SOURCE: lexmark laser printer leaving a white streak 2-3
take a q-tip and clean the scanner window. this is located in a 3/16' opening on the roof of the printer cavity it will be about 8inchs long. pull the toner cartridge and feel with your fingers on the roof of the cavity this will be located above the transfer roller slightly towards the front of the printer. white lines like this mean the laser is being blocked usually by a bit of toner or other dirt of some kind
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