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EPSON Stylus PHOTO 810/820/830 Revision B
Troubleshooting Unit Level Troubleshooting 80
Table 3-18. Poor printing quality
Error condition
Occurrence
timing
CR position at the
power on timing
Phenomenon Unit/Part name Possible cause Check table
Poor printing
quality
Operation -
Dot missing
No printing
Misalignment
Mixed color
Cap unit
The seal rubber portion of the Cap has any foreign material
or any damage.
Refer to Table 3-19
The spring under the Cap comes off.
The Pump tube comes off from the bottom of the Cap.
The Extension spring 0.523 (for the Slider cap) comes off.
The Extension spring 0.383 (for the Slider lock lever) comes
off.
The Slider lever is damaged.
Ink cartridge The ink amount in I/C is end condition.
Main board The Main board is defective.
Printhead
The Printhead has any foreign material on the nozzle surface.
The Printhead is defective.
The Head FFC is damaged.
Vertical banding
against the CR
movement direction
CR motor The accuracy of the CR motor is lowered.
CR unit
The CR guide shaft has any stain or any damage.
The lubrication amount of the grease is insufficient.
The Torsion spring for the CR guide shaft comes off.
The both I/C is not hold by the I/C cover securely.
Front frame
The lubrication amount of the grease is insufficient.
The Front frame is bent up or down.
Printhead Each segment is printed correctly in the nozzle check pattern.