When a machine that marked perfectly for a year starts producing faint marks, the source is rarely at fault. In our service calls the cause is a contaminated lens or window nine times out of ten.
Daily
- Inspect the protective window with a torch at an angle. Any haze or spatter — clean it.
- Wipe with a lint-free tissue and isopropyl alcohol, from centre outward, once.
Weekly
- Clean the F-theta lens the same way. Never use compressed shop air (oil mist).
- Check the focus reference block; re-set Z if the mark line has drifted.
Monthly
- Run a power ramp test on a steel plate and photograph it. Compare with last month.
- Check fibre cable bends — nothing under 200 mm radius.
If cleaning does not restore contrast, call support with the ramp-test photo; we can usually diagnose remotely.
