HP 4700 - tones dropping in on transfer kit w/ new toners
When this first appeared - the cyan toner started dropping 'dots/spots" on the pages on the right hand side, then the magenta, then yellow and finally black. we replaced all 4 toners, the transfer kit and the fuser. after 4 days of printing - the brand new cyan has started doing the same thing. what else could be wrong?? any other parts that could be or needed to be changed out.?
Re: HP 4700 - tones dropping in on transfer kit w/ new...
High Voltage Board. The high voltage board is responsible for delivering the static charges which perform two functions within most laser printers: 1) Causes the toner to move from the drum surface to the surface of the intermediate transfer belt(ITB). 2) Causes the toner to move from the surface of the ITB to the paper.
In the CLJ 4700, there is an Electrostatic Transfer Belt instead of an Intermediate Transfer Belt. This simplifies the process by one step, because with an ETB, the paper rides on the belt, instead of having a separate transport path. HVB is still responsible for the colors transferring on to the paper from each drum, and it's literally the only thing left which can still cause copy quality issues if you've already replaced all four drums, the belt, and the fuser.
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First of all it's really not a good idea to swap color positions. However sounds like a transfer belt problem. Try getting a proprietry printer cleaning sheet. This is like a standard size paper sheet that actuall has cleaning properties. Run that through a couple of times and see if that solves the problem. If not you may be looking at a new transfer belt unit.
Try to print clean page , Print a cleaning page
During the printing process, paper, toner,
and dust particles can accumulate inside the printer and can cause print
quality issues such as toner specks or spatter, smears, streaks, lines
or repeating marks.
Follow these steps to clean the printer's paper path.
Load copier-grade paper (not bond, heavy, or rough paper).
On the printer's control panel, touch the Menu
Touch Configure Device
Touch Print Quality
Touch Process Cleaning Page
message appears on the printer control panel display while the cleaning
is taking place. The cleaning process takes a few minutes to complete.
Do not turn the printer off until the cleaning process has finished.
A page will be printed when the task is complete. Discard the page.
You might need to repeat the cleaning
process to thoroughly clean the printer. Print a few more pages to see
if the problem is resolved.
I assume that the Verbatim toner cartridges are a generic brand in which case I suggest that is your main problem.
I have attended many repairs of these printers with the same issue and putting genuine toner cartridges in has resolved the matter in 99% of cases.
Since you have Cyan toner in places where it should not be then the only possible cause is a defective Cyan Toner cartridge. I worked on one just last week where the customer complained about Magenta toner on their prints. I also noticed Magenta toner on the Transfer Belt just as you see Cyan toner on the Transfer Belt. I replaced the Magenta Toner Cartridge and everything cleared up nicely. The Transfer Belt Unit can also cause similar problems but it would not be ONLY one color like Cyan. It would be a mixture of all colors. My bet is replace the Cyan toner and you will be fine. If you have an old empty one just shake it up a bit and try it as well. This might allow you to verify before buying a new cartridge.
Good Luck and Thank You for using Fixya.
Its looks like you have a small pinhole, or divot, on a imaging conponent that is common to all four toner cartridges. Remove the drum unit from the prtr and keeping the green handle close to you pull back the shutter which covers the drum, and look for spots of toner at the either end. If you hold the page with the spots on it, with the leading edge centered and touching the drum, it will give you some idea where the edgeis relative to the end of the drum. If you can't see any corresponding spots on the drum surface.
Put the drum unit back into the prtr and allow the prtr to restart, then switch off and remove drum, this will have turned the drum to a new position, and should show any defects. Only expose the uncovered drum to light for a minute at a time, and avoid touching the surface.
Let me know what you find.
Again, this was actually HP Laserjet 3800. Problem solved by chatting with HP, and them having me go into a diagnosis mode that disabled cartridge check. Then, I removed the cyan cartridge, the dots went away. They then had me put the black into the cyan slot, and not dots appeared. I had backup toner on hand, swapped in a new cyan and magenta, and all was good. HP agreed to replace the cartridges.
First off, this is a comment from a random person who may or may not know ALOT about these printers and toner/printer design in general. All toners are not designed to the same specification. Toner is a combination of plastic "pigment" and iron like shavings to make it magentically attracted to the electrical charges within the unit. Different toners conform to different grades and mainly size of the particles within the blend. The manufacturer doesnt only recommend that you use their toner to make them money, yes of course it makes money, but its because when the unit is designed it is designed to use a certain grade of toner, trust me if you put the non-branded toner vs the branded toner under a microscope you would see quite a difference. Often the non-branded toner is much larger in particle size (obviousely because its cheaper to make at this spec). This causes a variety of issues from excess toner not being cleaned off of developer rollers, IDT rollers, or clogging of toner dispenser tubes in the unit and the micro filters contained at the toner dispenser assy and developer assys. Also as for the issue not changing when switching to dell branded toner - the dispenser tubes within this unit contain up to 500-1000 pages worth of toner, making no change in toner you make immediately visible. Also depending on the damage caused by the previous toner, it may not be able to be fixed until all the components in between the toner and final delivery (drum cart) are replaced. In this case more than likely the toner dispenser assy, all developer assy's, and drum cartridge need to be replaced, and than be sure to stick with factory branded toner :)