Interpreting plot results
The three plots are all printed using Photo Black ink in 6-pass print mode (even on Gloss paper) and should
should each be similar. The white/lightest band of must be within the center ±1 area for a PASS result. This
should be true for all three plots or the printer will have differential banding (a difference of advance
between the left and right). There is a 3-inch white band before the plots to ensure there is no platen noise
causing advance errors while the media is covering the platen.
Example acceptable plot
The following illustration shows an example of a PASS plot.
Example defective advance plot
This defect has the follow possible causes:
●
OMAS is not clean or is defective so you should repeat the plot with OMAS disabled. This will allow you
to establish if this is an OMAS related fault. If the same fault is detected the problem cannot be
attributed to OMAS.
●
The Drive roller is not clean so it slips against the media.
●
Any other component affecting the media advance:
◦
Spindle/Back Tension
◦
Input roller
◦
Pinchwheels
156 Chapter 7 Print quality ENWW
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