Final answer:
If you are unable to remove the tension on the MB-1 chain assembly, check for mechanical issues and consider consulting a professional for assistance.
Step-by-step explanation:
If you are unable to remove the tension on the MB-1 chain assembly by using the locking lever and reverse spinning the take-up wheel, you should check if there are any mechanical issues causing the tension to persist. One possible issue could be a faulty locking lever mechanism or a damaged take-up wheel. You may need to inspect these components and potentially replace them if necessary. If the tension is still not relieved after troubleshooting the mechanical aspects, it is recommended to consult the manufacturer or a professional technician for further assistance.