I think I remember something that I had to rebend the auto tab on the switch, but it's so far in my mind I can't be sure...

Now problem still arrive... I cut the sp enuf not to engage the cutout lever, try shooting in semi mode but there are no single shots... Sp was touching 2 prong springs. All fired in 3 bursts.. After about 5-7 pull it just double beep & stops..

When in full auto the gun just cycle once than stop... Sp was touching all 3 prongs & not engaging cutout lever...

Still can't determine whats wrong...

1 quick question: does the cutoff lever engage from the sector gear does a big movement on the ascu sensor arm? i mean does the sensor arm move all the way to the highest point or the cutoff lever should just engage half of the sensor arm?? & what does it means when one should get a better cutoff lever?

my m4 still not shoting any semi in semi mode.... & no full auto, just 3 burst in semi mode... i've done all the nessecery adjustment on the new Guarder selector plate, but no luck...

According to the manufacturer, here are the dimension:
L = 5.2 mm
W = 2.0 mm
H = 1.2 mm
If anyone's interested.

I just installed one of these new ones on an m4. Had to replace the cut off lever but after that it will cycle in semi fine but on auto it only cycles once as if it's still on semi. Any ideas?

your selector plate is still contacting the cut off lever in F/A. you need to trim a bit more on the selector plate

Actually, I think it is more the third contact on the switch (The long one), outside the gearbox isn't touching the selector plate's metal piece, so it thinks it is still in semi. Bend it towards the outside of the box a little so the SP touches the contact arm.

but if it thought it was in semi, it wouldn't it continue to cycle in semi? since the cutoff lever should be able to move freely in both positions, it should act exactly the same as if the 3rd contact is not engaging the selector plate.

Well, if it doesn't buzz and still does semi shot after shot, it's the 3rd contact arm, otherwise, if it does one single shot and then buzz, it's most likely the cut-off arm, IMO...

is the below true??

I'm still trying to understand the whole relation between the SP + cutoff lever :

• Semi mode: SP touches 2 prong lever spring & not engaging the cutoff lever, cutoff lever moves freely??
(my case its shooting 3 burst in semi mode...)

• Full auto: ?? SP touches 3 prong lever spring & engage the cutoff lever, now the cutoff lever is being push by the SP to the top max??
(mine is not shooting in full auto - my SP not engaging the cutoff lever at all...)

The SP shall never touch the CO lever with this unit. If your semi shoots 3-round, most likely the 3rd contact is touching the SP, and needs bending away from the SP.

OK, that make sense..

Now lets go the the sensor unit... Inside the gearbox, the cutoff lever engages the sensor (dark grey color) arm by the sector gear's cycle, the cutoff lever's arm go almost at the sensor's highest point, leaving almost no gap it this point of the cycle... At the idle state the the cutoff lever rest with about 15mm gap from the sensor arm.. Is this correct?

Hello Gents.

I have the 1st generation ASCU and it works like a dream.

I have now installed the 2nd generation ASCU and am having an issue on semi auto.

The gun will cycle once or twice before stopping and seems to seize up. But once I put it into 3 round or FA, it works fine?! Once I have fired it on 3 round bursts or FA, I can again cycle the gun in semi once or twice before it seems to get confused.. If i keep pushing the trigger enough times it will do a full cycle.

So..

I figure its not the battery or motor as it shoots perfectly on 3 round and FA.

Is it the cutoff lever or selector plate? or is it something else? Has anyone else had a similar situation?

I haven't seen the gen 2 yet but it would be the same process as the gen 1.

remove the spring and cycle the gears. watch for switch and cutoff lever movement. do the same thing watching to see if the cutoff lever contacts the selector. check the 3 leaf springs on the back of the switch for proper contact with the selector plate.

I had to mod my selector to reliably get semi & auto to work as selected. When I went from safe to semi I had nothing. Move a little past semi and it engaged ok. Full auto at times worked. What I did was pull the metal off the selector plate and shave down the end towards the front of mechbox and slightly trim the metal so when I put it back on the selector plate, the metal was about 0.5mm closer to rear of mechbox. Now all modes engage properly.

