Question about HP LaserJet 4700 Printer

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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.?


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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.

Posted on Mar 15, 2013

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Re: HP 4700 - tones dropping in on transfer kit w/ new toners - HP LaserJet 4700 Printer Printers & Copiers

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Posted on Oct 30, 2007

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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.

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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.
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Excess cyan toner is on electrostatic transfer sheet even after wiping it. All black and white pages are printed with cyan background.I am even using original cartridges.

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.
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Rev. Gregory.
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.
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