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 149
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3.7 Remedies for Print Quality Troubles
3.7.1 Remedies for Print Quality Troubles
This section provides troubleshooting of print quality troubles classifying them by observed symptom.
Before performing troubleshooting, refer to “ PRINT IMAGE (p360)” and print the test pattern. Confirm the printed result of the test pattern, and if any maladjustment is found,
perform the adjustment.
Symptom Description Remedy/Points to be checked
Dot missing Ink stuck inside/on the surface of the nozzles. Perform a cleaning (normal cleaning, clean each color, power cleaning).
The pump is not operating normally. Check the connection of the pump tube.
Check if there is any broken or pressed part on the pump tube.
Check the connection of the Pump Motor.
Replace the Ink System Unit. (See P.266)
The Wiper is not operating normally. Check the Wiper for any damage.
Check the connection of the Wiper Motor.
Replace the Ink System Unit. (See P.266)
There is something wrong in the ink path. Check the connections between Ink Cartridge, Ink Cartridge Holders, Ink tubes,
Damper, and the Printhead for abnormality.
The Head FFC is not connected correctly. Check the connection of the Head FFC, and if there is abnormality (slant
connection or the like), correct it.
The case those remedies above do not improve the symptom. Replace the following parts:
• Ink System Unit (See P.266)
• Printhead (See P.270)
• Main Board Assy (See P.228)
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