties with printhead alignment	138
Color calibration	139
Color consistency between different HP Latex 2700 series printers	141
Color profiles	141
Substrate-advance compensation	141
Calibrations specific to one substrate preset	146
Recommended calibrations after particular events	146
Accessories	147
Accessory compatibility	147
Spindle	147
Dual-roll printing	148
Jumbo dual-roll kit	150
Diverter roller	151
In-line slitters	152
Substrate saver	154
Ink collector	159
Roll to free fall	164
Roll to collector	164
Hardware maintenance	166
Safety precautions	166
Maintenance resources	166
Summary of maintenance operations	168
How to perform maintenance operations	169
Diagnostics	266
Troubleshoot substrate issues	269
Substrate cannot be loaded successfully	269
Substrate has jammed	269
Substrate is not attached to the core and/or spindle	270
Substrate is not flat	271
Spindle latch suddenly opens during printer operation	271
Substrate advances with a loud continuous sound of vibration	271
There is skew or telescoping on the output spindle	272
There are wrinkles and ink smears on the substrate	273
There are ink marks on the substrate	276
Substrate sticks to the platen	276
There are physical marks on the substrate	277
There are drops of ink on the substrate	278
Print is shorter than expected	279
How to achieve better consistency between jobs of the same length	279
Collector stops winding	280
Collector occasionally fails to work correctly	280
Collector winds in the wrong direction	281
Substrate is detached or winds around the collector in the wrong direction	281
There is skew or telescoping on the collector	281
Substrate has jammed on the collector	281
Troubleshoot print-quality issues	282
General advice	282
Basic and advanced troubleshooting	283
Troubleshoot ink cartridge and printhead issues	298
Ink cartridges	298
Printheads	299
Printhead cleaning roll errors	304
Troubleshoot other issues	305
Printer does not start	305
Printer does not print	305
Printer cannot be restarted from the Internal Print Server	305
Printer seems slow	306
Request to reinitialize the carriage	306
Internal Print Server cannot detect the printer	306
Color calibration fails	306
Movable Slot System sensor errors	307
When you need help	309
HP Customer Care	309
HP PrintOS: the cloud-based platform for print specialists	309
Printer specifications	330
Functional specifications	330
Physical specifications	331
Memory specifications	332
Power specifications	332
Air supply requirements (pneumatic spindle)	332
Environmental specifications	333
Acoustic specifications	333
Flexible substrate recommendations	335
Predefined substrate settings	335
Self-adhesive vinyls	335
PVC banners	336
Papers	336
Textiles	337
Flexible films	337
Print-quality-troubleshooting summary table	339
Glossary	340

Match case Limit results 1 per page

If the substrate advance is incorrectly adjusted, particularly if it is under-advancing, a dark line can appear

between passes. When the problem of line roughness or text quality applies to all colors and appears in the

substrate axis direction, it is likely to be related to incorrect substrate advance. Another clue that could point

to substrate advance as a cause is to observe that the defect is not constant, appearing and disappearing

along the print in the substrate axis.

To conﬁrm it, see

Substrate-advance

veriﬁcation

on page

137

To correct the substrate advance, see

Substrate-advance compensation

on page

134

. In most cases, this will

solve the problem. However, you are recommended to run the OMAS Diagnostic Tests from the maintenance

window as soon as the substrate is unloaded, to avoid having the same problem with other substrates. See

Clean the substrate-advance sensor

on page

174

●

Printhead-to-substrate spacing.

Check the printhead-to-substrate spacing in the Internal Print Server. If it is

higher than normal, try reducing it.

Graininess

The print shows a higher level of grain than expected, either throughout the print or in some speciﬁc areas. The

example below shows more grain in the lower half than in the upper half.

This can occur for various diﬀerent reasons:

●

Coalescence.

Some substrates, in some particular conditions, can produce a type of grain due to wetting

issues. For example, in high humidity or low temperature environments, the ink may not dry fast enough in

fast print modes, producing a grainy eﬀect on the print. The example below shows worse coalescence on the

right-hand side.

It is diﬀicult to decide whether this kind of problem is due to wetting or to dot placement error (described

below). The type of grain could be a clue: in the case of wetting issues, dots tend to aggregate into bigger

dots, with empty spaces in between. A magnifying glass can be useful to examine the print in more detail.

Graininess

287