JD8825 Posted January 30, 2016 Share Posted January 30, 2016 HI have recently bought the rifle above and I have charged my 8.4 numchucks so they are ready for skirmish. They are both fully charged and when I connect it to the gun it won'the fire. And when I open the but plate there is a light that flashs red. Down the stock tube where the mosfet is. Any idea why this is? Thanks in advance Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 30, 2016 Supporters Share Posted January 30, 2016 check connectors on motor carefully undo the pistol grip plate somebody had a FFR 2 - similar 3rd burst gun and they had one of the motor connectors come loose inside grip Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted January 30, 2016 Supporters Share Posted January 30, 2016 Take back get a refund buy a brand of gun that doesnt have lots of issues at the moment. Anybody else think G&G should give up on the electronic gizmos and go back to basics. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 30, 2016 Supporters Share Posted January 30, 2016 Think its either people pulling the wiring a bit popping off a motor connector (thin stock wiring has enough room to allow wires to shift if loom pulled a bit) or same f*ckwit employee slapping together their guns too quickly as probably on piece work wages http://www.airsoft-forums.co.uk/index.php/topic/29400-g-g-combat-machine-aeg-cm16-sr-l-with-etu-issue/#entry226284 I know electronics & fets are not G&G's strong point in past but the above chap found a simple loose wire on motor hopefully similar issue perhaps ??? doubt if its a fuse - think fuse is between battery & mosfet so if mosfet is lighting up on each trigger pull then fuse & trigger sounds ok so just check connections to motor - if not motor connector - send it back could be a pulled wire from mosfet to motor but don't bother checking anything else just send it back if motor connectors are all sound Link to comment Share on other sites More sharing options...
JD8825 Posted January 30, 2016 Author Share Posted January 30, 2016 Thank you for your comments. I will check the motor connector. I was wondering if it could be that the battery I have are not powerful enough. Will report back. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 30, 2016 Supporters Share Posted January 30, 2016 a fully charged 8.4v should shift the gun just fine fresh off charge nimah's if left will slowly discharge - old nimah's lose their charge very quickly often dead in a day or two for old nimah's or new nimah's may lose charge in a week or two So if the battery is good sound order fresh off charge it should be fine could always use a testmeter to check voltage way post started it appeared that you might have 2 x 8.4v batteries - eg: 1 battery plus a spare so if you got 2 batteries I assumed both batteries couldn't be defective but you might be referring to both - as in the 2 sticks of ONE nunchuck battery so if you only have one battery - then you might wanna check somehow it works ok one of those cells could be duff ??? normally though you may hear motor struggling to turn over slowly as battery dies soz it is gonna be a couple of simple checks & process of elimination like most things when things don't quite work as expected but if battery ok - motor connector ok - send it back as it is new and should just work no hassle Link to comment Share on other sites More sharing options...
JD8825 Posted January 30, 2016 Author Share Posted January 30, 2016 The information is great. I talked to a mate who owns one an says that he runs a 9.6 in his an that the mosfet has a safety feature project it from against crap or low charge batteries? So I guess the two 8.4s are not good enough. I have had them for awhile now. Oh well guess I will need to buy new one lol. But before I do I will check the connectors an do what you recommended. Link to comment Share on other sites More sharing options...
n1ckh Posted January 31, 2016 Share Posted January 31, 2016 The information is great. I talked to a mate who owns one an says that he runs a 9.6 in his an that the mosfet has a safety feature project it from against crap or low charge batteries? So I guess the two 8.4s are not good enough. I have had them for awhile now. Oh well guess I will need to buy new one lol. But before I do I will check the connectors an do what you recommended.If your mate has the same weapon as you, use his battery before throwing yours away, if it works then you know it's the batterys I had 2x 8.4v batterys die after 6 months (they were more expensive than the cheap ones I bought from China) my other 3 have died after nearly 18 months so swapping to Lipo batterys now Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted January 31, 2016 Supporters Share Posted January 31, 2016 Agree... I can't see G&G limiting voltage either As over here a lot of us have switched to lipo but stayed at 7.4v rather than 11.1v. Plus I don't think G&G are that clever / stupid to do something like that. If 7.4v sounds a bit lame, I can assure a 25c 7.4v lipo packs quite a punch indeed, plus on 7.4v and a mental motor & gears you can hit 30rps or even 40rps on a DSG. We on here tend to use lipo as the old skool nimah's have their limits and do lose charge and even die -well I have found that. Too easy to go with the flow and buy nimah's stocked by Zero One etc.... Yes do not shove in 11.1v in a normal gun as it will burn out trigger contacts quickly But the SR-L, FFR, BOT have MOSFET in there so they are really lipo ready even 11.1v though I suggest keeping her at 7.4v which comes off charge at 8.4v to be exact Link to comment Share on other sites More sharing options...
