Pro 7900 and 9900 Field Repair Guide 10/6/10
Horizontal Banding Printer Component, Software Item, LCD Display, Printer Button Page 224.
Horizontal Banding
Note: Horizontal Banding is either paper feed related, or Print Head related.
Horizontal Banding is caused by vertical dot placement errors.
Feed Related
Feed related horizontal banding is always spaced at the same interval as the MicroWeave step. Observe the area of
the image that is currently being printed (the image directly under the Print Head). That area exhibits the
MicroWeave step. Compare the interval of the MicroWeave step with the interval of the horizontal banding. If the two
have the same interval, the banding is probably feed related.
Increase or decrease (increase or decrease to the extreme limit) the feed step and observe the impact on the band-
ing. Use the Paper Config section of the driver, or Custom Paper section of the Printer’s user menu, and increase
or decrease the feed step all the way. If the banding is affected, it is feed related. If the banding is not changed, or a
new banding is added, it is not feed related.
Use another Computer with the Epson Driver and Epson Media to eliminate the users equipment.
Verify that the proper tension setting is being used. Check the Paper Config section of the driver, or Custom Paper
section of the Printer’s user menu
Verify that the media does not bind coming off the roll.
Use Remote Panel to verify that the user has not modified the paper feed table value for the media that is banding.
Print Head Related
If the horizontal banding is Print Head related, it is usually due to missing, deflected or sympathetic Nozzles. the ser-
vice level Nozzle Check, is the best way to inspect the Print Head’s accuracy. A slightly deflected Nozzle can cause
horizontal banding, depending on the Nozzle’s location in the Nozzle array.
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