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QSS 3300 - Thin sharp lines running horizontal


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Yes, these two thin lines can be seen if:
- the dirt is on the path of a laser beam ( in your case the lines are sharp it means the obstacles are far from the laser)
- the crystals of dried chemicals on the crossovers' or racks' rollers

As it was mentioned above by other forum members - clean the protective glass below laser unit (inspect the surface with a torch-lite) and inspect the rollers for crystals of old chemistry.

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