Question about HP LaserJet 2840 All-In-One Printer

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We have a laserjet 2840. When I added the new black toner cartridge and it was cycling the machine stopped in cleaning mode and now it seems like the catridges are jammed. It just says incorrect yellow but the wheel is stuck between yellow and magenta and it wont turn. Is there some way to manually fix this????

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  • 56 Answers

There is. Its actually simple but difficult to explain. I try my best.
1. open the top cover
2.you will see the two plastic hinges that hold the top cover.
3. look at the right one, you will see that it gets inside the unit, just below that plastic hinge (inside) there is a white or gray plastic part with an square hole (in rare cases might be black)
4. Introduce a thing object (an open paper clip its perfect) DO NOT FORCE THAT PART TOO MUCH AS IT CAN BREAK

This steps will unlock the carousel and will move free. You can manually rotate it and take everything out. Finally take the clip out and the carousel will lock again. Try to insert the toner as you normaly do.

Posted on Sep 08, 2010

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1 Answer

How to reset supplies on HP 2840 laserjet?


"Would like report of supplies from 2840 laserjet. How to get it to show report"

Select 'Menu" button, then select "Reports", then select "Supplies Report".

This will print the status of the four toner cartridges and the drum.

It doesn't make sense to reset toner cartridges UNLESS you refill them
first. On the HP 2840 each cartridge/drum contains a chip that measures
the life of the unit.

You can purchase toner/chip combinations online cheaper than new
cartridges. I also purchase drum chips to extend the use of my drum
until print quality actually starts to deteriorate.

I use both of these methods to save money on supplies - buy toner and
toner chips, buy drum chip to get full use of drum unit.

Hope this helps.

Mar 19, 2012 | HP LaserJet 2840 Printer

1 Answer

We have an HP Color Laserjet 2840 printer in our office. We were low on our black ink drum, bought a new drum and installed it. Copies are coming out perfectly but the "replace black...


The 2840 is a slightly different sort of machine when it comes to supplies. There is a main imaging drum unit which works for all four colors, and then there of course are the 4 colors. If the unit was asking for a drum unit then you should have instaled a Q3964A. It is entirely possible that your drum unit and black cartridge both expired at the same time, in which case, you need a black toner cartridge now.

Jul 28, 2011 | HP LaserJet 2840 All-In-One Printer

1 Answer

How can I override the calibrating mode on A HP LaserJet 2840 All-In-One printer. My black toner is out and it would not print any documents, keep saying replace toner can I override this until I purchase...


You Cannot override, as the black cartridge is required for all print functions. Both B/w and Color use the black, obviously in smaller amounts in color, but it still requires it none the less. Sorry, I know you were hoping to trick the printer somehow, but with HP printers it's not an option, especially on the Laser Printer models like yours.

Dec 15, 2010 | HP LaserJet 2840 All-In-One Printer

1 Answer

Hp laserjet does not recognize black ink


This is a problem with a faulty chip on the black toner cartridge. Happens alot when using generic brand toner cartridges. You need to replace the cartridge.

Mar 25, 2010 | HP LaserJet 2840 Printer

1 Answer

Streak down the center of the page


The streak is most likely the toner or the fuser

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 or front 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 defect on the page the problem is most likely the toner cartridge but NOT the fuser.
If the page is clean the problem is most likely the fuser.
Hope this helps

Mar 25, 2009 | HP LaserJet 2840 All-In-One Printer

1 Answer

HP 2840, black ink drum q3964a


Hello, these printers tend to be finicky.

In other words, just replace the black toner. When the printer says its low, or empty, regardless of wether or not it is, just replace it.

Replacing the drum, when it says black toner needs to be replaced will do nothing to rectify the issue.

Buy only HP Toner and Drum cartridges for this printer. Do not try to refill toner cartridges, and do not reset drum. You will only end up destroying your printer in the process.

Feb 26, 2009 | HP LaserJet 2840 All-In-One Printer

2 Answers

Re-installing yellow cartridge in HP 2840


There is a gray button right of the LCD display that has a black arrow circling clockwise and four color dots (magenta/black/cyan/yellow). Push it until you see the "Rotating to Yellow" in the LCD display, then open up the top of the printer by pushing the big gray latch next to the picture card reader at the right front of the printer. You now have access to the cartridge. pull it out and examine it. If it is a new cartridge, check to see if you pulled the plastic dam strip out (which keeps the toner in place in shipment etc).

Sep 07, 2008 | HP LaserJet 2840 Printer

1 Answer

Replace Cathridge


The front panel tells you witch toner cartridge should you replace. If a supply memory error ocures then the cartridge should be replaced or exchanged with a new one. The imaging drum unit is also consumable. for "Joe 50" - there are 4 toner cartridges in the printer.

Dec 28, 2007 | HP LaserJet 2840 Printer

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