Check the cables. When connecting the cable to the receipt printer, ensure the cable connection is tight. Make sure none of the cable's USB port is bent by examining the end of the cable. If any of the cable's USB port is bent or broken, the cable may be defective and should be replaced. Please contact the relevant technical staff.

Last, if you still can't solve your problem by using the above-mentioned methods. It's possible that the cash drawer could be at fault. Please contact the relevant technical staff.

Tip: Learn how to manually release the cash drawer