Having issues with Alarm Display: A.840. Alarm Name: Encoder Data Error on Sony SI-F209 Electronic Part Mounter? Read our step-by-step SMT maintenance solution below. If you require replacement feeders, nozzles, or sensors, contact SMTBOX for OEM-compatible parts.
Alarm Display: A.840
Alarm Name: Encoder Data Error
1. Situation at Alarm Occurrence: Occurred when the control power supply was turned ON.
Cause: A malfunction occurred in the encoder.
Corrective Actions: Turn the encoder power supply OFF and then ON again. If this alarm occurs frequently, replace the servomotor. Replace the SERVOPACK.
Cause: A SERVOPACK board fault occurred.
Corrective Actions: Replace the SERVOPACK.
2. Situation at Alarm Occurrence: Occurred during operation.
Cause: A malfunction occurred in the encoder.
Corrective Actions: Correct the wiring around the encoder by separating the encoder cable from the power line, or by checking the grounding and other wiring.)
Cause: An encoder fault occurred.
Corrective Actions: If this alarm occurs frequently, replace the servomotor.
Cause: A SERVOPACK board fault occurred.
Corrective Actions: Replace the SERVOPACK.
Our editorial team consists of senior SREs, mechanical engineers, and SMT assembly specialists with over 15 years of industry experience in PCB assembly line optimization. All technical articles are reviewed and verified for mechanical and electronic compatibility before publication.