Here is a possible question related to the error described:

What is the meaning of the machine code KM-ASSYM5-02 and what is the cause of the "rear buffer conveyor belt discharging operation timeout" error that is identified by the M91 error code?
The solution for the M91-Rear buffer conveyor belt discharging operation timeout error may involve several troubleshooting steps. These steps could include checking the conveyor beltâ€™s condition; enabling or disabling the rear buffer convey