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Post by Bishop (Task-Force Nightmare) on Aug 2, 2013 13:38:20 GMT -5
I have an ASCU mosfet that has been causing me trouble lately.
I would like to remove it but, I want to do it safely without messing anything up. It is hardwired to my gun. Would it be as simple as to just de-solder it and solder the wires back together or is there more too it?
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Post by X on Aug 12, 2013 10:16:31 GMT -5
No, you need to replace all of the wiring. Open the gearbox remove all the wiring and run new wire in a standard configuration. The current wiring is too small to hack it into working. You will melt the wiring if you tried to run all of the current through the old trigger sense wires.
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ctres
New Member
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Post by ctres on Aug 12, 2013 12:24:52 GMT -5
X, I think he is asking whether he can just cut out the fet from his existing harness and solder the ends back together. If your fet has the gate wire running to the trigger switch then the answer is NO. If you look at the wiring of a proper mosfet it will appear that the battery is more or less wired directly to the motor with the exception that the fet itself is wired into the negative side with the gate wire going to the trigger switch as well. The fet senses when a circuit is completed between the gate wire and the positive side of the battery, and then allows current to flow through the main wiring via solid state switching. This is why you have the two positive wires stacked on one of the switch terminals and not running through the switch. If you were to just cut out or desolder the fet and reconnect the wires that had been going through it, then your gun would fire continuously right when you plug in the battery. I don't remember how to the ascu is wired, but it should be something like I described above. I would do what X recommended and just completely replace the harness rather than have multiple solder points anyways. Edit: www.airsoftgi.com/mobile/product_info.php?products_id=9191If this is what you have, then no, you cannot just desolder and reconnect the wires. |
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Post by X on Aug 12, 2013 13:00:01 GMT -5
I wasn't 100% sure which is why I explicitly listed the necessary steps. Now that I looked at the OP again, I agree with you. I'll edit my post.
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Post by Bishop (Task-Force Nightmare) on Aug 12, 2013 13:19:54 GMT -5
I did this the other day. I only cut the fet chip out of the equation and indeed the motor continuously spun and the gun kept shooting. And there are other multiple black wires going into the gearbox. I personally am not comfortable doing this job by myself so I will probably be looking to get some tech work done soon. I did however resolder the fet chip back to the wires just so when someone else does this tech job they'll get the whole kind of picture.
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Post by X on Aug 12, 2013 14:57:36 GMT -5
Yeah that's expected. There is a way in which you could wire it so that it doesn't continuously spin, but you would melt the wires. So don't do that either.
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ctres
New Member
Posts: 955
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Post by ctres on Aug 12, 2013 21:46:07 GMT -5
If you can solder then you shouldn't have an issue putting in a new wiring harness. It isn't really hard at all, you just need to know what wire goes where.
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Post by Bishop (Task-Force Nightmare) on Aug 12, 2013 21:58:38 GMT -5
Yeah I don't really know much about re-wiring a gearbox so I don't trust myself to do it.
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Post by X on Aug 13, 2013 8:06:49 GMT -5
It's pretty simple. Just look at a picture of a gearbox online. There's only two contact points in the gearbox to solder.
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