Double Printing in the X-axis Direction — Electronic Board / Software Issue (Episode 6)
Symptom → Cause Hypothesis → Inspection Order → Solution
✅ Who Should Read This
- Users experiencing overlapping image output in the X-axis direction during UV printer printing
- Users with irregular print errors where some sections print normally while others show double printing
- Maintenance personnel who need to determine whether the issue is caused by the electronic board or mechanical components
- Anyone who wants to understand how the head carriage position recognition works and the role of the liner scale
⚠️ Precautions (Protecting High-Cost Components)
- The liner scale is an extremely thin film — wiping it hard with a rough cloth or alcohol can cause damage.
- If the liner scale graduations are scratched or damaged, the sensor will fail to read the position and print errors will repeat.
- During maintenance work, ink splashing onto the liner scale can contaminate the graduations — always protect it during any service work.
- If the issue is physical damage rather than contamination, the liner scale must be replaced, not cleaned.
🧭 Key Summary (Field Judgment)
- If double printing in the X-axis occurs only in specific sections, liner scale contamination is likely.
- The head carriage reads the liner scale graduations to determine its current position.
- If the graduations are obscured by dust or foreign matter, position recognition fails and images overlap in output.
- The first step is to clean the liner scale with a soft cloth. If it is damaged, replacement is required.
UV Printer Knowledge Base · Troubleshooting · Printable Products
All UV Printer related content is organized below. Click each item to go to the relevant article.
1) Ink Supply
23 articles on print errors caused by ink supply issues including cleaning and pumping
2) Print Head Issues
12 articles covering everything from head replacement to head-related problems
For a deeper understanding of print heads: Print Head Fundamentals — 9 Articles
3) Mechanical Issues
4) RIP Software
5) Products You Can Make with a UV Printer
This series covers electronic board (including Head Board) and software-related issues.
In Episode 1, we covered “Printing motion occurs but no ink comes out.”
In Episode 2, we covered “How to restore software settings to the original installation values.”
In Episode 3, we covered “The touch panel does not turn on when the power is switched on.”
In Episode 4, we covered “Printing starts from the wrong position.”
In Episode 5, we covered “The software shuts down as soon as the print button is pressed.”
Today we will explain the issue of double printing in the X-axis direction.
I. Symptom — Double Printing in the X-axis Direction
As shown in the photo below, the issue appears as overlapping print output in the X-axis direction.
Some sections print normally, while other sections show the image overlapping in the X-axis direction.
The pattern is irregular.
II. Cause & Solution — Double Printing in the X-axis Direction
1. Contamination on the X-axis Liner Scale
The X-axis liner scale was wiped with a soft cloth, and during the process, what appeared to be a thread-like fiber was found attached to it.
2. Normal Print Result
Printing was performed again after cleaning, and the output was normal as shown below.
The cause of the problem is explained below.
- The thin film that was wiped with a soft cloth is called the Liner Scale.
- Although invisible to the naked eye, the film contains a large number of fine graduation marks.
- On the back of the head carriage, there is a liner scale reader that reads these graduation marks.
- When printing, the reason ink is ejected at exactly the right position along the X-axis is that the liner scale reader continuously reads the liner scale to detect the carriage’s current position.
- However, if the graduation marks on the liner scale are obscured by dust or other contaminants, the liner scale reader can no longer detect its current position.
- The head carriage continues to move by inertia, but having lost its positional reference, it ejects ink at incorrect positions.
- As a result, some sections print normally while other sections have image data ejected at the wrong position, causing double printing in the X-axis direction as shown in the photos above.
If some sections in the X-axis print normally while others show double printing, a specific section of the liner scale may be contaminated. Wiping the liner scale with a soft cloth is the first solution to try.
However, in the following cases, the liner scale must be replaced.
- When the liner scale graduation marks are physically damaged by a sharp object — not contamination
- When the liner scale is contaminated with ink and the ink cannot be removed no matter how carefully it is cleaned
For these reasons, always take care when placing or removing materials on the flatbed to avoid damaging the liner scale. During maintenance work such as replacing dampers or the cap top, be careful to prevent ink from splashing onto the liner scale.
III. ARTJET UV Printer
After more than 5 years of selling and servicing ARTJET UV printers, there is one thing we have come to feel is most important.
Next to product stability, the most important thing is the accumulation of troubleshooting data.
Any machine can develop problems depending on the operating environment, working conditions, and user experience level. What truly matters on the production floor is not “a machine that never breaks down” —
It is how quickly and how accurately the cause can be identified and resolved when a problem occurs.
ARTJET continuously collects and organizes real-world problem data from the field to support faster and more accurate troubleshooting.
🎥 Print Quality Sample
💰 ARTJET Pricing & Sales Conditions
(Note: Exterior design has been updated)
🧾 Full List of Products You Can Make with a UV Printer
* Note: Exterior design has been updated.
핑백: Double Printing in the Y-Axis Direction — Electronic Board / Software Issue (Part 7) ARTJET 2025