Cosel is one of the world's leading power supply manufacturers offering
high-quality, ultra small size AC-DC power supplies,
DC-DC converters of the state-of-the-art technologies, and effective and
easy-to-use noise filters.

Home>Technical Data>Troubleshooting Tips

1. In case of No Output - what to check
2. In case of Abnormal Output Voltage(Too High, Too Low, Unstable) - what to check

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

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

♦Thermal protection has been operated.
♦There is a condensing on power supply.