Microsoft XBOX 1.4 power supply PSU startup problems - 5V 12V too low

At low voltage level on the 5V and 12V rail is there to system instability and startup problems. First and foremost, this is expressed in sporadic interruptions of the hard drive and the DVD drive. As both voltages are monitored together, the voltage drop equals percentage. (In the present case - 17%) The 1 k is to blame-potentiometer on the secondary side, which failed its service due to corrosion and ageing. After Exchange (1-2k, exact value not critical) of the same and a recalibration should be fixed to the trimmer with paint. Said applies to a power supply of the company "DELTA" for versions 1.2-1.6.