Hello,
I am having issues with a g&g prk9 and its related to the mosfet. It does a cycle of sometimes firing once, then a two round burst other times and back to once and so on beeping in between trigger pulls. This happens in both semi auto and full auto. I have seen a manual for a g&g mosfet mentioning make sure the battery is charged and also that it may be a sector gear out of place or something like that if the light on the mosfet is on. Also the seller mentioned trying to reset it but I dont know how and I dont have a tool to program it. Would I need a mosfet programming tool to fix this issue?
I just charged one and it did the same thing. Otherwise id have to take some of the gun apart to take a look at the mosfet. I have essentially no experience working on airsoft gun so im worried ill end up breaking it and it not working once I put it back together.
If its too much of a hassle I can always ask the person I bought it for, for a refund on paypal. One more thing thats wrong with it is the battery hatch doesnt wanna latch, unless I fiddle around with it for a minute or so. Something I was not aware of when I bought it, same with this firing issue but this part may be easily fixed idk.
I contacted him and he told me to take out the charging rod to see if its bent. I did and it looked very slightly bent at the end. Could this be enough to make the hatch not work properly? Its not a very noticeable bend in the rod.
Any advice on what is wrong with it? And should I think about returning it and getting my money back? I feel like I got it for a decent price but I wasn't planning on paying for a misfunctioning battery hatch and possibly mosfet as well.
How do I know the output voltage? Is there an equation or do I need to plug it up to something? And what makes it not a good pack? What do you recommend?
I've fixed this issue 3 times this year. At least the v2 type. Id imagine they are basically the same tho.
This issue is common among the older and newer generation of g&g trigger switch boards. The microswitches become crushed from the trigger and start acting faulty half the time due to crush damage.
To fix this issue you must replace the selector plate, trigger on the later designs - which they tried to change the trigger to a proprietary one that has a leaf spring to fix the issue, and obviously replace the contact board with a board mosfet or contacts.
I generally enjoy teching, but when I see something so petty like this so often it gets annoying to fix.
I actually still have all the g&g mosfets and trigger boards if anyone wants photos of them. One I took apart the contacts to see how it ruined them physically however. The plastic top that presses the metal button was flattened to the point it wouldn't activate.
This issue is common among the older and newer generation of g&g trigger switch boards. The microswitches become crushed from the trigger and start acting faulty half the time due to crush damage.
To fix this issue you must replace the selector plate, trigger on the later designs - which they tried to change the trigger to a proprietary one that has a leaf spring to fix the issue, and obviously replace the contact board with a board mosfet or contacts.
I generally enjoy teching, but when I see something so petty like this so often it gets annoying to fix.
I actually still have all the g&g mosfets and trigger boards if anyone wants photos of them. One I took apart the contacts to see how it ruined them physically however. The plastic top that presses the metal button was flattened to the point it wouldn't activate.
It sounds like it might be more trouble than its worth lol, I might just ask for a refund at this point as I didnt know about this as he said it worked fine, unless it somehow got damaged during shipping idk. Also seeing as I have basically no experience there might be an easier gun to work on.
Well, another alternative is fixing the microswitch with a new one.
If you don't have experience with aegs, including ak style v3 gearboxes then you'd need to find a tech with experience with aks. I've only opened the m4 g&gs, not ak's. I'm not sure if the ak variant is the same process or if it's proprietary.
The gun I made the post about, the g&g prk9 has whatever adjustable mosfet it came with stock which I would assume is made by g&g. I have another g&g with a gate titan however, but that's not the one with the issue. It's good to know it's just the g&g mosfet and I can use a different option if I'd like.
I always rewire my guns for 11.1v lipos, but then again I am comfortable repairing whatever damage it might cause. It can be a toss up though, because a stock gun may or may not be able to handle an 11.1.
Essentially, all a high output lipo does is increases the rate of fire and trigger response, sometimes at the cost of various internals. Sometimes and fairly rarely, it can result in arcing across the trigger contacts, but a simple mosfet would fix that.
You can look further into the possible internal consequences, like a prematurely worn piston or gear set, but most of these problems would be a result of everything moving faster, which puts more stress on some components.
The main cause of stress is pushing your gearbox to the limits with a high output battery, which a lot of us try to do anyway. It all comes down to wether you want your gearbox to fail after 10,000 unimpressive shots or 5,000 impressive shots.
The Gate AXR is a good example of a simple mosfet, is doesn't have any features beyond just protecting the trigger contacts and diverting more power to the motor.
Basic mosfets do two things:
1) Protect the trigger contacts from electrical arcing by only running a signal (very low voltage and amperage) current through them. When it senses that the signal circuit is complete (the trigger is pulled), it closes or opens (depending on the mosfet type) another switch capable of handling much more voltage and amperage.
2) Mosfets actually divert more power to the motor then standard trigger contacts, because the current no longer has to flow through the thin contact plates, which provide a little bit of resistance. The difference may not be noticeable in most builds, but it is there.
Mosfet chips are usually used in conjunction with shottkey diods and resisters to perform these things as efficiently as possible.
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