I just now should replace the motor with a high torque one to help with braking. It at times over runs after burst holding nozzle pulled back.

KWA SR 7 with ASCU v2 fire select issues
 

Problem: Fire select lever in SAFE, it fires a single shot.
: fire select lever in SEMI, It fires a single shot.
: fire select lever in AUTO, It fires 3 round burst.
: Return fire select lever to SEMI it fires 3 round burst.
: In mode 3 (single fire 3 round burst)

Does not malfunction when the gearbox is removed from the lower receiver.

I have put electrical tape on the inside of the lower receiver where the 3 exposed contacts may touch the receiver and on the two exposed parts of the contact on the selector plate. Disassembled and reassembled many times.

Anybody have similar issues or any insight to what could be the issue??


I am new to the forum.
First AEG...KWA sr7 with ASCU gen2. Very resilient MOSFET. Want to upgrade when this issue is solved.

Might looks like your contact plates on the switch are too bent, or the gearbox isn't sitting where it should, and the SP is not in proper position due to that.

KWA SR 7 selector plate tolerance
 

Looks like the tolerance between the selector plate contact is really close to the contacts to the ASCU contact pins. I didn't want to bend the pins so I pushed the contact on the selector plate as far forward and than puta drop of C.A. Glue to keep it in place.

I also put a small bead of C.A.Glue on the right side edge of the selector plate contact.
Gonna see. Hot that works out.

Thanks for the input Audi_Bhoy..

GRRR....Just installed a Gen 2 and when I powered up for first time it beeps to signal that it is ready, then does nothing. Nothing in semi or full auto. The metal of the selector plate is obviously connecting the 2 and the 3 lamellas.

Anyone know what is going on here?

Communication problems between the sensor unit and brain usually means one or more contact pins on the data cable connectors (either end) are either damaged or come loose.

There are 4 wires on the data cable, each wire is a signal for one of safe, semi, 3round burst and full auto.

If the brain successfully beeps the motor on startup but one or more fire modes are not working i would be looking at the data cable before anything else.

Thanks, Duy. I will try another data cable.

Well, a new data cable fixed the problem. I believe the original was defective. I was so very careful with it, I cannot believe I damaged it. However, I do read that they are very delicate.

Hi everyone, question for you : Ijust installed an ASCU with the trigger and everything but the ASCU does not detect full auto, only semi, which means I only have semi auto available and can't program any other mode (only the the empty mag detection).
I folowed the manual except for the inner sticker I didn't have in the box.

Any ideas ?

Sticker should have been in the box, at least I had it when i gave it to you. Might have fallen somewhere, oh well, just make sure it wont short on the body :P

I don't have as much experience as you but is the cutoff lever moving freely? What about the contacts, are they meeting correctly?

Inner sticker? You mean the bit they say to cover the selector plate to prevent contacting the receiver? Use duct tape on the receiver.

If it doesn't respond to full auto, ensure you trimmed enough of the selector plate. As you manually cycle the box without the spring in, make sure the cutoff lever doesn't touch the selector plate. Did you remove the cutoff lever spring?

Fuse necessity? If so what is the recommended.
 

My ASCU v2 did not come with a fuse. There is no mention of it in the manual.
What has been the norm with using this MOSFET? A little concerned and don't want to destroy this thing.

I don't believe there is a fuse for the gen 2

try check the wires? if u did a cut maybe the wires aren't soldered on properly, i have the gen 1 installed on an M4 with a collapsable stock and that was a total nuisance for the gun doc, apparently one of the problems mine had was that so yer no idea tho bout the gen 2 ones still have to buy a few to try out :)

Cut off lever is springless and I believe I cut enough, yet selector is very hard, may have done something wrong there.

If everything was done correctly but it still won't shoot full auto, it could be that the ribbon cable is damaged or isn't plugged in all the way. Either try cleaning the connector or replace with another one.

oh...I think I'm going to need some help too.

I installed it, re-installed it, and re-installed it again but the probelm of mine won't fixed.
My problem is now, it's won't shoot semi. No matter what I do, it shoots only full auto.
First off, it doesn't wanna go into the progamming mode at all. I only hear a beep when I pluged my battery and no more beep. It just keep shooting.
Can anyone give me an advise me on this? or is there any available Gun-Doc who is very familier to ASCU V2??

