The prints are evenly crossed (RICOH 901s)

Currently I am using a ricoh 901s printer, when prints are printed with evenly spaced strips, is this problem related to laser unit? If I replace the laser unit, what parameters do I need to enter because I do not have these parameters, I'm looking forward to detailed instructions, thank you very much,
Please see the image below

 

Looks like "line raster". Can't you change the raster type or lpi?

 

You can only change toner dither back to a dot matrix.
Although, unless someone changed in to line screen, that may not be the issue.

Changing of the laser is one service i've never performed, so I can't help much there

I assume the drums and transfer belt are in good shape?