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Hakko FX-951

2016/07/20 By staze

Hakko FX-951Well, I finally did it. After years of soldering with an old Weller WTCPT, and an equally old Hakko 936, I decided to upgrade to a modern FX-951 (kit), and the Micro-soldering hand-piece (FM-2032). I’ve been doing more and more SMD work lately, on multilayer boards, and there just wasn’t the thermal capacity in my previous irons. And while the JBC stations looked appealing, they didn’t look $450 appealing. Also, the thought of finding parts, tips, etc wasn’t overly appealing. Where I know Amazon and even Fry’s stock tips for the Hakko.

I ordered the unit from tequipment.net, my usual source for this kind of thing. They offer the best education discounts, as well as one for eevblog members, and often will discount even more if you’re buying a lot of equipment. Sadly, I didn’t buy my FR-810 at the same time. I did buy the FX-951 Kit, the curved tip (T15-J02), and the Micro-Pencil curved tip for it (T30-J). Oddly, the T30-J shipped separately, but meh.

Once I had the unit, I also had purchased the T15-D08 tip at Fry’s earlier, and was able to immediately switch it it (the unit came with a conical tip, which are generally useless). The unit fit perfectly on my bench, and the feel of the iron is great. Some basic soldering tests showed it had a HUGE amount of thermal capacity. I was able to solder easily to ground planes, and thermal “pads”. Heck, I was even able to do some chassis soldering that previously required my giant Weller D650 soldering gun.

The best part of the unit, though, is swapping tips. I bought a couple extra “sleeves” when I ordered the unit so I could swap tips, and indeed, swapping them is crazy easy. Just unclip, drop into holder, and clip a tip in. The worst part, though, is the incessant “beep” when the tip is unplugged, but thankfully, you can disable that via the info in this document.

I love the iron. Much like switching to Ubiquiti for wireless, and never wanting to go back to consumer wireless, I am not sure I’ll ever go back to a consumer soldering iron. =)

[xrr rating=5/5]

Filed Under: Reviews Tagged With: FM-2032, FX-888D, FX-951, Hakko

Repairing a Dell 1800FP Power supply

2016/07/12 By staze

1800FP PSUI have an ancient Dell 1800FP monitor at work that is used for a print release station (users swipe their cards, select their print job, and print it). This monitor runs 24/7, and has probably been running for next to 2 years pretty much solid. The other day, we had a power outage in the middle of the night, and when we came in the next morning and tried to turn the monitor on, it wouldn’t turn on (nothing). Knowing no other option than to try to fix it, I opened it up, and checked the voltage rails (12V and 5V). Both were pulsing on and off about once a second, and the power supply could be heard “ticking”.

I took the unit home (where I have a better setup for soldering/repair) and found several dry/cracked solder joints. Fluxing and reflowing those, however, didn’t fix the issue. Checking the main output caps all showed good as well (ESR all 0.0ohms on my blue meter). Thinking about it some more (what it was doing), it SOUNDED like it was basically starting up over and over again. So I checked the control chip, ICE2AS01 (this seems to be the primary failure on these units), IC901, and it looked fine (no short between ground and VCC). But then I checked its decoupling cap (C907, 47uF 50v): 27ohms ESR. Huh. The decoupling cap (C924, 33uF 25V) for the opto-isolator showed 4ohms ESR. I pulled both, and checked them again (with my DER DE-5000). C924 checked out relatively okay… 4ohms, 30uF (certainly a bit high on the ESR, but the capacitance was within spec). C907, however, was WAY off. ESR measured at 28ohms, and capacitance at 8uF. That’s more resistor than capacitor at this point. Digging through my old boards, I found another monitor supply board that had an exact replacement for C907 (47uF, 50v), and a close replacement for C924 (39uF, 35V). Both fit, and both measured close to 0.1ESR. MUCH better. I popped both in, soldered, and fired the unit up. No clicking, and solid 12V and 5V rails.

Yay, job done. So, while the power outage may not have helped, I’m guessing the unit was probably in this state for a while, and the fact that it was power cycled was the issue. Once that ICE2AS01 is up and running, that decoupling cap probably doesn’t overly matter. But on startup, it’s needed, and there just wasn’t the capacitance there to actually get the IC fired up.

Anyway, this is obviously another failure mode of these old units. And remember, just because there is no sign of bulging for venting doesn’t mean a cap isn’t bad. Just means it may have not failed quite so catastrophically as to vent.

Filed Under: Electronics Tagged With: 6870T445D10, C907, C924, Dell 1800FP, IC901, LG, PSU, repair

Repairing two Ubiquiti Toughswitch Pro 8’s

2016/05/31 By staze

ts_8poe_proI recently purchased two listed-as-broken Ubiquiti Toughswitches off eBay for $65. They were listed as not working, unable to boot. They admitted very little troubleshooting had been done to the units, but I couldn’t pass up the price since I’d been looking for one of these switches, but they sell for more than I wanted to pay, and a friend also wanted one, so I figured I’d sell it to him if I got both working. Buying them, I figured there were two likely causes. One being a firmware corruption, and they just need to be re-flashed using their tftp mode, or two being the power supplies had failed (power surge, lightning strike, wear and tear, etc). I know from research that these switches have an internal AC/DC power supply that supplies the switch board with 48V, which I can replicate easily enough on my bench. It seems it’s not that uncommon for people to replace those internal PSUs with DC/DC converters for use in wireless installs that only have DC available, but that’s not what I’ll be dealing with here, hopefully.

The unit’s were delivered on Memorial day (oddly), and initial inspection showed no power up at all, and no ground continuity between the ports and the power ground. Huh. I opened both units, and found the failure modes to be completely different. On one unit, the power supply was dead. The fuse had blown (easy to replace), and the main SMPS chip, a TEA1755T was cracked. The failure was bad enough that it blew the trace off the ground connection. So I ran some 20AWG wire from the ground to the screw so there was a good ground again. I ordered and replaced the TEA1755T and the power supply started working again. Sadly, the switch board also had an issue, but more on that in a bit.

On the second unit, the PSU was good, but the LM5005 buck regulator that takes the 48V input from the PSU and converts to 24V was blown (complete with a hole in it). I ordered a replacement and replaced it, but man, TSSOP chips suck to replace. Once that was replaced…

One the first unit again, supplying power to it (even with a bench PSU), results in a hissing sound from the Buck Regulator section, but a clean 24V output from the regulator. But, none of the unit starts up, as I don’t see anything on the main oscillator, and the unit certainly doesn’t boot. Tracing down where the 5V/3.3V rail comes from was a bit of a challenge, but it originates from…

Filed Under: Electronics, Sys Admin Tagged With: PoE, repair, TS-8-Pro, Ubiquiti

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