: A red LED (HL1) protected by a diode (VD1) indicates the generator is operational. Operational Highlights Efficiency : The
: If the power indicator is on but no ultrasonic waves are visible, it usually points to a burned-out transducer or a generator fault . : A red LED (HL1) protected by a
: A frequent point of failure; it is often replaced with a 12kΩ (0.125W) resistor during repairs. Diodes : Frequently used parts include the or . : A red LED (HL1) protected by a