Interior Impressions, cont'.


The top PCB has its own interesting features which mostly center on its use as the location for the primary capacitors as well as the PFC rectifiers. The large heatsink in the center of the PCB houses the six Infineon PFC rectifiers while below these are the two Hitachi 390uF 105*C industrial-grade primary capacitors and two more large chokes.


The secondary PCB also holds a 6x32 high-speed fuse on the input side in order to protect your other components if something would go awry with the AC input. Looking a bit further, we can also see some additional Nippon Chemi-Con caps and a smaller transformer here as well.


The power relay Silverstone used is a Fujitsu FTR-K2 series unit which boasts extremely low impedance which means higher efficiency for this power supply. The specification sheet for this unit can be found here: http://www.fcai.fujitsu.com/pdf/ftr-K2.pdf

Finally we come to the actual OEM for the ZM1200. Once again Silverstone has seen fit to use Impervio Electronics as they have been doing for most of their recent high-end designs. A few months ago Impervio was a relatively unknown OEM in the power supply business but they have been making some huge inroads with their completely automated manufacturing process. They are based in Taiwan and now (finally) have a website where PSU aficionados can check out their wares: :::IMPERVIO Electronics Co.Ltd:::


The backside of this top PCB is a lesson in precision soldering. There is not one point where there is any excessive flash or other leavings normally associated with a botched soldering job and overall, it shows some amazing attention to quality.


Finally, we have the amazingly hard to reach rail switch. It looks to us like under normal circumstances (ie: getting to it without voiding your warranty) you will need a pin of another suitably miniscule tool to switch it. Just remember: ON means there are multiple +12V rails while there is a single rail when the tiny rocker arm is moved into the lower position. Please don’t go jabbing around in here without assessing the situation since you don’t want to hit anything important like a resistor on the PCB.