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- HP Community
- Printers
- Printing Errors or Lights & Stuck Print Jobs
- Imaging unit is not installed

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07-29-2020 01:39 AM
Hi!
I have a Laserjet M436 printer and yesterday I replaced the drum kit step by step as in the guide has been written. (I filled the developer with beads and replaced the drum unit.) When I was done I got an error message:
Imaging unit is not installed.
I removed and put it back the unit many times but nothing.
I removed the power cable from the printer for a time, nothing.
I know the Tech menu. There is a Maintenance Counts where I can clear the counts. But need a passcode what I don't know.
Is this procedure can be a solution?
Or what should I do?
Thanks!
Robert
07-29-2020 05:28 AM
The truth is, firstly I wanted to buy just developer beads, because the counter now is only about 27.000. But the beads in the developer was almost empty. I dont know why... But unfortunately I can buy only drum kit. So first time I only filled in the developer with beads and I put it back the old imaging unit. In this case I got error message and I replaced the imaging unit with the new one. But the result is the same...