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What is this? Driving me nuts

shazz77

Jun 27, 2022
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Hey, Ive found this to be the faulty part but i cannot for the life of me find out what it is. Any help would be appreciated
 

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73's de Edd

Aug 21, 2015
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Is it "faulty" because its being "shorted" . . . . . as it looks like a ferrite / powdered iron cored inductor of ~ 4 turns of #18 enameled magnet wire, being wound at one end of it, then being black shrink wrapped. Then some nice illegible white symbolization of . . . . PA4-1027-? . . . .is being stamped upon it.
OTHERWISE . . .type of equipment being from, brand, model, what is whole boards function . .ya da ya da ya da . . .
 
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Harald Kapp

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, Ive found this to be the faulty part but i cannot for the life of me find out what it is.
How do you know it is faulty if you don't know what it is and what its correct operation would be?
There are no visible signs of a defect here.
 

shazz77

Jun 27, 2022
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I have two other control boxes that have the same board and they both measure 2ohms where this is open circuit. Sorry thought I added the other picture as well. It’s a bit hard to see but it has blown out the end of the component. It is a control circuit for a dc motor.
 

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Harald Kapp

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It's likely a 1 mH inductor like this one.
The value is coded in the "102R" part of the label.
 

kellys_eye

Jun 25, 2010
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it has blown out the end of the component.

Being a passive component it is not likely to be the cause of the fault - just the result of it...... Something else in the circuit has gone wrong.
 
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