EPSON Stylus CX4300/CX4400/CX5500/CX5600/DX4400/DX4450 Revision A
TROUBLESHOOTING Troubleshooting 55
Table 3-16. Check point for the poor printing quality
Print Quality
State
Detailed phenomenon
Defective
unit/part name
Check point Remedy
• Dot missing and
mixed colors
Ink is scarcely ejected to the Cap from
the Print Head.
Ink System Unit
(Cap Unit)
1. Check if there is not any foreign material/damage around
the seal rubber part on the Cap Unit.
1. Remove the foreign material around the seal
rubber parts carefully.
2. Check if the Compression Spring is correctly mounted on
the Cap Unit.
2. Replace the Ink System Unit with a new one.
Ink is ejected to the Cap from the Print
Head, but the SPC does not recover from
the error after cleaning or ink change.
Print Head
1. Check if it returns to normal by performing CL operation
or replacing the Ink Cartridge.
1. Perform CL operation and the Ink Cartridge
replacement specified times.
If it doesn’t work, change the Print Head with
a new one.
2. Check if the Print Head is not damaged. 2. Replace the Print Head with a new one.
Cleaner Blade
1. Check if the Cleaner Blade does not have paper dust or
bending.
1. Replace Ink System Unit with a new one.
Main Board 1. Check if the Main Board is not damaged. 1. Replace the Main Board with a new one.
Seal rubber part
Compression
Spring
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