Kyocera FS FS-3900DN Operation Manual page 54

Troubleshooting
4-10
RAM Disk Errors
Code
Format error. Try turning the power off and on again.
01
RAM disk mode is Off. Turn RAM disk mode On from the operation
02
panel.
No disk space. Purge unnecessary files.
04
Specified file is not on disk.
05
Insufficient printer memory to support the RAM disk system. Expand
06
printer memory.
Meaning
OPERATION GUIDE