Power Electronics ( PE ), Power Supply Units ( PSU ),Uninterruptible Power Supply ( UPS ), all those terms have to do with current! All the above come in different types and shapes! Linear or Switching, all are having the same goal! To provide us with the suitable voltage and current we need for a specific devise(s). Occasionally those sets are failing! Repairing them demands a deep knowledge of the operating principals. This is what we do here in TeleGun International Ltd. No matter what the device is, give as a call! We will be happy to assist you solving the problem!