When you press the button, you might hear a loud echo through the parent unit. This is normal. To minimize it:

Follow the numbered threading path on the machine, bringing the thread down through the tension discs, around the hook, and up through the take-up lever. Use the automatic needle threader to thread the needle. 3. Operating the BY02VBPS

Snap the high-pressure hose line into the dedicated water outlet on the machine body. Step 2: Purge Trapped Air (Crucial Step)

This is where the manual separates informed users from those who let out the “magic smoke.” The BY02V-BPS manual dedicates a full section to (e.g., CE, RoHS) and operational hazards.