Epson SureColor F7170 User Manual page 136

Horizontal lines or strips of uneven color (banding)
Multiple causes are possible.
Perform the following sequence until the print results have improved.
Before starting work, always perform a nozzle check and Head Alignment. If nozzles are
clogged or the head is misaligned, no measures will result in improvements. See
"Checking for Clogged Nozzles" on page 84 and "Correcting Print Misalignment (Head
Alignment)" on page 73.
1. Check the attachment of the media holding plates.
If a media holding plate is not installed correctly, media feeding may be disturbed. See
the following reference and reattach the media holding plates. See "Loading and
Exchanging Media" on page 30.
If installing the media holding plate correctly still does not resolve the problem, perform
the following measure.
2. Perform Feed Adjustment.
Feed adjustment may be required independently depending on the media used. If the
roll width is different, independent adjustment is required even with the same media.
For more accurate adjustment, print a test pattern using the following settings: Manual
- 500mm Pattern. See "Feed Adjustment" on page 76.
Stains due to head striking
The media and print head are contacting during printing.
Problem Solver 136