Forgot to mention it, it's am MP5A4.

Ryan, have you taken a look at the contact points of the ASCU and the selector plate if everything was in order?
If I'm correct, when on safe the selector plate shouldn't make any contact, in full it should contact all 3 points. I'm not sure on Semi though

That's the biggest problem for me. Because I can't see where the selector plate is...I've tried look at it, but impossible..if it was M4, I'd just try put only the grip on the gear box and test it out but since it's MP5...I can't do that either.

Oh, I don't even know what the Mp5's GB looks like, sorry I can't really help you on that matter then :/

It's same v2 gearbox bot on a different body and using a different selector plate..oh lord..

I'm looking for a Gun-doc who can properly install my ASCU~! I'll pay of course.

I don't have the ascu2 but my mp5 install with the original ascu went in smooth as butter. I did have a small hiccup with the selector plate but that was easily remedied with a new one.

Ryan, assuming you followed the instructions, did you mod the gearbox at all near the selector plate? Is there 100% clearance from the contacts and the gearbox? Double check that the outside of the selector plate is also insulated from shorting out.

Btw, I haven't looked at my mp5 in a while, nor do I know much about the version 2 programming.

@ ryan, are you programing it correctly? Plug in battery, wait 2 second and flip the selector to full auto and pull the trigger once. Then after that you'll hear the beeps for programing. Read over the instruction manual for programing and trouble shooting. But it does sound like your selector plate is not in the correct position. If you have another selector plate, swap it and try again. Also try moving the safety lever is a half position (between fire position) and see if that works. If it does, then it's your selector plate.

Good call HKGhost. I remember having that issue with my m4 because of a mechbox/receiver fitment issue. Was only out a couple millimeters but prevented proper firing.

I forgot one more thing, check the cutoff lever. If the lever is not raising high enough to engage the cutoff trigger switch, you won't get semi fire but only full auto. Either replace the cutoff lever or bend it so it raises higher when the sector gear engage it.

@ coachster, yea I've see this issue a lot with cheaper gearboxes. It can make you go nuts when it's just off by millimeters.

I'll try them all out again on this weekend. But first off, it doesn't even start the program mode when I plugged the battery on Safe nor I never programmed it.

@HKGhost, if I send you my gun, can you fix it? I assume you're from Airsoft Parts Canada.

Give it a try and see what you can do, it all fails, then yes you can send me the gearbox to look at. My only concern is the actual mosfet and if it's damaged or not. I won't be able to fix it if it is. Also look at the ribbon cable to confirm there's no damage to any of the wires. That could also cause your issues. Let me know now it goes and PM me.

I just shredded my wires that lead to the motor on my 1st gen ascu and I need to know what's the best way to fix that?

You can splice in any low resistance wires to the motor. I highly recommend soldering(avoid cold joints) them instead of just twisting and taping.

Also avoid any solid core wires.

Getting frustrated by another of these. This will be 3 out of 10 or 12 installs. That is too high a rate of failure!

This one seems to have no active braking. It fires once, over rotates and double beeps and shuts down. I have already changed the data cable once. I tried it again with a anti-reversal latch installed. It just over-rotates and shuts down with the thing locked in a half cycle.

Checked the cutoff lever (it is brand new, as is the sector gear) and it moves the ASCU switch far to the top.

Does anyone know what is happening here?

Hello,

I have problem with my ASCU2. Everything is done according ASCU manual.
I think, I have problem with gear timing, my air nozzle does not stop in normal position - backward, it stops in middle position (nor back or forward) and AEG observes lost of FPS. With stock parts I have no problem. As i know, after semi shoot, nozzle must be in back position.

this is video of sector gears cycling by my hand.
Movie.wmv - YouTube

As you can see on video, I think cutoff lever activates sensor earlier, breaks circuit and nozzle stays in wrong position.

Is any suggestions?
thank you

the cutoff lever appears to actuate normally. the sector gear is in the proper position when the cutoff moves and resets. you are using the proper tappet return spring?

can you take a video of it with the upper receiver off?

