HP Color LaserJet 2840
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Fuser errors are 50.XX 59.4 is the fuser motor. http://www.fixyourownprinter.com/posts/67008

How to Identify and Fix Common printer Problems ?

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A 59.4 error message on HP LaserJets 4250, 4300, and the 4350 is a toner motor rotation error. This error is usually caused by toner that is constrained inside the toner cartridge. In most cases, the solution for this error is to simply replace the toner cartridge with a new one.
Error code 59.40 for HP Laserjet 4350 means that your printer has a print cartridge motor error. The actions you can do to fix this error are: 1 Turn the printer off and then on. 2 Replace the print cartridge.
This error is specifically related to the fuser drive motor itself. The manual states that it`s a “fuser motor start up error“.
F0 Error and is unable to print. This error is primarily caused by one of the following conditions: A transfer alienation failure in which the ITB is stuck and unable to properly engage the internal transfer rollers. The SR9 sensor (the primary transfer roller disengagement sensor) has gone bad.
The 59. F0 Error can be eliminated by resetting the toner and the fuser assembly. You may also try revitalizing your HP device. In addition, you can check for any issue in the fuser motor as well as the internal motor.
Description: This error is primarily caused by a transfer alienation failure in which the ITB is stuck and unable to rotate, the SR9 sensor (the primary transfer roller disengagement sensor) has gone bad or the fuser drive assembly has failed.
Check for excessive wear on gears in Main Drive Assembly

An issue was identified with the material in one of the gears in the Main Drive Assembly for some of the early production units. This issue would cause excessive wear on the gear that eventually results in a 59.0C/59.00. C0 error.

A 59 error is a motor issue of some sort. Could be as simple as a bad cartridge causing the drum motor to lock up. If you find the information provided useful or solves your problems, help other users find the solution easier by giving kudos and marking my post as an accepted solution.
59.10 is a main drive error, which could be a bound up fuser. 51.10 is a laser error, which could be a bad laser unit. Which error do you have? If the printer can print an engine test, then you may have a bad formatter.
This is a main motor startup error. In other words when the motor is supposed to turn it can not and gives the error. I have seen this with other printers and sometimes it is not the motor that is the issue.
59 error including loud noise followed with a poor print quality and toner cartridge coming out of its position, and/or toner access door starts to open by itself. Source of all above-mentioned symptoms is a bent metal ( U shaped) shaft that is used to lock toner cartridge in position for printing.
The 59. F0 error is typically the result of a small sensor switch inside the ITB (Intermediate Transfer Belt) assembly that is not working correctly. It will have variable amounts of resistance as it is activated during the course of operation and causes the error.
The 59. F0 has been a common error code on the HP CLJ M452 and M377 / M477 MFP models. The printers service manual references this error to a “drum motor assembly” but in most cases has been resolved by replacing the Transfer Belt assembly (RM2-6454).
59.70 is a black developer motor failure. If unit is still under warranty contact tech support and get it repaired. If unit is out of warranty you will need a developer motor RM2–7344–000CN.
The drive system the motor drives may be too tight causing an over current state in the motor. Use the feed motor (M101) drive test in the Component test to verify that the motor is not working.
Now you can reset the New Transfer Kit setting … At the control Panel, press the Home button. Open the “Administration” menu, then choose “Manage Supplies”. Select the “Rest Supplies” option, and then choose “New Transfer Kit.” Use the Down Arrow button to highlight the word “Yes”, and then press Ok to select it.
An Er/02 error message indicates that the toner cartridge door is open or not closed completely. To resolve the error, open the toner cartridge door, and then close it completely.
The flag located right of the pick-up roller has a fixed position. If the flag becomes stuck or broken, it will produce a 60.02 tray lift error or a “LOAD PAPER” message.
This typically means the toner cartridge is binding up internally. Remove the black toner cartridge and look at the right end of it to find a couple of white plastic triangular pieces sticking out.
To override HP ink cartridge error, remove and reinstall the indicated cartridge 2-3 times until it firmly seats in the slot. Then turn off the printer and remove all cartridges. Gently, with a dry lint-free cloth, wipe the contacts on the cartridge and carriage to remove any dirt or residue.
The 59.05 errors are related to main motor and toner cartridge. In many cases the drum unit in the cartridge does not rotate and replacing the defective cartridge will resolve the error. You can test the motor by going to diagnostics and running the motor test without a cartridge installed.
US6463248B1 – Intermediate transfer belt providing high transfer efficiency of toner images to a transfuse member – Google Patents.
In some cases, solving the malfunction code is as simple as removing and cleaning the filter on your unit, or unplugging the unit for a few minutes and plugging it back in. The malfunction code F0 means your dehumidifier is low on refrigerant, typically caused by a leak in the enclosed refrigerant system.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

HP 2840 displays: "59.4 error – please turn off/on again" when trying to print/copy pages.
ANSWER : Fuser errors are 50.XX 59.4 is the fuser motor. http://www.fixyourownprinter.com/posts/67008

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error 59.99 turn off then turn on
ANSWER : Read this forum thread http://www.fixyourownprinter.com/posts/51164

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ANSWER : Hey friends.

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error 49 turn off and turn on
ANSWER : The 49 error can be caused by a few things — the firmware needing to be updated or a print job (some versions of pdf files) that the printer doesn’t know how to print.

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HP Color Laserjet blank pages – only jetdirect page
ANSWER : What about the engine test? To do that, drop down the front tray. Feel around on the left side at the top and you’ll feel a little plastic dongle. If you lift up on that it will initiate an engine test page. That will be a page containing lines of each color.

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ANSWER : rgtr

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HP LaserJet 2200D won't print configuration page
ANSWER : Find someone with a HP LaserJet 4100 and you can configure the card to the IP you want:

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Prints blank pages, won't print from computer
ANSWER : Don’t know why you replaced the fuser, but assuming you had print before, then it must have been something you did during the procedure. Only thing I can suggest is to recheck your work. Just because you reinstalled a connector doesn’t mean that it is seated firmly enough to work. Any flat ribbon connectors that you removed and reinstalled, check to see that the contacts are all flat and not peeled back.

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HP Color LaserJet 2840