HP Managed MFP E77830 error code install yellow error

[LoendranM]

Hi

I recently bough a pre owned HP MFP Mamaged E77830

I bought it with error 63.00.3d (magenta toner), I shook the toner, cleans the pipe to the drum. Error fixed

Then it 63.00.6f came up (cyan toner)

So I cleaned the balance of the 3 toners and errors were gone

Now it shows "install yellow drum", but the drum is installed

I swooped the black and yellow drum, to test if its the drum or the printer, but it still says insert yellow drum

My question is

1. How can I fix it?

2. Is the printer the problem?

3. Should I replace the yellow drum? 

[LoendranM · Accepted solution]

SOLVED

There was a piece of paper jammed in the ethernet port at the back of the drum, I removed that and problem solved