The problem
I'm printing labels and on some copies the small text appears slightly doubled, while images and solid areas seem normal. The file is always the same and the problem wasn't visible at the beginning of the run. I don't know if it depends on the file or the machine. What can I check?
Cause and analysis
The doubling of black text could be caused by an asymmetry in the black toner output curves compared to other colors in digital toner printing — if black text is always processed with a slight right offset compared to the file, the defect would remain stable but difficult to observe visually until the contrast with the background makes it clearly evident.
A possible cause is asymmetrical wear or misalignment of the black toner fusion and transport system during the printing phase — black toner could undergo a slight deviation in the fixing path, different from that of other colors passing through the multicolor carriage.
Solution proposed by GPX
A possible cause is the misalignment of the black toner output system (fusion, transport, or rear compression) relative to the path specified by the file — in digital toner printing, each color follows an independent path and black is often applied last or with specific fixing pressure.
Limitations of this analysis
This analysis is generated with the support of Artificial Intelligence: always verify its correctness and applicability before using it. The reliability level of this analysis is "Medium", not the highest possible.