JD8825 Posted February 1, 2016 Author Share Posted February 1, 2016 Thank you everyone for your advice. I think it is a battery issue. As after testing the 9.6v it works great. So I think it was the issue. Link to comment Share on other sites More sharing options...
JD8825 Posted February 1, 2016 Author Share Posted February 1, 2016 Thank you everyone for your advice. I think it is a battery issue. As after testing the 9.6v it works great. So I think it was the issue. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted February 1, 2016 Supporters Share Posted February 1, 2016 Cheers for update - happy shooting & all that Link to comment Share on other sites More sharing options...
MrPondlife Posted February 8, 2016 Share Posted February 8, 2016 I know this thread is basically closed but I had a similar issue this weekend with the same gun. Brand new, only tested in the garage. Worked fine for 1/2 days play then stopped. I thought it was the battery (7.4 lipo) so changed to fully charged Nim. Still nothing. Spoke to the gun tech who had a look at the motor connectors (as mentioned above) and one had come off. "whew" thought me...but nope wasn't it. Gun would fire for maybe 3 shots then stop. Mosfet was still flashing though. Tried 2 other battery's and exactly the same thing. Seems another player at the site with the same gun had exactly the same thing happen. It's behaving like there is a duff battery so stops. You disconnect the battery and it will fire for 3 to 5 shots then nothing. I hope it's the mosfet or the ETU. It's being sent back (along with the other guys) to Zeroone where we got them from this week. Will let you know what they find out. Gutted though as its a lovely bit of kit. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted February 8, 2016 Supporters Share Posted February 8, 2016 Damn..... soz to hear about all that - seems like G&G's R&D dept still has some reliability issues could be the ETU or the 3rd burst mosfet - not theyr'e strong point in the past But really thought the new release stuff was gonna be so much better than previous mosfet models Wish I had one so I could push it to death and see what is the achilles heal in these guns think ETU will either work 101% or not at all - sure they still use a cut off lever inside gearbox My feeling is Mosfet might be be blowing or overloaded as they cut corners before using cheaper quality basic mosfet units (but would of thought if it blows it should blow for good - so maybe ETU not resetting correctly - did it work on full auto ok) Their motors are a bit lame but even if a winding blew it would stay in this stuck dead point reguardless of battery connect/reconnect Yeah gotta be ETU or fet - BUT TWO GOING TITS UP - damn hope this ain't gonna be the start of guns failing over short time due to cut corners - again Link to comment Share on other sites More sharing options...
Ross49 Posted February 9, 2016 Share Posted February 9, 2016 Had a similar problem with mine cm16 srxl using 7.4v lipo would shoot for a bit then stop completely, disconnect the bat re connect and it worked for a bit then repeat. Took it back to store on Monday awaiting an out come. Link to comment Share on other sites More sharing options...
Supporters Lozart Posted February 9, 2016 Supporters Share Posted February 9, 2016 Pretty sure I read somewhere that G&G are now saying the ETU/Mosfet guns NEED an 11.1v LiPo to work properly... Link to comment Share on other sites More sharing options...
MrPondlife Posted February 9, 2016 Share Posted February 9, 2016 Pretty sure I read somewhere that G&G are now saying the ETU/Mosfet guns NEED an 11.1v LiPo to work properly... Interesting as I was told that by G&G and posted that on here here and was told 'nope 7.4 lipo would be fine'. I also asked a few sites selling the gun and they recommended 7.4s too However I tried my Nim as well (http://www.zerooneairsoft.com/advanced_search_result.php?keywords=ZOBAT9N) and it was the same results. I tried looking for 11.1v lipos to fit it and they were all too long. G&G sent me a recommendation but I can't find it anywhere Going to be annoyed if it is that as I now have 3 batteres that are potentially useless (just received another 7.4 that actually fits in the stock, 106mm long) Link to comment Share on other sites More sharing options...
Supporters Lozart Posted February 9, 2016 Supporters Share Posted February 9, 2016 Interesting as I was told that by G&G and posted that on here here and was told 'nope 7.4 lipo would be fine'. I also asked a few sites selling the gun and they recommended 7.4s too However I tried my Nim as well (http://www.zerooneairsoft.com/advanced_search_result.php?keywords=ZOBAT9N) and it was the same results. I tried looking for 11.1v lipos to fit it and they were all too long. G&G sent me a recommendation but I can't find it anywhere Going to be annoyed if it is that as I now have 3 batteres that are potentially useless (just received another 7.4 that actually fits in the stock, 106mm long) Problem is that a while back when G&G started fitting Mosfets and people used 11.1s with them they burned out and G&G said that they should only be used with 7.4s. Now they seem to be saying that the ETU models need more juice to work properly. Confusion reigns! Link to comment Share on other sites More sharing options...
