Try unplugging network cable turn off unplug from wall replug see if it comes ready without network cable plugged in if it does delete print queue after you rehook network cable F errors are always print job related
SOURCE: error code C 6400
This code is a fuser problem code. Follow the procedure below. If the code does not reset or comes right back then: you will have to check the thermistor, thermo fuse and fuser lamp. If 1 or more are defective then replace. After you replaced the defective part you will have to clear the error code again.
Here's the way to reset that fuser code;
First open top cover then turn on power.
press system menu/counter
arrow down to service
press and hold start, # then enter keys
arrow down to maintenance
press enter
arrow down to Sim 163
press enter
select execute
press enter
turn off power then back on
SOURCE: CLEANING A KYOCERA FS-2000D
Follow the page http://www.fixya.com/support/t1336338-kyocera_fs2000_thin_black_vertical_line
Basically, you remove the cartridge and developer all at once, then remove the waste toner bottle, then push the grey tab in to release the drum cartridge (be very, very careful in removing and putting back in. Any scratches on the drum and you will enjoy black spots permanently on printouts).
On the right side of the grey charger section is a tab you can use to release it. Do this, then put the drum away in a light tight back to prevent damage to it.
The reason why this Kyocera printer doesn't have the primary charger wire cleaner is because it did away with it. It now charges via a black fuzzy looking roller on top which is like the secondary corona charger wire, which then applies it to a roller, which then applies it to the drum. I think this is nice since it should prevent printer quality problems better since there is nowhere for oxidation to really collect. But, OTOH, it does happen anyhow.
I cleaned mine off and the streaks disappeared. I used a non amonia based cleaner to help, since I didn't find any dust on it to begin with. Whatever you choose, do not get your fingers on it, or it will put oil onto the rollers and that will make it worse.
Worked for me.
SOURCE: MY COPIER (KYOCERA 1635) DISPLAS ERROR C6050. HOW
C6050 Abnormally low fuser unit thermistor temperature The fuser temperature remains below 90°C/194°F for 1 s. Poor contact in the thermistor connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Broken fuser thermistor wire. Measure the resistance. If it is ∞ ω, replace the fuser thermistor. Fuser thermistor installed incorrectly. Check and reinstall if necessary. Fuser thermostat triggered. Check for continuity. If none, replace the fuser thermostat. Fuser heater M or S installed incorrectly. Check and reinstall if necessary. Broken fuser heater M or S wire. Check for continuity. If none, replace the fuser heater M or S. Code Contents Remarks Causes Check procedures/corrective measures
SOURCE: How to solve error c6020 for Kyocera KM-2035
The C6020 is a fuser error code and should be checked out by a Kyocera tech.
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