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Your problem isn't too hard to fix. If you have a vertical line down the page chances are that your heat unit roller is either scratched and so can't fuse the image in that section or has something on it. This is a bit tricky to fix yourself as your supposed to have a tech guy take the heat fuser unit out. You can do it yourself but have to be confident that you can put it back together. Take care it's usually very hot. This printer often reports a jam in the back paper loaders if a page doesn't grab properly (or you quickly remove a sheet just before it grabs to print). Simply open the back door and shut again. If this doesn't solve it chances are there is something stuck in there. Hope this helps
The four coloured dots are what is known in the trade as "Traffic Lights". They happen when the photocuductor (PCU) drum gets scratched. If you do a black only print you will only get a black dot, if you do a print with some colour in it you will get all four dots repeated at 150.41mm (PCU drum circumference) intervals. The best answer would be to replace the PCU but it is expensive. The alternative is to take out the PCU, find the scratch and try to polish it out with a very soft cloth. This will only work on the lightest of scratches. Be very careful not to scratch the drum further and avoid shining any bright light on it as it will damage the photo-sensitive surface (normal ambient light is OK).
When printing, as thepaper is being transported up the printer, try pressing the right door panel of the printer firmly with your hand. If the colours are much improved then the printer requires a new Transfer roller.
1. Open the Right Door.
2. Remove the Transfer Roller while opening the shaft holder (white color) levers found at the left and right shaft ends of the Transfer Roller to unlock it. Lift out the roller.
It sounds as though a cartridge is faulty.
To determine which one, the easiest way is to run a page of text/block of colour through in yellow then cyan then magenta. which ever page comes out with the streaks on it will tell you which cartyridge to ditch and replace.
Hope this helps