A perfectly calibrated printer will show a straight vertical lighter line
in the 0 column. If the lighter line is printed in any of the other
columns, this would indicated there is a constant advance offset along
the entire plot. If the offset is bigger than ± 2.95mm per meter (the
lighter column is not the center one), this can be adjusted by using the
button on the front panel to change the compensation of the substrate
advance as the printer prints.
It is very important to verify that the substrate selected on the front panel, is the
same as the actual substrate loaded on the printer. You can verify the substrate type
selected through the Front Panel (Main Menu>Paper Menu>View Loaded paper). If
an incorrect substrate is selected, this will produce an offset error in the Paper
Advance.
Corrective Action
The figure shown here (left) shows a vertical lighter shaded line placed at column -
3, which indicates an offset of 8.57mm per meter.
This can be adjusted by using the button on the front panel to change the parameters
as the printer prints.
• If the lighter line is in the negative column, increase the
compensation of the substrate advance.
• If the lighter line is in the positive column, decrease the
compensation of the substrate advance.
When the lighter shaded line is in position 0, the process is complete.
If the advance is not a straight line, this would indicate that the printer has a variable
advance error.
If this is the case verify the following:
• Check to see if the OMAS is clean, if it is not clean the OMAS and
reload the substrate and repeat the diagnostic plot.
• Check that the OMAS is functioning correctly. Check the light in the
OMAS blinks while the substrate moves while an image is being
printed.
• Check that the OMAS can function correctly with the type of
substrate loaded. If is cannot, for example with high gloss substrate,
disable the OMAS from the RIP and reprint the diagnostic plot.
To Next Page
Loading...