Re: APC UPS Schematics
I don't think its a fault in the UPS itself. I feel it is a shortcoming of the battery type used. Not being able to replenish the electrolyte is probably the main killer. The entire pack getting nuked and swelling is probably related to overcharging from a failed cell. Prompt attention and replacement obviously eliminates the issue. That, and avoiding cheap offbrand Chinese batteries. I seem to have the best luck with Powersonic and CSB. I'm sure everyone has their own opinions.
jbbenson
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Last Activity: 08-02-2015, 08:52 PM
Joined: 10-19-2006
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Re: APC UPS Schematics
Willawake, I finally got around to unracking the UPS. Rather than bend the case trying to get the old batteries out, I hit the one that was stuck with a 3lb sledge hammer (not hard enough to rattle much other than the tray). They came right out.
It also turns out that I probably don't need a schematic to fix it... I found a bad 250VDC polyester film cap under the slot that the management card slides in to. The side of the cap was completely blown out (probably from surge). I'll order some replacements the next time I make a Mouser ...Leave a comment:
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Re: APC UPS Schematics
Yeah, mine (SU1400RM2U) nuked the batteries a couple of weeks ago (in addition to the voltage trim problem). I could only get the battery tray about a quarter of the way out, and haven't had the motivation to pull it out of the rack and take it apart.
I remember the setting that you're referring to, and I believe I set it to the highest setting.Leave a comment:
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APC UPS Schematics
I've got a SmartUPS 1400 (rackmount) that has an issue with reading the incoming line voltage as too high and keeping the voltage trim feature active all the time. I grabbed the commonly available schematics off of eserviceinfo.com and studied what I found. I googled a few things from those schematics and hit the jackpot.
The following site has quite a collection of APC schematics and so far has remained online (though how long it will remain so after I post this is unclear).
[URL=http://www.upsclub.org/schem]http://www.upsclub.org/schem[/URL]I've got a SmartUPS 1400 -
Antec Earthwatts EA-430 high 12V
I picked up one of these open box as CompUSA was shutting its doors in the Dallas/Ft.Worth Area. Its currently powering a non overclocked Intel Q6600, on a Gigabyte G31M-S2L, diskless as a dedicated folding box.
It works well and runs cool, but I'm concerned about the 12V rail. Under load, it reads a bit high on my multimeter. I'm getting 12.35 at the molex connectors, and 12.30 at the P4 connector. Onboard voltage sensor reads higher at 12.45. I know ATX spec is +/- 5%, but should I worry about it?
I'm also beginning to wonder if it was an early production model...... -
Re: Used Scope Recommendations?
This may be overkill, but I am now the proud owner of two oscilloscopes.
One is a Tektronix 453 (acquired locally for a song). The other is an eBay special(powers up/no way to test/no guarantee) Tektronix 7603 with 7A22 and 7B53A plugins. It works, but I'm still debugging power supply issues. Here's the irony: I've nailed the problems down to bad caps, and a couple of fried transistors. It also has a bad case of dust contamination.
The 453 is in better shape, and works a treat after cleaning the nuvistor sockets in the...Leave a comment:
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Re: Antec Tru430 Fan Control Circuit
I finished the repairs and put the PSU back together yesterday. No magic smoke escaped this time!
Voltages at the ATX connector:
12V @ 12.11V
5V @ 5.14V
3.3V @ 3.37
Measurements were done with only a sacrificial half height 3.5" drive as a load.
The fan circuit is now functional with an output voltage of 11.07 when the PSU lightly loaded and at room temperature. Although this is higher than expected, I don't have a working point of reference to see exactly where it should...Leave a comment:
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Re: Antec Tru430 Fan Control Circuit
Yeah, that's what I was thinking too. Of course, it didn't help that I had a solder booger shorting something out which caused the initial problems to begin with.Leave a comment:
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Re: Antec Tru430 Fan Control Circuit
I've found the value. Just had to desolder what was left and put it under a magnifying glass to see it. 100 ohm, and I'm guessing 1/8 watt by how danged small it is. Verified against the True380 awaiting new caps too. PCB layout is identical. Off to Frys to try and find a replacement.Leave a comment:
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Re: Antec Tru430 Fan Control Circuit
Just thought I would post an update. While preparing to replace the questionable transistors, I found what was left of a resistor that burned completely in half. I just flat could not see it with the components packed in as tightly as they were. Live and learn I guess. Now to try and identify it for replacement. I'd take pictures, but my digital camera died several months ago.Leave a comment:
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Used Scope Recommendations?
I think I'm ready to add an Oscilloscope to my work bench. Can anyone recommend a nice used model to look for? My main interests are power supplies and audio right now, but I'd like something with a bit of room to grow. I'd like to go into Electrical Engineering at some point, when I'm far enough along in my studies!
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Re: Antec Tru430 Fan Control Circuit
Some more relative information:
The fan circuit was lightly loaded with only the PSU's two cooling fans connected. I was doing initial testing after the recap. I had plenty of time to kill, so I've pretty much done all the troubleshooting tips you listed. To make a long story short, the failure was (most likely) caused by a stray blob of solder. It had shorted the leads of several components together. It was likely from my desoldering, or tinning the tip on my iron The only reason I even noticed it was because it was more shiny...Leave a comment:
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Antec Tru430 Fan Control Circuit
I had the fun and joy of recapping a True Power 430 this evening. All went well, with the exception of the fan control circuit. Voltages for all lines are well within spec, so that much was a success. However, on powerup something in the fan control circuit let out its magic smoke. Both the header on the board for the internal PS fans, and the two external molex connectors read highly erratic on my DMM. I can't really get a reading for any sort of reference, and I don't have a scope to look at the waveform. Does anyone have experience with that particular part of the circuit and a rough idea what...Last edited by jbbenson; 08-25-2007, 10:25 PM. -
Re: Sunon Fans
I've had good luck with Sunon personally. I've got probably 15+ of the ball bearing 80mm variety scattered throughout various power supplies and systems. Most are pushing 4-5 years of age. I'll admit though that I haven't bought any recently. They do seem to get noisy with age. Only one notable failure to date (40mm sleave), excluding the one that I dropped and busted the rotor on. They seem to have declined in quality recently though.Last edited by jbbenson; 05-29-2007, 11:11 PM.Leave a comment:
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Re: APC UPS units - troubleshooting
Hate to thread hijack here, but I've got an APC SmartUPS 1400 (2U Rackmount) that is stuck with the voltage trim function active. Incoming line voltage is about 123VAC, but the unit reports it as 137V. If I connect the UPS to my variac and drop the line voltage down to about 107, the trim turns off, and the UPS reads normal line voltage. Something is jacked in the sense circuit.... my bets are on a bad solder joint, resistor or capacitor. It has worked fine in the past, and occasionally (rarely) will function properly. Anyone have an idea where...Leave a comment:
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ABIT BH6 exploded, need replacement MOSFET suggestions
My old reliable BH6 has finally bit the dust, but I'm looking to try and fix it. I'm unsure what exactly happened though. I had been running a Coppermine Celeron 1100@1232, which probably over taxed the poor thing. The damage done is extensive. Both VRM MOSFETS are cracked wide open, the wirewound filter at L11 is burned beyond recognition, a diode at D1 was completely blown off the board, and 4 filter caps are popped.
So, I'm looking at a recap, an unknown diode, tracking down replacements for obsolete MOSFETS, and hoping that the MOSFET driver is not toasted in the process. As...
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