Disassembly
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The Input filtering starts with a small PC on the AC receptacle, which contains an X-Capacitor, a coil, and two Y-Capacitors. The main PCB contains another X-Cap, coil and two Y-Caps, so in total, there are two coils, two X-Caps and four Y-Caps. This is enough components for EMI (ElectroMagnetic Interference) filtering, but there are no MOVs for surge protection. The bridge rectifier is screwed on to a heat sink, and is rated for 6A. The Primary capacitors are 1000µF parts supplied by a company called 12Kuang Jin. The switching transistors are two 15A Fuji Electric 2SC3320 Bipolar transistors in the rather dated half-bridge configuration. Although there was no explosion, testing them showed that both had failed. The 5Vsb circuit uses a switching IC, as opposed to the less reliable 2-transistor circuits often used in cheaper products. The IC used is an ON Semiconductors NCP1014AP06. The primary side is controlled by a BCD Semiconductors AZ7500B PWM controller.
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The capacitors on the secondary side are supplied by Nicon, a brand which usually only appear in very cheap power supplies. I haven’t personally had a lot of experience with these capacitors, but the fact that most of the big OEMs seem to know better than to use them isn’t a good sign as to their reliability.
The 12V rails use two MOSPEC S30C100C rectifiers rated at 30A each, so the 12V rail is theoretically capable of up to 60A. These parts are more than good enough to handle the claimed 43A of 12V capacity. The 5V and 3.3V rails both use a MOSPEC S40D45C rectifier, which is capable of up to 40A. Again, this is more than good enough for what the label claims. The secondary side supervisor IC is an East Semiconductor Tech EST7610A. This IC only supports Over Voltage and Under Voltage protections. The OCP duties are handled by another IC which is soldered on to a small daughter board. It’s a BCD AS393 Dual Voltage Comparator.
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The soldering quality isn’t great, and I spotted a few potential issues. First, there are several long component legs. In one joint on the secondary side one pin is bent over and is very close to another joint. It isn’t quite shorting, but it is too close for comfort. Another issue is with one of the joints on the fuse. One pin didn’t get enough solder. Other joints have a little too much solder.
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The Fan is made by Young Lin Tech. This model is rated for 1700RPM, with an airflow of 63.85CFM and noise rating of 29.67dB. It is temperature controlled and was fairly quiet. The bearings do have a fair amount of grease in them, but thick grease isn’t as effective at lubricating bearings as oil. The heat sinks are thick and have a decent amount of surface to air contact.
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