My kyocera fs-1370dn suddenly says it is missing a developer unit when the developer unit is there and was just working

No the FK-170U fuser will not work in a printer that is compatible with the FK-150 fuser unit. I found a Kyocera FK-150 Fuser Unit available on Amazon here: https://www.amazon.com/Genuine-Kyocera-FK-150-302H493032-Kyocera/dp/B00GOO57M2 . Other sites have third-party replacements.

The FK-150 fuser is the correct fuser for the FS-1028MFP, FS-1128MFP, FS1350DN, among others. The FK-170U fits the following Kyocera printers: FS-1035 Mfp, FS-1135 Mfp, FS-1370DN and FS-1120D. There are a few other printers. The design changes means they can't be substituted.

I hope this helps.

Cindy Wells

the waste toner is in the drum unit there are 2 covers 1 on each side pull them off and dump the waste toner

empty the drum unit there are 2 covers 1 on each side

the drum unit is full of waste toner empty it by removing drum unit and removing small covers on both sides dump all toner out of unit then reinstall the covers then the drum unit

Hello,
the developer unit for this printer looks like this.

The unit can be found under the toner cartridge.
Here is a link on how to remove the toner cartridge.
okm2000 de Kyocera FS 1370DN 1370 1350 1320 Tonerwechsel Kopierer Drucker...

Best regards,
Marius

Hello,
you will need to check that the developing unit connector is in proper conection with the printer.
Also check that there is no dust or toner resedue on the connector.

Best regards,
Marius.

The developing unit is where the toner sits upon.Remove the toner cartridge and ensure that the developer unit is correctly inserted.Then re-instal the toner cartridge.

Empty the waste toner from the back side of the drum unit. Then remove and reinsert the waste toner sensor connector from the controller assy (main pwb).

Try installing the developer unit.

Generally this printer can be separate into 4 major part: Printer body, Toner container, Developer unit and Drum unit. The developer unit is the unit where the toner container "mount" on it and it should be removed to allow cleaning task every time the toner container is replaced.
U may get this error message if the developer unit is not install properly after u replace a new toner container. Just lift the developer unit together with the toner container out of the printer and then insert back properly into the machine.

YBC (/\)