What the manual says: Turn to the "Thermal Safety" section. The manual will instruct you to perform a PID autotune.
Fix: Navigate to the control box > Temperature > PID Autotune. Set the value to 150 degrees Celsius for the hotend and 60 degrees for the bed. Wait 10 minutes. The manual includes the exact G-code command (M303 E0 C8 S150) if you are using OctoPrint.
Q: The watch won't connect to my phone.
Q: The heart rate monitor isn't working. Yayusi S2 Manual Pdf
Q: Notifications are not coming through.
Q: Battery drains quickly.
Understanding the hardware is the first step to mastering the device:
The most common reason users search for the PDF is troubleshooting. Instead of scouring Reddit forums or waiting hours for customer support, the official manual provides: What the manual says: Turn to the "Thermal Safety" section
What the manual says: Check the "Driver Current" chart on page 34. The Yayusi S2 requires 0.8A to 1.2A for the X and Y axes. Fix: Use a multimeter to measure the voltage on the stepper drivers. The manual provides the Vref calculation formula (Vref = Current peak / 2). If the voltage is low, adjust the potentiometer on the driver board clockwise.