Epson Stylus Pro 7890 Series, Service Manual, Page: 151 / 519

Epson Stylus Pro 7700/7710/7700M/7710M/7900/7910/9700/9710/9900/9910/WT7900/WT7910/9890/9908/7890/7908 Revision I
TROUBLE SHOOTING Remedies for Print Quality Troubles 151
Confidential
Horizontal banding Paper setting made in the printer driver is wrong. Correct the paper setting of the printer driver.
There is something wrong with paper feeding. Check the PF Scale for scratch, contamination, and correct it if any.
Check the PF Encoder for contamination, and clean it if needed.
Carry out the T&B&S Adjustment.
(See P.409)
Carry out the PF Timing Belt Tension Adjustment. (See P.404)
Replace the PF Encoder Sensor. (See P.263)
Replace the PF Motor. (See P.264)
The printhead has not been adjusted properly. Carry out the Printhead Slant Adjustment (CR). (See P.378)
Carry out the Printhead Slant Adjustment (PF). (See P.381)
If the banding occurs soon after replacing the Main Board Assy, the parameter
settings of the NVRAM may be incorrect. Import the NVRAM parameters from the former Main Board Assy.
The Printhead has a defect. Replace the Printhead. (See P.270)
Vertical banding Adjustments have not been carried out properly. Carry out the Auto Uni-D Adjustment. (See P.383)
Carry out the Auto Bi-D Adjustment. (See P.384)
The carriage unit cannot move smoothly. Check the CR Timing Belt and the Drive Pulley for a defect.
Check the CR motor is correctly installed and correct it if there is abnormality.
Carry out the CR Timing Belt Tension Adjustment. (See P.364)
Symptom Description Remedy/Points to be checked