Question about HP LaserJet 2840 Printer
I have replaced all 3 colors and now I do not know where or how to insert the black cartridge
The carousel rotates when the lid is open. Keep pressing the button till you see the right cartridge.
Posted on Aug 02, 2012
This is an easy one, you do the black the same as each color cartridge. All four cartridges sit on a carousel that rotates.
Just keep pressing the button that's directly underneath the ready light until it says "rotating to black". After the machine stops rotating, open up the cover and put the black cartridge in.
Posted on Dec 19, 2008
Had the same problem but this worked for me. To force a cartridge change, press and hold down the PAPER FEED button for at least 5 seconds as suggested here:
I then changed the black cartridge, even though I hadn't used much ink from the old cartridge and the computer was showing it as three quarters full.
Posted on Apr 22, 2008
Remove the color cartridges. On one end you can see the opaque
ink tank inside the main cart. housing. Cut a piece of black electrical
tape to fit around the three sides visible of the ink tank. Make sure the tape fits inside the housing and adheres to the tank itself. This makes the printer think your ink is always full but you can always tell when you need to refill/replace the ink(right?). Good Luck!
Posted on Dec 27, 2008
Your printer detects ink levels with an optical sensor that shines at the clear plastic in the center of the bottom of the cartridge. Once this area is no longer dark it will tell you to replace the ink. Since you installed full cartridges it could be that the sensor is cracking up. Another possibility is that you could have air in the ink lines that run between your cartridges and the print head. When this happens the printer cannot print the color that has air in the lines. You should be able to look in your printer to see the ink lines and see if there is air in the black one.
Posted on Feb 19, 2010
I see this type of problem almost every day with these PhotoSmart printers. It is something wrong with the cartridge sensor in the printer. About the only thing you can try that sometimes fixes it is to turn off the printer, then physically unplug it from the wall for at least 2 minutes, then replug it back in.
If it still comes up with the error then unfortunately the printer has effectively died..
Posted on Oct 28, 2010
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Posted on Jan 02, 2017
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