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fuser drum is bad. photocopier use electricity to transfer the toner to the paper, then it is heat fused to paper. it appears that the problem is occurring around the time that the toner is attracted to the paper.
Could be optics needing to be cleaned. First I would rule out the toner cartridge. If you have a spare swap it out or remove your current cartridge, turn it over and slide open the "gate" that covers the drum cyclinder. The drum should be clean all the way across it's surface. If you see toner on each end then that is where your dark sides are coming from. If the drum is clean then most likely you have dust building up on the optics mirrors. One test for this is to manually lighten the exposure control on the operation panel and then recheck your copy quality. This may cause the rest of the copy to be light but if the dark sides goes away then your optics are dirty.
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Check the toner cart and the drum is it old/new is the toner cart properly installed. Is the LASER glass clean it should be protect by a cover ensure machine is off when checking and cleaning the LASER **** glass. Also check if you can print out a machine developed document such toner/pages printed document to see if this problem is related to the scanner or the drum/toner/LASER, if these document print out clan then the problem is with the scanner
the nealy black copies sounds like the drum is going, try adjusting the exposure to light, if it comes out with the whole page the same way but just lighter than change drum. White line sounds like there is something on the coronas.
There are no fiber optics in the copier. It has 6 mirrors that send the image to the drum unit. Did you try to clean the copyboard glass? Also, do the marks move up and down the page? Also, have you replaced the drum cartridge recently? Pull the drum unit out can you see track marks on the drum it self. If not I would have to say it may be comming from the fixing ass'y, the hot part of the copier. Try to use a dry rag and wipe up any loose toner in the paper path then try to run some blank pages in the copier this may clear up the problem...
You could have a broken exposure lamp. Does the scan bar light up when you make a copy? If not that is the problem. You might also ck the contacts on the machine where they touch the toner cartridge. The toner cartridge opens a shutter to the drum when you slid it into the machine and that may be broken.