Are you getting a specific in your software, or is the computer not seeing the USB at all? Important Installation Instructions
| Error Message | Cause | Solution | |---------------|-------|----------| | | Windows 10 blocks the JK 721 driver. | Disable driver signature enforcement (see section 4). | | “Device not recognized” | CH340 driver missing. | Download and install CH340 driver from WCH.cn. | | “Communication timeout” | Wrong COM port or baud rate. | Check Device Manager for correct COM port; match baud rate with plotter’s LCD menu. | | “Plotter does nothing” | Software sending wrong protocol. | Ensure software is set to HP-GL (not DMPL or other). | | “Cutting is distorted” | Speed/force settings or incorrect driver page size. | In driver properties, set page size to A4 or custom 720mm width . | Jk 721 Cutting Plotter Driver Windows 10
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