Shart AR BC 260

This is likely due to the drum units being worn out. They were on mine. Once I replaced them the machine was back to perfect photo finish copies and prints. To change out the drum units, first remove the toner cartridges. Next, open the left sliding tray all the way open. This exposes the fuser unit but it doesn't matter because all you have to do is open the side door and slide it out all the way. Next, remove the green screw located at the bottom on each drum unit. This immediately releases the unit and you can pull it straight out. Reinstalling them is the same thing in reverse. I hope this is helpful to those of you who agree that Sharp is not being very cool about allowing the user to work on their own machine, since they don't provide any solutions regarding the drums...Tom

Please clean the mirrors and drum unit

Try cleaning the little glass strip on the left side of the main glass (that serves documents sent through the feeder), or take off the glass and wipe the dust off the mirrors.

Are the lines actually red or blue, or are you not useing your school taught technical terms, of cyan or magenta. Rookies tend to not describe properly as being old school color training we were forbidden to use red as magenta or blue as cyan. IF the lines are in rotation to the drum, you may have bias short or bad drum which gives the affect but basically on the cyan or magenta color, if its red or blue the problem may be further in process. Hard to answer the question wyh such little description.

I think this model has led's above the drum unit which write the image onto the drum if you remove the toner/dev and drum unit you can clean them with clean soft cloth
if lines are across page the toner cartridge may need replacing or if machine is old the connector at the back of the toner unit that turns it can be worn and slipping replace them
also clean optics and glass as well
drums may also be worn if you can see metal near to the edges replace drums

Also you can clean the the drums with alcohol and soft towel rub softly.

Replace the toners send old ones back to dealers for credit sharp knows the have a problem.