Our fan of the day comes from Xiongli, and it is a sleeve bearing unit. I have some doubts about this lasting over time, so the fan point will come off today.
The innards look to be from HEC, though it's a little hard to be sure with this one. I could be wrong, but I don't think I am. Love the heatsink area on both sides of this unit... clearly, they played a major role in our surprising hot box results.
We have no line filtering components here, but we do have an issue that will be scored on. See the AC input switch leads? The one for the black wire is bent over and almost shorting on the white one. That's not a problem for you and me here in North America, but you get this thing into Australia? Flip that switch to 230V with these pins shorting out? KABANG!!! No more primary side.
Another issue. A minor one. Why the heck would you ground the unit via a PCB mounting screw when there is a PERFECTLY GOOD grounding standoff right next to it? Is the factory hurting so much that one screw is going to break them? Absurd. I'm going to fix this. With the addition of exactly one damned screw. Do your cost cutting on someone else's dime, OEM.
What the... oh, I see. The foam is extra insulation to make up for the seriously flimsy plastic insulator under the PCB. But at least it has the insulator, and something extra to make up for the flimsiness. Not every unit goes to those lengths.
Soldering is almost good enough to let go with no deductions. Almost. I see solder spots on the board that shouldn't be there.
This unit is distinctly lacking in line filtering components. I see one X cap, two Y caps, and one coil. Sometimes I'll let them off with, say, two Y caps missing because these don't always need complete line filtering to do the job. This time? Not going to happen. I usually pull a full point for no line filter or half a point for only part of one, and this one falls into the latter category.
A single GBU606 acts as a bridge rectifier. No heatsink, but considering we had a clean full power pass at thirty-nine degrees I can let that go.
Yes, the main filter caps are 85 degrees. No, that's not a big deal.
What is a big deal is the brand. Johnson Electric. Third tier if ever I saw it.
On the secondary side, we have a Weltrend WT7502 protection IC, good for basic protection only. Let's find another angle and see whose factory these capacitors come from.
ChengX. Third tier, and they're on the always active standby rail.
Here, we have a couple more from Johnson Electric, and... sigh... Asia X. Folks, we've got Fuhjyyu. Yes, they're still making capacitors. This could be why the unit has such a low temp spec... to make up for the capacitor quality.
And the 12V side of things has an incomplete pi filter. Well, I'll let that part go this time... the unit was in spec. It's just the capacitor selection I can't get past, here.
A UC3845B current mode controller and VIPer22A can be found here.
Two SLF16N50C parts make up the main switchers of this unit.
Two PTR20100CTs handle the 12V side of things. Wow... those parts can take up to 150 degrees. They don't even start de-rating until the 110 degree mark. They're not that high in capacity, but man can they ever handle some bad weather. This is a big reason why this unit is still alive right now.
The minor rails are handled by one S30D45CS each.
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