The Sanyo Denki DA0D020DL67S01 is a compact DC servo amplifier designed for precision closed‑loop motor control in industrial automation systems. Common failure points for this class of amplifiers include power supply input degradation, overheating of the output transistors or MOSFETs, and loss of communication with the host controller due to corrupted firmware or damaged I/O connectors. First‑check diagnostics should verify that the unit receives its rated DC supply voltage and that all current‑sense resistors are within tolerance; inspect the PCB for burn marks, cracked solder joints, or swollen electrolytic capacitors. Finally, review any error codes reported by the host controller and confirm that the amplifier’s serial communication lines (e.g., RS‑485 or CAN) are clean and properly terminated.[oss-gpt-20b]