LaserJet 2420dn: LaserJet 2420dn - install black cartridge

Hello!

I replaced the cartridge in a LaserJet 2420dn, and the printer seems to recognize the replacement cartridge, but after a bit, a message is displayed on the control screen, "install black cartridge". At first, I tried to install a used cartridge (not worn), which had been installed in a 2430dtn. Then, I tried a new cartridge with the same result.

With a quick search, I found the following recommendation for this problem:

  • Remove the left cover and inspect lever of Earth.
  • Reinstall the grounding contact lever hinge on chassis and attach it to the chassis using a cable tie.

I removed the left cover on the 2420dn and ground contact lever / the Assembly seems to be in order. I also removed the left cover on the 2430dtn in comparison. With the left cover removed, I removed and installed several different cartridges and observed ground contact - he seems to bring a strong connection to one of the installed cartridges.

If I re - install the cartridge originally installed (has little remaining life), the cartridge is correctly recognized and I can print. All other cartridges I tried to cause the message "install the black print cartridge.

The 2420dn has available, latest firmware 08_120_4.

A few questions:

Any ideas what can cause this and what is a good troubleshooting step or eliminate sources of problem?

When a cartridge is installed on a printer, the printer stores whatever it is in the memory of the cartridge that can "lock" on the specific printer cartridge? I've never heard of this and I don't really think that's what is going on here (I also tried a new cartridge), but had to ask... :-)

Thank you!

davidzuts wrote:

Have you tried a new OEM toner cartridge... If all else fails and you have the option to keep the printer even when the toner reads as empty, then simply move the chip of the old toner which seems to work correctly in a new toner and see if the new toner works now...

I tried a cartridge oem HP brand new (Q6511x). I had to break the plastic tab and remove the plastic "Ribbon". I also moved the the cartridge chip non - oem (almost worn) who has always worked, to the oem cartridge. This made no difference - oem new cartridge still does not work. I've already tried several cartridges, including a new non - oem MICR cartridge. Just by Visual inspection non - oem and oem cartridges, I am baffled why one works and the other does not. The cartridges look almost identical structurally. As previously stated, I have observed several installed cartridges with the left cover is removed and the contact of the ground seems to be a solid connection for each cartridge.

After application of a cable tie fix, I tested the new cartridge oem with its original chip, with success. I used the quantity 3, clamps "Garland". For anyone else similar/identical symptoms, I do no guarantee that it is the best way to implement a fix of cable tie or that this will solve the problems you are having. But I hope that someone finds it useful. See the photos below.

Tags: HP Printers

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