This is email from airsoftsystems support, replay about my problem.
But I have g&p m180 motor, which is stronger than systema magnum.
also, I tried with ARL, but without success.

coachster
I am using stock tapet plate and spring. I will assemble AEG and post video again. Thank you for replay.

At first, I thought it was slight over spin from a lower torque motor but since you have the m180 it's hard to say now.

I use the G&P m170 with good results in my M4 but in the MP5 I am using a stock JG high torque motor without issue as well.

I'm at a loss as to your compression issues. You could possibly contact Jugglez for any insight.

Very strange, I am one man in the world, who have this type of problem with ASCU. Google says nothing :)
I will drop it in trash and will live calm :D
I am tired from assembling/disassembling gearbox many times.

coachster
Thank you for attention

Use the M-93 Motor from ebairsoft.com, low cost, high magnets, and powerful enought (would cause overspin without the ASCU in single shooting)

OK, I made some modifications.
Problem was in air leak between air nozzle and bucking.
Tappet plates (it is new) front side was bent to back and air nozzle does not moved enough to forward. I've heated tappet plate, made 90 degree of front side of tappet plate and air nozzle goes far of.
Also, i've increased length of hopup spring.
After this modifications FPS is increased from 440FPS to 482FPS. This result is with Guarder SP140 spring.
I will research further, because I think currently it have air leak also, because with SP140 it is bad result.

I did just that and when I plugged in the battery, the motor constantly spins and I hear no beeping. Somehow I think I fucked up the control unit.

Where can we get replacement data cables?

Connectors
 

You can get part H1565-ND for the connetor and H1577CT-ND for the pins from digikey.ca to replace the connectors.

The pins are a pain to fit, so order 100 to make sure :)

Just

or u go to airsoftparts.ca and just order a new data cable that will fit without fucking around with annoying small pins that break lol...

Dude, tone It back a bit. Take a look yourself at airsoftparts and try to find it first.

ok ive red through most of the thread and seem to find the answers but their not working

i just installed and im getting over spin on every motor i have in full auto and that makes it do a quick click and then stop, it worked fine first mag (60rds) than it started sounding funny after i plugged battery back in to change mood. the beep sound went from crisp to scrachy and the ab doesnt work, i have changed lipos and tryed all the moods
i have
matrix turbo
g&p 120
aim f430 spider torque motor
aim f430i high speed
stock j motor

no matter which one they all over rotate

That micro switch looks fragile. What are you guys doing to prevent the trigger from breaking it if pulled too hard?

After my TM stock trigger contacts took a shit on me a few months ago I decided that it would be a great time to buy the ASCU and try it out.

Ever since I have installed this thing my rifle has not been useable. At the same time I was also posted away to go on course and I am finally back in a situation where I have my rifle again and can try to get it fixed. Getting it fixed is top priority for me right now since Echo1 shit the bed with the trigger design for the M240. I JUST replaced it and it broke again before i could even fucking game it >_>

I NEVER had ANY problems with the rifle until the trigger contacts bit the dust.

The problem: Shoots once or twice then gives me 2 buzzes and does not shoot again unless I re-connect the battery.

According to the manual this could be a few things.

1. Tight shimming
2. Motor too high
3. Poor battery
4. Weak motor
5. Broken gear
-----------------------------
1. Gears spin freely, even tried shimming them loose.

2. Tried every height setting, even removed the highest adjustment compleatly.

3. Tried with multiple charged batteries, all 9.6V and one 7.4V 20C Lipo.

4. JUST replaced the stock TM EG MAX Hyper 1000 with a G&P M120 today.
Gun is only shooting 350 FPS on 0.2g, so not a very strong spring anyways. It was shooting 380 when I bought it back in 2008.

5. Gears are fine.

This is really pissing me off. I would like to see the ASCU work but if I have to go back to mechanical trigger mech I will.

Did you check to make sure that the cutoff lever is tripping the unit? Some cutoff lever (worn ones) won't go up high enough to trip the unit in SEMI. Either bend the cutoff lever (if it's steel) so as the sector gear goes around, it tips the cutoff lever higher, or get a new one.

How high should it be going up?
Its moving a good 4mm ish and was tripping the mechanical trigger mech just fine.

