A&K PTW issue
 

Hi

i'm not a beast in electricity so i need a confirmation. after receiving my A&K ptw m4a1 i tried to function check it by pluging it with my 7.4v 2200mah 25c batterie and.......nothing!I also tried the bolt catch to be sure it was not me but after testing it with my multimetre she work fine.

i tried troubleshoot more the gun and when i've looked at the ''mosfet board'' look what i've find!
http://imageshack.us/a/img14/3658/32hi.jpg
http://imageshack.us/a/img191/4543/402v.jpg

the weld is broken. if i'm right it's why i can't fire the gun.
What are my option?FCC mosfet? flush all the ''electronic'' for new FCC or systema part?
I they'r a gun doc near Longueuil that would like to help me?
Every thing else is correct and i will make a review after the gun work.

kevin

From my understanding if yu got this from huang they require a 11.1 lipo or a 12v nimh. Apparentlu they shoot real hot stock.

The A&K board are not LiPo friendly, there have been documented issue about their electronics burning out even with a 7.4V LiPo

yes i know i have order a 9.6 systema ni-cad.
but it's doesn't explain the mosfet broken weld....

actually I've seen their soldering popped off from voltage spikes

so i need to flush everything and replace by new and better electronic?
or i weld back and see.

Well that depends how bad is the board, if its bad one of the things you can do is upgrade it the cheapest option is for you to find a CTW board, Systema and FCC would be about half or maybe a bit less than what you pay for your whole gun. when you do upgrade the electronics makesure you upgrade the selector board and the boltstop/EL001 together as some may not work with the other brand. The one I saw in HK a few weeks ago was so burned that half the board was black (they used a 14.8 Systema LiPo)

I must say i don't really thrust a&k board..even if i repair this section, maybe another one will blow someday.
Well i just look to order the FCC mini mosfet/FCC Advanced CPU/FCC Selector Switch Board.

the selector board should work with the Cpu since it's made by FCC?
i will look for systema.

No FCC has nothing to do with A&K electronics, also A&K motor is slighty larger than Systema and FCC so the oem grips might not fit if you choose to upgrade the motor.

no i was talking about the compatibility of the FFC selector with the FCC cpu

If you are going to switch to FCC
you need to switch all 3
CPU, Mosfet and selector
The selector boards are wired incorrectly, you can rewire them if you can solder fine points

The electronics are also a huge downfall of this A&K, I have added heat sinks on a friends because they copied 2007 systema boards which aren't Lipo friendly and they don't have any way to dissipate the heat. Which will break solder points and is a strong hit or miss

Carefull I wouldn't even attempt on resoldering the boards, so far in the A&K I've seen there is three different color ECU board Black, Blue and a purple version. The one I witness in HK that smokes up is teh Black and purple version and even then the two boards are not the same. For the price that these are selling they are still a bargain it's just that it's a pain in the ass to make them work if you have a off spec ones. I have two of them in my bench right now one was bought recently an dteh other was purchased three months ago from HK the boards are different and the motor is different one from HK has a shinier almost chrome liek motor while teh other ones looked like an old school 480

I would call that board toast. It is the same problem that Airsoft Surgeon boards used to have. They had no low-voltage protection, so when the voltage dropped from a depelted battery, or if you used a 7.4V, the motor would draw more current. It is a destructive feedback cycle, and the excessive current burnt out the trace.

You can try to fix it, but it will always be weak, and will blow out on you again.

If A&K is compatible with Gen 3 Systema electronics, I have a bunch of those kicking around. No idea though on how many actually work.

sound logic mcguyver.
it look like a design problem.
is theyr a way to know if a&k is compatible with gen 3 systema?

You would really have to try it. No better way to know.

Ok. But basically if I swap all rhe electonic board it should work?

I would really have to see it to give you a definatlive answer. Gen 3 Systema electronics are not the ideal solution, a better solution would be Gen 4, but the electronics cost even with a VUK would exceed the cost of the A&K gun entirely.

It is a difficult choice you face.

Yes....I really dont know what to do..
I fear that im stuck with a gun that worth nothing. Thats why I think to modify it complet fcc electronics (mosfet, cpu board, selector board) and try to keep the stock motor.
I would loke to put 1700-2000 on a systema but it no where to happen.
350-500 $ of part is still cheaper
I just need a bit of help and guts.

Well, even FCC electronics would cost you $300. And this assumes that your motor is fine, and the gun will work fine after the new parts are installed.

here some picture and dimension of the ECU /bolt stop switch.
maybe it can help to know if aftermarket will fit.
http://imageshack.us/a/img593/3705/vqfe.jpg
http://imageshack.us/a/img10/7050/lfir.jpg
http://imageshack.us/a/img534/4521/srwq.jpg
http://imageshack.us/a/img43/9742/7iyj.jpg
http://imageshack.us/a/img837/1369/vrs9.jpg

Well, I can tell you right now that it is not compatible with Sytema Gen 3 electronics. They use a 3-wire cable to control the FETs. Gen 4 uses a 4-wire.

It is not the dimensions, it is the programming of that board, the voltge and polarity in an out and selector interface that will be the issue. Odds of compatibilty are not good, and nobody wants to blow up a $150 Systema FET board or an FCC for that matter trying.

By the looks of it you got the blue ones, they are a match for the CTW, the black ones are a direct match for Systema Gen3 and the purple are also based on Systema but slightly different. Brad is right no matter what you system you choose in the end it will run you more than teh cost of the whole gun and another issue you will face is the motor if your motor is teh exposed core version you might want to look at a new motor to go with the new electronics.

http://imageshack.us/a/img829/9946/1qh9.jpg
http://imageshack.us/a/img11/272/cx6d.jpg
http://imageshack.us/a/img341/2515/hz0h.jpg