Often, a stuck job in memory is the cause.

: If the door trick fails, turn the main power switch OFF , wait 10 seconds, and turn it back ON .

Large MS Excel files with multiple worksheets or variable data can occasionally trigger "99" series internal errors.

It is often grouped with "99 codes," which are generally software or timing-related rather than simple physical jams.

Code 9903 indicates a "Video Data Transfer Error" or a "Memory/Controller Communication Failure."

: Ensure the machine is running the latest firmware version (specifically G00-RF or newer for modern models like the C-250i) to resolve known processing bugs.