I would assume that the unit would not stop spinning the motor if it was not tripped by the cutoff leaver.

I had the same issue with mine and the issue was a worn down cut-off lever. I would get and new one and try that.

Just fine isn't good enough. The lever on the trigger should go completely up. You're getting off a few shots then the unit realize there's nothing tripping the unit off, so it goes "beep" then shuts off. I've see this many times now, and most of it was due to worn cutoff lever, or it wasn't tripping the unit off.

Don't use a prommy cut off lever though. They're too big and will snap the sensor arm off.

I ordered a modify, see if it works.

Installed the new cutoff leaver. Did not fix the issue. Comparing it to the stock one in there, the stock one does not look worn at all.

ascu mosfet motor and mosfet getting warm
 

just a quick question guys. Is it normal for the motor as well as the mosfet to get warm? it's a brand new ascu. it works fine but the motor and mosfet itself gets warm during cycling.

Warm, yes
Hot, most probably
Hot so you have a hard time holding it in your hands, not at all

If it gets to the point where the comp shuts down from overheating, you have a problem

heres my setup. i'm running an 11.1 20c lipo along with the amp T5000L high torque motor.i bought 2 brand new ascu mosfet units. i installed one and it was heating up the wires,mosfet and the motor as well, starting from the battery wires and moving down into the mosfet and motor. i originally thought it was the ascu mosfet kit being bad, so i replaced it with another brand new one. i made sure to be extra careful on install and double checked everything. everything works awesome, but once again the wires and mosfet, as well as motor is heating up. not smoldering hot but warm enough to notice. once it heats up i stop operation. should i swap the small tammy for a deans? should i try a different motor? i'm lost at this point.

i'm just on the fence here with mosfets. it's the first time ive used one, so i don't know if it's normal to heat up, or if something is malfunctioning. i could see getting one bad apple out of the bunch, but 2 is very unlikely.

What gauge is your wires and what connector do you use?

My ver. 1 the motor gets pretty warm under lots of semi shooting. The main unit seems to stay ok temp wise. My wiring is changed from the board to motors with the modify low resistance wiring (my version had the bad wiring insulation & jugglez gave me some wire to fix mine up)

Semi shooting causes more heat to the motor as it constantly starts and stops, compared to auto shooting. I didn't read the entire post since the last time I wrote in here, but what about your gear shimming and motor height? (If you didn't state these earlier....)

mechbox is shimmed nicely, gears spin freely with little to no wobble. motor height is good no whining or grinding. as for the gauge of the wiring it came with 18 awg rated for 200 degree wiring. it's the newest version from ascu. heres a link of the mosfet : http://www.airsoftgi.com/product_inf...oducts_id=9191

if need be i can re-wire it to deans, but as of now it's wired to a small tammy. would re-soldering the board to low resistance wiring help? i mean it says it's rated up to 12v.

Try a different motor. I'm not familiar with that amp T5000L, but if it's a power hog, you'll get a hot setup. I've worked on a gun running Systema Magnum motor and that got everything really hot. Too hot to handle. So check that out as the wiring should be good enough, but do upgrade to Deans.

swapped it to deans, i don't know which motor will be compatible, because the unit needs a good motor with strong magnets. i tried an echo1 brand new high torque and the system would function at all. any suggestions on motors with strong magnets that aren't power hogs?

I have had great luck with Guarder's Infinite Torque-Up Motor. It's a beast of a motor but without sucking your battery dry. Another option is the SHS High Torque motor. You have a higher chance of getting a lemon comparing to the Guarder, but it's a pretty decent motor if you're not pulling a super heavy spring.

thanks for the input on motors. as for spring rate, i'm only running an m115. im using it for a cqb weapon and only using semi. i will try a different motor. right now i'm right at field limit, 398-400 with .2s. i had a couple spike at 405-406 but most consistently was 398-400

Hi

So my team mate and i ordered our ascu's it will be here in the next few weeks.

im planning on putting it into mine into a magpul masada. and his into a king arms magpul m4.

both are front mounted and well mine has a plastic selector.

i was wondering if anyone else has done it to a masada?

thanks

Hello all,

I recently purchased my V2 ASCU and promptly installed it in my airsoft rifle. I broke off one of the wires on the data cable. I did
manage to solder it back on, but I was wondering where I could get a cheap replacement. (Ribbon connecter at a local Computer store maybe?)
I have another problem too. When I fire the weapon in semi or auto, the action cycles once then double beeps. My shimming is good, and I'm running a G&P M160 motor powered by a 11.1v 1000mah 20C lipo battery. My cut off lever engages the cut off sensor when I turned the sector gear. The selector plate isn't in the way and has been cut down to spec. I can't think of any other solutions.
Please help.

