A grinding noise and paper jamming at the fuser in a Hewlett Packard LaserJet 5 is more than likely caused by the drive train gear cluster.
Image ghosting (image repeating itself down the page) on a Hewlett Packard Color LaserJet 2600 when first switched on or after it has been idle for several hours can be cured by a simple firmware update.
If your Hewlett Packard Color LaserJet 2600 or 2605 prints the red (magenta) faint or not at all, the laser scanner assy needs to be stripped out of the printer and cleaned.
If your Hewlett Packard Color LaserJet 2500 Attention light flashes after every page and you have to press the Go button to continue, you need to check the size of the paper in the paper tray and the size of the paper set in the printer properties.
If these are the same, print out a config [...]
HP Color LaserJet 2605 – colors out of alignment.
The symptons of this fault is that the colours appear to be out of alignment. If you look closely at a printout, you will see it is actually the black that is shifted horizontally and the other colours are ok.
If you turn your Oki C5300 printer on and get the following error message on the control panel display:
SERVICE CALL
020:FATAL ERROR
The firmware DIMM is faulty. This is quite a common fault with this printer and is easy to repair.
If you get a grinding and knocking noise from a HP LaserJet 4250 or 4350, the problem is the swing plate assembly and / or fuser. The swing plate assembly is a metal bracket with two plastic gears on it and drives the fuser.
This is a common fault with the HP LaserJet P3005. When you turn the printer on, it will hang either at the memory count or with the HP logo on the control panel display. It might also have a blank display or show a DIMM error.
This was an interesting fault. The paper fed normally from tray 1, the multi-purpose tray at the front. When trying to feed from cassette tray 2, the printer would run for about one minute and fifteen seconds before the paper was picked up and fed into the printer. It took around five or six seconds to pick the paper up from tray 1.