MrPondlife Posted February 9, 2016 Share Posted February 9, 2016 You're not kidding! Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted February 9, 2016 Supporters Share Posted February 9, 2016 seems like G&G need to get their f*cking act together stop trying to reinvent the wheel also either the ETU isn't a wise replacement for old skool trigger or their fets are $hite - again What is the next excuse - people are using them too much with other brands of bb's the new ETU's are designed to work only with their G&G bb's ffs OK with the amount of stuff G&G shift you may get the odd lemon - but seems its getting too common now Bloody shame - coz still want a FFR2 but didn't realise the trigger & fet will need swapping out Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted February 9, 2016 Supporters Share Posted February 9, 2016 seems like G&G need to get their f*cking act together stop trying to reinvent the wheel also either the ETU isn't a wise replacement for old skool trigger or their fets are $hite - again What is the next excuse - people are using them too much with other brands of bb's the new ETU's are designed to work only with their G&G bb's ffs OK with the amount of stuff G&G shift you may get the odd lemon - but seems its getting too common now Bloody shame - coz still want a FFR2 but didn't realise the trigger & fet will need swapping out Dont mean to say I told you so but......... Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted February 9, 2016 Supporters Share Posted February 9, 2016 Their starter guns are OK... It's when they try other crap they come unstuck Their pbb box seems to be stopping or limiting what guns they go in. The new hog n predators seem to be STD box no pbb that may crack more than non pbb boxes Their higher end guns are hmmm so-so Even I wouldn't rush to spend £250+ on a G&G They was also developing a new kind of tappet plate or bb loading system away from conventional tappet & cam on sector gear but not seen that implemented though to be fair not looked or own the new G&G's I'll admit I had some reservations about their new technology when announced, but thought they had got it right now. After all it couldn't be any worse - spoke too soon The ETU unit is just a tarted up switch that I'm quite sure has cut off lever in. Now the problem is the simple switch is believe it or not quite hard to replicate for what it is. It has a number of possible states that is hard to replicate even with a set/reset latch circuit, you would think a basic flip-flops type set/reset latching circuit with a couple of transistors would do it... But there are a couple of states like semi stuck in dead zone that throw up possible qwirky scenarios that it don't work quite as expected.... I did look into an electronic circuit with NPN + PNP transistors myself but found this myself Others have used logic gates and 555 timer chip but again the odd situation arises where some states don't quite work as expected needing more circuity Or programmable chips like picaxe but they need voltage regulators as only 5v Max So the ETU unit if it works is quite clever but it may be the issue However given G&G's record with fet's plus the circuit reliability these 3 round switchable fet's may be the most likely cause as people say the led is blinking so ETU is working on maybe but fet is f*cked Wish I had FFR2 - cane the bitch to fail Then on a dud gun swap out the 3 rnd fet for a simple 3034 fet and it should just work Cane it some more to see if ETU has to have more volts But think this higher volts is bollox Yes the ETU could be use a 5v regulator but as long as volts stay at say 6v+ then the 7805 regulator will put out the expected 5v It is when input voltage drops to close to expected output voltage that the 5v starts going all weird. Maybe they will replace the 3rd fet with just a basic fet like in the BOT 300, personally a F-storm fet or AirLabs would be best and be done with it. £10 fet that is hard to beat and at the moment G&G's innovation is looking pretty damn $hit tbh Hope these owners get their guns sorted properly and soon Link to comment Share on other sites More sharing options...
MrPondlife Posted February 11, 2016 Share Posted February 11, 2016 Had a similar problem with mine cm16 srxl using 7.4v lipo would shoot for a bit then stop completely, disconnect the bat re connect and it worked for a bit then repeat. Took it back to store on Monday awaiting an out come. Any news on yours yet?? Link to comment Share on other sites More sharing options...
n1ckh Posted February 12, 2016 Share Posted February 12, 2016 When I installed my mosfet, after a while I would get intermittent firing. Took the gearbox apart & found the signal wire I soldered on had come off so cleaned it a bit more & resoldered & been fine since Link to comment Share on other sites More sharing options...
MrPondlife Posted February 12, 2016 Share Posted February 12, 2016 What battery are you running? Link to comment Share on other sites More sharing options...
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