Installed the black imaging unit in konica bizhub c350 but it shows install the imaging unit correctly and close door???? why and if i take out and install the old one the message dissappears and put in new one same message comes again

Are you using a 3rd party image unit???, if so get OEM there are chips on them that copier monitors. The image units are the units below the toner cart. which one is having the problem Y M C or Black, did you re chip them, bad idea. Replace them with OEM cartridge.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

are these third party?????? if so get OEM cartridge the chip may be bad, mite try cleaning chip contacts with ispololy alcchol

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

replace the cyan image unit with OEM unit

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Sometimes just open the doors and closing them a few times will work its sensing somethings open ,Make sure all is closed you may have too reinstall drivers. start over read all directions sometimes we get burnt out on trying to get something going give it a break for a bit then try again. could be a firewall or anti virus cause problems to.

open front door then push the IU correctly then close the door and close the side door from your right side...

bizhub c350 is not installed properly, the driver you are using are the correct drivers.

Have you open closed the front door to clear code? have you replaced the black image unit? Not the black toner but the image unit Black.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

How to clear a fuser error code (C0500, C0501, C0510, C0511, C0520, C0521).Solution To clear the fuser error code, perform the following after correcting the cause:
1. With power ON, open the front door and locate the small, rectangular hole below the imaging unit removal tool.
2. Insert a suitable object into the hole to actuate the reset switch .3. The code should clear and a message to close the front door should appear.

using a post:
1. With power ON, open the front door and locate the small, rectangular hole below the imaging unit removal tool.

2. Insert a suitable object into the hole to actuate the reset switch .
3. The code should clear and a message to close the front door should appear.
So all settings are RESET.
thanks for krishmaqvan

tis error means abnormal tonder density in the balck image unit take the blacke image unit out and shake it while holding it level and put it back in the machine to reset the error code leave the machine on and open then close the front door