When power supplies do not function properly, please check the following troubleshooting table before returning a unit. If the power supply still has a problem, please contact the designated distributors or our customer service desk for information (a Return Merchandise Authorization (RMA) number in U.S.) about how to return the power supply to us.

1.In case of No Output - what to check

Possible Causes

Input Side

• Wrong AC voltage is applied.
• AC voltage is not applied to power supply correctly.

Output Side

• (1)Wrong connection.
  (2)Loosened terminal screws.
• Overvoltage protection has been operated.
• Remote ON/OFF is off.
• Power supplies used in series operation.

2.In case of Abnormal Output Voltage(Too High, Too Low, Unstable) - what to check

Possible Causes

When output voltage is too high.

• Output voltage is set too high.

When output voltage is too low.

• Input voltage is too low.
• Output voltage is set too low.
• There is a voltage drop caused by output wires.
• Overcurrent protection has been operated.

When output voltage is unstable.

• There is oscillation caused by remote sensing.
• Minimum output current required is not drawn.