Documax A3300 printer prints in one place

If the print out appears to have random black rectangles - the cause is the print head jamming due to a lack of lubrication.

Yes - I know there is a label that says - DO NOT OIL - THIS UNIT PERMANENTLY LUBRICATED - OILING VOIDS WARRANTY - ignore it, or if your printer is under warranty, get it serviced under warranty.

1) Unload the paper.
2) Switch the printer off, open the lid & remove the ribbon.
3) Remove the two screws that hold the front cover and remove it - the control panel cables are long enough to allow it to be moved to the right and rested.
4) Find the two carriage guide rails - usually shiny rods that run from left to right - and support the print head carriage.
5) Wipe the dirt and old lubricant off of the guide rails and add a few drops of light oil - gun oil, sewing machine oil or similar - slide the print head carriage left/right a few times to spread the oil, wipe clean and re-oil
6) Reassemble the printer.

After years of heavy use the rubber rollers which transport the paper through the printer can get a shine to them and tend to loose their grip. This causes misfeeds and blockages.

Using a damp cloth and something like Jif (slightly abrasive kitchen/bathroom cleaner) rub the rollers whilst rotating them by hand. With a clean damp cloth remove any cleaner and you should see the rubber has lost it's sheen.

Some rollers can be hard to get at but a little patience pays off. I've reclaimed dozens of printers due to be scrapped in this way.

You can also try turning the printer upside down and softly tapping it. You could be surprised at what drops out. My best to date was pieces of an illegal plant substance and a rare Chinese coin. (Yes it was returned to the owner :-)

BMW