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Old 09-17-2021, 06:44 PM   #22
CapLeaker
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Join Date: Dec 2014
City & State: Atlantic Canada
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Default Re: Catapillar ECU repair, need N548AB replacement?

The 3 pin caps measure about 1400uF on my tester. There are no ratings printed on these caps. It also seems these 3 legged caps aren’t connected to these TO247 devices. 2 of the pins of the TO247 go to the connector while the 3rd pin is just floating. Which doesn’t make any sense. It looks like it goes to a pad and a through hole that doesn’t come out on the other side. I’ve actually made a copper brush to my DMM to find a pad where it comes out but can’t find anything on either side of the board. While pin 2 and 3 of the two TO247 devices are in parallel, pin 1 is separate which I believe is the gate pin. Sine it isn’t connected anywhere it must be floating. Even my dog thinks I ate her kibbles. I’ve made a pic from the other side of the board. That’s where I left for tonight. Maybe I’ll have another go at it tomorrow…
I know the ECU is from a Catapillar MXS maybe a C15
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Last edited by CapLeaker; 09-17-2021 at 07:06 PM..
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