Error code - Different paper size is set. Check paper size

SOURCE: paper tray full message and not printing

there is a black tab in the center where the papers come out that is the tray full sensor arm that is more then likely stuck

SOURCE: I have a kyocera FS-2000D

check the basic user guide Chapter 4 - Troubleshooting pages 4-5 to 4-10 about a specific error message.
Make sure you are using the latest print driver from kyocera website !
If is really need it you can expand the memory !!

SOURCE: wont print on card stock, legal paper- keeps jamming

Menu> scroll to Paperhandling> MP Tray type>>(plain) try changing this to cardstock  <enter>
instead of MP Tray type do the same for Cassette if you desire....
Best, danakadan

SOURCE: Kyocera Ecosys FS 920

There are actually some certain meaning on the red light and green light showing different information to user. The summaries are:
1) Green On, Red Off = Printer Ready.
2) Green Fast-Flashing, Red Fast-Flashing = Printer warm up.
3) Green Fast-Flashing, Red Off = Printer off-line.
4) Green Slow-Flashing, Red Off = Processing Data.
5) Green Off, Red On = Cover Opened, Toner Empty or Developer Unit / Drum unit missing.
6) Green Off, Red Fast-Flashing = Paper Jam or waiting for jam reset.
7) Green Off, Red Slow-Flashing = Paper Empty or Paper tray is not inserted.
8) Green Off, Red Off = Printer power is off.
9) Green Very-Slow-Flashing, Red Off = Printer in sleep mode.
10) Green (any condition above), Red Slow-Flashing = Toner low or paper empty.

So what is your printer condition? Better know what is going on your printer so can solve the problem.

YBC (/\)

SOURCE: Kyocera FS2000D. Paper jam reported occassionally

this is problem with sensor you have to check all the sensors like
registration sensor
duplex jam sensor
paper exit sensor
face down tray paper full sensor........

easy way to solve this problem is remove Durmunit and toner box and rear unit then clean it useing a blower and refix all the componet and try...........