Epson Stylus Pro 7700 Service Manual page 151

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