What spring are you pulling? The G&P motors aren't as strong as you'd like to think.

I'm using a systema 140 spring. Gears are from a guarder 150 FTK.
The weapon can completely fire one shot, but then the ascu double beeps. I have to unplug the battery and replug it in order to get another shot off.
I'll try to run it with a 120 spring and see if it works.

Anyone knows of a canadian retailer that has these units in stock? Can't seem to find it anywhere...

I'm currently pissed off at my ASCU gen2 .
I installed it shimed my gearbox perfectly .
And when I try to shoot it it doesn't one perfect cycle the it stops
I got a new cut of lever .I checked if the cut of is tripping the sensor
And it is but I notice there is like 1-2mm of extra movement .
I'm wondering does that sensor have to be tripped all the way up ?
And also I'm thinking as well the ascu sits kinda loose in the mechbox . Can that be a problem as well .

If anyone can help me on this plzz send me a msg .

Did you cut the selector plate properly?

On my side, currently waiting for my GEN 3 to come in, the one that all fits in the gearbox with the empty mag hop-up unit, can't wait to see how it goes !!

Yeah I believe I did . The selector isn't having any contact with the cut off

The unit must be beeping when it stops? Last time I had a problem with the ASCU I've been able to pinpoint the issue according to the beeping chart provided by Airsoft Systems.

Im picking one up for my new build as well, imo they copied the raptor microswitch design and the hopup unit thing sounds gimmicky but if the hopup detection thing fails ill just install the unit alone lol

Being all in the gearbox, it allows to rewire to the front much easier I guess too. Hopefully the hop up unit doesn't fail either !

The ASCU hopup and bolt catch system is terrible and there have already been many reports of failures on other forums and their own FB page. The plastic they use for the hopup is very weak and the "ring" at the front snaps easily when installing an inner barrel. Also the switch for the bolt catch is super fragile and mine already broke within a few presses of the bolt catch. Still waiting for AS to get back to me on this.

As for the ASCU itself the trigger response is MUCH worse with the Gen3. Myself and several others have confirmed its not possible to fire more than 5 shots/sec on semi no matter how quickly you tap the trigger, which defeats the purpose of the feather trigger in the first place.

Just a heads up for you guys.

Just got mine too, seems that I'm missing half an inch on motor wires, and it required dremeling into the gearbox. I also need to find a new bolt catch since my customer had the classic army with the arm under the gearbox, and I don't want to destroy it so the switch would work.

EDIT: Everything is now installed and ready to go, but whenever I try to take a shot it will shoot once and beep twice. Either underpowered battery (Tried 7.4V and 11.1V Lipo, so it ain't this), bad shimmingonthe gears (Modify all stuck together gearset, not much chances), overtighten motor (tried even when unscrewing bottom motor plate to allow more play, no chance either), so the last option could be an underpowered motor... Will see after swapping this one if it helps...

Not impressed so far by the Gen 3...

EDIT 2: Still not working, shoots once and double beeps, tried a high powered magnets motor, still no chance. I wrote to airsoft system as it just doesn't want to work at all...

ASCU Gen 3 = Junk
 

I have installed the ASCU in my G&G TR4-18 and I agree... the semi-auto trigger response is terrible! I have talked to quite a few people who are noticing the same thing. Did they not test these before sending them out? I contacted Airsoft Systems and they told me to send it back and they would reprogram it. NO! You send me a new one and I will send mine back then... I don't want to go 3 months without my gun because your product sucks! I was also told to try a better motor, but I am running the G&P 120 right now. I tried an SHS High Torque and didn't notice much of an improvement... has anyone else? What about a Systema Magnum motor?

