Missing lines or white streaks
Usually thermal printhead damage, dead dots, contamination, or uneven contact across the label. A few cases clean off. The rest need replacement.
Vol. 01 · 2026 Thermal & inkjet diagnostics Issue 01
Cover · No. 01
Is your printhead the problem?
Missing lines, faded prints, streaks, dead dots, banding, scan failures. Most of these trace back to the printhead. Not all. We help you tell which is which, and what to do about it.
01 Run the diagnostic01 · Thermal symptoms
Fig. 01 Missing-line pattern 300 dpi · Plate K
What you're seeing on your thermal printer
Faded or low-density labels
Heat settings, ribbon or media mismatch, or a printhead wearing out. Easy to confuse with a thermal-transfer ribbon issue.
Barcode scan failures
Often blamed on the barcode itself. Weak edge definition and recurring defects usually trace back to the printhead.
A dead column on every label
The clearest sign of printhead failure. Once a thermal head loses dots, they don't come back. Replace it.
02 · Inkjet symptoms
Fig. 02 Horizontal banding 1200 dpi · Plate C
What you're seeing on your inkjet printer
Banding or horizontal stripes
Partially clogged nozzles, a misaligned head, or low ink. A few cleaning cycles fix many cases. Persistent banding usually means head replacement.
Missing colors or color shifts
Clogged nozzles or a failed channel on the printhead. If cleaning cycles don't restore color after a few tries, the head is the issue.
Faded photos or thin text
Low ink, wrong paper setting, nozzle clogs, or a printhead at end of life. Easy to mistake for an ink problem when it's actually the head.
Streaks or smudges across pages
Encoder strip dirt, ink contamination, or printhead damage. Usually starts as a maintenance issue and ends as a replacement decision.
In development
A diagnostic tool trained on real printhead failures
Upload a photo of a bad print. Get the failure mode, the likely cause, and the right replacement part. We're building it on thousands of real-world examples across thermal and inkjet printers, so the answers come from how heads actually fail in the field, not generic advice.
Until it ships, the symptom guides above are the fastest way to figure out what you're dealing with. Try the preview diagnostic to narrow your symptoms in three steps.
Try the preview →FAQ
What is a printhead problem?
Any print quality issue caused by the printhead: streaks, missing output, dead dots, color dropouts, faded labels, or unreadable barcodes.
Does every issue mean replacement?
No. Some come down to settings, ribbon or media mismatch, or nozzle cleaning. Others are real printhead wear. The symptom guides above will tell you which side you're on.
Does this cover my printer?
Thermal label and barcode printers (Zebra, Sato, Honeywell, Datamax, TSC) and desktop inkjet (HP, Canon, Epson, Brother). Model-specific pages are being added.