Epson Stylus PHOTO 820 Service Manual page 72

EPSON Stylus PHOTO 810/820
Occurrence CR position at the
Error condition
timing power on timing
Poor printing
Operation
quality
Troubleshooting
Table 3-18. Poor printing quality
Phenomenon
Dot missing
No printing
Misalignment
Mixed color
-
Vertical banding
against the CR
movement direction
Unit Level Troubleshooting
Unit/Part name
The seal rubber portion of the Cap has any foreign material
or any damage.
The spring under the Cap comes off.
The Pump tube comes off from the bottom of the Cap.
Cap unit
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.
The Printhead has any foreign material on the nozzle surface.
Printhead The Printhead is defective.
The Head FFC is damaged.
CR motor The accuracy of the CR motor is lowered.
The CR guide shaft has any stain or any damage.
The lubrication amount of the grease is insufficient.
CR unit
The Torsion spring for the CR guide shaft comes off.
The both I/C is not hold by the I/C cover securely.
The lubrication amount of the grease is insufficient.
Front frame
The Front frame is bent up or down.
Printhead Each segment is printed correctly in the nozzle check pattern.
Possible cause
Refer to Table 3-19
Revision A
Check table
72