I have a Kyocera 4000 printer and I am getting an error message: call service 7410:0085450

SOURCE: call for service error 7410:0112053 on Kyocera FS3900 DN

most likely the drum popped out.
open the left side cover and remove the waste toner bottle..seated just above the waste toner bottle..press on the drum unit that sits above it..you will here it pop back into place .. if you hear it snap back it simply power off than back on printer....
if the drum is seated correctly.. than you need to replace the drum unit

Testimonial: "This worked, thanks!!!"

SOURCE: Kyocera FS3900DN Error 7410:0271683

push the drum until it clicks
power off/on

SOURCE: We have a system error C-4000 on our Kyocera Mita

Hello sir; Unfortunally the error code you display can not be reset tha's laser motor defect you got to replace it or repaire.

SOURCE: I have a Kyocera FS-2000D printer that will not print

first turn off your pritner power.
check open the front door pull your ink cartridge then clean dust and blur from it then check there is not any paper jam then refix ink cartridge.then turn on the power.

SOURCE: Kyocera FS 4000 cassette error

under the front of the cassette on the bottom is a white catch if you pull it towards you the paper will spring up. more then likely it is not automatically getting pushed when you put the cassette in.
if this is not correct if you take the cassette out and look in where you took it out of there should be a arm hanging down just left of center that is the paper out sensor arm of that is broken it could be your problem also