The E1 error on Brother embroidery machines typically indicates that there is a problem with the connection between the machine and the computer. This can be caused by a number of issues, such as a faulty USB cable, a problem with the computer’s USB port, or a problem with the machine’s internal circuitry.

To troubleshoot the E1 error, you can try the following steps:

1. Check the USB cable to make sure it is securely connected to both the machine and the computer. If the cable is damaged or frayed, replace it.
2. Try using a different USB port on the computer. If the machine is connected to a USB hub, try connecting it directly to the computer instead.
3. Check the machine’s manual or online documentation to see if there are any firmware updates available. Installing updates may resolve the E1 error.
4. If none of the above steps work, it may be necessary to have the machine serviced by a qualified technician. They will be able to diagnose and repair any underlying issues that are causing the E1 error.