Dear friends

I have a customer typographer with TOSHIBA studio 5506AC, when he print solid color has lines parallel in feeding direction .. (test mode 04-237 in all colors have lines)
The machine have 250.000 color prints but he use thick 4 (300grm)
I clean developer units , main charger , laser slits…
The transfer belt have lines (no toner lines) , but I believe all transfer belts have lines..

Can you help me please?pic1.jpgpic2.jpg