Please check to see if your CLJ3550 is on the latest firmware version, if not, upgrade it, it may fix the problem just like the CLJ9500mfp
This might be a non-HP toner (although i doubt it) since the error indicates that the supply memory chip was not found at all.The chip might also be deffected.
This are the steps offered by the service manual:
1. Open and close the front door.
2. Ensure the cartridges are fully seated.
3. Swap the cartridge for the color
indicated with a cartridge in another
slot to determine whether the error
follows the cartridge or stays with the
slot. If the error follows the cartridge,
replace that cartridge, otherwise,
continue with step 4.
4. Check the memory controller PCB
contacts to the memory tag. Clean if
dirty.
5. Reseat the memory controller PCB
connector J201 and DC controller PCB
connector J1025.
6. Defective memory controller PCB,
replace the memory controller PCB.
7. Defective DC controller PCB, replace
the DC controller PCB
Good luck,im sure that replacing the toner will solve it.
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