ASCU problem
 

I have been repairing my friends two M4's (G&P) stubby killer/Special force (or something like that) Only thing i can say about these ASCU's... Horrible. Now i managed to get the stubby killer working, but i still got problems with the other one. The fires OK when its on semi, but when i move it to auto it stops firing. When i put it back to the semi it fires one shot when i switch Auto to Semi. I have checked wires like 50 times and they are ok. I was wondering that can the Cutoff lever cause the problem? It was firing ok some time ago but i had to open it because those crappy wires where ripped off.

My Gen 2 just decided to lock itself open, I cannot figure out how or why... I just replaced the motor wires, everything is pristine, the only knick in that pesky data cable has been soldered and covered.

What bugs me most, is that I plugged it in, tested it, worked 100%, rebuilt the entire gun, fired 2 shots and then it locked on, had to rip out the battery because I know what would happen next if its a short. Unit was quite warm, wires fine, no shorts. So did my unit burn out and lock on?

Anyone had this happen before?

Sometimes it just happens, electronics wear out just like everything else in life

For all the V3 ASCU users, quote from their FB Page:

"At the moment we are preparing the Free Upgrade kits for ASCU Gen3 for gearbox v2 to Gen3+ including parts and instructions, we will prepare also a video showing how to upgrade the unit. When the kits are ready we will announce it here and on our official webpage how and from where to order them."

"ASCU Gen.3+ is out

Dear airsoft fellows, we used all the feed back we got form our customers regarding the ASCU Gen.3. The reported issues were related mainly to a lag in the Semi-Auto function, during fast follow up shots, which was the result of software monitoring of the system. Other report were regarding problems in installation especially in reinforced gearboxes. Also we found out that there is a large percentage of our customers that install the unit without reading the manual, as for different reasons main of which is that not all of our customers read English.
As devoted airsoft playes ourselves, we felt that it is out duty to improve our product to the likes, needs and skills of our customers, to make it faster, safer, easier to install, and almost impossible to burn. The result is the ASCU Gen.3+ for gearbox version 2.

What is new in Gen.3+

1. Added polymer padding to the circuit boards, protecting them from
damage during installation and use.

2. Short-circuit check software between each shot is removed and now
the Sem-Auto is as fast as one can tap the trigger.

3. New Cut-off lever and selector plate designed specially for the
ASCU.

4. No need to dremel or modify the reinforced gearboxes.
5. New thicker wires.
For all our customers who have the ASCU Gen.3 with the trigger lag, we will prepare free upgrade kits, that will transform the ASCU Gen.3 into Gen.3+. They are going to be available through our distributors and dealers.
We will keep working for you guys, doing our best to bring to the airsoft community, products that have been designed by airsoft players in the field."

When I bought it, than work perfectly (V2.2). I loved it. After three skirmish the data calbe damaged. One of four calbe was break away so I ordered one replacement calbe from RedWolf and replaced it. It's work again, but in use the motor's negative cable was damaged. I replaced the motor cable, it went to work again. After few game the motor's pozitive connector break so I need to replace the whole cable of my ASCU. After replacing it went to work again. I could play on few games again, but my gun's gearbox damaged - the piston was break. I changed the piston and the ASCU's data cable but it didn't work.

When I connect the battery it's going to work. I hear one beep and the ECU wait for work / use. When I pull the trigger the ASCU made one cycle and stop working with two beep (sometimes it didn't give two bee fault code, just stop working). I check the manual about two beep fault code. I checked the gears, work smoothly. I checked with few battery (two of different 7.4V LiPos and with one 11.1V LiPo). I tried it with four motors (TM EG-1000, AGM High-Torque, Systema Magnum, Chao-Li Normal) but didn't work after one cycle. I tried the gearbox with the original switch and work smoothly. The programing mode is working, I can change to all four working mode

At last I tried to use the ECU without gearbox. I put together the trigger switch, MOSFET-unit and the motor - without piston and spring. It made same when I use in a complete gearbox - made one cycle and stop working.

My ASCU has absolute same problem:
Ascu problem Please Help - YouTube