Repair Aids for the Kyocera FS3900DN – FS4000DN Error Code C6000 Low Fuser Temperature Problems
The  Kyocera FS3900DN – FS4000DN Error Code C6000 is low temperature error. unlike some other manufactures these errors aren’t that specific. There for if you really want to figure out what is going on your going to have to do a little digging. Now if you aren’t overly concerned why the fuser is not working then you might just want to skip to the bottom of the article and click on the link to the fuser replacement instructions. On that page, like this page, you can find a link to order in a replacement fuser and then follow the instructions to replace your new fuser. However, if you feel like digging through your machine looking for a possible fix without replacing the fuser, then below I have provided what the service manual has to say on the subject along with some of my own advice.
Kyocera FS3900DN – FS4000DN Error Code C6000 Description Â
Broken fuser heater lamp wire The temperature does not reach 100 °C/ 212 °F after the fuser heater lamp has been turned on continuously for 30 s.
35/37 and 45/47 ppm printers (EUR/USA model):
Fuser thermistor M detection temperature does not rise by 1 °C/1.8 °F after the fuser heater lamp has been turned on continuously for 10 s during warm-up or at standby.
Fuser thermistor S detection temperature does not rise by 1 °C/1.8 °F after the fuser heater lamp has been turned on continuously for 5 s during warm-up or at standby.
The temperature does not rise by 1 °C/ 1.8 °F after the fuser heater lamp has been turned on continuously for 5 s during printing
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Service Manual Repair Aids for the Error Code C6000
1. Poor contact in the fuser thermistor M connector terminals.
Reinsert the connector.
2. Fuser thermistor M installed incorrectly.
Check and reinstall if necessary.
3. Thermal cutout triggered.
Check for continuity. If none, replace the thermal cutout.
4. Fuser heater lamp installed incorrectly.
Check and reinstall if necessary.
5. Broken fuser heater lamp wire.
Check for continuity. If none, replace the fuser heater lamp.
Additional Repair Aids
1. Turn the machine off then back on. A fuser error code is not always catastrophic. They do happen from time to time and a simple power reset can fix them.
2. Looking at the back of the machine, power it up and tell it to print a print job. Look for the lamp to turn on. On some machines they heat up the fuser when the machine first turns on. Others power it up only after a print job is sent to it.
3. If the lamp lights up then check the thermistor, clean, then reinstall. Test again.
4. If the lamp doesn’t turn on then follow the steps from the service manual. Check continuity throughout the fuser circuitry. Below you will find a diagram of the fusing assembly to show you the various parts.
5. Replace the fusing assembly.
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Click on the link below for the illustrated instructions for the fuser removal and replacement
—  Kyocera FS2000, FS3900, FS4000 Fuser Replacement  —
