HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 73

Colors are misaligned horizontally, Correcting misregistration, position

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Print-quality issues Colors are misaligned horizontally 1. Check printhead alignment and correct it if necessary. See Align the printheads on page 9. 2. If the problem persists despite automatic printhead alignment, try manual printhead alignment. 3. Ensure that the substrate is not skewed. If there is any skew, reload the substrate to correct it. 4. Check the carriage beam position. If it is high and the substrate type doesn't require a high position, lower it. 5. If the misalignment appears at the sides of the substrate but not in the center, you have a problem of substrate expansion. 6. If you see the problem in printed black text, check in your application or in the RIP that the text color is pure black and does not contain other colors. Correcting misregistration Here we explain the procedure for correcting misregistration 1. Check the printhead alignment and correct if it is necessary (if lines of a single color are blurry or doubled, the chances are that printhead alignment is not good). See Align the printheads on page 9, if the problem persists after automatic printhead alignment, try the manual printhead alignment. 2. Check carriage beam position. If it is in a higher position than the substrate type (normal printing position), move it to a lower position (if the beam is in a high position, edges, text and lines will be surrounded by a significant amount of spray). 3. Check whether the substrate suffers from skew when advancing. Check for movements of the substrate edges (look for telescoping on the roll in the substrate output roller). Reload the substrate if necessary to correct it. If the substrate does still not stabilize change the appropriate parameters in the substrate settings (i.e. vacuum and tensions). ENWW Colors are misaligned 67

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Colors are misaligned horizontally
1.
Check printhead alignment and correct it if necessary. See
Align the printheads
on page
9
.
2.
If the problem persists despite automatic printhead alignment, try manual printhead alignment.
3.
Ensure that the substrate is not skewed. If there is any skew, reload the substrate to correct it.
4.
Check the carriage beam position. If it is high and the substrate type doesn't require a high
position, lower it.
5.
If the misalignment appears at the sides of the substrate but not in the center, you have a problem
of substrate expansion.
6.
If you see the problem in printed black text, check in your application or in the RIP that the text
color is pure black and does not contain other colors.
Correcting misregistration
Here we explain the procedure for correcting misregistration
1.
Check the printhead alignment and correct if it is necessary (if lines of a single color are blurry or
doubled, the chances are that printhead alignment is not good). See
Align the printheads
on page
9
, if the problem persists after automatic printhead alignment, try the manual printhead
alignment.
2.
Check carriage beam position. If it is in a higher position than the substrate type (normal printing
position), move it to a lower position (if the beam is in a high position, edges, text and lines will
be surrounded by a significant amount of spray).
3.
Check whether the substrate suffers from skew when advancing. Check for movements of the
substrate edges (look for telescoping on the roll in the substrate output roller). Reload the substrate
if necessary to correct it. If the substrate does still not stabilize change the appropriate parameters
in the substrate settings (i.e. vacuum and tensions).
ENWW
Colors are misaligned
67
Print-quality issues