Green lines

[yohon]

Hi, is anyone familiar with this fault? Where might the problem be? Thanks.

[PHOTOLABPART.COM]

Respected Sir 

Please inform about Machine model,

Any error there? 

 

Thanks 

[yohon]

Hello, the model is the Qss3203. It doesn't display any error messages; the lines appear on some prints, but not all of them.