Grainy Or Ghosting - Epson Stylus pro 7900 Repair Manual

Pro 7900 and 9900 Field Repair Guide
Note: Grainy refers to an image that does not have smooth tonal transitions, or sharp resolution.
Note: Ghosting refers to components of an image that are intended to be on top of each other (or
adjacent) but are offset.
Note: A low resolution image can be mis-diagnosed as Grainy.
Using your Computer, Driver, and Application, verify that it is not the users equipment that is causing the print qual-
ity issue.
• Non-Epson media or improper media settings in the driver can cause grainy images.
• Non-Epson Ink can cause Grainy print quality.
• A non-Epson Driver can cause Grainy print quality.
Grainy or ghosted images are usually caused by electronic or mechanical adjustments. The following is a list of
adjustments that should be checked.
• CR Heat Slant adjustment
• PF Slant adjustment
• Gap Adj: Auto Bi-D
• Gap Adj: Auto Uni-D
Additionally the proper Print Head to media gap should be verified (Standard, Narrow, Wide, Wider, and Widest).
Most media prints best at the Standard Gap (one gap away from the closest).
Intermittent or missing Nozzles may also be a factor.
The following components occasionally cause the issue.
• Carriage Encoder
• Carriage Encoder Strip
• Carriage Motor
• Carriage Belt Tension

Grainy or Ghosting

Grainy or Ghosting
adjustment
adjustment
Printer Component, Software Item, LCD Display, Printer Button
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