I've got an HP 4350tn that is repeating an image down the page. I've tried diffenerent toner cartridges from machines that do not have this problem, yet when placed into this machine they start to produce the repeating image. I've also changed out the transfer roller with a new one. Could it be a controller board of some kind? Thanks for your help.
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I am not sure what printer you have here but if you are having repeat images down the page then it more than likely that you have a faulty toner cartridge. Try changing the toner cartridge first.
If that does,nt solve the problem then you have a defective fuser assembly.
I have seen bad laser scanners cause this...
A black line across the page from left to right, of various widths, at various intervals, all the way down the page.
First, though, I would reseat the toner cartridge. If the problem disappears, you are in luck!
Try another Toner Cartridge to see if the problem disappears.
It could also be a bad control board.
Sounds like a bad drum cartridge. Pull the toner/drum cartridge out of the machine and set it down. Press down on a (blue?) tab to release the toner cartridge, and you can lift the toner cartridge out of the drum cartridge. There is a cleaning blade in there - a soft plastic blade that rides against the drum and scrapes off toner that didn't get transferred to the paper. If it gets stuck off the drum surface, images repeat a few inches (one drum circumference) down the page.
A new DR-350 drum unit should fix it. have the machine's power on when replacing it. While the door is open, touch the CLEAR key. The display will read "REPLACE DRUM?" or something like that. Press 1 for Yes.
If it is jjust one color. Replace that toner since the wiper blade is not working. If it any or all colors try taking out the fuser and seeing if the image is laft on it. The fuser is under the top panel.
The problem is likely the fusing assm.
This is the test to determine toner or fuser issue. Print a test page When you hear the paper feed into the machine open the top to stop the machine Remove the toner cart. You should be able to see the page with printing on it. (This is before the page hits the fuser) If you can see the smudge or marks on the page the problem is most likely the cartridge but NOT the fuser. If the page is clean the problem is most likely the fuser.
Hope this helps
I ran the hp toolbox "cleaning" mode too and it did not help the problem at all. I still have a dark smear concentrated in the middle of the page, and ghost images repeated lighter all the way down the page.
Toner and the drum is all one unit it is more likely that toner got onto the transfer roller and some near the fuser unit. Best thing to do is turn the machine off open the cover and remove the toner cartridge.
Then Hoover (vac) the inside with a soft brush and clean out all the loose toner. Once that is finished install toner cartridge a run about fifty sheets through to get rid of any other toner. Suggest installing a new toner cartridge as well.
The comment from Kasmodan2 is true it can the toner cartridge, but is most cases it is the fuser. I repair HP laserjet machines day in and day out to replace the fuser is easy.
Turn power off
Open cover at right hand side rear
Remove data cable
Open top cover remove toner cartridge and press button on right hand side and slide the right hand cover off
Open the back cover and lower the door all the way down
Remove the two silver screws
Take out the paper tray as this will be easier to remove the back cover
Pull the back cover from the bottom and should unclip be careful not to break this cover.
Once open then you will see the fuser unit unplug the connections and remove the screws then slide out the fuser unit
Refit the new fuser unit plug in all the connections and reverse the above process
Turn machine on and test if all good the machine will work fantastic if there is a constant red light repeat above and check connections if still red light then the new fuser faulty and not heating up.