A common issue with Epson inkjet printers is the appearance of "double" text, blurred characters, or misaligned image contours. While the printer remains operational, the print quality deteriorates significantly.
Let’s examine this type of malfunction using the Epson L850—a six-color inkjet photo printer—as an example.
On a test page, you may notice a slight displacement of character outlines. Such a defect can be caused by incorrect positioning of the print head, contamination of the encoder strip, or a malfunction in the carriage movement mechanism.
Primary causes of "double" text:
1. Misalignment of the print head
One of the most likely causes is improper calibration of the print head.
During bidirectional printing, the carriage moves in both directions. If the print head’s position is not correctly calibrated, ink droplets are applied with a slight offset, causing characters to appear doubled.
2. Contamination of the encoder strip
The encoder strip is a transparent plastic strip with markings on it, used to track the position of the print head.
If ink, dust, or other debris accumulates on this strip, it can lead to errors in carriage positioning.
3. Malfunction of the carriage movement mechanism
Wear on the guide rail, improper belt tension, or mechanical play (looseness) can negatively affect the precision of the print head's movement.
4. Print head issues
Clogged nozzles or a deviation in the direction of ink ejection can sometimes cause character distortion and a loss of print sharpness.
How is the Epson L850 diagnosed?
To identify the cause of the malfunction, a systematic check is performed:
1. Printing a nozzle test pattern to evaluate the condition of the print head. 2. Checking print quality in various modes.
3. Testing unidirectional and bidirectional printing.
4. Checking and adjusting print head alignment.
5. Inspecting the encoder strip for contamination.
6. Checking the carriage movement mechanism.
If the "ghosting" (double-imaging) disappears after disabling high-speed bidirectional printing, it indicates a potential issue with print head positioning during bidirectional operation.
How can text ghosting be resolved?
The solution depends on the diagnostic results.
In some cases, performing a software-based print head alignment is sufficient.
If the encoder strip is dirty, it may need to be carefully cleaned, following the manufacturer's recommendations.
If the problem is caused by mechanical wear, the carriage movement assembly will require further inspection.
Important: Repeatedly cleaning the print head will not fix positioning errors and will only result in unnecessary ink consumption.
Epson Printer Repair in the City of Konayev
IT-SERVICE provides diagnostic, maintenance, and repair services for Epson inkjet printers.
We offer print quality checks, print head diagnostics, maintenance of carriage movement mechanisms, and troubleshooting for various print issues.
If your Epson L850 or any other inkjet printer has started producing ghosting, streaks, or blurry characters, please contact IT-SERVICE.
IT-SERVICE — Printer diagnostics and repair in the city of Konayev.
Comments
There is no data here up to now
Add New Comment