The service manual is really great - thanks to it I was able to install the laser unit and thus "save" my CD-player, which seemed to be impossible before I had the manual.
Complete manual as pdf-file in very good quality. Very helpful and fast availability.
Text excerpt from page 293 (click to view)
Thin Vertical White Lines/Stripes
All Printers � The toner cartridge is defective or nearly empty. � Gently shake the toner cartridge and reseat. If the error persists, replace the toner cartridge. � � Foreign obstacles are in the path of the laser beam. � Check the laser beam shutter. The printer needs to be cleaned.
5Si/5 � � The focusing lenses in the scanner assembly may be dirty. The beam-to-drum mirror is contaminated.
2686A, 2686D � � � The fuser cleaning pad is dirty. The transfer corona wire is dirty. The laser/scanner assembly is defective.
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II, IID, III, IIID � � � The transfer corona is dirty or worn. The beam-to-drum mirror is dirty. The laser/scanner assembly is defective.