HP Latex 280 Users guide - Page 132

Adjust the substrate advance, Substrate advance adjustment on the fly

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◦ Align the printheads (see Align the printheads on page 89). If necessary, align them manually. ◦ Print the printhead status plot again. Identify the printhead with the greatest number of blocked nozzles, and replace it. ◦ If bands appear and disappear intermittently, go to the front panel and press , then , then Ink > Image-quality maintenance > Extra PH cleaning > On. Remember to turn this option off when you no longer need it, because it shortens the life of the printhead cleaning kit. ● If bands affect most of the colors, the printheads could be misaligned. This is likely if you have not aligned the printheads for a long time, or if there has been a substrate jam. Align the printheads if necessary (see Align the printheads on page 89). You can check whether it is necessary by using the printhead status plot (see Use the printhead status plot on page 123). ● If banding occurs mostly in black areas, create a new color profile using pure black and not a mixture of other colors. See your RIP documentation. If the problem persists, call your service representative (see HP Customer Care Centers on page 153). Adjust the substrate advance The substrate advance sensor measures the advance of the substrate and compensates for irregularities at every pass of the printheads. However, to fine-tune the quality of your print, you may need to calibrate the rate at which the substrate advances. The substrate advance determines the placement of dots on the substrate. If the substrate is not advanced correctly, light or dark bands appear in the printed image and the grain in the print may increase. You can modify the substrate advance with the Substrate Advance parameter in the RIP's substrate preset. 1. On the front panel, press , then , then Ink > Image-quality maintenance > Substrate advance calib > Print adjustment plot. The printer prints a substrate-advance adjustment image. 2. The calibration image consists of several columns with a number at the bottom of each one. Locate the lightest of the columns and enter its number into the RIP's Substrate Advance parameter for the current substrate preset. The value chosen in this example should be "-6". Substrate advance adjustment on the fly If you are using no more than six passes, you can fine-tune the substrate advance while printing: press , then Adjustments > Adjust substrate advance. Select a value of change from -10 mm/m to +10 mm/m (or mils/inch). To correct light banding, decrease the value. To correct dark banding, increase the value. If you are using eight passes or more, a wrong advance adjustment will not produce banding but graininess, which is harder to assess visually. Therefore, in this case you are recommended to use only the adjustment plot. 126 Chapter 13 Troubleshoot print-quality issues ENWW

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◦
Align the printheads (see
Align the printheads
on page
89
). If necessary, align them manually.
◦
Print the printhead status plot again. Identify the printhead with the greatest number of blocked
nozzles, and replace it.
◦
If bands appear and disappear intermittently, go to the front panel and press
, then
,
then
Ink
>
Image-quality maintenance
>
Extra PH cleaning
>
On
. Remember to turn this option
off when you no longer need it, because it shortens the life of the printhead cleaning kit.
●
If bands affect most of the colors, the printheads could be misaligned. This is likely if you have not
aligned the printheads for a long time, or if there has been a substrate jam. Align the printheads if
necessary (see
Align the printheads
on page
89
). You can check whether it is necessary by using the
printhead status plot (see
Use the printhead status plot
on page
123
).
●
If banding occurs mostly in black areas, create a new color profile using pure black and not a mixture of
other colors. See your RIP documentation.
If the problem persists, call your service representative (see
HP Customer Care Centers
on page
153
).
Adjust the substrate advance
The substrate advance sensor measures the advance of the substrate and compensates for irregularities at
every pass of the printheads. However, to fine-tune the quality of your print, you may need to calibrate the
rate at which the substrate advances. The substrate advance determines the placement of dots on the
substrate. If the substrate is not advanced correctly, light or dark bands appear in the printed image and the
grain in the print may increase.
You can modify the substrate advance with the Substrate Advance parameter in the RIP's substrate preset.
1.
On the front panel, press
, then
, then
Ink
>
Image-quality maintenance
>
Substrate
advance calib
>
Print adjustment plot
. The printer prints a substrate-advance adjustment image.
2.
The calibration image consists of several columns with a number at the bottom of each one. Locate the
lightest of the columns and enter its number into the RIP's Substrate Advance parameter for the current
substrate preset. The value chosen in this example should be “
–
6”.
Substrate advance adjustment on the fly
If you are using no more than six passes, you can fine-tune the substrate advance while printing: press
,
then
Adjustments
>
Adjust substrate advance
. Select a value of change from
–
10 mm/m to +10 mm/m (or
mils/inch). To correct light banding, decrease the value. To correct dark banding, increase the value.
If you are using eight passes or more, a wrong advance adjustment will not produce banding but graininess,
which is harder to assess visually. Therefore, in this case you are recommended to use only the adjustment
plot.
126
Chapter 13
Troubleshoot print-quality issues
ENWW