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Post by mastertech on Feb 18, 2014 13:50:51 GMT -5
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nashou
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Post by nashou on Feb 18, 2014 16:28:43 GMT -5
I think I'll give it a shot. My new pre heater unit comes tomorrow !  |
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Post by mastertech on Feb 18, 2014 16:36:40 GMT -5
I would poke around those IPM's with your diode tester to see if there are a lot of pins shorted to gnd. Also check those FET's on the other heat sink. just probe for shorted legs.
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nashou
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Post by nashou on Feb 18, 2014 17:24:35 GMT -5
I would poke around those IPM's with your diode tester to see if there are a lot of pins shorted to gnd. Also check those FET's on the other heat sink. just probe for shorted legs. I will. At work tonight. I am watching an IPM removal repair on Youtube as I type. My pre heater is really going to help on this one!!! I do need to get one more tool. A good de solder iron with a triggered vacuum pump. Nashou |
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Post by mastertech on Feb 18, 2014 17:53:10 GMT -5
I would try to verify if it is one or both of those first. The older design, like in the video had high failure rates. If you can verify a problem with yours then you need to remove those heatsinks and get some number off of them since they may not be available.
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nashou
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Post by nashou on Feb 18, 2014 19:17:50 GMT -5
All righty Sir!!! I would try to verify if it is one or both of those first. The older design, like in the video had high failure rates. If you can verify a problem with yours then you need to remove those heatsinks and get some number off of them since they may not be available.
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nashou
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Post by nashou on Feb 18, 2014 23:25:13 GMT -5
Ok Mac I think the IPM's might be ok. But there are 4 FRED's That show short between all pins on all 4 . these are them FCU20A40 www.datasheetarchive.com/dl/Datasheet-024/DSA00414980.pdfI guess I'll have to remove and test out but it looks like there is nothing else in the circuit to show a false flag. Nashou |
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nashou
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Post by nashou on Feb 18, 2014 23:28:50 GMT -5
Just tested the same type on the other SUStain board and those show no short like the Y sustain fred's do. so looks like those need to be changed out.
EDIT: Found another FEt this time a surface mount type bad as well right between two of the FRED's this is a 20LC30
Nashou
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Post by mastertech on Feb 19, 2014 9:52:18 GMT -5
Well at least the parts are available.
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nashou
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Post by nashou on Feb 19, 2014 10:33:53 GMT -5
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Post by mastertech on Feb 19, 2014 12:08:05 GMT -5
Are you still hunting for bad parts or are you done. I will wait till your done and look over what parts are needed.
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nashou
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Post by nashou on Feb 19, 2014 12:48:56 GMT -5
LOL, yeah help me out here. I can t find the originals with the 30ns recovery time. An the right amps etc. EDIT: no I was out restaurant shopping for things I know more about apparently Nashou |
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nashou
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Post by nashou on Feb 19, 2014 12:56:57 GMT -5
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Post by mastertech on Feb 19, 2014 13:27:59 GMT -5
I'll check in a couple hours. On my way out now.
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nashou
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Post by nashou on Feb 19, 2014 13:32:21 GMT -5
k
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