Disassembly
_
The X-Calibre 400’s input filtering consists of three X-Capacitors, two coils and two Y-Capacitors, which is enough components to filter out the EMI. There are no MOVs installed, however, so it should be used with a surge protector. The bridge rectifier used is rated at 6A, and the primary capacitors are rated at 680µF and are supplied by Sun, a brand I haven’t had a lot of experience with. The switching transistors are Semiwell SBP13009-Os which are rated at 12A. These parts can sometimes deliver 400W if the power supply is well designed and well cooled, but that wasn’t the case here. Note the melted washers and the melted leg on the transistor to the far left.
_
Most of the secondary capacitors are supplied by Teapo, but the lone 12V capacitor, as well as one of the two 5vsb filtering capacitors, are supplied by Jun Fu. They are re-sleeved Fuhjyyu parts, and are extremely low quality. I score capacitors by the weakest link – it only takes that one 12V cap to fail before the ripple goes through the roof and you can kiss your hardware goodbye.
The 12V rectifier is an STPS30H100CT schottky rectifier rated at 30A, so this rail is theoretically capable of up to 30A. This is good enough, as the label claimed this power supply to have 366W, or 28A worth of 12V capacity. The 5V and 3.3V rails both use the popular STPS3045CW schottky rectifier, so they too are theoretically capable of up to 30A.
_
The soldering is fairly tidy, except that some of the legs are too long. One leg on a small capacitor was bent over and was very close to shorting on a neighbouring joint.
_
The fan is branded Xigmatek, but its real manufacturer is Shenzen PowerYear, a brand I’m not very familiar with. This is a sleeve bearing part and, unfortunately, the bearings didn’t have very much lubricant in them. It was only quiet with the power supply loaded below 200W. The heat sinks are a little on the small side, with only three fins. Since this power supply uses the older and less efficient half-bridge topology, some more surface to air contact would be better.
Loading ...