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Thread Number: 53829
Electronic Component Identification |
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Post# 761424 6/4/2014 at 11:12 (3,613 days old) by DADoES  (TX, U.S. of A.) |
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 Can anyone who has experience with electronics identify what is the component labeled SG356? Someone who had it burn on their board is telling me it's a thermistor but I don't think that's right.
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| Post# 761493 , Reply# 1 6/4/2014 at 16:52 (3,612 days old) by hotpoint9534 (UK) | ||
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Looks like a thermistor to me: www.rhopointcomponents.com/surge-... Tom | ||
| Post# 761531 , Reply# 2 6/4/2014 at 19:22 (3,612 days old) by Magic_Clean (Florida) | ||
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Glenn it looks like a varistor. Meant to absorb voltage spikes. | ||
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Post# 761574 , Reply# 3 6/5/2014 at 01:06 (3,612 days old) by kb0nes (Burnsville, MN) |
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Glenn,
As Tom said above. Its a NTC Thermistor meant to limit inrush current. It appears to be made by API and is called a Surge-Gard Here is another web resource: www.rtie.com/category-s/48.htm... Not sure why I can't find the 356 model though... Just from the matte appearance of the finish I'd say its meant to run hot. Its not a Metal Oxide Varistor MOV | ||
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Post# 761598 , Reply# 5 6/5/2014 at 04:42 (3,612 days old) by DADoES (TX, U.S. of A.) |
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That all makes sense, the component is located on the board next to the incoming AC connection point. It's a motor controller board for an F&P GWL08, which is NLA. I'm in contact with someone whose board (not mine!) burned the item of note. She has an electronics tech willing to attempt repair on the board if they can identify the component and find a replacement (and assuming nothing else on it is fried). I sent a pic of my board to her but stupidly didn't check the resistance reading (which may or may not help her situation), which would require another 72-miles round trip to do so ... my GWL08 is being used by my sister. F&P of course does not publish specs for their boards. I could also investigate whether the (different from GWL08) board in the other two F&P washers in my possession have the same component ... I will send Phil's info and link, maybe that'll be of some benefit to them. Thanks, everyone! | ||
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Post# 761647 , Reply# 6 6/5/2014 at 08:56 (3,612 days old) by DADoES (TX, U.S. of A.) |
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I could also investigate whether the (different from GWL08) board in the other two F&P washers in my possession have the same component ...Yeah, no ... different board has different components. There's an NTC thermistor mounted in a similar position, presumably for the same function, but it's not an SG356. | ||
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Post# 761676 , Reply# 8 6/5/2014 at 11:07 (3,612 days old) by kb0nes (Burnsville, MN) |
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Overall that thermistor is likely the least critical component on that board. One could almost just bus it out for testing. Its only there to limit inrush current when the board is first energized and those big reservoir capacitors charge up. As long as it is sized to drop to the required resistance during operation then any NTC part could go there.
Odds are a typical failure that these boards might have is one of the pass transistors failing. If they short they will just pop the fuse. A motor controller like this is pretty straight forward, well at least the high power parts, so they should be pretty repairable. If the proprietary logic IC's fail then the board is likely doomed. The left most 3/4ths of the board shown should be reasonably repairable should the fault lie in the high power bits of the circuit. Fingers crossed for a rescue! | ||
| Post# 762192 , Reply# 9 6/8/2014 at 00:40 (3,609 days old) by gizmo (Victoria, Australia) | ||
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Found this link on another thread on the super forum... They don't list F&P boards by number but say in the text that fp boards are repairable so it is worth a call... CLICK HERE TO GO TO gizmo's LINK | ||
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Post# 762224 , Reply# 10 6/8/2014 at 07:31 (3,609 days old) by DADoES (TX, U.S. of A.) |
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Gizmo, I directed the woman having the problem to contact FixYourBoard.com and CoreCentricSolutions.com ... they declined to repair her board. Interestingly, her last communication to me advised that her electronics guy "repaired F&P boards for 15 years until he went into business for himself" (presumably doing electronics repairs other than F&P boards). So that brings up the point of why was she questioning me about the board if he has knowledge of them ... apparently he doesn't have experience with the GWL08 board. She was ecstatic to get the info I was able to provide, thinks they'll be successful. | ||
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Post# 763806 , Reply# 11 6/15/2014 at 13:15 (3,601 days old) by DADoES (TX, U.S. of A.) |
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