Question about Xerox Phaser 7750DN Laser Printer

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Can I just recharge my "Developer Housing Unit", or do I need to replace the whole thing? I found whereyou can buy the "recharger powder" for $85 but the complete developer housing unit is around $300

Let me explain my entire scenario.... My printer stopped working because it said on my LCD screen.... (ATC Cyan sensor..error code 14) I recently searched and found the service manual for my xerox 7750DN printer and it says to access the "Service Diagnostics" mode which I did and reset the error code. This allowed me to once again be able print with the printer but my Cyan is still messed up. The manual says to change the Engine Control Board or....change the Engine Control Board and the developer housing unit. I've changed the engine control board (at a very high cost...arrrgggg) and the cyan is still printing blotchy/messed up.

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Yes you can "recharge" the developer. It involves removing the cyan developer assembly and replacing the cyan developer powder.

Posted on Apr 14, 2017

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Loud toner error


The machine does not use the toner directly from the bottle, it goes thorught a developer chamber filled with developer powder. Then the toner is charged and can "jump" over to the latent image of the drum.
In this developer chamber, there are some small gears (2-3 tiny gears) that may be worn out. Some developer may have entered the "gearbox", and the deveoper powder is very abrasive.
The teeth of the gears will eventually stop to contact and mesh up. The internal parts of the developer changer stops to revolve, and there is no toner mixed with the developer.
You can see that there is a build up of toner, but it does not enter the developer unit. These gears have to be replaced, and I allways change the developer powder at the same time.



mp 2000 developer gears-2rhlv5r3sdqqpeuzs0ozcjtp-5-0.jpg These gears must be replaced it they are worn. The image shows a brand new part that contains the gears.



mp2000 developer toner input side-2rhlv5r3sdqqpeuzs0ozcjtp-5-1.jpg This is the side of the developer unit where toner enters the developer unit. With defective gears, the developer unit can not pull toner inside of the unit, and the toner builds up in front of the unit.

The gears are cheap, but will often result in the need of new developer powder - and that is expensive.
If print quality does not have to be too good, one can use the old powder and save money. Some of the powder is lost during use, and leaks. There may be some dust in the developer too.
In order to get high quality several parts may need to be replaced.

It is quick and easy to change these gears, just a bit dirty job.

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Tip

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It's very easy to mistake where and how to replace toner on this unit. It's often assumed that Area 1 is where the toner is. This is actually the Developer Housing. If the developer unit is pulled completely from the copier, its weight will often surprise the user and they drop it on the floor, or worse, dump out the developer believing that it's waste toner. The correct area for the toner cartridge is Area 2. Area 1 is used only to lower the developer unit and unlock it from the toner cartridge, so that the cartridge, itself, can then be removed freely from the copier. If the developer unit is mistakenly pulled and dropped or dumped, a service call will usually be required to recharge the developer unit.

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That sensor is located in the developer housing. You can either replace the sensor, or replace the developer housing, which comes with the sensor. Either way, you will need to go into diagnostics and set the value of the new ATC sensor after replacement. (You will need to replace the developer powder if you get a new developer housing)

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I have the complete 9 page instructions with images if you want I can e-mail them to you. Here is a snippet explaining just the portion of the beads. (email me at itsallnoise2me@gmail.com for complete instructions). Also, if you purchase the developer beads from iteminc.com they will include the instructions " 1. Place the developer housing assembly (new or used) to be recharged on a drop cloth. Caution During this procedure, the developer housing assembly must be kept level at all times. To prevent toner spillage, it is recommended that the developer housing assembly be fully supported level by laying it on something like a large piece of cloth, paper towels or styrofoam hollowed out for the developer housing assembly to lie on. If new, remove the protective cover over the magnetic roller. Do not touch the magnetic roller. Note The wires are routed under and behind the right snap tab. 2. Release the snap tabs at each end of the developer housing assembly and remove the assembly cover. 3. Agitate the package of developer mix and then cut it open. Carefully pour the entire contents of developer mix as evenly as possible over the two augers. Do not let the developer mix accumulate heavily on the roller. Keep the developer housing assembly level. 4. Reinstall the cover making sure that the rear tabs are all engaged in their respective slots while positioning the wire harness under the snap tab. Press firmly until you hear a positive "snap" sound for each tab indicating each snap tab is securely fastened. 5. Tear off the ATC sensor perforated tag. Do NOT remove the ATC sensor label from the developer housing.Peel off the protective backing, and adhere the label to the appropriate or corresponding Imaging Unit Plate. Make sure the ATC sensor tag label can be located if needed later. 6. Record the number for entering into NVRAM in the next step. 7. Perform the ATC Sensor Setup procedure."

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