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Blue light comes on, gun doesn't fire

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1 Blue light comes on, gun doesn't fire on Fri Feb 10, 2012 7:29 pm

Otter


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Private
Hey guys, so my gun was shooting fine for a while, but now it's doing this thing where the blue light comes on, but the gun will not fire. It makes a really high-pitched noise but the motor will not rotate. The high pitched noise sounds like just the normal electronic ringing noise, like what you hear when a crt monitor would turn on. I've cleaned the optical sensor and the two holes on the sector gear. Before it stopped firing at all, it was shooting 3 rounds on semi and full, and the motor would start to pull for a 4th shot, but then it would sound like a normal version 2 gearbox without the anti-reversal latch. My theory is that the ECU is toast- do you guys have any thoughts?

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2 Re: Blue light comes on, gun doesn't fire on Fri Feb 10, 2012 7:55 pm

Sunray


Major
Major
I'd have to agree with you, unless the gearbox has locked up which could also be the cause of the problem.

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3 Re: Blue light comes on, gun doesn't fire on Sat Feb 11, 2012 7:41 am

gycu


Sargeant
Sargeant
There are a few more possibilities, besides the ECU:

- the mosfets could be burned (imagine the active braking mosfet always on - the motor will always be forced to start and stop at the same time) - this often occurs with the heating the motor and making the sound you described, along with the smell of burned electronics (that comes between the motor collector and the brushes - this can damage the collector btw)
- this could be a motor problem only (not very likely but still possible): the brushes don't make a good contact with the collector, meaning you can have a broken brush spring, or the brushes may have worn out - you may need to change them

ps: tac has some very good and lasting custom brush springs at about 5$ or so - they are much stronger than original ctw/ptw ones..

Please keep us posted..

Cheers

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4 Re: Blue light comes on, gun doesn't fire on Sat Feb 11, 2012 7:56 pm

Otter


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Hmm. Okay. So I didn't smell any burning electronics, but it did sound like active breaking was not working. I'll check the brushes on the motor, I think I even have an extra set around here somewhere...

I can move the helical gear to the right of the sector gear, so I don't think that the gearbox is locked up.

How many parts are there to the ECU as a whole? 3? If so, how would I go about figuring out which part is dead?

Thanks guys! Oddly enough, these minor setbacks are kind of awesome. It's making me learn the ins and outs of this gun! Your help is awesome! cheers

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5 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 1:36 am

Otter


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A new turn of events! I took the grip off to change the brushes, etc. and decided to check the motor. I turned the coil manually a little bit and fired, and the gun cycled and stopped. I tried it again, and I could get a shot every few times I would manually spin it. I'm going to try to replace the brushes now, but does this mean that my motor is fried?

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6 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 1:59 am

CDR


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Private
Otter wrote:A new turn of events! I took the grip off to change the brushes, etc. and decided to check the motor. I turned the coil manually a little bit and fired, and the gun cycled and stopped. I tried it again, and I could get a shot every few times I would manually spin it. I'm going to try to replace the brushes now, but does this mean that my motor is fried?

if you change the brushes and it still does it, then yes ur motor is done.

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7 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 7:20 am

Sunray


Major
Major
Does sound like the motor Im afraid- all PTWs and CTWs have motor issues, just be thankful that a CTW motor is about £80 and a PTW's is about £190!!!!!
cheers

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8 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 7:43 am

gycu


Sargeant
Sargeant
The motor can be fixed but I recommend the tack mod.

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9 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 8:31 am

Sunray


Major
Major
How much is the Tack mod? Thinking about getting it done myself

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10 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 8:31 am

Sunray


Major
Major
How much is the Tack mod? Thinking about getting it done myself

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11 Re: Blue light comes on, gun doesn't fire on Sun Feb 12, 2012 10:07 am

Sunray wrote:How much is the Tack mod? Thinking about getting it done myself

Normally £90

http://www.systema-ptw.com/forum/viewtopic.php?f=48&t=3546

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