To fix the cashbox, you can follow these steps: 1. **Manual Opening**: If the cashbox is not opening automatically, you can use the key to open it directly. Alternatively, log into the cashier front end, go to the payment page, and click the "Open Cashbox" button to open it manually. 2. **Automatic Opening Setup**: To set up the cashbox to open automatically during cash transactions, go to the backend management program, select Sales Management - Cashier Management, and enter the Payment Method Management interface. Choose the payment method (usually cash) and configure it to open the cashbox automatically during checkout. If you continue to experience issues, please check the connections or consult the user manual for further troubleshooting steps.